| 1 | |
| 2 | * linux/lib/vsprintf.c
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| 3 | *
|
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds
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| 5 |
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| 6 |
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| 7 |
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| 8 | |
| 9 | * Wirzenius wrote this portably, Torvalds fucked it up :-)
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| 10 |
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| 11 |
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| 12 | |
| 13 | * Fri Jul 13 2001 Crutcher Dunnavant <[email protected]>
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| 14 | * - changed to provide snprintf and vsnprintf functions
|
| 15 | * So Feb 1 16:51:32 CET 2004 Juergen Quade <[email protected]>
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| 16 | * - scnprintf and vscnprintf
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| 17 |
|
| 18 |
|
| 19 | #include <stdarg.h>
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| 20 | #include <linux/clk.h>
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| 21 | #include <linux/clk-provider.h>
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| 22 | #include <linux/module.h>
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| 23 | #include <linux/types.h>
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| 24 | #include <linux/string.h>
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| 25 | #include <linux/ctype.h>
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| 26 | #include <linux/kernel.h>
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| 27 | #include <linux/kallsyms.h>
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| 28 | #include <linux/math64.h>
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| 29 | #include <linux/uaccess.h>
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| 30 | #include <linux/ioport.h>
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| 31 | #include <linux/dcache.h>
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| 32 | #include <linux/cred.h>
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| 33 | #include <net/addrconf.h>
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| 34 |
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| 35 | #include <asm/page.h>
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| 36 | #include <asm/sections.h>
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| 37 | #include <asm/byteorder.h>
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| 38 |
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| 39 | #include <linux/string_helpers.h>
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| 40 | #include "kstrtox.h"
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| 41 |
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| 42 | |
| 43 | * simple_strtoull - convert a string to an unsigned long long
|
| 44 | * @cp: The start of the string
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| 45 | * @endp: A pointer to the end of the parsed string will be placed here
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| 46 | * @base: The number base to use
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| 47 | *
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| 48 | * This function is obsolete. Please use kstrtoull instead.
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| 49 |
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| 50 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
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| 51 | {
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| 52 | unsigned long long result;
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| 53 | unsigned int rv;
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| 54 |
|
| 55 | cp = _parse_integer_fixup_radix(cp, &base);
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| 56 | rv = _parse_integer(cp, base, &result);
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| 57 |
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| 58 | cp += (rv & ~KSTRTOX_OVERFLOW);
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| 59 |
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| 60 | if (endp)
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| 61 | *endp = (char *)cp;
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| 62 |
|
| 63 | return result;
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| 64 | }
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| 65 | EXPORT_SYMBOL(simple_strtoull);
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| 66 |
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| 67 | |
| 68 | * simple_strtoul - convert a string to an unsigned long
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| 69 | * @cp: The start of the string
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| 70 | * @endp: A pointer to the end of the parsed string will be placed here
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| 71 | * @base: The number base to use
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| 72 | *
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| 73 | * This function is obsolete. Please use kstrtoul instead.
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| 74 |
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| 75 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
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| 76 | {
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| 77 | return simple_strtoull(cp, endp, base);
|
| 78 | }
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| 79 | EXPORT_SYMBOL(simple_strtoul);
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| 80 |
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| 81 | |
| 82 | * simple_strtol - convert a string to a signed long
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| 83 | * @cp: The start of the string
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| 84 | * @endp: A pointer to the end of the parsed string will be placed here
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| 85 | * @base: The number base to use
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| 86 | *
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| 87 | * This function is obsolete. Please use kstrtol instead.
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| 88 |
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| 89 | long simple_strtol(const char *cp, char **endp, unsigned int base)
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| 90 | {
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| 91 | if (*cp == '-')
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| 92 | return -simple_strtoul(cp + 1, endp, base);
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| 93 |
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| 94 | return simple_strtoul(cp, endp, base);
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| 95 | }
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| 96 | EXPORT_SYMBOL(simple_strtol);
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| 97 |
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| 98 | |
| 99 | * simple_strtoll - convert a string to a signed long long
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| 100 | * @cp: The start of the string
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| 101 | * @endp: A pointer to the end of the parsed string will be placed here
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| 102 | * @base: The number base to use
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| 103 | *
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| 104 | * This function is obsolete. Please use kstrtoll instead.
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| 105 |
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| 106 | long long simple_strtoll(const char *cp, char **endp, unsigned int base)
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| 107 | {
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| 108 | if (*cp == '-')
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| 109 | return -simple_strtoull(cp + 1, endp, base);
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| 110 |
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| 111 | return simple_strtoull(cp, endp, base);
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| 112 | }
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| 113 | EXPORT_SYMBOL(simple_strtoll);
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| 114 |
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| 115 | static noinline_for_stack
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| 116 | int skip_atoi(const char **s)
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| 117 | {
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| 118 | int i = 0;
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| 119 |
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| 120 | do {
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| 121 | i = i*10 + *((*s)++) - '0';
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| 122 | } while (isdigit(**s));
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| 123 |
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| 124 | return i;
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| 125 | }
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| 126 |
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| 127 | |
| 128 | * Decimal conversion is by far the most typical, and is used for
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| 129 | * /proc and /sys data. This directly impacts e.g. top performance
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| 130 | * with many processes running. We optimize it for speed by emitting
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| 131 | * two characters at a time, using a 200 byte lookup table. This
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| 132 | * roughly halves the number of multiplications compared to computing
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| 133 | * the digits one at a time. Implementation strongly inspired by the
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| 134 | * previous version, which in turn used ideas described at
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| 135 | * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
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| 136 | * from the author, Douglas W. Jones).
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| 137 | *
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| 138 | * It turns out there is precisely one 26 bit fixed-point
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| 139 | * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
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| 140 | * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
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| 141 | * range happens to be somewhat larger (x <= 1073741898), but that's
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| 142 | * irrelevant for our purpose.
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| 143 | *
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| 144 | * For dividing a number in the range [10^4, 10^6-1] by 100, we still
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| 145 | * need a 32x32->64 bit multiply, so we simply use the same constant.
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| 146 | *
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| 147 | * For dividing a number in the range [100, 10^4-1] by 100, there are
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| 148 | * several options. The simplest is (x * 0x147b) >> 19, which is valid
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| 149 | * for all x <= 43698.
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| 150 |
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| 151 |
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| 152 | static const u16 decpair[100] = {
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| 153 | #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
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| 154 | _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
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| 155 | _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
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| 156 | _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
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| 157 | _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
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| 158 | _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
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| 159 | _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
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| 160 | _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
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| 161 | _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
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| 162 | _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
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| 163 | _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
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| 164 | #undef _
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| 165 | };
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| 166 |
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| 167 | |
| 168 | * This will print a single '0' even if r == 0, since we would
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| 169 | * immediately jump to out_r where two 0s would be written but only
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| 170 | * one of them accounted for in buf. This is needed by ip4_string
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| 171 | * below. All other callers pass a non-zero value of r.
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| 172 |
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| 173 | static noinline_for_stack
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| 174 | char *put_dec_trunc8(char *buf, unsigned r)
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| 175 | {
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| 176 | unsigned q;
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| 177 |
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| 178 |
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| 179 | if (r < 100)
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| 180 | goto out_r;
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| 181 |
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| 182 |
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| 183 | q = (r * (u64)0x28f5c29) >> 32;
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| 184 | *((u16 *)buf) = decpair[r - 100*q];
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| 185 | buf += 2;
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| 186 |
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| 187 |
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| 188 | if (q < 100)
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| 189 | goto out_q;
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| 190 |
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| 191 |
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| 192 | r = (q * (u64)0x28f5c29) >> 32;
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| 193 | *((u16 *)buf) = decpair[q - 100*r];
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| 194 | buf += 2;
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| 195 |
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| 196 |
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| 197 | if (r < 100)
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| 198 | goto out_r;
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| 199 |
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| 200 |
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| 201 | q = (r * 0x147b) >> 19;
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| 202 | *((u16 *)buf) = decpair[r - 100*q];
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| 203 | buf += 2;
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| 204 | out_q:
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| 205 |
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| 206 | r = q;
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| 207 | out_r:
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| 208 |
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| 209 | *((u16 *)buf) = decpair[r];
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| 210 | buf += r < 10 ? 1 : 2;
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| 211 | return buf;
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| 212 | }
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| 213 |
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| 214 | #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
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| 215 | static noinline_for_stack
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| 216 | char *put_dec_full8(char *buf, unsigned r)
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| 217 | {
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| 218 | unsigned q;
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| 219 |
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| 220 |
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| 221 | q = (r * (u64)0x28f5c29) >> 32;
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| 222 | *((u16 *)buf) = decpair[r - 100*q];
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| 223 | buf += 2;
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| 224 |
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| 225 |
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| 226 | r = (q * (u64)0x28f5c29) >> 32;
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| 227 | *((u16 *)buf) = decpair[q - 100*r];
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| 228 | buf += 2;
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| 229 |
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| 230 |
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| 231 | q = (r * 0x147b) >> 19;
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| 232 | *((u16 *)buf) = decpair[r - 100*q];
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| 233 | buf += 2;
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| 234 |
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| 235 |
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| 236 | *((u16 *)buf) = decpair[q];
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| 237 | buf += 2;
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| 238 | return buf;
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| 239 | }
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| 240 |
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| 241 | static noinline_for_stack
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| 242 | char *put_dec(char *buf, unsigned long long n)
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| 243 | {
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| 244 | if (n >= 100*1000*1000)
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| 245 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
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| 246 |
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| 247 | if (n >= 100*1000*1000)
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| 248 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
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| 249 |
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| 250 | return put_dec_trunc8(buf, n);
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| 251 | }
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| 252 |
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| 253 | #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
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| 254 |
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| 255 | static void
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| 256 | put_dec_full4(char *buf, unsigned r)
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| 257 | {
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| 258 | unsigned q;
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| 259 |
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| 260 |
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| 261 | q = (r * 0x147b) >> 19;
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| 262 | *((u16 *)buf) = decpair[r - 100*q];
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| 263 | buf += 2;
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| 264 |
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| 265 | *((u16 *)buf) = decpair[q];
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| 266 | }
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| 267 |
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| 268 | |
| 269 | * Call put_dec_full4 on x % 10000, return x / 10000.
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| 270 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43
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| 271 | * holds for all x < 1,128,869,999. The largest value this
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| 272 | * helper will ever be asked to convert is 1,125,520,955.
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| 273 | * (second call in the put_dec code, assuming n is all-ones).
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| 274 |
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| 275 | static noinline_for_stack
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| 276 | unsigned put_dec_helper4(char *buf, unsigned x)
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| 277 | {
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| 278 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
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| 279 |
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| 280 | put_dec_full4(buf, x - q * 10000);
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| 281 | return q;
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| 282 | }
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| 283 |
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| 284 | |
| 285 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
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| 286 | * (with permission from the author).
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| 287 | * Performs no 64-bit division and hence should be fast on 32-bit machines.
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| 288 |
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| 289 | static
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| 290 | char *put_dec(char *buf, unsigned long long n)
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| 291 | {
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| 292 | uint32_t d3, d2, d1, q, h;
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| 293 |
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| 294 | if (n < 100*1000*1000)
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| 295 | return put_dec_trunc8(buf, n);
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| 296 |
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| 297 | d1 = ((uint32_t)n >> 16);
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| 298 | h = (n >> 32);
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| 299 | d2 = (h ) & 0xffff;
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| 300 | d3 = (h >> 16);
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| 301 |
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| 302 | |
| 303 | = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0
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| 304 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
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| 305 | q = put_dec_helper4(buf, q);
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| 306 |
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| 307 | q += 7671 * d3 + 9496 * d2 + 6 * d1;
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| 308 | q = put_dec_helper4(buf+4, q);
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| 309 |
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| 310 | q += 4749 * d3 + 42 * d2;
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| 311 | q = put_dec_helper4(buf+8, q);
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| 312 |
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| 313 | q += 281 * d3;
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| 314 | buf += 12;
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| 315 | if (q)
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| 316 | buf = put_dec_trunc8(buf, q);
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| 317 | else while (buf[-1] == '0')
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| 318 | --buf;
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| 319 |
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| 320 | return buf;
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| 321 | }
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| 322 |
|
| 323 | #endif
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| 324 |
|
| 325 | |
| 326 | * Convert passed number to decimal string.
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| 327 | * Returns the length of string. On buffer overflow, returns 0.
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| 328 | *
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| 329 | * If speed is not important, use snprintf(). It's easy to read the code.
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| 330 |
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| 331 | int num_to_str(char *buf, int size, unsigned long long num)
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| 332 | {
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| 333 |
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| 334 | char tmp[sizeof(num) * 3] __aligned(2);
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| 335 | int idx, len;
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| 336 |
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| 337 |
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| 338 | if (num <= 9) {
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| 339 | tmp[0] = '0' + num;
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| 340 | len = 1;
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| 341 | } else {
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| 342 | len = put_dec(tmp, num) - tmp;
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| 343 | }
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| 344 |
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| 345 | if (len > size)
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| 346 | return 0;
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| 347 | for (idx = 0; idx < len; ++idx)
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| 348 | buf[idx] = tmp[len - idx - 1];
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| 349 | return len;
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| 350 | }
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| 351 |
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| 352 | #define SIGN 1
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| 353 | #define LEFT 2
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| 354 | #define PLUS 4
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| 355 | #define SPACE 8
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| 356 | #define ZEROPAD 16
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| 357 | #define SMALL 32
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| 358 | #define SPECIAL 64
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| 359 |
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| 360 | enum format_type {
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| 361 | FORMAT_TYPE_NONE,
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| 362 | FORMAT_TYPE_WIDTH,
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| 363 | FORMAT_TYPE_PRECISION,
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| 364 | FORMAT_TYPE_CHAR,
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| 365 | FORMAT_TYPE_STR,
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| 366 | FORMAT_TYPE_PTR,
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| 367 | FORMAT_TYPE_PERCENT_CHAR,
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| 368 | FORMAT_TYPE_INVALID,
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| 369 | FORMAT_TYPE_LONG_LONG,
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| 370 | FORMAT_TYPE_ULONG,
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| 371 | FORMAT_TYPE_LONG,
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| 372 | FORMAT_TYPE_UBYTE,
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| 373 | FORMAT_TYPE_BYTE,
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| 374 | FORMAT_TYPE_USHORT,
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| 375 | FORMAT_TYPE_SHORT,
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| 376 | FORMAT_TYPE_UINT,
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| 377 | FORMAT_TYPE_INT,
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| 378 | FORMAT_TYPE_SIZE_T,
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| 379 | FORMAT_TYPE_PTRDIFF
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| 380 | };
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| 381 |
|
| 382 | struct printf_spec {
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| 383 | u8 type;
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| 384 | u8 flags;
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| 385 | u8 base;
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| 386 | u8 qualifier;
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| 387 | s16 field_width;
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| 388 | s16 precision;
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| 389 | };
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| 390 |
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| 391 | static noinline_for_stack
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| 392 | char *number(char *buf, char *end, unsigned long long num,
|
| 393 | struct printf_spec spec)
|
| 394 | {
|
| 395 |
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| 396 | char tmp[3 * sizeof(num)] __aligned(2);
|
| 397 | char sign;
|
| 398 | char locase;
|
| 399 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
|
| 400 | int i;
|
| 401 | bool is_zero = num == 0LL;
|
| 402 |
|
| 403 | |
| 404 | * produces same digits or (maybe lowercased) letters
|
| 405 | locase = (spec.flags & SMALL);
|
| 406 | if (spec.flags & LEFT)
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| 407 | spec.flags &= ~ZEROPAD;
|
| 408 | sign = 0;
|
| 409 | if (spec.flags & SIGN) {
|
| 410 | if ((signed long long)num < 0) {
|
| 411 | sign = '-';
|
| 412 | num = -(signed long long)num;
|
| 413 | spec.field_width--;
|
| 414 | } else if (spec.flags & PLUS) {
|
| 415 | sign = '+';
|
| 416 | spec.field_width--;
|
| 417 | } else if (spec.flags & SPACE) {
|
| 418 | sign = ' ';
|
| 419 | spec.field_width--;
|
| 420 | }
|
| 421 | }
|
| 422 | if (need_pfx) {
|
| 423 | if (spec.base == 16)
|
| 424 | spec.field_width -= 2;
|
| 425 | else if (!is_zero)
|
| 426 | spec.field_width--;
|
| 427 | }
|
| 428 |
|
| 429 |
|
| 430 | i = 0;
|
| 431 | if (num < spec.base)
|
| 432 | tmp[i++] = hex_asc_upper[num] | locase;
|
| 433 | else if (spec.base != 10) {
|
| 434 | int mask = spec.base - 1;
|
| 435 | int shift = 3;
|
| 436 |
|
| 437 | if (spec.base == 16)
|
| 438 | shift = 4;
|
| 439 | do {
|
| 440 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase);
|
| 441 | num >>= shift;
|
| 442 | } while (num);
|
| 443 | } else {
|
| 444 | i = put_dec(tmp, num) - tmp;
|
| 445 | }
|
| 446 |
|
| 447 |
|
| 448 | if (i > spec.precision)
|
| 449 | spec.precision = i;
|
| 450 |
|
| 451 | spec.field_width -= spec.precision;
|
| 452 | if (!(spec.flags & (ZEROPAD | LEFT))) {
|
| 453 | while (--spec.field_width >= 0) {
|
| 454 | if (buf < end)
|
| 455 | *buf = ' ';
|
| 456 | ++buf;
|
| 457 | }
|
| 458 | }
|
| 459 |
|
| 460 | if (sign) {
|
| 461 | if (buf < end)
|
| 462 | *buf = sign;
|
| 463 | ++buf;
|
| 464 | }
|
| 465 |
|
| 466 | if (need_pfx) {
|
| 467 | if (spec.base == 16 || !is_zero) {
|
| 468 | if (buf < end)
|
| 469 | *buf = '0';
|
| 470 | ++buf;
|
| 471 | }
|
| 472 | if (spec.base == 16) {
|
| 473 | if (buf < end)
|
| 474 | *buf = ('X' | locase);
|
| 475 | ++buf;
|
| 476 | }
|
| 477 | }
|
| 478 |
|
| 479 | if (!(spec.flags & LEFT)) {
|
| 480 | char c = ' ' + (spec.flags & ZEROPAD);
|
| 481 | BUILD_BUG_ON(' ' + ZEROPAD != '0');
|
| 482 | while (--spec.field_width >= 0) {
|
| 483 | if (buf < end)
|
| 484 | *buf = c;
|
| 485 | ++buf;
|
| 486 | }
|
| 487 | }
|
| 488 |
|
| 489 | while (i <= --spec.precision) {
|
| 490 | if (buf < end)
|
| 491 | *buf = '0';
|
| 492 | ++buf;
|
| 493 | }
|
| 494 |
|
| 495 | while (--i >= 0) {
|
| 496 | if (buf < end)
|
| 497 | *buf = tmp[i];
|
| 498 | ++buf;
|
| 499 | }
|
| 500 |
|
| 501 | while (--spec.field_width >= 0) {
|
| 502 | if (buf < end)
|
| 503 | *buf = ' ';
|
| 504 | ++buf;
|
| 505 | }
|
| 506 |
|
| 507 | return buf;
|
| 508 | }
|
| 509 |
|
| 510 | static noinline_for_stack
|
| 511 | char *string(char *buf, char *end, const char *s, struct printf_spec spec)
|
| 512 | {
|
| 513 | int len, i;
|
| 514 |
|
| 515 | if ((unsigned long)s < PAGE_SIZE)
|
| 516 | s = "(null)";
|
| 517 |
|
| 518 | len = strnlen(s, spec.precision);
|
| 519 |
|
| 520 | if (!(spec.flags & LEFT)) {
|
| 521 | while (len < spec.field_width--) {
|
| 522 | if (buf < end)
|
| 523 | *buf = ' ';
|
| 524 | ++buf;
|
| 525 | }
|
| 526 | }
|
| 527 | for (i = 0; i < len; ++i) {
|
| 528 | if (buf < end)
|
| 529 | *buf = *s;
|
| 530 | ++buf; ++s;
|
| 531 | }
|
| 532 | while (len < spec.field_width--) {
|
| 533 | if (buf < end)
|
| 534 | *buf = ' ';
|
| 535 | ++buf;
|
| 536 | }
|
| 537 |
|
| 538 | return buf;
|
| 539 | }
|
| 540 |
|
| 541 | static void widen(char *buf, char *end, unsigned len, unsigned spaces)
|
| 542 | {
|
| 543 | size_t size;
|
| 544 | if (buf >= end)
|
| 545 | return;
|
| 546 | size = end - buf;
|
| 547 | if (size <= spaces) {
|
| 548 | memset(buf, ' ', size);
|
| 549 | return;
|
| 550 | }
|
| 551 | if (len) {
|
| 552 | if (len > size - spaces)
|
| 553 | len = size - spaces;
|
| 554 | memmove(buf + spaces, buf, len);
|
| 555 | }
|
| 556 | memset(buf, ' ', spaces);
|
| 557 | }
|
| 558 |
|
| 559 | static noinline_for_stack
|
| 560 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
|
| 561 | const char *fmt)
|
| 562 | {
|
| 563 | const char *array[4], *s;
|
| 564 | const struct dentry *p;
|
| 565 | int depth;
|
| 566 | int i, n;
|
| 567 |
|
| 568 | switch (fmt[1]) {
|
| 569 | case '2': case '3': case '4':
|
| 570 | depth = fmt[1] - '0';
|
| 571 | break;
|
| 572 | default:
|
| 573 | depth = 1;
|
| 574 | }
|
| 575 |
|
| 576 | rcu_read_lock();
|
| 577 | for (i = 0; i < depth; i++, d = p) {
|
| 578 | p = ACCESS_ONCE(d->d_parent);
|
| 579 | array[i] = ACCESS_ONCE(d->d_name.name);
|
| 580 | if (p == d) {
|
| 581 | if (i)
|
| 582 | array[i] = "";
|
| 583 | i++;
|
| 584 | break;
|
| 585 | }
|
| 586 | }
|
| 587 | s = array[--i];
|
| 588 | for (n = 0; n != spec.precision; n++, buf++) {
|
| 589 | char c = *s++;
|
| 590 | if (!c) {
|
| 591 | if (!i)
|
| 592 | break;
|
| 593 | c = '/';
|
| 594 | s = array[--i];
|
| 595 | }
|
| 596 | if (buf < end)
|
| 597 | *buf = c;
|
| 598 | }
|
| 599 | rcu_read_unlock();
|
| 600 | if (n < spec.field_width) {
|
| 601 |
|
| 602 | unsigned spaces = spec.field_width - n;
|
| 603 | if (!(spec.flags & LEFT)) {
|
| 604 | widen(buf - n, end, n, spaces);
|
| 605 | return buf + spaces;
|
| 606 | }
|
| 607 | while (spaces--) {
|
| 608 | if (buf < end)
|
| 609 | *buf = ' ';
|
| 610 | ++buf;
|
| 611 | }
|
| 612 | }
|
| 613 | return buf;
|
| 614 | }
|
| 615 |
|
| 616 | static noinline_for_stack
|
| 617 | char *symbol_string(char *buf, char *end, void *ptr,
|
| 618 | struct printf_spec spec, const char *fmt)
|
| 619 | {
|
| 620 | unsigned long value;
|
| 621 | #ifdef CONFIG_KALLSYMS
|
| 622 | char sym[KSYM_SYMBOL_LEN];
|
| 623 | #endif
|
| 624 |
|
| 625 | if (fmt[1] == 'R')
|
| 626 | ptr = __builtin_extract_return_addr(ptr);
|
| 627 | value = (unsigned long)ptr;
|
| 628 |
|
| 629 | #ifdef CONFIG_KALLSYMS
|
| 630 | if (*fmt == 'B')
|
| 631 | sprint_backtrace(sym, value);
|
| 632 | else if (*fmt != 'f' && *fmt != 's')
|
| 633 | sprint_symbol(sym, value);
|
| 634 | else
|
| 635 | sprint_symbol_no_offset(sym, value);
|
| 636 |
|
| 637 | return string(buf, end, sym, spec);
|
| 638 | #else
|
| 639 | spec.field_width = 2 * sizeof(void *);
|
| 640 | spec.flags |= SPECIAL | SMALL | ZEROPAD;
|
| 641 | spec.base = 16;
|
| 642 |
|
| 643 | return number(buf, end, value, spec);
|
| 644 | #endif
|
| 645 | }
|
| 646 |
|
| 647 | static noinline_for_stack
|
| 648 | char *resource_string(char *buf, char *end, struct resource *res,
|
| 649 | struct printf_spec spec, const char *fmt)
|
| 650 | {
|
| 651 | #ifndef IO_RSRC_PRINTK_SIZE
|
| 652 | #define IO_RSRC_PRINTK_SIZE 6
|
| 653 | #endif
|
| 654 |
|
| 655 | #ifndef MEM_RSRC_PRINTK_SIZE
|
| 656 | #define MEM_RSRC_PRINTK_SIZE 10
|
| 657 | #endif
|
| 658 | static const struct printf_spec io_spec = {
|
| 659 | .base = 16,
|
| 660 | .field_width = IO_RSRC_PRINTK_SIZE,
|
| 661 | .precision = -1,
|
| 662 | .flags = SPECIAL | SMALL | ZEROPAD,
|
| 663 | };
|
| 664 | static const struct printf_spec mem_spec = {
|
| 665 | .base = 16,
|
| 666 | .field_width = MEM_RSRC_PRINTK_SIZE,
|
| 667 | .precision = -1,
|
| 668 | .flags = SPECIAL | SMALL | ZEROPAD,
|
| 669 | };
|
| 670 | static const struct printf_spec bus_spec = {
|
| 671 | .base = 16,
|
| 672 | .field_width = 2,
|
| 673 | .precision = -1,
|
| 674 | .flags = SMALL | ZEROPAD,
|
| 675 | };
|
| 676 | static const struct printf_spec dec_spec = {
|
| 677 | .base = 10,
|
| 678 | .precision = -1,
|
| 679 | .flags = 0,
|
| 680 | };
|
| 681 | static const struct printf_spec str_spec = {
|
| 682 | .field_width = -1,
|
| 683 | .precision = 10,
|
| 684 | .flags = LEFT,
|
| 685 | };
|
| 686 | static const struct printf_spec flag_spec = {
|
| 687 | .base = 16,
|
| 688 | .precision = -1,
|
| 689 | .flags = SPECIAL | SMALL,
|
| 690 | };
|
| 691 |
|
| 692 | |
| 693 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16)
|
| 694 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
|
| 695 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
|
| 696 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
|
| 697 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
|
| 698 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
|
| 699 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
|
| 700 |
|
| 701 | char *p = sym, *pend = sym + sizeof(sym);
|
| 702 | int decode = (fmt[0] == 'R') ? 1 : 0;
|
| 703 | const struct printf_spec *specp;
|
| 704 |
|
| 705 | *p++ = '[';
|
| 706 | if (res->flags & IORESOURCE_IO) {
|
| 707 | p = string(p, pend, "io ", str_spec);
|
| 708 | specp = &io_spec;
|
| 709 | } else if (res->flags & IORESOURCE_MEM) {
|
| 710 | p = string(p, pend, "mem ", str_spec);
|
| 711 | specp = &mem_spec;
|
| 712 | } else if (res->flags & IORESOURCE_IRQ) {
|
| 713 | p = string(p, pend, "irq ", str_spec);
|
| 714 | specp = &dec_spec;
|
| 715 | } else if (res->flags & IORESOURCE_DMA) {
|
| 716 | p = string(p, pend, "dma ", str_spec);
|
| 717 | specp = &dec_spec;
|
| 718 | } else if (res->flags & IORESOURCE_BUS) {
|
| 719 | p = string(p, pend, "bus ", str_spec);
|
| 720 | specp = &bus_spec;
|
| 721 | } else {
|
| 722 | p = string(p, pend, "??? ", str_spec);
|
| 723 | specp = &mem_spec;
|
| 724 | decode = 0;
|
| 725 | }
|
| 726 | if (decode && res->flags & IORESOURCE_UNSET) {
|
| 727 | p = string(p, pend, "size ", str_spec);
|
| 728 | p = number(p, pend, resource_size(res), *specp);
|
| 729 | } else {
|
| 730 | p = number(p, pend, res->start, *specp);
|
| 731 | if (res->start != res->end) {
|
| 732 | *p++ = '-';
|
| 733 | p = number(p, pend, res->end, *specp);
|
| 734 | }
|
| 735 | }
|
| 736 | if (decode) {
|
| 737 | if (res->flags & IORESOURCE_MEM_64)
|
| 738 | p = string(p, pend, " 64bit", str_spec);
|
| 739 | if (res->flags & IORESOURCE_PREFETCH)
|
| 740 | p = string(p, pend, " pref", str_spec);
|
| 741 | if (res->flags & IORESOURCE_WINDOW)
|
| 742 | p = string(p, pend, " window", str_spec);
|
| 743 | if (res->flags & IORESOURCE_DISABLED)
|
| 744 | p = string(p, pend, " disabled", str_spec);
|
| 745 | } else {
|
| 746 | p = string(p, pend, " flags ", str_spec);
|
| 747 | p = number(p, pend, res->flags, flag_spec);
|
| 748 | }
|
| 749 | *p++ = ']';
|
| 750 | *p = '\0';
|
| 751 |
|
| 752 | return string(buf, end, sym, spec);
|
| 753 | }
|
| 754 |
|
| 755 | static noinline_for_stack
|
| 756 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
|
| 757 | const char *fmt)
|
| 758 | {
|
| 759 | int i, len = 1; |
| 760 | negative value, fallback to the default
|
| 761 | char separator;
|
| 762 |
|
| 763 | if (spec.field_width == 0)
|
| 764 |
|
| 765 | return buf;
|
| 766 |
|
| 767 | if (ZERO_OR_NULL_PTR(addr))
|
| 768 |
|
| 769 | return string(buf, end, NULL, spec);
|
| 770 |
|
| 771 | switch (fmt[1]) {
|
| 772 | case 'C':
|
| 773 | separator = ':';
|
| 774 | break;
|
| 775 | case 'D':
|
| 776 | separator = '-';
|
| 777 | break;
|
| 778 | case 'N':
|
| 779 | separator = 0;
|
| 780 | break;
|
| 781 | default:
|
| 782 | separator = ' ';
|
| 783 | break;
|
| 784 | }
|
| 785 |
|
| 786 | if (spec.field_width > 0)
|
| 787 | len = min_t(int, spec.field_width, 64);
|
| 788 |
|
| 789 | for (i = 0; i < len; ++i) {
|
| 790 | if (buf < end)
|
| 791 | *buf = hex_asc_hi(addr[i]);
|
| 792 | ++buf;
|
| 793 | if (buf < end)
|
| 794 | *buf = hex_asc_lo(addr[i]);
|
| 795 | ++buf;
|
| 796 |
|
| 797 | if (separator && i != len - 1) {
|
| 798 | if (buf < end)
|
| 799 | *buf = separator;
|
| 800 | ++buf;
|
| 801 | }
|
| 802 | }
|
| 803 |
|
| 804 | return buf;
|
| 805 | }
|
| 806 |
|
| 807 | static noinline_for_stack
|
| 808 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap,
|
| 809 | struct printf_spec spec, const char *fmt)
|
| 810 | {
|
| 811 | const int CHUNKSZ = 32;
|
| 812 | int nr_bits = max_t(int, spec.field_width, 0);
|
| 813 | int i, chunksz;
|
| 814 | bool first = true;
|
| 815 |
|
| 816 |
|
| 817 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 };
|
| 818 |
|
| 819 | chunksz = nr_bits & (CHUNKSZ - 1);
|
| 820 | if (chunksz == 0)
|
| 821 | chunksz = CHUNKSZ;
|
| 822 |
|
| 823 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ;
|
| 824 | for (; i >= 0; i -= CHUNKSZ) {
|
| 825 | u32 chunkmask, val;
|
| 826 | int word, bit;
|
| 827 |
|
| 828 | chunkmask = ((1ULL << chunksz) - 1);
|
| 829 | word = i / BITS_PER_LONG;
|
| 830 | bit = i % BITS_PER_LONG;
|
| 831 | val = (bitmap[word] >> bit) & chunkmask;
|
| 832 |
|
| 833 | if (!first) {
|
| 834 | if (buf < end)
|
| 835 | *buf = ',';
|
| 836 | buf++;
|
| 837 | }
|
| 838 | first = false;
|
| 839 |
|
| 840 | spec.field_width = DIV_ROUND_UP(chunksz, 4);
|
| 841 | buf = number(buf, end, val, spec);
|
| 842 |
|
| 843 | chunksz = CHUNKSZ;
|
| 844 | }
|
| 845 | return buf;
|
| 846 | }
|
| 847 |
|
| 848 | static noinline_for_stack
|
| 849 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap,
|
| 850 | struct printf_spec spec, const char *fmt)
|
| 851 | {
|
| 852 | int nr_bits = max_t(int, spec.field_width, 0);
|
| 853 |
|
| 854 | int cur, rbot, rtop;
|
| 855 | bool first = true;
|
| 856 |
|
| 857 |
|
| 858 | spec = (struct printf_spec){ .base = 10 };
|
| 859 |
|
| 860 | rbot = cur = find_first_bit(bitmap, nr_bits);
|
| 861 | while (cur < nr_bits) {
|
| 862 | rtop = cur;
|
| 863 | cur = find_next_bit(bitmap, nr_bits, cur + 1);
|
| 864 | if (cur < nr_bits && cur <= rtop + 1)
|
| 865 | continue;
|
| 866 |
|
| 867 | if (!first) {
|
| 868 | if (buf < end)
|
| 869 | *buf = ',';
|
| 870 | buf++;
|
| 871 | }
|
| 872 | first = false;
|
| 873 |
|
| 874 | buf = number(buf, end, rbot, spec);
|
| 875 | if (rbot < rtop) {
|
| 876 | if (buf < end)
|
| 877 | *buf = '-';
|
| 878 | buf++;
|
| 879 |
|
| 880 | buf = number(buf, end, rtop, spec);
|
| 881 | }
|
| 882 |
|
| 883 | rbot = cur;
|
| 884 | }
|
| 885 | return buf;
|
| 886 | }
|
| 887 |
|
| 888 | static noinline_for_stack
|
| 889 | char *mac_address_string(char *buf, char *end, u8 *addr,
|
| 890 | struct printf_spec spec, const char *fmt)
|
| 891 | {
|
| 892 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
|
| 893 | char *p = mac_addr;
|
| 894 | int i;
|
| 895 | char separator;
|
| 896 | bool reversed = false;
|
| 897 |
|
| 898 | switch (fmt[1]) {
|
| 899 | case 'F':
|
| 900 | separator = '-';
|
| 901 | break;
|
| 902 |
|
| 903 | case 'R':
|
| 904 | reversed = true;
|
| 905 |
|
| 906 |
|
| 907 | default:
|
| 908 | separator = ':';
|
| 909 | break;
|
| 910 | }
|
| 911 |
|
| 912 | for (i = 0; i < 6; i++) {
|
| 913 | if (reversed)
|
| 914 | p = hex_byte_pack(p, addr[5 - i]);
|
| 915 | else
|
| 916 | p = hex_byte_pack(p, addr[i]);
|
| 917 |
|
| 918 | if (fmt[0] == 'M' && i != 5)
|
| 919 | *p++ = separator;
|
| 920 | }
|
| 921 | *p = '\0';
|
| 922 |
|
| 923 | return string(buf, end, mac_addr, spec);
|
| 924 | }
|
| 925 |
|
| 926 | static noinline_for_stack
|
| 927 | char *ip4_string(char *p, const u8 *addr, const char *fmt)
|
| 928 | {
|
| 929 | int i;
|
| 930 | bool leading_zeros = (fmt[0] == 'i');
|
| 931 | int index;
|
| 932 | int step;
|
| 933 |
|
| 934 | switch (fmt[2]) {
|
| 935 | case 'h':
|
| 936 | #ifdef __BIG_ENDIAN
|
| 937 | index = 0;
|
| 938 | step = 1;
|
| 939 | #else
|
| 940 | index = 3;
|
| 941 | step = -1;
|
| 942 | #endif
|
| 943 | break;
|
| 944 | case 'l':
|
| 945 | index = 3;
|
| 946 | step = -1;
|
| 947 | break;
|
| 948 | case 'n':
|
| 949 | case 'b':
|
| 950 | default:
|
| 951 | index = 0;
|
| 952 | step = 1;
|
| 953 | break;
|
| 954 | }
|
| 955 | for (i = 0; i < 4; i++) {
|
| 956 | char temp[4] __aligned(2);
|
| 957 | int digits = put_dec_trunc8(temp, addr[index]) - temp;
|
| 958 | if (leading_zeros) {
|
| 959 | if (digits < 3)
|
| 960 | *p++ = '0';
|
| 961 | if (digits < 2)
|
| 962 | *p++ = '0';
|
| 963 | }
|
| 964 |
|
| 965 | while (digits--)
|
| 966 | *p++ = temp[digits];
|
| 967 | if (i < 3)
|
| 968 | *p++ = '.';
|
| 969 | index += step;
|
| 970 | }
|
| 971 | *p = '\0';
|
| 972 |
|
| 973 | return p;
|
| 974 | }
|
| 975 |
|
| 976 | static noinline_for_stack
|
| 977 | char *ip6_compressed_string(char *p, const char *addr)
|
| 978 | {
|
| 979 | int i, j, range;
|
| 980 | unsigned char zerolength[8];
|
| 981 | int longest = 1;
|
| 982 | int colonpos = -1;
|
| 983 | u16 word;
|
| 984 | u8 hi, lo;
|
| 985 | bool needcolon = false;
|
| 986 | bool useIPv4;
|
| 987 | struct in6_addr in6;
|
| 988 |
|
| 989 | memcpy(&in6, addr, sizeof(struct in6_addr));
|
| 990 |
|
| 991 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
|
| 992 |
|
| 993 | memset(zerolength, 0, sizeof(zerolength));
|
| 994 |
|
| 995 | if (useIPv4)
|
| 996 | range = 6;
|
| 997 | else
|
| 998 | range = 8;
|
| 999 |
|
| 1000 |
|
| 1001 | for (i = 0; i < range; i++) {
|
| 1002 | for (j = i; j < range; j++) {
|
| 1003 | if (in6.s6_addr16[j] != 0)
|
| 1004 | break;
|
| 1005 | zerolength[i]++;
|
| 1006 | }
|
| 1007 | }
|
| 1008 | for (i = 0; i < range; i++) {
|
| 1009 | if (zerolength[i] > longest) {
|
| 1010 | longest = zerolength[i];
|
| 1011 | colonpos = i;
|
| 1012 | }
|
| 1013 | }
|
| 1014 | if (longest == 1)
|
| 1015 | colonpos = -1;
|
| 1016 |
|
| 1017 |
|
| 1018 | for (i = 0; i < range; i++) {
|
| 1019 | if (i == colonpos) {
|
| 1020 | if (needcolon || i == 0)
|
| 1021 | *p++ = ':';
|
| 1022 | *p++ = ':';
|
| 1023 | needcolon = false;
|
| 1024 | i += longest - 1;
|
| 1025 | continue;
|
| 1026 | }
|
| 1027 | if (needcolon) {
|
| 1028 | *p++ = ':';
|
| 1029 | needcolon = false;
|
| 1030 | }
|
| 1031 |
|
| 1032 | word = ntohs(in6.s6_addr16[i]);
|
| 1033 | hi = word >> 8;
|
| 1034 | lo = word & 0xff;
|
| 1035 | if (hi) {
|
| 1036 | if (hi > 0x0f)
|
| 1037 | p = hex_byte_pack(p, hi);
|
| 1038 | else
|
| 1039 | *p++ = hex_asc_lo(hi);
|
| 1040 | p = hex_byte_pack(p, lo);
|
| 1041 | }
|
| 1042 | else if (lo > 0x0f)
|
| 1043 | p = hex_byte_pack(p, lo);
|
| 1044 | else
|
| 1045 | *p++ = hex_asc_lo(lo);
|
| 1046 | needcolon = true;
|
| 1047 | }
|
| 1048 |
|
| 1049 | if (useIPv4) {
|
| 1050 | if (needcolon)
|
| 1051 | *p++ = ':';
|
| 1052 | p = ip4_string(p, &in6.s6_addr[12], "I4");
|
| 1053 | }
|
| 1054 | *p = '\0';
|
| 1055 |
|
| 1056 | return p;
|
| 1057 | }
|
| 1058 |
|
| 1059 | static noinline_for_stack
|
| 1060 | char *ip6_string(char *p, const char *addr, const char *fmt)
|
| 1061 | {
|
| 1062 | int i;
|
| 1063 |
|
| 1064 | for (i = 0; i < 8; i++) {
|
| 1065 | p = hex_byte_pack(p, *addr++);
|
| 1066 | p = hex_byte_pack(p, *addr++);
|
| 1067 | if (fmt[0] == 'I' && i != 7)
|
| 1068 | *p++ = ':';
|
| 1069 | }
|
| 1070 | *p = '\0';
|
| 1071 |
|
| 1072 | return p;
|
| 1073 | }
|
| 1074 |
|
| 1075 | static noinline_for_stack
|
| 1076 | char *ip6_addr_string(char *buf, char *end, const u8 *addr,
|
| 1077 | struct printf_spec spec, const char *fmt)
|
| 1078 | {
|
| 1079 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
|
| 1080 |
|
| 1081 | if (fmt[0] == 'I' && fmt[2] == 'c')
|
| 1082 | ip6_compressed_string(ip6_addr, addr);
|
| 1083 | else
|
| 1084 | ip6_string(ip6_addr, addr, fmt);
|
| 1085 |
|
| 1086 | return string(buf, end, ip6_addr, spec);
|
| 1087 | }
|
| 1088 |
|
| 1089 | static noinline_for_stack
|
| 1090 | char *ip4_addr_string(char *buf, char *end, const u8 *addr,
|
| 1091 | struct printf_spec spec, const char *fmt)
|
| 1092 | {
|
| 1093 | char ip4_addr[sizeof("255.255.255.255")];
|
| 1094 |
|
| 1095 | ip4_string(ip4_addr, addr, fmt);
|
| 1096 |
|
| 1097 | return string(buf, end, ip4_addr, spec);
|
| 1098 | }
|
| 1099 |
|
| 1100 | static noinline_for_stack
|
| 1101 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
|
| 1102 | struct printf_spec spec, const char *fmt)
|
| 1103 | {
|
| 1104 | bool have_p = false, have_s = false, have_f = false, have_c = false;
|
| 1105 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
|
| 1106 | sizeof(":12345") + sizeof("/123456789") +
|
| 1107 | sizeof("%1234567890")];
|
| 1108 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
|
| 1109 | const u8 *addr = (const u8 *) &sa->sin6_addr;
|
| 1110 | char fmt6[2] = { fmt[0], '6' };
|
| 1111 | u8 off = 0;
|
| 1112 |
|
| 1113 | fmt++;
|
| 1114 | while (isalpha(*++fmt)) {
|
| 1115 | switch (*fmt) {
|
| 1116 | case 'p':
|
| 1117 | have_p = true;
|
| 1118 | break;
|
| 1119 | case 'f':
|
| 1120 | have_f = true;
|
| 1121 | break;
|
| 1122 | case 's':
|
| 1123 | have_s = true;
|
| 1124 | break;
|
| 1125 | case 'c':
|
| 1126 | have_c = true;
|
| 1127 | break;
|
| 1128 | }
|
| 1129 | }
|
| 1130 |
|
| 1131 | if (have_p || have_s || have_f) {
|
| 1132 | *p = '[';
|
| 1133 | off = 1;
|
| 1134 | }
|
| 1135 |
|
| 1136 | if (fmt6[0] == 'I' && have_c)
|
| 1137 | p = ip6_compressed_string(ip6_addr + off, addr);
|
| 1138 | else
|
| 1139 | p = ip6_string(ip6_addr + off, addr, fmt6);
|
| 1140 |
|
| 1141 | if (have_p || have_s || have_f)
|
| 1142 | *p++ = ']';
|
| 1143 |
|
| 1144 | if (have_p) {
|
| 1145 | *p++ = ':';
|
| 1146 | p = number(p, pend, ntohs(sa->sin6_port), spec);
|
| 1147 | }
|
| 1148 | if (have_f) {
|
| 1149 | *p++ = '/';
|
| 1150 | p = number(p, pend, ntohl(sa->sin6_flowinfo &
|
| 1151 | IPV6_FLOWINFO_MASK), spec);
|
| 1152 | }
|
| 1153 | if (have_s) {
|
| 1154 | *p++ = '%';
|
| 1155 | p = number(p, pend, sa->sin6_scope_id, spec);
|
| 1156 | }
|
| 1157 | *p = '\0';
|
| 1158 |
|
| 1159 | return string(buf, end, ip6_addr, spec);
|
| 1160 | }
|
| 1161 |
|
| 1162 | static noinline_for_stack
|
| 1163 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
|
| 1164 | struct printf_spec spec, const char *fmt)
|
| 1165 | {
|
| 1166 | bool have_p = false;
|
| 1167 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
|
| 1168 | char *pend = ip4_addr + sizeof(ip4_addr);
|
| 1169 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
|
| 1170 | char fmt4[3] = { fmt[0], '4', 0 };
|
| 1171 |
|
| 1172 | fmt++;
|
| 1173 | while (isalpha(*++fmt)) {
|
| 1174 | switch (*fmt) {
|
| 1175 | case 'p':
|
| 1176 | have_p = true;
|
| 1177 | break;
|
| 1178 | case 'h':
|
| 1179 | case 'l':
|
| 1180 | case 'n':
|
| 1181 | case 'b':
|
| 1182 | fmt4[2] = *fmt;
|
| 1183 | break;
|
| 1184 | }
|
| 1185 | }
|
| 1186 |
|
| 1187 | p = ip4_string(ip4_addr, addr, fmt4);
|
| 1188 | if (have_p) {
|
| 1189 | *p++ = ':';
|
| 1190 | p = number(p, pend, ntohs(sa->sin_port), spec);
|
| 1191 | }
|
| 1192 | *p = '\0';
|
| 1193 |
|
| 1194 | return string(buf, end, ip4_addr, spec);
|
| 1195 | }
|
| 1196 |
|
| 1197 | static noinline_for_stack
|
| 1198 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
|
| 1199 | const char *fmt)
|
| 1200 | {
|
| 1201 | bool found = true;
|
| 1202 | int count = 1;
|
| 1203 | unsigned int flags = 0;
|
| 1204 | int len;
|
| 1205 |
|
| 1206 | if (spec.field_width == 0)
|
| 1207 | return buf;
|
| 1208 |
|
| 1209 | if (ZERO_OR_NULL_PTR(addr))
|
| 1210 | return string(buf, end, NULL, spec);
|
| 1211 |
|
| 1212 |
|
| 1213 | do {
|
| 1214 | switch (fmt[count++]) {
|
| 1215 | case 'a':
|
| 1216 | flags |= ESCAPE_ANY;
|
| 1217 | break;
|
| 1218 | case 'c':
|
| 1219 | flags |= ESCAPE_SPECIAL;
|
| 1220 | break;
|
| 1221 | case 'h':
|
| 1222 | flags |= ESCAPE_HEX;
|
| 1223 | break;
|
| 1224 | case 'n':
|
| 1225 | flags |= ESCAPE_NULL;
|
| 1226 | break;
|
| 1227 | case 'o':
|
| 1228 | flags |= ESCAPE_OCTAL;
|
| 1229 | break;
|
| 1230 | case 'p':
|
| 1231 | flags |= ESCAPE_NP;
|
| 1232 | break;
|
| 1233 | case 's':
|
| 1234 | flags |= ESCAPE_SPACE;
|
| 1235 | break;
|
| 1236 | default:
|
| 1237 | found = false;
|
| 1238 | break;
|
| 1239 | }
|
| 1240 | } while (found);
|
| 1241 |
|
| 1242 | if (!flags)
|
| 1243 | flags = ESCAPE_ANY_NP;
|
| 1244 |
|
| 1245 | len = spec.field_width < 0 ? 1 : spec.field_width;
|
| 1246 |
|
| 1247 | |
| 1248 | * string_escape_mem() writes as many characters as it can to
|
| 1249 | * the given buffer, and returns the total size of the output
|
| 1250 | * had the buffer been big enough.
|
| 1251 |
|
| 1252 | buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL);
|
| 1253 |
|
| 1254 | return buf;
|
| 1255 | }
|
| 1256 |
|
| 1257 | static noinline_for_stack
|
| 1258 | char *uuid_string(char *buf, char *end, const u8 *addr,
|
| 1259 | struct printf_spec spec, const char *fmt)
|
| 1260 | {
|
| 1261 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
|
| 1262 | char *p = uuid;
|
| 1263 | int i;
|
| 1264 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
|
| 1265 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
|
| 1266 | const u8 *index = be;
|
| 1267 | bool uc = false;
|
| 1268 |
|
| 1269 | switch (*(++fmt)) {
|
| 1270 | case 'L':
|
| 1271 | uc = true;
|
| 1272 | case 'l':
|
| 1273 | index = le;
|
| 1274 | break;
|
| 1275 | case 'B':
|
| 1276 | uc = true;
|
| 1277 | break;
|
| 1278 | }
|
| 1279 |
|
| 1280 | for (i = 0; i < 16; i++) {
|
| 1281 | p = hex_byte_pack(p, addr[index[i]]);
|
| 1282 | switch (i) {
|
| 1283 | case 3:
|
| 1284 | case 5:
|
| 1285 | case 7:
|
| 1286 | case 9:
|
| 1287 | *p++ = '-';
|
| 1288 | break;
|
| 1289 | }
|
| 1290 | }
|
| 1291 |
|
| 1292 | *p = 0;
|
| 1293 |
|
| 1294 | if (uc) {
|
| 1295 | p = uuid;
|
| 1296 | do {
|
| 1297 | *p = toupper(*p);
|
| 1298 | } while (*(++p));
|
| 1299 | }
|
| 1300 |
|
| 1301 | return string(buf, end, uuid, spec);
|
| 1302 | }
|
| 1303 |
|
| 1304 | static
|
| 1305 | char *netdev_feature_string(char *buf, char *end, const u8 *addr,
|
| 1306 | struct printf_spec spec)
|
| 1307 | {
|
| 1308 | spec.flags |= SPECIAL | SMALL | ZEROPAD;
|
| 1309 | if (spec.field_width == -1)
|
| 1310 | spec.field_width = 2 + 2 * sizeof(netdev_features_t);
|
| 1311 | spec.base = 16;
|
| 1312 |
|
| 1313 | return number(buf, end, *(const netdev_features_t *)addr, spec);
|
| 1314 | }
|
| 1315 |
|
| 1316 | static noinline_for_stack
|
| 1317 | char *address_val(char *buf, char *end, const void *addr,
|
| 1318 | struct printf_spec spec, const char *fmt)
|
| 1319 | {
|
| 1320 | unsigned long long num;
|
| 1321 |
|
| 1322 | spec.flags |= SPECIAL | SMALL | ZEROPAD;
|
| 1323 | spec.base = 16;
|
| 1324 |
|
| 1325 | switch (fmt[1]) {
|
| 1326 | case 'd':
|
| 1327 | num = *(const dma_addr_t *)addr;
|
| 1328 | spec.field_width = sizeof(dma_addr_t) * 2 + 2;
|
| 1329 | break;
|
| 1330 | case 'p':
|
| 1331 | default:
|
| 1332 | num = *(const phys_addr_t *)addr;
|
| 1333 | spec.field_width = sizeof(phys_addr_t) * 2 + 2;
|
| 1334 | break;
|
| 1335 | }
|
| 1336 |
|
| 1337 | return number(buf, end, num, spec);
|
| 1338 | }
|
| 1339 |
|
| 1340 | static noinline_for_stack
|
| 1341 | char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
|
| 1342 | const char *fmt)
|
| 1343 | {
|
| 1344 | if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk)
|
| 1345 | return string(buf, end, NULL, spec);
|
| 1346 |
|
| 1347 | switch (fmt[1]) {
|
| 1348 | case 'r':
|
| 1349 | return number(buf, end, clk_get_rate(clk), spec);
|
| 1350 |
|
| 1351 | case 'n':
|
| 1352 | default:
|
| 1353 | #ifdef CONFIG_COMMON_CLK
|
| 1354 | return string(buf, end, __clk_get_name(clk), spec);
|
| 1355 | #else
|
| 1356 | spec.base = 16;
|
| 1357 | spec.field_width = sizeof(unsigned long) * 2 + 2;
|
| 1358 | spec.flags |= SPECIAL | SMALL | ZEROPAD;
|
| 1359 | return number(buf, end, (unsigned long)clk, spec);
|
| 1360 | #endif
|
| 1361 | }
|
| 1362 | }
|
| 1363 |
|
| 1364 | int kptr_restrict __read_mostly;
|
| 1365 |
|
| 1366 | |
| 1367 | * Show a '%p' thing. A kernel extension is that the '%p' is followed
|
| 1368 | * by an extra set of alphanumeric characters that are extended format
|
| 1369 | * specifiers.
|
| 1370 | *
|
| 1371 | * Right now we handle:
|
| 1372 | *
|
| 1373 | * - 'F' For symbolic function descriptor pointers with offset
|
| 1374 | * - 'f' For simple symbolic function names without offset
|
| 1375 | * - 'S' For symbolic direct pointers with offset
|
| 1376 | * - 's' For symbolic direct pointers without offset
|
| 1377 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
|
| 1378 | * - 'B' For backtraced symbolic direct pointers with offset
|
| 1379 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
|
| 1380 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
|
| 1381 | * - 'b[l]' For a bitmap, the number of bits is determined by the field
|
| 1382 | * width which must be explicitly specified either as part of the
|
| 1383 | * format string '%32b[l]' or through '%*b[l]', [l] selects
|
| 1384 | * range-list format instead of hex format
|
| 1385 | * - 'M' For a 6-byte MAC address, it prints the address in the
|
| 1386 | * usual colon-separated hex notation
|
| 1387 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons
|
| 1388 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address
|
| 1389 | * with a dash-separated hex notation
|
| 1390 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
|
| 1391 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
|
| 1392 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
|
| 1393 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's
|
| 1394 | * [S][pfs]
|
| 1395 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
|
| 1396 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
|
| 1397 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses
|
| 1398 | * IPv6 omits the colons (01020304...0f)
|
| 1399 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
|
| 1400 | * [S][pfs]
|
| 1401 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
|
| 1402 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
|
| 1403 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
|
| 1404 | * - 'I[6S]c' for IPv6 addresses printed as specified by
|
| 1405 | * http://tools.ietf.org/html/rfc5952
|
| 1406 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination
|
| 1407 | * of the following flags (see string_escape_mem() for the
|
| 1408 | * details):
|
| 1409 | * a - ESCAPE_ANY
|
| 1410 | * c - ESCAPE_SPECIAL
|
| 1411 | * h - ESCAPE_HEX
|
| 1412 | * n - ESCAPE_NULL
|
| 1413 | * o - ESCAPE_OCTAL
|
| 1414 | * p - ESCAPE_NP
|
| 1415 | * s - ESCAPE_SPACE
|
| 1416 | * By default ESCAPE_ANY_NP is used.
|
| 1417 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
|
| 1418 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
|
| 1419 | * Options for %pU are:
|
| 1420 | * b big endian lower case hex (default)
|
| 1421 | * B big endian UPPER case hex
|
| 1422 | * l little endian lower case hex
|
| 1423 | * L little endian UPPER case hex
|
| 1424 | * big endian output byte order is:
|
| 1425 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
|
| 1426 | * little endian output byte order is:
|
| 1427 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
|
| 1428 | * - 'V' For a struct va_format which contains a format string * and va_list *,
|
| 1429 | * call vsnprintf(->format, *->va_list).
|
| 1430 | * Implements a "recursive vsnprintf".
|
| 1431 | * Do not use this feature without some mechanism to verify the
|
| 1432 | * correctness of the format string and va_list arguments.
|
| 1433 | * - 'K' For a kernel pointer that should be hidden from unprivileged users
|
| 1434 | * - 'NF' For a netdev_features_t
|
| 1435 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
|
| 1436 | * a certain separator (' ' by default):
|
| 1437 | * C colon
|
| 1438 | * D dash
|
| 1439 | * N no separator
|
| 1440 | * The maximum supported length is 64 bytes of the input. Consider
|
| 1441 | * to use print_hex_dump() for the larger input.
|
| 1442 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
|
| 1443 | * (default assumed to be phys_addr_t, passed by reference)
|
| 1444 | * - 'd[234]' For a dentry name (optionally 2-4 last components)
|
| 1445 | * - 'D[234]' Same as 'd' but for a struct file
|
| 1446 | * - 'C' For a clock, it prints the name (Common Clock Framework) or address
|
| 1447 | * (legacy clock framework) of the clock
|
| 1448 | * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
|
| 1449 | * (legacy clock framework) of the clock
|
| 1450 | * - 'Cr' For a clock, it prints the current rate of the clock
|
| 1451 | *
|
| 1452 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
|
| 1453 | * function pointers are really function descriptors, which contain a
|
| 1454 | * pointer to the real address.
|
| 1455 |
|
| 1456 | static noinline_for_stack
|
| 1457 | char *pointer(const char *fmt, char *buf, char *end, void *ptr,
|
| 1458 | struct printf_spec spec)
|
| 1459 | {
|
| 1460 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0);
|
| 1461 |
|
| 1462 | if (!ptr && *fmt != 'K') {
|
| 1463 | |
| 1464 | * Print (null) with the same width as a pointer so it makes
|
| 1465 | * tabular output look nice.
|
| 1466 |
|
| 1467 | if (spec.field_width == -1)
|
| 1468 | spec.field_width = default_width;
|
| 1469 | return string(buf, end, "(null)", spec);
|
| 1470 | }
|
| 1471 |
|
| 1472 | switch (*fmt) {
|
| 1473 | case 'F':
|
| 1474 | case 'f':
|
| 1475 | ptr = dereference_function_descriptor(ptr);
|
| 1476 |
|
| 1477 | case 'S':
|
| 1478 | case 's':
|
| 1479 | case 'B':
|
| 1480 | return symbol_string(buf, end, ptr, spec, fmt);
|
| 1481 | case 'R':
|
| 1482 | case 'r':
|
| 1483 | return resource_string(buf, end, ptr, spec, fmt);
|
| 1484 | case 'h':
|
| 1485 | return hex_string(buf, end, ptr, spec, fmt);
|
| 1486 | case 'b':
|
| 1487 | switch (fmt[1]) {
|
| 1488 | case 'l':
|
| 1489 | return bitmap_list_string(buf, end, ptr, spec, fmt);
|
| 1490 | default:
|
| 1491 | return bitmap_string(buf, end, ptr, spec, fmt);
|
| 1492 | }
|
| 1493 | case 'M':
|
| 1494 | case 'm':
|
| 1495 |
|
| 1496 |
|
| 1497 | return mac_address_string(buf, end, ptr, spec, fmt);
|
| 1498 | case 'I': |
| 1499 | * 4: 1.2.3.4
|
| 1500 | * 6: 0001:0203:...:0708
|
| 1501 | * 6c: 1::708 or 1::1.2.3.4
|
| 1502 |
|
| 1503 | case 'i': |
| 1504 | * 4: 001.002.003.004
|
| 1505 | * 6: 000102...0f
|
| 1506 |
|
| 1507 | switch (fmt[1]) {
|
| 1508 | case '6':
|
| 1509 | return ip6_addr_string(buf, end, ptr, spec, fmt);
|
| 1510 | case '4':
|
| 1511 | return ip4_addr_string(buf, end, ptr, spec, fmt);
|
| 1512 | case 'S': {
|
| 1513 | const union {
|
| 1514 | struct sockaddr raw;
|
| 1515 | struct sockaddr_in v4;
|
| 1516 | struct sockaddr_in6 v6;
|
| 1517 | } *sa = ptr;
|
| 1518 |
|
| 1519 | switch (sa->raw.sa_family) {
|
| 1520 | case AF_INET:
|
| 1521 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
|
| 1522 | case AF_INET6:
|
| 1523 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
|
| 1524 | default:
|
| 1525 | return string(buf, end, "(invalid address)", spec);
|
| 1526 | }}
|
| 1527 | }
|
| 1528 | break;
|
| 1529 | case 'E':
|
| 1530 | return escaped_string(buf, end, ptr, spec, fmt);
|
| 1531 | case 'U':
|
| 1532 | return uuid_string(buf, end, ptr, spec, fmt);
|
| 1533 | case 'V':
|
| 1534 | {
|
| 1535 | va_list va;
|
| 1536 |
|
| 1537 | va_copy(va, *((struct va_format *)ptr)->va);
|
| 1538 | buf += vsnprintf(buf, end > buf ? end - buf : 0,
|
| 1539 | ((struct va_format *)ptr)->fmt, va);
|
| 1540 | va_end(va);
|
| 1541 | return buf;
|
| 1542 | }
|
| 1543 | case 'K':
|
| 1544 | |
| 1545 | * %pK cannot be used in IRQ context because its test
|
| 1546 | * for CAP_SYSLOG would be meaningless.
|
| 1547 |
|
| 1548 | if (kptr_restrict && (in_irq() || in_serving_softirq() ||
|
| 1549 | in_nmi())) {
|
| 1550 | if (spec.field_width == -1)
|
| 1551 | spec.field_width = default_width;
|
| 1552 | return string(buf, end, "pK-error", spec);
|
| 1553 | }
|
| 1554 |
|
| 1555 | switch (kptr_restrict) {
|
| 1556 | case 0:
|
| 1557 |
|
| 1558 | break;
|
| 1559 | case 1: {
|
| 1560 | |
| 1561 | * Only print the real pointer value if the current
|
| 1562 | * process has CAP_SYSLOG and is running with the
|
| 1563 | * same credentials it started with. This is because
|
| 1564 | * access to files is checked at open() time, but %pK
|
| 1565 | * checks permission at read() time. We don't want to
|
| 1566 | * leak pointer values if a binary opens a file using
|
| 1567 | * %pK and then elevates privileges before reading it.
|
| 1568 |
|
| 1569 | const struct cred *cred = current_cred();
|
| 1570 |
|
| 1571 | if (!has_capability_noaudit(current, CAP_SYSLOG) ||
|
| 1572 | !uid_eq(cred->euid, cred->uid) ||
|
| 1573 | !gid_eq(cred->egid, cred->gid))
|
| 1574 | ptr = NULL;
|
| 1575 | break;
|
| 1576 | }
|
| 1577 | case 2:
|
| 1578 | default:
|
| 1579 |
|
| 1580 | ptr = NULL;
|
| 1581 | break;
|
| 1582 | }
|
| 1583 | break;
|
| 1584 |
|
| 1585 | case 'N':
|
| 1586 | switch (fmt[1]) {
|
| 1587 | case 'F':
|
| 1588 | return netdev_feature_string(buf, end, ptr, spec);
|
| 1589 | }
|
| 1590 | break;
|
| 1591 | case 'a':
|
| 1592 | return address_val(buf, end, ptr, spec, fmt);
|
| 1593 | case 'd':
|
| 1594 | return dentry_name(buf, end, ptr, spec, fmt);
|
| 1595 | case 'C':
|
| 1596 | return clock(buf, end, ptr, spec, fmt);
|
| 1597 | case 'D':
|
| 1598 | return dentry_name(buf, end,
|
| 1599 | ((const struct file *)ptr)->f_path.dentry,
|
| 1600 | spec, fmt);
|
| 1601 | }
|
| 1602 | spec.flags |= SMALL;
|
| 1603 | if (spec.field_width == -1) {
|
| 1604 | spec.field_width = default_width;
|
| 1605 | spec.flags |= ZEROPAD;
|
| 1606 | }
|
| 1607 | spec.base = 16;
|
| 1608 |
|
| 1609 | return number(buf, end, (unsigned long) ptr, spec);
|
| 1610 | }
|
| 1611 |
|
| 1612 | |
| 1613 | * Helper function to decode printf style format.
|
| 1614 | * Each call decode a token from the format and return the
|
| 1615 | * number of characters read (or likely the delta where it wants
|
| 1616 | * to go on the next call).
|
| 1617 | * The decoded token is returned through the parameters
|
| 1618 | *
|
| 1619 | * 'h', 'l', or 'L' for integer fields
|
| 1620 | * 'z' support added 23/7/1999 S.H.
|
| 1621 | * 'z' changed to 'Z' --davidm 1/25/99
|
| 1622 | * 't' added for ptrdiff_t
|
| 1623 | *
|
| 1624 | * @fmt: the format string
|
| 1625 | * @type of the token returned
|
| 1626 | * @flags: various flags such as +, -, # tokens..
|
| 1627 | * @field_width: overwritten width
|
| 1628 | * @base: base of the number (octal, hex, ...)
|
| 1629 | * @precision: precision of a number
|
| 1630 | * @qualifier: qualifier of a number (long, size_t, ...)
|
| 1631 |
|
| 1632 | static noinline_for_stack
|
| 1633 | int format_decode(const char *fmt, struct printf_spec *spec)
|
| 1634 | {
|
| 1635 | const char *start = fmt;
|
| 1636 |
|
| 1637 |
|
| 1638 | if (spec->type == FORMAT_TYPE_WIDTH) {
|
| 1639 | if (spec->field_width < 0) {
|
| 1640 | spec->field_width = -spec->field_width;
|
| 1641 | spec->flags |= LEFT;
|
| 1642 | }
|
| 1643 | spec->type = FORMAT_TYPE_NONE;
|
| 1644 | goto precision;
|
| 1645 | }
|
| 1646 |
|
| 1647 |
|
| 1648 | if (spec->type == FORMAT_TYPE_PRECISION) {
|
| 1649 | if (spec->precision < 0)
|
| 1650 | spec->precision = 0;
|
| 1651 |
|
| 1652 | spec->type = FORMAT_TYPE_NONE;
|
| 1653 | goto qualifier;
|
| 1654 | }
|
| 1655 |
|
| 1656 |
|
| 1657 | spec->type = FORMAT_TYPE_NONE;
|
| 1658 |
|
| 1659 | for (; *fmt ; ++fmt) {
|
| 1660 | if (*fmt == '%')
|
| 1661 | break;
|
| 1662 | }
|
| 1663 |
|
| 1664 |
|
| 1665 | if (fmt != start || !*fmt)
|
| 1666 | return fmt - start;
|
| 1667 |
|
| 1668 |
|
| 1669 | spec->flags = 0;
|
| 1670 |
|
| 1671 | while (1) {
|
| 1672 | bool found = true;
|
| 1673 |
|
| 1674 | ++fmt;
|
| 1675 |
|
| 1676 | switch (*fmt) {
|
| 1677 | case '-': spec->flags |= LEFT; break;
|
| 1678 | case '+': spec->flags |= PLUS; break;
|
| 1679 | case ' ': spec->flags |= SPACE; break;
|
| 1680 | case '#': spec->flags |= SPECIAL; break;
|
| 1681 | case '0': spec->flags |= ZEROPAD; break;
|
| 1682 | default: found = false;
|
| 1683 | }
|
| 1684 |
|
| 1685 | if (!found)
|
| 1686 | break;
|
| 1687 | }
|
| 1688 |
|
| 1689 |
|
| 1690 | spec->field_width = -1;
|
| 1691 |
|
| 1692 | if (isdigit(*fmt))
|
| 1693 | spec->field_width = skip_atoi(&fmt);
|
| 1694 | else if (*fmt == '*') {
|
| 1695 |
|
| 1696 | spec->type = FORMAT_TYPE_WIDTH;
|
| 1697 | return ++fmt - start;
|
| 1698 | }
|
| 1699 |
|
| 1700 | precision:
|
| 1701 |
|
| 1702 | spec->precision = -1;
|
| 1703 | if (*fmt == '.') {
|
| 1704 | ++fmt;
|
| 1705 | if (isdigit(*fmt)) {
|
| 1706 | spec->precision = skip_atoi(&fmt);
|
| 1707 | if (spec->precision < 0)
|
| 1708 | spec->precision = 0;
|
| 1709 | } else if (*fmt == '*') {
|
| 1710 |
|
| 1711 | spec->type = FORMAT_TYPE_PRECISION;
|
| 1712 | return ++fmt - start;
|
| 1713 | }
|
| 1714 | }
|
| 1715 |
|
| 1716 | qualifier:
|
| 1717 |
|
| 1718 | spec->qualifier = -1;
|
| 1719 | if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
|
| 1720 | _tolower(*fmt) == 'z' || *fmt == 't') {
|
| 1721 | spec->qualifier = *fmt++;
|
| 1722 | if (unlikely(spec->qualifier == *fmt)) {
|
| 1723 | if (spec->qualifier == 'l') {
|
| 1724 | spec->qualifier = 'L';
|
| 1725 | ++fmt;
|
| 1726 | } else if (spec->qualifier == 'h') {
|
| 1727 | spec->qualifier = 'H';
|
| 1728 | ++fmt;
|
| 1729 | }
|
| 1730 | }
|
| 1731 | }
|
| 1732 |
|
| 1733 |
|
| 1734 | spec->base = 10;
|
| 1735 | switch (*fmt) {
|
| 1736 | case 'c':
|
| 1737 | spec->type = FORMAT_TYPE_CHAR;
|
| 1738 | return ++fmt - start;
|
| 1739 |
|
| 1740 | case 's':
|
| 1741 | spec->type = FORMAT_TYPE_STR;
|
| 1742 | return ++fmt - start;
|
| 1743 |
|
| 1744 | case 'p':
|
| 1745 | spec->type = FORMAT_TYPE_PTR;
|
| 1746 | return ++fmt - start;
|
| 1747 |
|
| 1748 | case '%':
|
| 1749 | spec->type = FORMAT_TYPE_PERCENT_CHAR;
|
| 1750 | return ++fmt - start;
|
| 1751 |
|
| 1752 |
|
| 1753 | case 'o':
|
| 1754 | spec->base = 8;
|
| 1755 | break;
|
| 1756 |
|
| 1757 | case 'x':
|
| 1758 | spec->flags |= SMALL;
|
| 1759 |
|
| 1760 | case 'X':
|
| 1761 | spec->base = 16;
|
| 1762 | break;
|
| 1763 |
|
| 1764 | case 'd':
|
| 1765 | case 'i':
|
| 1766 | spec->flags |= SIGN;
|
| 1767 | case 'u':
|
| 1768 | break;
|
| 1769 |
|
| 1770 | case 'n':
|
| 1771 | |
| 1772 | * Since %n poses a greater security risk than utility, treat
|
| 1773 | * it as an invalid format specifier. Warn about its use so
|
| 1774 | * that new instances don't get added.
|
| 1775 |
|
| 1776 | WARN_ONCE(1, "Please remove ignored %%n in '%s'\n", fmt);
|
| 1777 |
|
| 1778 |
|
| 1779 | default:
|
| 1780 | spec->type = FORMAT_TYPE_INVALID;
|
| 1781 | return fmt - start;
|
| 1782 | }
|
| 1783 |
|
| 1784 | if (spec->qualifier == 'L')
|
| 1785 | spec->type = FORMAT_TYPE_LONG_LONG;
|
| 1786 | else if (spec->qualifier == 'l') {
|
| 1787 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG);
|
| 1788 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN);
|
| 1789 | } else if (_tolower(spec->qualifier) == 'z') {
|
| 1790 | spec->type = FORMAT_TYPE_SIZE_T;
|
| 1791 | } else if (spec->qualifier == 't') {
|
| 1792 | spec->type = FORMAT_TYPE_PTRDIFF;
|
| 1793 | } else if (spec->qualifier == 'H') {
|
| 1794 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE);
|
| 1795 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN);
|
| 1796 | } else if (spec->qualifier == 'h') {
|
| 1797 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT);
|
| 1798 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN);
|
| 1799 | } else {
|
| 1800 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT);
|
| 1801 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN);
|
| 1802 | }
|
| 1803 |
|
| 1804 | return ++fmt - start;
|
| 1805 | }
|
| 1806 |
|
| 1807 | |
| 1808 | * vsnprintf - Format a string and place it in a buffer
|
| 1809 | * @buf: The buffer to place the result into
|
| 1810 | * @size: The size of the buffer, including the trailing null space
|
| 1811 | * @fmt: The format string to use
|
| 1812 | * @args: Arguments for the format string
|
| 1813 | *
|
| 1814 | * This function follows C99 vsnprintf, but has some extensions:
|
| 1815 | * %pS output the name of a text symbol with offset
|
| 1816 | * %ps output the name of a text symbol without offset
|
| 1817 | * %pF output the name of a function pointer with its offset
|
| 1818 | * %pf output the name of a function pointer without its offset
|
| 1819 | * %pB output the name of a backtrace symbol with its offset
|
| 1820 | * %pR output the address range in a struct resource with decoded flags
|
| 1821 | * %pr output the address range in a struct resource with raw flags
|
| 1822 | * %pb output the bitmap with field width as the number of bits
|
| 1823 | * %pbl output the bitmap as range list with field width as the number of bits
|
| 1824 | * %pM output a 6-byte MAC address with colons
|
| 1825 | * %pMR output a 6-byte MAC address with colons in reversed order
|
| 1826 | * %pMF output a 6-byte MAC address with dashes
|
| 1827 | * %pm output a 6-byte MAC address without colons
|
| 1828 | * %pmR output a 6-byte MAC address without colons in reversed order
|
| 1829 | * %pI4 print an IPv4 address without leading zeros
|
| 1830 | * %pi4 print an IPv4 address with leading zeros
|
| 1831 | * %pI6 print an IPv6 address with colons
|
| 1832 | * %pi6 print an IPv6 address without colons
|
| 1833 | * %pI6c print an IPv6 address as specified by RFC 5952
|
| 1834 | * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address
|
| 1835 | * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address
|
| 1836 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
|
| 1837 | * case.
|
| 1838 | * %*pE[achnops] print an escaped buffer
|
| 1839 | * %*ph[CDN] a variable-length hex string with a separator (supports up to 64
|
| 1840 | * bytes of the input)
|
| 1841 | * %pC output the name (Common Clock Framework) or address (legacy clock
|
| 1842 | * framework) of a clock
|
| 1843 | * %pCn output the name (Common Clock Framework) or address (legacy clock
|
| 1844 | * framework) of a clock
|
| 1845 | * %pCr output the current rate of a clock
|
| 1846 | * %n is ignored
|
| 1847 | *
|
| 1848 | * ** Please update Documentation/printk-formats.txt when making changes **
|
| 1849 | *
|
| 1850 | * The return value is the number of characters which would
|
| 1851 | * be generated for the given input, excluding the trailing
|
| 1852 | * '\0', as per ISO C99. If you want to have the exact
|
| 1853 | * number of characters written into @buf as return value
|
| 1854 | * (not including the trailing '\0'), use vscnprintf(). If the
|
| 1855 | * return is greater than or equal to @size, the resulting
|
| 1856 | * string is truncated.
|
| 1857 | *
|
| 1858 | * If you're not already dealing with a va_list consider using snprintf().
|
| 1859 |
|
| 1860 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
|
| 1861 | {
|
| 1862 | unsigned long long num;
|
| 1863 | char *str, *end;
|
| 1864 | struct printf_spec spec = {0};
|
| 1865 |
|
| 1866 | |
| 1867 | used for unknown buffer sizes.
|
| 1868 | if (WARN_ON_ONCE(size > INT_MAX))
|
| 1869 | return 0;
|
| 1870 |
|
| 1871 | str = buf;
|
| 1872 | end = buf + size;
|
| 1873 |
|
| 1874 |
|
| 1875 | if (end < buf) {
|
| 1876 | end = ((void *)-1);
|
| 1877 | size = end - buf;
|
| 1878 | }
|
| 1879 |
|
| 1880 | while (*fmt) {
|
| 1881 | const char *old_fmt = fmt;
|
| 1882 | int read = format_decode(fmt, &spec);
|
| 1883 |
|
| 1884 | fmt += read;
|
| 1885 |
|
| 1886 | switch (spec.type) {
|
| 1887 | case FORMAT_TYPE_NONE: {
|
| 1888 | int copy = read;
|
| 1889 | if (str < end) {
|
| 1890 | if (copy > end - str)
|
| 1891 | copy = end - str;
|
| 1892 | memcpy(str, old_fmt, copy);
|
| 1893 | }
|
| 1894 | str += read;
|
| 1895 | break;
|
| 1896 | }
|
| 1897 |
|
| 1898 | case FORMAT_TYPE_WIDTH:
|
| 1899 | spec.field_width = va_arg(args, int);
|
| 1900 | break;
|
| 1901 |
|
| 1902 | case FORMAT_TYPE_PRECISION:
|
| 1903 | spec.precision = va_arg(args, int);
|
| 1904 | break;
|
| 1905 |
|
| 1906 | case FORMAT_TYPE_CHAR: {
|
| 1907 | char c;
|
| 1908 |
|
| 1909 | if (!(spec.flags & LEFT)) {
|
| 1910 | while (--spec.field_width > 0) {
|
| 1911 | if (str < end)
|
| 1912 | *str = ' ';
|
| 1913 | ++str;
|
| 1914 |
|
| 1915 | }
|
| 1916 | }
|
| 1917 | c = (unsigned char) va_arg(args, int);
|
| 1918 | if (str < end)
|
| 1919 | *str = c;
|
| 1920 | ++str;
|
| 1921 | while (--spec.field_width > 0) {
|
| 1922 | if (str < end)
|
| 1923 | *str = ' ';
|
| 1924 | ++str;
|
| 1925 | }
|
| 1926 | break;
|
| 1927 | }
|
| 1928 |
|
| 1929 | case FORMAT_TYPE_STR:
|
| 1930 | str = string(str, end, va_arg(args, char *), spec);
|
| 1931 | break;
|
| 1932 |
|
| 1933 | case FORMAT_TYPE_PTR:
|
| 1934 | str = pointer(fmt, str, end, va_arg(args, void *),
|
| 1935 | spec);
|
| 1936 | while (isalnum(*fmt))
|
| 1937 | fmt++;
|
| 1938 | break;
|
| 1939 |
|
| 1940 | case FORMAT_TYPE_PERCENT_CHAR:
|
| 1941 | if (str < end)
|
| 1942 | *str = '%';
|
| 1943 | ++str;
|
| 1944 | break;
|
| 1945 |
|
| 1946 | case FORMAT_TYPE_INVALID:
|
| 1947 | if (str < end)
|
| 1948 | *str = '%';
|
| 1949 | ++str;
|
| 1950 | break;
|
| 1951 |
|
| 1952 | default:
|
| 1953 | switch (spec.type) {
|
| 1954 | case FORMAT_TYPE_LONG_LONG:
|
| 1955 | num = va_arg(args, long long);
|
| 1956 | break;
|
| 1957 | case FORMAT_TYPE_ULONG:
|
| 1958 | num = va_arg(args, unsigned long);
|
| 1959 | break;
|
| 1960 | case FORMAT_TYPE_LONG:
|
| 1961 | num = va_arg(args, long);
|
| 1962 | break;
|
| 1963 | case FORMAT_TYPE_SIZE_T:
|
| 1964 | if (spec.flags & SIGN)
|
| 1965 | num = va_arg(args, ssize_t);
|
| 1966 | else
|
| 1967 | num = va_arg(args, size_t);
|
| 1968 | break;
|
| 1969 | case FORMAT_TYPE_PTRDIFF:
|
| 1970 | num = va_arg(args, ptrdiff_t);
|
| 1971 | break;
|
| 1972 | case FORMAT_TYPE_UBYTE:
|
| 1973 | num = (unsigned char) va_arg(args, int);
|
| 1974 | break;
|
| 1975 | case FORMAT_TYPE_BYTE:
|
| 1976 | num = (signed char) va_arg(args, int);
|
| 1977 | break;
|
| 1978 | case FORMAT_TYPE_USHORT:
|
| 1979 | num = (unsigned short) va_arg(args, int);
|
| 1980 | break;
|
| 1981 | case FORMAT_TYPE_SHORT:
|
| 1982 | num = (short) va_arg(args, int);
|
| 1983 | break;
|
| 1984 | case FORMAT_TYPE_INT:
|
| 1985 | num = (int) va_arg(args, int);
|
| 1986 | break;
|
| 1987 | default:
|
| 1988 | num = va_arg(args, unsigned int);
|
| 1989 | }
|
| 1990 |
|
| 1991 | str = number(str, end, num, spec);
|
| 1992 | }
|
| 1993 | }
|
| 1994 |
|
| 1995 | if (size > 0) {
|
| 1996 | if (str < end)
|
| 1997 | *str = '\0';
|
| 1998 | else
|
| 1999 | end[-1] = '\0';
|
| 2000 | }
|
| 2001 |
|
| 2002 |
|
| 2003 | return str-buf;
|
| 2004 |
|
| 2005 | }
|
| 2006 | EXPORT_SYMBOL(vsnprintf);
|
| 2007 |
|
| 2008 | |
| 2009 | * vscnprintf - Format a string and place it in a buffer
|
| 2010 | * @buf: The buffer to place the result into
|
| 2011 | * @size: The size of the buffer, including the trailing null space
|
| 2012 | * @fmt: The format string to use
|
| 2013 | * @args: Arguments for the format string
|
| 2014 | *
|
| 2015 | * The return value is the number of characters which have been written into
|
| 2016 | * the @buf not including the trailing '\0'. If @size is == 0 the function
|
| 2017 | * returns 0.
|
| 2018 | *
|
| 2019 | * If you're not already dealing with a va_list consider using scnprintf().
|
| 2020 | *
|
| 2021 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 2022 |
|
| 2023 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
|
| 2024 | {
|
| 2025 | int i;
|
| 2026 |
|
| 2027 | i = vsnprintf(buf, size, fmt, args);
|
| 2028 |
|
| 2029 | if (likely(i < size))
|
| 2030 | return i;
|
| 2031 | if (size != 0)
|
| 2032 | return size - 1;
|
| 2033 | return 0;
|
| 2034 | }
|
| 2035 | EXPORT_SYMBOL(vscnprintf);
|
| 2036 |
|
| 2037 | |
| 2038 | * snprintf - Format a string and place it in a buffer
|
| 2039 | * @buf: The buffer to place the result into
|
| 2040 | * @size: The size of the buffer, including the trailing null space
|
| 2041 | * @fmt: The format string to use
|
| 2042 | * @...: Arguments for the format string
|
| 2043 | *
|
| 2044 | * The return value is the number of characters which would be
|
| 2045 | * generated for the given input, excluding the trailing null,
|
| 2046 | * as per ISO C99. If the return is greater than or equal to
|
| 2047 | * @size, the resulting string is truncated.
|
| 2048 | *
|
| 2049 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 2050 |
|
| 2051 | int snprintf(char *buf, size_t size, const char *fmt, ...)
|
| 2052 | {
|
| 2053 | va_list args;
|
| 2054 | int i;
|
| 2055 |
|
| 2056 | va_start(args, fmt);
|
| 2057 | i = vsnprintf(buf, size, fmt, args);
|
| 2058 | va_end(args);
|
| 2059 |
|
| 2060 | return i;
|
| 2061 | }
|
| 2062 | EXPORT_SYMBOL(snprintf);
|
| 2063 |
|
| 2064 | |
| 2065 | * scnprintf - Format a string and place it in a buffer
|
| 2066 | * @buf: The buffer to place the result into
|
| 2067 | * @size: The size of the buffer, including the trailing null space
|
| 2068 | * @fmt: The format string to use
|
| 2069 | * @...: Arguments for the format string
|
| 2070 | *
|
| 2071 | * The return value is the number of characters written into @buf not including
|
| 2072 | * the trailing '\0'. If @size is == 0 the function returns 0.
|
| 2073 |
|
| 2074 |
|
| 2075 | int scnprintf(char *buf, size_t size, const char *fmt, ...)
|
| 2076 | {
|
| 2077 | va_list args;
|
| 2078 | int i;
|
| 2079 |
|
| 2080 | va_start(args, fmt);
|
| 2081 | i = vscnprintf(buf, size, fmt, args);
|
| 2082 | va_end(args);
|
| 2083 |
|
| 2084 | return i;
|
| 2085 | }
|
| 2086 | EXPORT_SYMBOL(scnprintf);
|
| 2087 |
|
| 2088 | |
| 2089 | * vsprintf - Format a string and place it in a buffer
|
| 2090 | * @buf: The buffer to place the result into
|
| 2091 | * @fmt: The format string to use
|
| 2092 | * @args: Arguments for the format string
|
| 2093 | *
|
| 2094 | * The function returns the number of characters written
|
| 2095 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
|
| 2096 | * buffer overflows.
|
| 2097 | *
|
| 2098 | * If you're not already dealing with a va_list consider using sprintf().
|
| 2099 | *
|
| 2100 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 2101 |
|
| 2102 | int vsprintf(char *buf, const char *fmt, va_list args)
|
| 2103 | {
|
| 2104 | return vsnprintf(buf, INT_MAX, fmt, args);
|
| 2105 | }
|
| 2106 | EXPORT_SYMBOL(vsprintf);
|
| 2107 |
|
| 2108 | |
| 2109 | * sprintf - Format a string and place it in a buffer
|
| 2110 | * @buf: The buffer to place the result into
|
| 2111 | * @fmt: The format string to use
|
| 2112 | * @...: Arguments for the format string
|
| 2113 | *
|
| 2114 | * The function returns the number of characters written
|
| 2115 | * into @buf. Use snprintf() or scnprintf() in order to avoid
|
| 2116 | * buffer overflows.
|
| 2117 | *
|
| 2118 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 2119 |
|
| 2120 | int sprintf(char *buf, const char *fmt, ...)
|
| 2121 | {
|
| 2122 | va_list args;
|
| 2123 | int i;
|
| 2124 |
|
| 2125 | va_start(args, fmt);
|
| 2126 | i = vsnprintf(buf, INT_MAX, fmt, args);
|
| 2127 | va_end(args);
|
| 2128 |
|
| 2129 | return i;
|
| 2130 | }
|
| 2131 | EXPORT_SYMBOL(sprintf);
|
| 2132 |
|
| 2133 | #ifdef CONFIG_BINARY_PRINTF
|
| 2134 | |
| 2135 | * bprintf service:
|
| 2136 | * vbin_printf() - VA arguments to binary data
|
| 2137 | * bstr_printf() - Binary data to text string
|
| 2138 |
|
| 2139 |
|
| 2140 | |
| 2141 | * vbin_printf - Parse a format string and place args' binary value in a buffer
|
| 2142 | * @bin_buf: The buffer to place args' binary value
|
| 2143 | * @size: The size of the buffer(by words(32bits), not characters)
|
| 2144 | * @fmt: The format string to use
|
| 2145 | * @args: Arguments for the format string
|
| 2146 | *
|
| 2147 | * The format follows C99 vsnprintf, except %n is ignored, and its argument
|
| 2148 | * is skipped.
|
| 2149 | *
|
| 2150 | * The return value is the number of words(32bits) which would be generated for
|
| 2151 | * the given input.
|
| 2152 | *
|
| 2153 | * NOTE:
|
| 2154 | * If the return value is greater than @size, the resulting bin_buf is NOT
|
| 2155 | * valid for bstr_printf().
|
| 2156 |
|
| 2157 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
|
| 2158 | {
|
| 2159 | struct printf_spec spec = {0};
|
| 2160 | char *str, *end;
|
| 2161 |
|
| 2162 | str = (char *)bin_buf;
|
| 2163 | end = (char *)(bin_buf + size);
|
| 2164 |
|
| 2165 | #define save_arg(type) \
|
| 2166 | do { \
|
| 2167 | if (sizeof(type) == 8) { \
|
| 2168 | unsigned long long value; \
|
| 2169 | str = PTR_ALIGN(str, sizeof(u32)); \
|
| 2170 | value = va_arg(args, unsigned long long); \
|
| 2171 | if (str + sizeof(type) <= end) { \
|
| 2172 | *(u32 *)str = *(u32 *)&value; \
|
| 2173 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \
|
| 2174 | } \
|
| 2175 | } else { \
|
| 2176 | unsigned long value; \
|
| 2177 | str = PTR_ALIGN(str, sizeof(type)); \
|
| 2178 | value = va_arg(args, int); \
|
| 2179 | if (str + sizeof(type) <= end) \
|
| 2180 | *(typeof(type) *)str = (type)value; \
|
| 2181 | } \
|
| 2182 | str += sizeof(type); \
|
| 2183 | } while (0)
|
| 2184 |
|
| 2185 | while (*fmt) {
|
| 2186 | int read = format_decode(fmt, &spec);
|
| 2187 |
|
| 2188 | fmt += read;
|
| 2189 |
|
| 2190 | switch (spec.type) {
|
| 2191 | case FORMAT_TYPE_NONE:
|
| 2192 | case FORMAT_TYPE_INVALID:
|
| 2193 | case FORMAT_TYPE_PERCENT_CHAR:
|
| 2194 | break;
|
| 2195 |
|
| 2196 | case FORMAT_TYPE_WIDTH:
|
| 2197 | case FORMAT_TYPE_PRECISION:
|
| 2198 | save_arg(int);
|
| 2199 | break;
|
| 2200 |
|
| 2201 | case FORMAT_TYPE_CHAR:
|
| 2202 | save_arg(char);
|
| 2203 | break;
|
| 2204 |
|
| 2205 | case FORMAT_TYPE_STR: {
|
| 2206 | const char *save_str = va_arg(args, char *);
|
| 2207 | size_t len;
|
| 2208 |
|
| 2209 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
|
| 2210 | || (unsigned long)save_str < PAGE_SIZE)
|
| 2211 | save_str = "(null)";
|
| 2212 | len = strlen(save_str) + 1;
|
| 2213 | if (str + len < end)
|
| 2214 | memcpy(str, save_str, len);
|
| 2215 | str += len;
|
| 2216 | break;
|
| 2217 | }
|
| 2218 |
|
| 2219 | case FORMAT_TYPE_PTR:
|
| 2220 | save_arg(void *);
|
| 2221 |
|
| 2222 | while (isalnum(*fmt))
|
| 2223 | fmt++;
|
| 2224 | break;
|
| 2225 |
|
| 2226 | default:
|
| 2227 | switch (spec.type) {
|
| 2228 |
|
| 2229 | case FORMAT_TYPE_LONG_LONG:
|
| 2230 | save_arg(long long);
|
| 2231 | break;
|
| 2232 | case FORMAT_TYPE_ULONG:
|
| 2233 | case FORMAT_TYPE_LONG:
|
| 2234 | save_arg(unsigned long);
|
| 2235 | break;
|
| 2236 | case FORMAT_TYPE_SIZE_T:
|
| 2237 | save_arg(size_t);
|
| 2238 | break;
|
| 2239 | case FORMAT_TYPE_PTRDIFF:
|
| 2240 | save_arg(ptrdiff_t);
|
| 2241 | break;
|
| 2242 | case FORMAT_TYPE_UBYTE:
|
| 2243 | case FORMAT_TYPE_BYTE:
|
| 2244 | save_arg(char);
|
| 2245 | break;
|
| 2246 | case FORMAT_TYPE_USHORT:
|
| 2247 | case FORMAT_TYPE_SHORT:
|
| 2248 | save_arg(short);
|
| 2249 | break;
|
| 2250 | default:
|
| 2251 | save_arg(int);
|
| 2252 | }
|
| 2253 | }
|
| 2254 | }
|
| 2255 |
|
| 2256 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
|
| 2257 | #undef save_arg
|
| 2258 | }
|
| 2259 | EXPORT_SYMBOL_GPL(vbin_printf);
|
| 2260 |
|
| 2261 | |
| 2262 | * bstr_printf - Format a string from binary arguments and place it in a buffer
|
| 2263 | * @buf: The buffer to place the result into
|
| 2264 | * @size: The size of the buffer, including the trailing null space
|
| 2265 | * @fmt: The format string to use
|
| 2266 | * @bin_buf: Binary arguments for the format string
|
| 2267 | *
|
| 2268 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets
|
| 2269 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
|
| 2270 | * a binary buffer that generated by vbin_printf.
|
| 2271 | *
|
| 2272 | * The format follows C99 vsnprintf, but has some extensions:
|
| 2273 | * see vsnprintf comment for details.
|
| 2274 | *
|
| 2275 | * The return value is the number of characters which would
|
| 2276 | * be generated for the given input, excluding the trailing
|
| 2277 | * '\0', as per ISO C99. If you want to have the exact
|
| 2278 | * number of characters written into @buf as return value
|
| 2279 | * (not including the trailing '\0'), use vscnprintf(). If the
|
| 2280 | * return is greater than or equal to @size, the resulting
|
| 2281 | * string is truncated.
|
| 2282 |
|
| 2283 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
|
| 2284 | {
|
| 2285 | struct printf_spec spec = {0};
|
| 2286 | char *str, *end;
|
| 2287 | const char *args = (const char *)bin_buf;
|
| 2288 |
|
| 2289 | if (WARN_ON_ONCE((int) size < 0))
|
| 2290 | return 0;
|
| 2291 |
|
| 2292 | str = buf;
|
| 2293 | end = buf + size;
|
| 2294 |
|
| 2295 | #define get_arg(type) \
|
| 2296 | ({ \
|
| 2297 | typeof(type) value; \
|
| 2298 | if (sizeof(type) == 8) { \
|
| 2299 | args = PTR_ALIGN(args, sizeof(u32)); \
|
| 2300 | *(u32 *)&value = *(u32 *)args; \
|
| 2301 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \
|
| 2302 | } else { \
|
| 2303 | args = PTR_ALIGN(args, sizeof(type)); \
|
| 2304 | value = *(typeof(type) *)args; \
|
| 2305 | } \
|
| 2306 | args += sizeof(type); \
|
| 2307 | value; \
|
| 2308 | })
|
| 2309 |
|
| 2310 |
|
| 2311 | if (end < buf) {
|
| 2312 | end = ((void *)-1);
|
| 2313 | size = end - buf;
|
| 2314 | }
|
| 2315 |
|
| 2316 | while (*fmt) {
|
| 2317 | const char *old_fmt = fmt;
|
| 2318 | int read = format_decode(fmt, &spec);
|
| 2319 |
|
| 2320 | fmt += read;
|
| 2321 |
|
| 2322 | switch (spec.type) {
|
| 2323 | case FORMAT_TYPE_NONE: {
|
| 2324 | int copy = read;
|
| 2325 | if (str < end) {
|
| 2326 | if (copy > end - str)
|
| 2327 | copy = end - str;
|
| 2328 | memcpy(str, old_fmt, copy);
|
| 2329 | }
|
| 2330 | str += read;
|
| 2331 | break;
|
| 2332 | }
|
| 2333 |
|
| 2334 | case FORMAT_TYPE_WIDTH:
|
| 2335 | spec.field_width = get_arg(int);
|
| 2336 | break;
|
| 2337 |
|
| 2338 | case FORMAT_TYPE_PRECISION:
|
| 2339 | spec.precision = get_arg(int);
|
| 2340 | break;
|
| 2341 |
|
| 2342 | case FORMAT_TYPE_CHAR: {
|
| 2343 | char c;
|
| 2344 |
|
| 2345 | if (!(spec.flags & LEFT)) {
|
| 2346 | while (--spec.field_width > 0) {
|
| 2347 | if (str < end)
|
| 2348 | *str = ' ';
|
| 2349 | ++str;
|
| 2350 | }
|
| 2351 | }
|
| 2352 | c = (unsigned char) get_arg(char);
|
| 2353 | if (str < end)
|
| 2354 | *str = c;
|
| 2355 | ++str;
|
| 2356 | while (--spec.field_width > 0) {
|
| 2357 | if (str < end)
|
| 2358 | *str = ' ';
|
| 2359 | ++str;
|
| 2360 | }
|
| 2361 | break;
|
| 2362 | }
|
| 2363 |
|
| 2364 | case FORMAT_TYPE_STR: {
|
| 2365 | const char *str_arg = args;
|
| 2366 | args += strlen(str_arg) + 1;
|
| 2367 | str = string(str, end, (char *)str_arg, spec);
|
| 2368 | break;
|
| 2369 | }
|
| 2370 |
|
| 2371 | case FORMAT_TYPE_PTR:
|
| 2372 | str = pointer(fmt, str, end, get_arg(void *), spec);
|
| 2373 | while (isalnum(*fmt))
|
| 2374 | fmt++;
|
| 2375 | break;
|
| 2376 |
|
| 2377 | case FORMAT_TYPE_PERCENT_CHAR:
|
| 2378 | case FORMAT_TYPE_INVALID:
|
| 2379 | if (str < end)
|
| 2380 | *str = '%';
|
| 2381 | ++str;
|
| 2382 | break;
|
| 2383 |
|
| 2384 | default: {
|
| 2385 | unsigned long long num;
|
| 2386 |
|
| 2387 | switch (spec.type) {
|
| 2388 |
|
| 2389 | case FORMAT_TYPE_LONG_LONG:
|
| 2390 | num = get_arg(long long);
|
| 2391 | break;
|
| 2392 | case FORMAT_TYPE_ULONG:
|
| 2393 | case FORMAT_TYPE_LONG:
|
| 2394 | num = get_arg(unsigned long);
|
| 2395 | break;
|
| 2396 | case FORMAT_TYPE_SIZE_T:
|
| 2397 | num = get_arg(size_t);
|
| 2398 | break;
|
| 2399 | case FORMAT_TYPE_PTRDIFF:
|
| 2400 | num = get_arg(ptrdiff_t);
|
| 2401 | break;
|
| 2402 | case FORMAT_TYPE_UBYTE:
|
| 2403 | num = get_arg(unsigned char);
|
| 2404 | break;
|
| 2405 | case FORMAT_TYPE_BYTE:
|
| 2406 | num = get_arg(signed char);
|
| 2407 | break;
|
| 2408 | case FORMAT_TYPE_USHORT:
|
| 2409 | num = get_arg(unsigned short);
|
| 2410 | break;
|
| 2411 | case FORMAT_TYPE_SHORT:
|
| 2412 | num = get_arg(short);
|
| 2413 | break;
|
| 2414 | case FORMAT_TYPE_UINT:
|
| 2415 | num = get_arg(unsigned int);
|
| 2416 | break;
|
| 2417 | default:
|
| 2418 | num = get_arg(int);
|
| 2419 | }
|
| 2420 |
|
| 2421 | str = number(str, end, num, spec);
|
| 2422 | }
|
| 2423 | }
|
| 2424 | }
|
| 2425 |
|
| 2426 | if (size > 0) {
|
| 2427 | if (str < end)
|
| 2428 | *str = '\0';
|
| 2429 | else
|
| 2430 | end[-1] = '\0';
|
| 2431 | }
|
| 2432 |
|
| 2433 | #undef get_arg
|
| 2434 |
|
| 2435 |
|
| 2436 | return str - buf;
|
| 2437 | }
|
| 2438 | EXPORT_SYMBOL_GPL(bstr_printf);
|
| 2439 |
|
| 2440 | |
| 2441 | * bprintf - Parse a format string and place args' binary value in a buffer
|
| 2442 | * @bin_buf: The buffer to place args' binary value
|
| 2443 | * @size: The size of the buffer(by words(32bits), not characters)
|
| 2444 | * @fmt: The format string to use
|
| 2445 | * @...: Arguments for the format string
|
| 2446 | *
|
| 2447 | * The function returns the number of words(u32) written
|
| 2448 | * into @bin_buf.
|
| 2449 |
|
| 2450 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
|
| 2451 | {
|
| 2452 | va_list args;
|
| 2453 | int ret;
|
| 2454 |
|
| 2455 | va_start(args, fmt);
|
| 2456 | ret = vbin_printf(bin_buf, size, fmt, args);
|
| 2457 | va_end(args);
|
| 2458 |
|
| 2459 | return ret;
|
| 2460 | }
|
| 2461 | EXPORT_SYMBOL_GPL(bprintf);
|
| 2462 |
|
| 2463 | #endif
|
| 2464 |
|
| 2465 | |
| 2466 | * vsscanf - Unformat a buffer into a list of arguments
|
| 2467 | * @buf: input buffer
|
| 2468 | * @fmt: format of buffer
|
| 2469 | * @args: arguments
|
| 2470 |
|
| 2471 | int vsscanf(const char *buf, const char *fmt, va_list args)
|
| 2472 | {
|
| 2473 | const char *str = buf;
|
| 2474 | char *next;
|
| 2475 | char digit;
|
| 2476 | int num = 0;
|
| 2477 | u8 qualifier;
|
| 2478 | unsigned int base;
|
| 2479 | union {
|
| 2480 | long long s;
|
| 2481 | unsigned long long u;
|
| 2482 | } val;
|
| 2483 | s16 field_width;
|
| 2484 | bool is_sign;
|
| 2485 |
|
| 2486 | while (*fmt) {
|
| 2487 |
|
| 2488 | |
| 2489 | * white space, including none, in the input.
|
| 2490 |
|
| 2491 | if (isspace(*fmt)) {
|
| 2492 | fmt = skip_spaces(++fmt);
|
| 2493 | str = skip_spaces(str);
|
| 2494 | }
|
| 2495 |
|
| 2496 |
|
| 2497 | if (*fmt != '%' && *fmt) {
|
| 2498 | if (*fmt++ != *str++)
|
| 2499 | break;
|
| 2500 | continue;
|
| 2501 | }
|
| 2502 |
|
| 2503 | if (!*fmt)
|
| 2504 | break;
|
| 2505 | ++fmt;
|
| 2506 |
|
| 2507 | |
| 2508 | * advance both strings to next white space
|
| 2509 |
|
| 2510 | if (*fmt == '*') {
|
| 2511 | if (!*str)
|
| 2512 | break;
|
| 2513 | while (!isspace(*fmt) && *fmt != '%' && *fmt)
|
| 2514 | fmt++;
|
| 2515 | while (!isspace(*str) && *str)
|
| 2516 | str++;
|
| 2517 | continue;
|
| 2518 | }
|
| 2519 |
|
| 2520 |
|
| 2521 | field_width = -1;
|
| 2522 | if (isdigit(*fmt)) {
|
| 2523 | field_width = skip_atoi(&fmt);
|
| 2524 | if (field_width <= 0)
|
| 2525 | break;
|
| 2526 | }
|
| 2527 |
|
| 2528 |
|
| 2529 | qualifier = -1;
|
| 2530 | if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
|
| 2531 | _tolower(*fmt) == 'z') {
|
| 2532 | qualifier = *fmt++;
|
| 2533 | if (unlikely(qualifier == *fmt)) {
|
| 2534 | if (qualifier == 'h') {
|
| 2535 | qualifier = 'H';
|
| 2536 | fmt++;
|
| 2537 | } else if (qualifier == 'l') {
|
| 2538 | qualifier = 'L';
|
| 2539 | fmt++;
|
| 2540 | }
|
| 2541 | }
|
| 2542 | }
|
| 2543 |
|
| 2544 | if (!*fmt)
|
| 2545 | break;
|
| 2546 |
|
| 2547 | if (*fmt == 'n') {
|
| 2548 |
|
| 2549 | *va_arg(args, int *) = str - buf;
|
| 2550 | ++fmt;
|
| 2551 | continue;
|
| 2552 | }
|
| 2553 |
|
| 2554 | if (!*str)
|
| 2555 | break;
|
| 2556 |
|
| 2557 | base = 10;
|
| 2558 | is_sign = false;
|
| 2559 |
|
| 2560 | switch (*fmt++) {
|
| 2561 | case 'c':
|
| 2562 | {
|
| 2563 | char *s = (char *)va_arg(args, char*);
|
| 2564 | if (field_width == -1)
|
| 2565 | field_width = 1;
|
| 2566 | do {
|
| 2567 | *s++ = *str++;
|
| 2568 | } while (--field_width > 0 && *str);
|
| 2569 | num++;
|
| 2570 | }
|
| 2571 | continue;
|
| 2572 | case 's':
|
| 2573 | {
|
| 2574 | char *s = (char *)va_arg(args, char *);
|
| 2575 | if (field_width == -1)
|
| 2576 | field_width = SHRT_MAX;
|
| 2577 |
|
| 2578 | str = skip_spaces(str);
|
| 2579 |
|
| 2580 |
|
| 2581 | while (*str && !isspace(*str) && field_width--)
|
| 2582 | *s++ = *str++;
|
| 2583 | *s = '\0';
|
| 2584 | num++;
|
| 2585 | }
|
| 2586 | continue;
|
| 2587 | case 'o':
|
| 2588 | base = 8;
|
| 2589 | break;
|
| 2590 | case 'x':
|
| 2591 | case 'X':
|
| 2592 | base = 16;
|
| 2593 | break;
|
| 2594 | case 'i':
|
| 2595 | base = 0;
|
| 2596 | case 'd':
|
| 2597 | is_sign = true;
|
| 2598 | case 'u':
|
| 2599 | break;
|
| 2600 | case '%':
|
| 2601 |
|
| 2602 | if (*str++ != '%')
|
| 2603 | return num;
|
| 2604 | continue;
|
| 2605 | default:
|
| 2606 |
|
| 2607 | return num;
|
| 2608 | }
|
| 2609 |
|
| 2610 | |
| 2611 | * first, skip white space in buffer.
|
| 2612 |
|
| 2613 | str = skip_spaces(str);
|
| 2614 |
|
| 2615 | digit = *str;
|
| 2616 | if (is_sign && digit == '-')
|
| 2617 | digit = *(str + 1);
|
| 2618 |
|
| 2619 | if (!digit
|
| 2620 | || (base == 16 && !isxdigit(digit))
|
| 2621 | || (base == 10 && !isdigit(digit))
|
| 2622 | || (base == 8 && (!isdigit(digit) || digit > '7'))
|
| 2623 | || (base == 0 && !isdigit(digit)))
|
| 2624 | break;
|
| 2625 |
|
| 2626 | if (is_sign)
|
| 2627 | val.s = qualifier != 'L' ?
|
| 2628 | simple_strtol(str, &next, base) :
|
| 2629 | simple_strtoll(str, &next, base);
|
| 2630 | else
|
| 2631 | val.u = qualifier != 'L' ?
|
| 2632 | simple_strtoul(str, &next, base) :
|
| 2633 | simple_strtoull(str, &next, base);
|
| 2634 |
|
| 2635 | if (field_width > 0 && next - str > field_width) {
|
| 2636 | if (base == 0)
|
| 2637 | _parse_integer_fixup_radix(str, &base);
|
| 2638 | while (next - str > field_width) {
|
| 2639 | if (is_sign)
|
| 2640 | val.s = div_s64(val.s, base);
|
| 2641 | else
|
| 2642 | val.u = div_u64(val.u, base);
|
| 2643 | --next;
|
| 2644 | }
|
| 2645 | }
|
| 2646 |
|
| 2647 | switch (qualifier) {
|
| 2648 | case 'H':
|
| 2649 | if (is_sign)
|
| 2650 | *va_arg(args, signed char *) = val.s;
|
| 2651 | else
|
| 2652 | *va_arg(args, unsigned char *) = val.u;
|
| 2653 | break;
|
| 2654 | case 'h':
|
| 2655 | if (is_sign)
|
| 2656 | *va_arg(args, short *) = val.s;
|
| 2657 | else
|
| 2658 | *va_arg(args, unsigned short *) = val.u;
|
| 2659 | break;
|
| 2660 | case 'l':
|
| 2661 | if (is_sign)
|
| 2662 | *va_arg(args, long *) = val.s;
|
| 2663 | else
|
| 2664 | *va_arg(args, unsigned long *) = val.u;
|
| 2665 | break;
|
| 2666 | case 'L':
|
| 2667 | if (is_sign)
|
| 2668 | *va_arg(args, long long *) = val.s;
|
| 2669 | else
|
| 2670 | *va_arg(args, unsigned long long *) = val.u;
|
| 2671 | break;
|
| 2672 | case 'Z':
|
| 2673 | case 'z':
|
| 2674 | *va_arg(args, size_t *) = val.u;
|
| 2675 | break;
|
| 2676 | default:
|
| 2677 | if (is_sign)
|
| 2678 | *va_arg(args, int *) = val.s;
|
| 2679 | else
|
| 2680 | *va_arg(args, unsigned int *) = val.u;
|
| 2681 | break;
|
| 2682 | }
|
| 2683 | num++;
|
| 2684 |
|
| 2685 | if (!next)
|
| 2686 | break;
|
| 2687 | str = next;
|
| 2688 | }
|
| 2689 |
|
| 2690 | return num;
|
| 2691 | }
|
| 2692 | EXPORT_SYMBOL(vsscanf);
|
| 2693 |
|
| 2694 | |
| 2695 | * sscanf - Unformat a buffer into a list of arguments
|
| 2696 | * @buf: input buffer
|
| 2697 | * @fmt: formatting of buffer
|
| 2698 | * @...: resulting arguments
|
| 2699 |
|
| 2700 | int sscanf(const char *buf, const char *fmt, ...)
|
| 2701 | {
|
| 2702 | va_list args;
|
| 2703 | int i;
|
| 2704 |
|
| 2705 | va_start(args, fmt);
|
| 2706 | i = vsscanf(buf, fmt, args);
|
| 2707 | va_end(args);
|
| 2708 |
|
| 2709 | return i;
|
| 2710 | }
|
| 2711 | EXPORT_SYMBOL(sscanf);
|