| 1 | |
| 2 | * linux/lib/vsprintf.c
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| 3 | *
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| 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
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| 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 |
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| 18 |
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| 19 | #include <stdarg.h>
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| 20 | #include <linux/module.h>
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| 21 | #include <linux/types.h>
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| 22 | #include <linux/string.h>
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| 23 | #include <linux/ctype.h>
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| 24 | #include <linux/kernel.h>
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| 25 | #include <linux/kallsyms.h>
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| 26 | #include <linux/math64.h>
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| 27 | #include <linux/uaccess.h>
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| 28 | #include <linux/ioport.h>
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| 29 | #include <linux/dcache.h>
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| 30 | #include <linux/cred.h>
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| 31 | #include <net/addrconf.h>
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| 32 |
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| 33 | #include <asm/page.h>
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| 34 | #include <asm/sections.h>
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| 35 |
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| 36 | #include "kstrtox.h"
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| 37 |
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| 38 | |
| 39 | * simple_strtoull - convert a string to an unsigned long long
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| 40 | * @cp: The start of the string
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| 41 | * @endp: A pointer to the end of the parsed string will be placed here
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| 42 | * @base: The number base to use
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| 43 | *
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| 44 | * This function is obsolete. Please use kstrtoull instead.
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| 45 |
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| 46 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
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| 47 | {
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| 48 | unsigned long long result;
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| 49 | unsigned int rv;
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| 50 |
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| 51 | cp = _parse_integer_fixup_radix(cp, &base);
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| 52 | rv = _parse_integer(cp, base, &result);
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| 53 |
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| 54 | cp += (rv & ~KSTRTOX_OVERFLOW);
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| 55 |
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| 56 | if (endp)
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| 57 | *endp = (char *)cp;
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| 58 |
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| 59 | return result;
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| 60 | }
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| 61 | EXPORT_SYMBOL(simple_strtoull);
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| 62 |
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| 63 | |
| 64 | * simple_strtoul - convert a string to an unsigned long
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| 65 | * @cp: The start of the string
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| 66 | * @endp: A pointer to the end of the parsed string will be placed here
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| 67 | * @base: The number base to use
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| 68 | *
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| 69 | * This function is obsolete. Please use kstrtoul instead.
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| 70 |
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| 71 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
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| 72 | {
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| 73 | return simple_strtoull(cp, endp, base);
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| 74 | }
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| 75 | EXPORT_SYMBOL(simple_strtoul);
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| 76 |
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| 77 | |
| 78 | * simple_strtol - convert a string to a signed long
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| 79 | * @cp: The start of the string
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| 80 | * @endp: A pointer to the end of the parsed string will be placed here
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| 81 | * @base: The number base to use
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| 82 | *
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| 83 | * This function is obsolete. Please use kstrtol instead.
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| 84 |
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| 85 | long simple_strtol(const char *cp, char **endp, unsigned int base)
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| 86 | {
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| 87 | if (*cp == '-')
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| 88 | return -simple_strtoul(cp + 1, endp, base);
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| 89 |
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| 90 | return simple_strtoul(cp, endp, base);
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| 91 | }
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| 92 | EXPORT_SYMBOL(simple_strtol);
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| 93 |
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| 94 | |
| 95 | * simple_strtoll - convert a string to a signed long long
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| 96 | * @cp: The start of the string
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| 97 | * @endp: A pointer to the end of the parsed string will be placed here
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| 98 | * @base: The number base to use
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| 99 | *
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| 100 | * This function is obsolete. Please use kstrtoll instead.
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| 101 |
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| 102 | long long simple_strtoll(const char *cp, char **endp, unsigned int base)
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| 103 | {
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| 104 | if (*cp == '-')
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| 105 | return -simple_strtoull(cp + 1, endp, base);
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| 106 |
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| 107 | return simple_strtoull(cp, endp, base);
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| 108 | }
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| 109 | EXPORT_SYMBOL(simple_strtoll);
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| 110 |
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| 111 | static noinline_for_stack
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| 112 | int skip_atoi(const char **s)
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| 113 | {
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| 114 | int i = 0;
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| 115 |
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| 116 | while (isdigit(**s))
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| 117 | i = i*10 + *((*s)++) - '0';
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| 118 |
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| 119 | return i;
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| 120 | }
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| 121 |
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| 122 | |
| 123 | * for /proc and /sys data. This directly impacts e.g. top performance
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| 124 | * with many processes running. We optimize it for speed
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| 125 | * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html>
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| 126 | * (with permission from the author, Douglas W. Jones).
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| 127 |
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| 128 |
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| 129 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64
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| 130 |
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| 131 | static noinline_for_stack
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| 132 | char *put_dec_full9(char *buf, unsigned q)
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| 133 | {
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| 134 | unsigned r;
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| 135 |
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| 136 | |
| 137 | * Possible ways to approx. divide by 10
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| 138 | * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit)
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| 139 | * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul)
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| 140 | * (x * 0x6667) >> 18 x < 43699
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| 141 | * (x * 0x3334) >> 17 x < 16389
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| 142 | * (x * 0x199a) >> 16 x < 16389
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| 143 | * (x * 0x0ccd) >> 15 x < 16389
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| 144 | * (x * 0x0667) >> 14 x < 2739
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| 145 | * (x * 0x0334) >> 13 x < 1029
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| 146 | * (x * 0x019a) >> 12 x < 1029
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| 147 | * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386)
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| 148 | * (x * 0x0067) >> 10 x < 179
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| 149 | * (x * 0x0034) >> 9 x < 69 same
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| 150 | * (x * 0x001a) >> 8 x < 69 same
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| 151 | * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386)
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| 152 | * (x * 0x0007) >> 6 x < 19
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| 153 | * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html>
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| 154 |
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| 155 | r = (q * (uint64_t)0x1999999a) >> 32;
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| 156 | *buf++ = (q - 10 * r) + '0';
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| 157 | q = (r * (uint64_t)0x1999999a) >> 32;
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| 158 | *buf++ = (r - 10 * q) + '0';
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| 159 | r = (q * (uint64_t)0x1999999a) >> 32;
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| 160 | *buf++ = (q - 10 * r) + '0';
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| 161 | q = (r * (uint64_t)0x1999999a) >> 32;
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| 162 | *buf++ = (r - 10 * q) + '0';
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| 163 | r = (q * (uint64_t)0x1999999a) >> 32;
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| 164 | *buf++ = (q - 10 * r) + '0';
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| 165 |
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| 166 | q = (r * 0x199a) >> 16;
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| 167 | *buf++ = (r - 10 * q) + '0';
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| 168 | r = (q * 0xcd) >> 11;
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| 169 | *buf++ = (q - 10 * r) + '0';
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| 170 | q = (r * 0xcd) >> 11;
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| 171 | *buf++ = (r - 10 * q) + '0';
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| 172 | *buf++ = q + '0';
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| 173 | return buf;
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| 174 | }
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| 175 | #endif
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| 176 |
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| 177 | |
| 178 | * Code can be easily arranged to print 9 digits too, but our callers
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| 179 | * always call put_dec_full9() instead when the number has 9 decimal digits.
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| 180 |
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| 181 | static noinline_for_stack
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| 182 | char *put_dec_trunc8(char *buf, unsigned r)
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| 183 | {
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| 184 | unsigned q;
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| 185 |
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| 186 |
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| 187 | while (r >= 10000) {
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| 188 | q = r + '0';
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| 189 | r = (r * (uint64_t)0x1999999a) >> 32;
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| 190 | *buf++ = q - 10*r;
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| 191 | }
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| 192 |
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| 193 | q = (r * 0x199a) >> 16;
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| 194 | *buf++ = (r - 10 * q) + '0';
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| 195 | if (q == 0)
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| 196 | return buf;
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| 197 | r = (q * 0xcd) >> 11;
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| 198 | *buf++ = (q - 10 * r) + '0';
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| 199 | if (r == 0)
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| 200 | return buf;
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| 201 | q = (r * 0xcd) >> 11;
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| 202 | *buf++ = (r - 10 * q) + '0';
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| 203 | if (q == 0)
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| 204 | return buf;
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| 205 | *buf++ = q + '0';
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| 206 | return buf;
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| 207 | }
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| 208 |
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| 209 | |
| 210 | * One is generic: divide by 1000000000 and repeatedly print
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| 211 | * groups of (up to) 9 digits. It's conceptually simple,
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| 212 | * but requires a (unsigned long long) / 1000000000 division.
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| 213 | *
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| 214 | * Second algorithm splits 64-bit unsigned long long into 16-bit chunks,
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| 215 | * manipulates them cleverly and generates groups of 4 decimal digits.
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| 216 | * It so happens that it does NOT require long long division.
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| 217 | *
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| 218 | * If long is > 32 bits, division of 64-bit values is relatively easy,
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| 219 | * and we will use the first algorithm.
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| 220 | * If long long is > 64 bits (strange architecture with VERY large long long),
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| 221 | * second algorithm can't be used, and we again use the first one.
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| 222 | *
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| 223 | * Else (if long is 32 bits and long long is 64 bits) we use second one.
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| 224 |
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| 225 |
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| 226 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64
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| 227 |
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| 228 |
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| 229 |
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| 230 | static
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| 231 | char *put_dec(char *buf, unsigned long long n)
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| 232 | {
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| 233 | if (n >= 100*1000*1000) {
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| 234 | while (n >= 1000*1000*1000)
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| 235 | buf = put_dec_full9(buf, do_div(n, 1000*1000*1000));
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| 236 | if (n >= 100*1000*1000)
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| 237 | return put_dec_full9(buf, n);
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| 238 | }
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| 239 | return put_dec_trunc8(buf, n);
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| 240 | }
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| 241 |
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| 242 | #else
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| 243 |
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| 244 |
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| 245 |
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| 246 |
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| 247 | static noinline_for_stack
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| 248 | void put_dec_full4(char *buf, unsigned q)
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| 249 | {
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| 250 | unsigned r;
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| 251 | r = (q * 0xccd) >> 15;
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| 252 | buf[0] = (q - 10 * r) + '0';
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| 253 | q = (r * 0xcd) >> 11;
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| 254 | buf[1] = (r - 10 * q) + '0';
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| 255 | r = (q * 0xcd) >> 11;
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| 256 | buf[2] = (q - 10 * r) + '0';
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| 257 | buf[3] = r + '0';
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| 258 | }
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| 259 |
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| 260 | |
| 261 | * Call put_dec_full4 on x % 10000, return x / 10000.
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| 262 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43
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| 263 | * holds for all x < 1,128,869,999. The largest value this
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| 264 | * helper will ever be asked to convert is 1,125,520,955.
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| 265 | * (d1 in the put_dec code, assuming n is all-ones).
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| 266 |
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| 267 | static
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| 268 | unsigned put_dec_helper4(char *buf, unsigned x)
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| 269 | {
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| 270 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
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| 271 |
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| 272 | put_dec_full4(buf, x - q * 10000);
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| 273 | return q;
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| 274 | }
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| 275 |
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| 276 | |
| 277 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
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| 278 | * (with permission from the author).
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| 279 | * Performs no 64-bit division and hence should be fast on 32-bit machines.
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| 280 |
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| 281 | static
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| 282 | char *put_dec(char *buf, unsigned long long n)
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| 283 | {
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| 284 | uint32_t d3, d2, d1, q, h;
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| 285 |
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| 286 | if (n < 100*1000*1000)
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| 287 | return put_dec_trunc8(buf, n);
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| 288 |
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| 289 | d1 = ((uint32_t)n >> 16);
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| 290 | h = (n >> 32);
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| 291 | d2 = (h ) & 0xffff;
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| 292 | d3 = (h >> 16);
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| 293 |
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| 294 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
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| 295 | q = put_dec_helper4(buf, q);
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| 296 |
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| 297 | q += 7671 * d3 + 9496 * d2 + 6 * d1;
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| 298 | q = put_dec_helper4(buf+4, q);
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| 299 |
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| 300 | q += 4749 * d3 + 42 * d2;
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| 301 | q = put_dec_helper4(buf+8, q);
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| 302 |
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| 303 | q += 281 * d3;
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| 304 | buf += 12;
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| 305 | if (q)
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| 306 | buf = put_dec_trunc8(buf, q);
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| 307 | else while (buf[-1] == '0')
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| 308 | --buf;
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| 309 |
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| 310 | return buf;
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| 311 | }
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| 312 |
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| 313 | #endif
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| 314 |
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| 315 | |
| 316 | * Convert passed number to decimal string.
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| 317 | * Returns the length of string. On buffer overflow, returns 0.
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| 318 | *
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| 319 | * If speed is not important, use snprintf(). It's easy to read the code.
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| 320 |
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| 321 | int num_to_str(char *buf, int size, unsigned long long num)
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| 322 | {
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| 323 | char tmp[sizeof(num) * 3];
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| 324 | int idx, len;
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| 325 |
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| 326 |
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| 327 | if (num <= 9) {
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| 328 | tmp[0] = '0' + num;
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| 329 | len = 1;
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| 330 | } else {
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| 331 | len = put_dec(tmp, num) - tmp;
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| 332 | }
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| 333 |
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| 334 | if (len > size)
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| 335 | return 0;
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| 336 | for (idx = 0; idx < len; ++idx)
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| 337 | buf[idx] = tmp[len - idx - 1];
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| 338 | return len;
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| 339 | }
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| 340 |
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| 341 | #define ZEROPAD 1
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| 342 | #define SIGN 2
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| 343 | #define PLUS 4
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| 344 | #define SPACE 8
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| 345 | #define LEFT 16
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| 346 | #define SMALL 32
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| 347 | #define SPECIAL 64
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| 348 |
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| 349 | enum format_type {
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| 350 | FORMAT_TYPE_NONE,
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| 351 | FORMAT_TYPE_WIDTH,
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| 352 | FORMAT_TYPE_PRECISION,
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| 353 | FORMAT_TYPE_CHAR,
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| 354 | FORMAT_TYPE_STR,
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| 355 | FORMAT_TYPE_PTR,
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| 356 | FORMAT_TYPE_PERCENT_CHAR,
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| 357 | FORMAT_TYPE_INVALID,
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| 358 | FORMAT_TYPE_LONG_LONG,
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| 359 | FORMAT_TYPE_ULONG,
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| 360 | FORMAT_TYPE_LONG,
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| 361 | FORMAT_TYPE_UBYTE,
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| 362 | FORMAT_TYPE_BYTE,
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| 363 | FORMAT_TYPE_USHORT,
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| 364 | FORMAT_TYPE_SHORT,
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| 365 | FORMAT_TYPE_UINT,
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| 366 | FORMAT_TYPE_INT,
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| 367 | FORMAT_TYPE_NRCHARS,
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| 368 | FORMAT_TYPE_SIZE_T,
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| 369 | FORMAT_TYPE_PTRDIFF
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| 370 | };
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| 371 |
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| 372 | struct printf_spec {
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| 373 | u8 type;
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| 374 | u8 flags;
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| 375 | u8 base;
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| 376 | u8 qualifier;
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| 377 | s16 field_width;
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| 378 | s16 precision;
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| 379 | };
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| 380 |
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| 381 | static noinline_for_stack
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| 382 | char *number(char *buf, char *end, unsigned long long num,
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| 383 | struct printf_spec spec)
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| 384 | {
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| 385 |
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| 386 | static const char digits[16] = "0123456789ABCDEF";
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| 387 |
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| 388 | char tmp[66];
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| 389 | char sign;
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| 390 | char locase;
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| 391 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
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| 392 | int i;
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| 393 | bool is_zero = num == 0LL;
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| 394 |
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| 395 | |
| 396 | * produces same digits or (maybe lowercased) letters
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| 397 | locase = (spec.flags & SMALL);
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| 398 | if (spec.flags & LEFT)
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| 399 | spec.flags &= ~ZEROPAD;
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| 400 | sign = 0;
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| 401 | if (spec.flags & SIGN) {
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| 402 | if ((signed long long)num < 0) {
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| 403 | sign = '-';
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| 404 | num = -(signed long long)num;
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| 405 | spec.field_width--;
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| 406 | } else if (spec.flags & PLUS) {
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| 407 | sign = '+';
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| 408 | spec.field_width--;
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| 409 | } else if (spec.flags & SPACE) {
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| 410 | sign = ' ';
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| 411 | spec.field_width--;
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| 412 | }
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| 413 | }
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| 414 | if (need_pfx) {
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| 415 | if (spec.base == 16)
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| 416 | spec.field_width -= 2;
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| 417 | else if (!is_zero)
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| 418 | spec.field_width--;
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| 419 | }
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| 420 |
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| 421 |
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| 422 | i = 0;
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| 423 | if (num < spec.base)
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| 424 | tmp[i++] = digits[num] | locase;
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| 425 | |
| 426 | else do {
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| 427 | tmp[i++] = (digits[do_div(num,base)] | locase);
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| 428 | } while (num != 0);
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| 429 |
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| 430 | else if (spec.base != 10) {
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| 431 | int mask = spec.base - 1;
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| 432 | int shift = 3;
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| 433 |
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| 434 | if (spec.base == 16)
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| 435 | shift = 4;
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| 436 | do {
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| 437 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
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| 438 | num >>= shift;
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| 439 | } while (num);
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| 440 | } else {
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| 441 | i = put_dec(tmp, num) - tmp;
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| 442 | }
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| 443 |
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| 444 |
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| 445 | if (i > spec.precision)
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| 446 | spec.precision = i;
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| 447 |
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| 448 | spec.field_width -= spec.precision;
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| 449 | if (!(spec.flags & (ZEROPAD+LEFT))) {
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| 450 | while (--spec.field_width >= 0) {
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| 451 | if (buf < end)
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| 452 | *buf = ' ';
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| 453 | ++buf;
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| 454 | }
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| 455 | }
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| 456 |
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| 457 | if (sign) {
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| 458 | if (buf < end)
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| 459 | *buf = sign;
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| 460 | ++buf;
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| 461 | }
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| 462 |
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| 463 | if (need_pfx) {
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| 464 | if (spec.base == 16 || !is_zero) {
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| 465 | if (buf < end)
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| 466 | *buf = '0';
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| 467 | ++buf;
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| 468 | }
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| 469 | if (spec.base == 16) {
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| 470 | if (buf < end)
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| 471 | *buf = ('X' | locase);
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| 472 | ++buf;
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| 473 | }
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| 474 | }
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| 475 |
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| 476 | if (!(spec.flags & LEFT)) {
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| 477 | char c = (spec.flags & ZEROPAD) ? '0' : ' ';
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| 478 | while (--spec.field_width >= 0) {
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| 479 | if (buf < end)
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| 480 | *buf = c;
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| 481 | ++buf;
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| 482 | }
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| 483 | }
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| 484 |
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| 485 | while (i <= --spec.precision) {
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| 486 | if (buf < end)
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| 487 | *buf = '0';
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| 488 | ++buf;
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| 489 | }
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| 490 |
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| 491 | while (--i >= 0) {
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| 492 | if (buf < end)
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| 493 | *buf = tmp[i];
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| 494 | ++buf;
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| 495 | }
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| 496 |
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| 497 | while (--spec.field_width >= 0) {
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| 498 | if (buf < end)
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| 499 | *buf = ' ';
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| 500 | ++buf;
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| 501 | }
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| 502 |
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| 503 | return buf;
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| 504 | }
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| 505 |
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| 506 | static noinline_for_stack
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| 507 | char *string(char *buf, char *end, const char *s, struct printf_spec spec)
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| 508 | {
|
| 509 | int len, i;
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| 510 |
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| 511 | if ((unsigned long)s < PAGE_SIZE)
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| 512 | s = "(null)";
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| 513 |
|
| 514 | len = strnlen(s, spec.precision);
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| 515 |
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| 516 | if (!(spec.flags & LEFT)) {
|
| 517 | while (len < spec.field_width--) {
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| 518 | if (buf < end)
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| 519 | *buf = ' ';
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| 520 | ++buf;
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| 521 | }
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| 522 | }
|
| 523 | for (i = 0; i < len; ++i) {
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| 524 | if (buf < end)
|
| 525 | *buf = *s;
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| 526 | ++buf; ++s;
|
| 527 | }
|
| 528 | while (len < spec.field_width--) {
|
| 529 | if (buf < end)
|
| 530 | *buf = ' ';
|
| 531 | ++buf;
|
| 532 | }
|
| 533 |
|
| 534 | return buf;
|
| 535 | }
|
| 536 |
|
| 537 | static void widen(char *buf, char *end, unsigned len, unsigned spaces)
|
| 538 | {
|
| 539 | size_t size;
|
| 540 | if (buf >= end)
|
| 541 | return;
|
| 542 | size = end - buf;
|
| 543 | if (size <= spaces) {
|
| 544 | memset(buf, ' ', size);
|
| 545 | return;
|
| 546 | }
|
| 547 | if (len) {
|
| 548 | if (len > size - spaces)
|
| 549 | len = size - spaces;
|
| 550 | memmove(buf + spaces, buf, len);
|
| 551 | }
|
| 552 | memset(buf, ' ', spaces);
|
| 553 | }
|
| 554 |
|
| 555 | static noinline_for_stack
|
| 556 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
|
| 557 | const char *fmt)
|
| 558 | {
|
| 559 | const char *array[4], *s;
|
| 560 | const struct dentry *p;
|
| 561 | int depth;
|
| 562 | int i, n;
|
| 563 |
|
| 564 | switch (fmt[1]) {
|
| 565 | case '2': case '3': case '4':
|
| 566 | depth = fmt[1] - '0';
|
| 567 | break;
|
| 568 | default:
|
| 569 | depth = 1;
|
| 570 | }
|
| 571 |
|
| 572 | rcu_read_lock();
|
| 573 | for (i = 0; i < depth; i++, d = p) {
|
| 574 | p = ACCESS_ONCE(d->d_parent);
|
| 575 | array[i] = ACCESS_ONCE(d->d_name.name);
|
| 576 | if (p == d) {
|
| 577 | if (i)
|
| 578 | array[i] = "";
|
| 579 | i++;
|
| 580 | break;
|
| 581 | }
|
| 582 | }
|
| 583 | s = array[--i];
|
| 584 | for (n = 0; n != spec.precision; n++, buf++) {
|
| 585 | char c = *s++;
|
| 586 | if (!c) {
|
| 587 | if (!i)
|
| 588 | break;
|
| 589 | c = '/';
|
| 590 | s = array[--i];
|
| 591 | }
|
| 592 | if (buf < end)
|
| 593 | *buf = c;
|
| 594 | }
|
| 595 | rcu_read_unlock();
|
| 596 | if (n < spec.field_width) {
|
| 597 |
|
| 598 | unsigned spaces = spec.field_width - n;
|
| 599 | if (!(spec.flags & LEFT)) {
|
| 600 | widen(buf - n, end, n, spaces);
|
| 601 | return buf + spaces;
|
| 602 | }
|
| 603 | while (spaces--) {
|
| 604 | if (buf < end)
|
| 605 | *buf = ' ';
|
| 606 | ++buf;
|
| 607 | }
|
| 608 | }
|
| 609 | return buf;
|
| 610 | }
|
| 611 |
|
| 612 | static noinline_for_stack
|
| 613 | char *symbol_string(char *buf, char *end, void *ptr,
|
| 614 | struct printf_spec spec, const char *fmt)
|
| 615 | {
|
| 616 | unsigned long value;
|
| 617 | #ifdef CONFIG_KALLSYMS
|
| 618 | char sym[KSYM_SYMBOL_LEN];
|
| 619 | #endif
|
| 620 |
|
| 621 | if (fmt[1] == 'R')
|
| 622 | ptr = __builtin_extract_return_addr(ptr);
|
| 623 | value = (unsigned long)ptr;
|
| 624 |
|
| 625 | #ifdef CONFIG_KALLSYMS
|
| 626 | if (*fmt == 'B')
|
| 627 | sprint_backtrace(sym, value);
|
| 628 | else if (*fmt != 'f' && *fmt != 's')
|
| 629 | sprint_symbol(sym, value);
|
| 630 | else
|
| 631 | sprint_symbol_no_offset(sym, value);
|
| 632 |
|
| 633 | return string(buf, end, sym, spec);
|
| 634 | #else
|
| 635 | spec.field_width = 2 * sizeof(void *);
|
| 636 | spec.flags |= SPECIAL | SMALL | ZEROPAD;
|
| 637 | spec.base = 16;
|
| 638 |
|
| 639 | return number(buf, end, value, spec);
|
| 640 | #endif
|
| 641 | }
|
| 642 |
|
| 643 | static noinline_for_stack
|
| 644 | char *resource_string(char *buf, char *end, struct resource *res,
|
| 645 | struct printf_spec spec, const char *fmt)
|
| 646 | {
|
| 647 | #ifndef IO_RSRC_PRINTK_SIZE
|
| 648 | #define IO_RSRC_PRINTK_SIZE 6
|
| 649 | #endif
|
| 650 |
|
| 651 | #ifndef MEM_RSRC_PRINTK_SIZE
|
| 652 | #define MEM_RSRC_PRINTK_SIZE 10
|
| 653 | #endif
|
| 654 | static const struct printf_spec io_spec = {
|
| 655 | .base = 16,
|
| 656 | .field_width = IO_RSRC_PRINTK_SIZE,
|
| 657 | .precision = -1,
|
| 658 | .flags = SPECIAL | SMALL | ZEROPAD,
|
| 659 | };
|
| 660 | static const struct printf_spec mem_spec = {
|
| 661 | .base = 16,
|
| 662 | .field_width = MEM_RSRC_PRINTK_SIZE,
|
| 663 | .precision = -1,
|
| 664 | .flags = SPECIAL | SMALL | ZEROPAD,
|
| 665 | };
|
| 666 | static const struct printf_spec bus_spec = {
|
| 667 | .base = 16,
|
| 668 | .field_width = 2,
|
| 669 | .precision = -1,
|
| 670 | .flags = SMALL | ZEROPAD,
|
| 671 | };
|
| 672 | static const struct printf_spec dec_spec = {
|
| 673 | .base = 10,
|
| 674 | .precision = -1,
|
| 675 | .flags = 0,
|
| 676 | };
|
| 677 | static const struct printf_spec str_spec = {
|
| 678 | .field_width = -1,
|
| 679 | .precision = 10,
|
| 680 | .flags = LEFT,
|
| 681 | };
|
| 682 | static const struct printf_spec flag_spec = {
|
| 683 | .base = 16,
|
| 684 | .precision = -1,
|
| 685 | .flags = SPECIAL | SMALL,
|
| 686 | };
|
| 687 |
|
| 688 | |
| 689 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16)
|
| 690 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
|
| 691 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
|
| 692 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
|
| 693 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
|
| 694 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
|
| 695 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
|
| 696 |
|
| 697 | char *p = sym, *pend = sym + sizeof(sym);
|
| 698 | int decode = (fmt[0] == 'R') ? 1 : 0;
|
| 699 | const struct printf_spec *specp;
|
| 700 |
|
| 701 | *p++ = '[';
|
| 702 | if (res->flags & IORESOURCE_IO) {
|
| 703 | p = string(p, pend, "io ", str_spec);
|
| 704 | specp = &io_spec;
|
| 705 | } else if (res->flags & IORESOURCE_MEM) {
|
| 706 | p = string(p, pend, "mem ", str_spec);
|
| 707 | specp = &mem_spec;
|
| 708 | } else if (res->flags & IORESOURCE_IRQ) {
|
| 709 | p = string(p, pend, "irq ", str_spec);
|
| 710 | specp = &dec_spec;
|
| 711 | } else if (res->flags & IORESOURCE_DMA) {
|
| 712 | p = string(p, pend, "dma ", str_spec);
|
| 713 | specp = &dec_spec;
|
| 714 | } else if (res->flags & IORESOURCE_BUS) {
|
| 715 | p = string(p, pend, "bus ", str_spec);
|
| 716 | specp = &bus_spec;
|
| 717 | } else {
|
| 718 | p = string(p, pend, "??? ", str_spec);
|
| 719 | specp = &mem_spec;
|
| 720 | decode = 0;
|
| 721 | }
|
| 722 | p = number(p, pend, res->start, *specp);
|
| 723 | if (res->start != res->end) {
|
| 724 | *p++ = '-';
|
| 725 | p = number(p, pend, res->end, *specp);
|
| 726 | }
|
| 727 | if (decode) {
|
| 728 | if (res->flags & IORESOURCE_MEM_64)
|
| 729 | p = string(p, pend, " 64bit", str_spec);
|
| 730 | if (res->flags & IORESOURCE_PREFETCH)
|
| 731 | p = string(p, pend, " pref", str_spec);
|
| 732 | if (res->flags & IORESOURCE_WINDOW)
|
| 733 | p = string(p, pend, " window", str_spec);
|
| 734 | if (res->flags & IORESOURCE_DISABLED)
|
| 735 | p = string(p, pend, " disabled", str_spec);
|
| 736 | } else {
|
| 737 | p = string(p, pend, " flags ", str_spec);
|
| 738 | p = number(p, pend, res->flags, flag_spec);
|
| 739 | }
|
| 740 | *p++ = ']';
|
| 741 | *p = '\0';
|
| 742 |
|
| 743 | return string(buf, end, sym, spec);
|
| 744 | }
|
| 745 |
|
| 746 | static noinline_for_stack
|
| 747 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
|
| 748 | const char *fmt)
|
| 749 | {
|
| 750 | int i, len = 1; |
| 751 | negative value, fallback to the default
|
| 752 | char separator;
|
| 753 |
|
| 754 | if (spec.field_width == 0)
|
| 755 |
|
| 756 | return buf;
|
| 757 |
|
| 758 | if (ZERO_OR_NULL_PTR(addr))
|
| 759 |
|
| 760 | return string(buf, end, NULL, spec);
|
| 761 |
|
| 762 | switch (fmt[1]) {
|
| 763 | case 'C':
|
| 764 | separator = ':';
|
| 765 | break;
|
| 766 | case 'D':
|
| 767 | separator = '-';
|
| 768 | break;
|
| 769 | case 'N':
|
| 770 | separator = 0;
|
| 771 | break;
|
| 772 | default:
|
| 773 | separator = ' ';
|
| 774 | break;
|
| 775 | }
|
| 776 |
|
| 777 | if (spec.field_width > 0)
|
| 778 | len = min_t(int, spec.field_width, 64);
|
| 779 |
|
| 780 | for (i = 0; i < len && buf < end - 1; i++) {
|
| 781 | buf = hex_byte_pack(buf, addr[i]);
|
| 782 |
|
| 783 | if (buf < end && separator && i != len - 1)
|
| 784 | *buf++ = separator;
|
| 785 | }
|
| 786 |
|
| 787 | return buf;
|
| 788 | }
|
| 789 |
|
| 790 | static noinline_for_stack
|
| 791 | char *mac_address_string(char *buf, char *end, u8 *addr,
|
| 792 | struct printf_spec spec, const char *fmt)
|
| 793 | {
|
| 794 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
|
| 795 | char *p = mac_addr;
|
| 796 | int i;
|
| 797 | char separator;
|
| 798 | bool reversed = false;
|
| 799 |
|
| 800 | switch (fmt[1]) {
|
| 801 | case 'F':
|
| 802 | separator = '-';
|
| 803 | break;
|
| 804 |
|
| 805 | case 'R':
|
| 806 | reversed = true;
|
| 807 |
|
| 808 |
|
| 809 | default:
|
| 810 | separator = ':';
|
| 811 | break;
|
| 812 | }
|
| 813 |
|
| 814 | for (i = 0; i < 6; i++) {
|
| 815 | if (reversed)
|
| 816 | p = hex_byte_pack(p, addr[5 - i]);
|
| 817 | else
|
| 818 | p = hex_byte_pack(p, addr[i]);
|
| 819 |
|
| 820 | if (fmt[0] == 'M' && i != 5)
|
| 821 | *p++ = separator;
|
| 822 | }
|
| 823 | *p = '\0';
|
| 824 |
|
| 825 | return string(buf, end, mac_addr, spec);
|
| 826 | }
|
| 827 |
|
| 828 | static noinline_for_stack
|
| 829 | char *ip4_string(char *p, const u8 *addr, const char *fmt)
|
| 830 | {
|
| 831 | int i;
|
| 832 | bool leading_zeros = (fmt[0] == 'i');
|
| 833 | int index;
|
| 834 | int step;
|
| 835 |
|
| 836 | switch (fmt[2]) {
|
| 837 | case 'h':
|
| 838 | #ifdef __BIG_ENDIAN
|
| 839 | index = 0;
|
| 840 | step = 1;
|
| 841 | #else
|
| 842 | index = 3;
|
| 843 | step = -1;
|
| 844 | #endif
|
| 845 | break;
|
| 846 | case 'l':
|
| 847 | index = 3;
|
| 848 | step = -1;
|
| 849 | break;
|
| 850 | case 'n':
|
| 851 | case 'b':
|
| 852 | default:
|
| 853 | index = 0;
|
| 854 | step = 1;
|
| 855 | break;
|
| 856 | }
|
| 857 | for (i = 0; i < 4; i++) {
|
| 858 | char temp[3];
|
| 859 | int digits = put_dec_trunc8(temp, addr[index]) - temp;
|
| 860 | if (leading_zeros) {
|
| 861 | if (digits < 3)
|
| 862 | *p++ = '0';
|
| 863 | if (digits < 2)
|
| 864 | *p++ = '0';
|
| 865 | }
|
| 866 |
|
| 867 | while (digits--)
|
| 868 | *p++ = temp[digits];
|
| 869 | if (i < 3)
|
| 870 | *p++ = '.';
|
| 871 | index += step;
|
| 872 | }
|
| 873 | *p = '\0';
|
| 874 |
|
| 875 | return p;
|
| 876 | }
|
| 877 |
|
| 878 | static noinline_for_stack
|
| 879 | char *ip6_compressed_string(char *p, const char *addr)
|
| 880 | {
|
| 881 | int i, j, range;
|
| 882 | unsigned char zerolength[8];
|
| 883 | int longest = 1;
|
| 884 | int colonpos = -1;
|
| 885 | u16 word;
|
| 886 | u8 hi, lo;
|
| 887 | bool needcolon = false;
|
| 888 | bool useIPv4;
|
| 889 | struct in6_addr in6;
|
| 890 |
|
| 891 | memcpy(&in6, addr, sizeof(struct in6_addr));
|
| 892 |
|
| 893 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
|
| 894 |
|
| 895 | memset(zerolength, 0, sizeof(zerolength));
|
| 896 |
|
| 897 | if (useIPv4)
|
| 898 | range = 6;
|
| 899 | else
|
| 900 | range = 8;
|
| 901 |
|
| 902 |
|
| 903 | for (i = 0; i < range; i++) {
|
| 904 | for (j = i; j < range; j++) {
|
| 905 | if (in6.s6_addr16[j] != 0)
|
| 906 | break;
|
| 907 | zerolength[i]++;
|
| 908 | }
|
| 909 | }
|
| 910 | for (i = 0; i < range; i++) {
|
| 911 | if (zerolength[i] > longest) {
|
| 912 | longest = zerolength[i];
|
| 913 | colonpos = i;
|
| 914 | }
|
| 915 | }
|
| 916 | if (longest == 1)
|
| 917 | colonpos = -1;
|
| 918 |
|
| 919 |
|
| 920 | for (i = 0; i < range; i++) {
|
| 921 | if (i == colonpos) {
|
| 922 | if (needcolon || i == 0)
|
| 923 | *p++ = ':';
|
| 924 | *p++ = ':';
|
| 925 | needcolon = false;
|
| 926 | i += longest - 1;
|
| 927 | continue;
|
| 928 | }
|
| 929 | if (needcolon) {
|
| 930 | *p++ = ':';
|
| 931 | needcolon = false;
|
| 932 | }
|
| 933 |
|
| 934 | word = ntohs(in6.s6_addr16[i]);
|
| 935 | hi = word >> 8;
|
| 936 | lo = word & 0xff;
|
| 937 | if (hi) {
|
| 938 | if (hi > 0x0f)
|
| 939 | p = hex_byte_pack(p, hi);
|
| 940 | else
|
| 941 | *p++ = hex_asc_lo(hi);
|
| 942 | p = hex_byte_pack(p, lo);
|
| 943 | }
|
| 944 | else if (lo > 0x0f)
|
| 945 | p = hex_byte_pack(p, lo);
|
| 946 | else
|
| 947 | *p++ = hex_asc_lo(lo);
|
| 948 | needcolon = true;
|
| 949 | }
|
| 950 |
|
| 951 | if (useIPv4) {
|
| 952 | if (needcolon)
|
| 953 | *p++ = ':';
|
| 954 | p = ip4_string(p, &in6.s6_addr[12], "I4");
|
| 955 | }
|
| 956 | *p = '\0';
|
| 957 |
|
| 958 | return p;
|
| 959 | }
|
| 960 |
|
| 961 | static noinline_for_stack
|
| 962 | char *ip6_string(char *p, const char *addr, const char *fmt)
|
| 963 | {
|
| 964 | int i;
|
| 965 |
|
| 966 | for (i = 0; i < 8; i++) {
|
| 967 | p = hex_byte_pack(p, *addr++);
|
| 968 | p = hex_byte_pack(p, *addr++);
|
| 969 | if (fmt[0] == 'I' && i != 7)
|
| 970 | *p++ = ':';
|
| 971 | }
|
| 972 | *p = '\0';
|
| 973 |
|
| 974 | return p;
|
| 975 | }
|
| 976 |
|
| 977 | static noinline_for_stack
|
| 978 | char *ip6_addr_string(char *buf, char *end, const u8 *addr,
|
| 979 | struct printf_spec spec, const char *fmt)
|
| 980 | {
|
| 981 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
|
| 982 |
|
| 983 | if (fmt[0] == 'I' && fmt[2] == 'c')
|
| 984 | ip6_compressed_string(ip6_addr, addr);
|
| 985 | else
|
| 986 | ip6_string(ip6_addr, addr, fmt);
|
| 987 |
|
| 988 | return string(buf, end, ip6_addr, spec);
|
| 989 | }
|
| 990 |
|
| 991 | static noinline_for_stack
|
| 992 | char *ip4_addr_string(char *buf, char *end, const u8 *addr,
|
| 993 | struct printf_spec spec, const char *fmt)
|
| 994 | {
|
| 995 | char ip4_addr[sizeof("255.255.255.255")];
|
| 996 |
|
| 997 | ip4_string(ip4_addr, addr, fmt);
|
| 998 |
|
| 999 | return string(buf, end, ip4_addr, spec);
|
| 1000 | }
|
| 1001 |
|
| 1002 | static noinline_for_stack
|
| 1003 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
|
| 1004 | struct printf_spec spec, const char *fmt)
|
| 1005 | {
|
| 1006 | bool have_p = false, have_s = false, have_f = false, have_c = false;
|
| 1007 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
|
| 1008 | sizeof(":12345") + sizeof("/123456789") +
|
| 1009 | sizeof("%1234567890")];
|
| 1010 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
|
| 1011 | const u8 *addr = (const u8 *) &sa->sin6_addr;
|
| 1012 | char fmt6[2] = { fmt[0], '6' };
|
| 1013 | u8 off = 0;
|
| 1014 |
|
| 1015 | fmt++;
|
| 1016 | while (isalpha(*++fmt)) {
|
| 1017 | switch (*fmt) {
|
| 1018 | case 'p':
|
| 1019 | have_p = true;
|
| 1020 | break;
|
| 1021 | case 'f':
|
| 1022 | have_f = true;
|
| 1023 | break;
|
| 1024 | case 's':
|
| 1025 | have_s = true;
|
| 1026 | break;
|
| 1027 | case 'c':
|
| 1028 | have_c = true;
|
| 1029 | break;
|
| 1030 | }
|
| 1031 | }
|
| 1032 |
|
| 1033 | if (have_p || have_s || have_f) {
|
| 1034 | *p = '[';
|
| 1035 | off = 1;
|
| 1036 | }
|
| 1037 |
|
| 1038 | if (fmt6[0] == 'I' && have_c)
|
| 1039 | p = ip6_compressed_string(ip6_addr + off, addr);
|
| 1040 | else
|
| 1041 | p = ip6_string(ip6_addr + off, addr, fmt6);
|
| 1042 |
|
| 1043 | if (have_p || have_s || have_f)
|
| 1044 | *p++ = ']';
|
| 1045 |
|
| 1046 | if (have_p) {
|
| 1047 | *p++ = ':';
|
| 1048 | p = number(p, pend, ntohs(sa->sin6_port), spec);
|
| 1049 | }
|
| 1050 | if (have_f) {
|
| 1051 | *p++ = '/';
|
| 1052 | p = number(p, pend, ntohl(sa->sin6_flowinfo &
|
| 1053 | IPV6_FLOWINFO_MASK), spec);
|
| 1054 | }
|
| 1055 | if (have_s) {
|
| 1056 | *p++ = '%';
|
| 1057 | p = number(p, pend, sa->sin6_scope_id, spec);
|
| 1058 | }
|
| 1059 | *p = '\0';
|
| 1060 |
|
| 1061 | return string(buf, end, ip6_addr, spec);
|
| 1062 | }
|
| 1063 |
|
| 1064 | static noinline_for_stack
|
| 1065 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
|
| 1066 | struct printf_spec spec, const char *fmt)
|
| 1067 | {
|
| 1068 | bool have_p = false;
|
| 1069 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
|
| 1070 | char *pend = ip4_addr + sizeof(ip4_addr);
|
| 1071 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
|
| 1072 | char fmt4[3] = { fmt[0], '4', 0 };
|
| 1073 |
|
| 1074 | fmt++;
|
| 1075 | while (isalpha(*++fmt)) {
|
| 1076 | switch (*fmt) {
|
| 1077 | case 'p':
|
| 1078 | have_p = true;
|
| 1079 | break;
|
| 1080 | case 'h':
|
| 1081 | case 'l':
|
| 1082 | case 'n':
|
| 1083 | case 'b':
|
| 1084 | fmt4[2] = *fmt;
|
| 1085 | break;
|
| 1086 | }
|
| 1087 | }
|
| 1088 |
|
| 1089 | p = ip4_string(ip4_addr, addr, fmt4);
|
| 1090 | if (have_p) {
|
| 1091 | *p++ = ':';
|
| 1092 | p = number(p, pend, ntohs(sa->sin_port), spec);
|
| 1093 | }
|
| 1094 | *p = '\0';
|
| 1095 |
|
| 1096 | return string(buf, end, ip4_addr, spec);
|
| 1097 | }
|
| 1098 |
|
| 1099 | static noinline_for_stack
|
| 1100 | char *uuid_string(char *buf, char *end, const u8 *addr,
|
| 1101 | struct printf_spec spec, const char *fmt)
|
| 1102 | {
|
| 1103 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
|
| 1104 | char *p = uuid;
|
| 1105 | int i;
|
| 1106 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
|
| 1107 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
|
| 1108 | const u8 *index = be;
|
| 1109 | bool uc = false;
|
| 1110 |
|
| 1111 | switch (*(++fmt)) {
|
| 1112 | case 'L':
|
| 1113 | uc = true;
|
| 1114 | case 'l':
|
| 1115 | index = le;
|
| 1116 | break;
|
| 1117 | case 'B':
|
| 1118 | uc = true;
|
| 1119 | break;
|
| 1120 | }
|
| 1121 |
|
| 1122 | for (i = 0; i < 16; i++) {
|
| 1123 | p = hex_byte_pack(p, addr[index[i]]);
|
| 1124 | switch (i) {
|
| 1125 | case 3:
|
| 1126 | case 5:
|
| 1127 | case 7:
|
| 1128 | case 9:
|
| 1129 | *p++ = '-';
|
| 1130 | break;
|
| 1131 | }
|
| 1132 | }
|
| 1133 |
|
| 1134 | *p = 0;
|
| 1135 |
|
| 1136 | if (uc) {
|
| 1137 | p = uuid;
|
| 1138 | do {
|
| 1139 | *p = toupper(*p);
|
| 1140 | } while (*(++p));
|
| 1141 | }
|
| 1142 |
|
| 1143 | return string(buf, end, uuid, spec);
|
| 1144 | }
|
| 1145 |
|
| 1146 | static
|
| 1147 | char *netdev_feature_string(char *buf, char *end, const u8 *addr,
|
| 1148 | struct printf_spec spec)
|
| 1149 | {
|
| 1150 | spec.flags |= SPECIAL | SMALL | ZEROPAD;
|
| 1151 | if (spec.field_width == -1)
|
| 1152 | spec.field_width = 2 + 2 * sizeof(netdev_features_t);
|
| 1153 | spec.base = 16;
|
| 1154 |
|
| 1155 | return number(buf, end, *(const netdev_features_t *)addr, spec);
|
| 1156 | }
|
| 1157 |
|
| 1158 | int kptr_restrict __read_mostly;
|
| 1159 |
|
| 1160 | |
| 1161 | * Show a '%p' thing. A kernel extension is that the '%p' is followed
|
| 1162 | * by an extra set of alphanumeric characters that are extended format
|
| 1163 | * specifiers.
|
| 1164 | *
|
| 1165 | * Right now we handle:
|
| 1166 | *
|
| 1167 | * - 'F' For symbolic function descriptor pointers with offset
|
| 1168 | * - 'f' For simple symbolic function names without offset
|
| 1169 | * - 'S' For symbolic direct pointers with offset
|
| 1170 | * - 's' For symbolic direct pointers without offset
|
| 1171 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
|
| 1172 | * - 'B' For backtraced symbolic direct pointers with offset
|
| 1173 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
|
| 1174 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
|
| 1175 | * - 'M' For a 6-byte MAC address, it prints the address in the
|
| 1176 | * usual colon-separated hex notation
|
| 1177 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons
|
| 1178 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address
|
| 1179 | * with a dash-separated hex notation
|
| 1180 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
|
| 1181 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
|
| 1182 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
|
| 1183 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's
|
| 1184 | * [S][pfs]
|
| 1185 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
|
| 1186 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
|
| 1187 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses
|
| 1188 | * IPv6 omits the colons (01020304...0f)
|
| 1189 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
|
| 1190 | * [S][pfs]
|
| 1191 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
|
| 1192 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
|
| 1193 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
|
| 1194 | * - 'I[6S]c' for IPv6 addresses printed as specified by
|
| 1195 | * http://tools.ietf.org/html/rfc5952
|
| 1196 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
|
| 1197 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
|
| 1198 | * Options for %pU are:
|
| 1199 | * b big endian lower case hex (default)
|
| 1200 | * B big endian UPPER case hex
|
| 1201 | * l little endian lower case hex
|
| 1202 | * L little endian UPPER case hex
|
| 1203 | * big endian output byte order is:
|
| 1204 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
|
| 1205 | * little endian output byte order is:
|
| 1206 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
|
| 1207 | * - 'V' For a struct va_format which contains a format string * and va_list *,
|
| 1208 | * call vsnprintf(->format, *->va_list).
|
| 1209 | * Implements a "recursive vsnprintf".
|
| 1210 | * Do not use this feature without some mechanism to verify the
|
| 1211 | * correctness of the format string and va_list arguments.
|
| 1212 | * - 'K' For a kernel pointer that should be hidden from unprivileged users
|
| 1213 | * - 'NF' For a netdev_features_t
|
| 1214 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
|
| 1215 | * a certain separator (' ' by default):
|
| 1216 | * C colon
|
| 1217 | * D dash
|
| 1218 | * N no separator
|
| 1219 | * The maximum supported length is 64 bytes of the input. Consider
|
| 1220 | * to use print_hex_dump() for the larger input.
|
| 1221 | * - 'a' For a phys_addr_t type and its derivative types (passed by reference)
|
| 1222 | * - 'd[234]' For a dentry name (optionally 2-4 last components)
|
| 1223 | * - 'D[234]' Same as 'd' but for a struct file
|
| 1224 | *
|
| 1225 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
|
| 1226 | * function pointers are really function descriptors, which contain a
|
| 1227 | * pointer to the real address.
|
| 1228 |
|
| 1229 | static noinline_for_stack
|
| 1230 | char *pointer(const char *fmt, char *buf, char *end, void *ptr,
|
| 1231 | struct printf_spec spec)
|
| 1232 | {
|
| 1233 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0);
|
| 1234 |
|
| 1235 | if (!ptr && *fmt != 'K') {
|
| 1236 | |
| 1237 | * Print (null) with the same width as a pointer so it makes
|
| 1238 | * tabular output look nice.
|
| 1239 |
|
| 1240 | if (spec.field_width == -1)
|
| 1241 | spec.field_width = default_width;
|
| 1242 | return string(buf, end, "(null)", spec);
|
| 1243 | }
|
| 1244 |
|
| 1245 | switch (*fmt) {
|
| 1246 | case 'F':
|
| 1247 | case 'f':
|
| 1248 | ptr = dereference_function_descriptor(ptr);
|
| 1249 |
|
| 1250 | case 'S':
|
| 1251 | case 's':
|
| 1252 | case 'B':
|
| 1253 | return symbol_string(buf, end, ptr, spec, fmt);
|
| 1254 | case 'R':
|
| 1255 | case 'r':
|
| 1256 | return resource_string(buf, end, ptr, spec, fmt);
|
| 1257 | case 'h':
|
| 1258 | return hex_string(buf, end, ptr, spec, fmt);
|
| 1259 | case 'M':
|
| 1260 | case 'm':
|
| 1261 |
|
| 1262 |
|
| 1263 | return mac_address_string(buf, end, ptr, spec, fmt);
|
| 1264 | case 'I': |
| 1265 | * 4: 1.2.3.4
|
| 1266 | * 6: 0001:0203:...:0708
|
| 1267 | * 6c: 1::708 or 1::1.2.3.4
|
| 1268 |
|
| 1269 | case 'i': |
| 1270 | * 4: 001.002.003.004
|
| 1271 | * 6: 000102...0f
|
| 1272 |
|
| 1273 | switch (fmt[1]) {
|
| 1274 | case '6':
|
| 1275 | return ip6_addr_string(buf, end, ptr, spec, fmt);
|
| 1276 | case '4':
|
| 1277 | return ip4_addr_string(buf, end, ptr, spec, fmt);
|
| 1278 | case 'S': {
|
| 1279 | const union {
|
| 1280 | struct sockaddr raw;
|
| 1281 | struct sockaddr_in v4;
|
| 1282 | struct sockaddr_in6 v6;
|
| 1283 | } *sa = ptr;
|
| 1284 |
|
| 1285 | switch (sa->raw.sa_family) {
|
| 1286 | case AF_INET:
|
| 1287 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
|
| 1288 | case AF_INET6:
|
| 1289 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
|
| 1290 | default:
|
| 1291 | return string(buf, end, "(invalid address)", spec);
|
| 1292 | }}
|
| 1293 | }
|
| 1294 | break;
|
| 1295 | case 'U':
|
| 1296 | return uuid_string(buf, end, ptr, spec, fmt);
|
| 1297 | case 'V':
|
| 1298 | {
|
| 1299 | va_list va;
|
| 1300 |
|
| 1301 | va_copy(va, *((struct va_format *)ptr)->va);
|
| 1302 | buf += vsnprintf(buf, end > buf ? end - buf : 0,
|
| 1303 | ((struct va_format *)ptr)->fmt, va);
|
| 1304 | va_end(va);
|
| 1305 | return buf;
|
| 1306 | }
|
| 1307 | case 'K':
|
| 1308 | |
| 1309 | * %pK cannot be used in IRQ context because its test
|
| 1310 | * for CAP_SYSLOG would be meaningless.
|
| 1311 |
|
| 1312 | if (kptr_restrict && (in_irq() || in_serving_softirq() ||
|
| 1313 | in_nmi())) {
|
| 1314 | if (spec.field_width == -1)
|
| 1315 | spec.field_width = default_width;
|
| 1316 | return string(buf, end, "pK-error", spec);
|
| 1317 | }
|
| 1318 |
|
| 1319 | switch (kptr_restrict) {
|
| 1320 | case 0:
|
| 1321 |
|
| 1322 | break;
|
| 1323 | case 1: {
|
| 1324 | |
| 1325 | * Only print the real pointer value if the current
|
| 1326 | * process has CAP_SYSLOG and is running with the
|
| 1327 | * same credentials it started with. This is because
|
| 1328 | * access to files is checked at open() time, but %pK
|
| 1329 | * checks permission at read() time. We don't want to
|
| 1330 | * leak pointer values if a binary opens a file using
|
| 1331 | * %pK and then elevates privileges before reading it.
|
| 1332 |
|
| 1333 | const struct cred *cred = current_cred();
|
| 1334 |
|
| 1335 | if (!has_capability_noaudit(current, CAP_SYSLOG) ||
|
| 1336 | !uid_eq(cred->euid, cred->uid) ||
|
| 1337 | !gid_eq(cred->egid, cred->gid))
|
| 1338 | ptr = NULL;
|
| 1339 | break;
|
| 1340 | }
|
| 1341 | case 2:
|
| 1342 | default:
|
| 1343 |
|
| 1344 | ptr = NULL;
|
| 1345 | break;
|
| 1346 | }
|
| 1347 | break;
|
| 1348 |
|
| 1349 | case 'N':
|
| 1350 | switch (fmt[1]) {
|
| 1351 | case 'F':
|
| 1352 | return netdev_feature_string(buf, end, ptr, spec);
|
| 1353 | }
|
| 1354 | break;
|
| 1355 | case 'a':
|
| 1356 | spec.flags |= SPECIAL | SMALL | ZEROPAD;
|
| 1357 | spec.field_width = sizeof(phys_addr_t) * 2 + 2;
|
| 1358 | spec.base = 16;
|
| 1359 | return number(buf, end,
|
| 1360 | (unsigned long long) *((phys_addr_t *)ptr), spec);
|
| 1361 | case 'd':
|
| 1362 | return dentry_name(buf, end, ptr, spec, fmt);
|
| 1363 | case 'D':
|
| 1364 | return dentry_name(buf, end,
|
| 1365 | ((const struct file *)ptr)->f_path.dentry,
|
| 1366 | spec, fmt);
|
| 1367 | }
|
| 1368 | spec.flags |= SMALL;
|
| 1369 | if (spec.field_width == -1) {
|
| 1370 | spec.field_width = default_width;
|
| 1371 | spec.flags |= ZEROPAD;
|
| 1372 | }
|
| 1373 | spec.base = 16;
|
| 1374 |
|
| 1375 | return number(buf, end, (unsigned long) ptr, spec);
|
| 1376 | }
|
| 1377 |
|
| 1378 | |
| 1379 | * Helper function to decode printf style format.
|
| 1380 | * Each call decode a token from the format and return the
|
| 1381 | * number of characters read (or likely the delta where it wants
|
| 1382 | * to go on the next call).
|
| 1383 | * The decoded token is returned through the parameters
|
| 1384 | *
|
| 1385 | * 'h', 'l', or 'L' for integer fields
|
| 1386 | * 'z' support added 23/7/1999 S.H.
|
| 1387 | * 'z' changed to 'Z' --davidm 1/25/99
|
| 1388 | * 't' added for ptrdiff_t
|
| 1389 | *
|
| 1390 | * @fmt: the format string
|
| 1391 | * @type of the token returned
|
| 1392 | * @flags: various flags such as +, -, # tokens..
|
| 1393 | * @field_width: overwritten width
|
| 1394 | * @base: base of the number (octal, hex, ...)
|
| 1395 | * @precision: precision of a number
|
| 1396 | * @qualifier: qualifier of a number (long, size_t, ...)
|
| 1397 |
|
| 1398 | static noinline_for_stack
|
| 1399 | int format_decode(const char *fmt, struct printf_spec *spec)
|
| 1400 | {
|
| 1401 | const char *start = fmt;
|
| 1402 |
|
| 1403 |
|
| 1404 | if (spec->type == FORMAT_TYPE_WIDTH) {
|
| 1405 | if (spec->field_width < 0) {
|
| 1406 | spec->field_width = -spec->field_width;
|
| 1407 | spec->flags |= LEFT;
|
| 1408 | }
|
| 1409 | spec->type = FORMAT_TYPE_NONE;
|
| 1410 | goto precision;
|
| 1411 | }
|
| 1412 |
|
| 1413 |
|
| 1414 | if (spec->type == FORMAT_TYPE_PRECISION) {
|
| 1415 | if (spec->precision < 0)
|
| 1416 | spec->precision = 0;
|
| 1417 |
|
| 1418 | spec->type = FORMAT_TYPE_NONE;
|
| 1419 | goto qualifier;
|
| 1420 | }
|
| 1421 |
|
| 1422 |
|
| 1423 | spec->type = FORMAT_TYPE_NONE;
|
| 1424 |
|
| 1425 | for (; *fmt ; ++fmt) {
|
| 1426 | if (*fmt == '%')
|
| 1427 | break;
|
| 1428 | }
|
| 1429 |
|
| 1430 |
|
| 1431 | if (fmt != start || !*fmt)
|
| 1432 | return fmt - start;
|
| 1433 |
|
| 1434 |
|
| 1435 | spec->flags = 0;
|
| 1436 |
|
| 1437 | while (1) {
|
| 1438 | bool found = true;
|
| 1439 |
|
| 1440 | ++fmt;
|
| 1441 |
|
| 1442 | switch (*fmt) {
|
| 1443 | case '-': spec->flags |= LEFT; break;
|
| 1444 | case '+': spec->flags |= PLUS; break;
|
| 1445 | case ' ': spec->flags |= SPACE; break;
|
| 1446 | case '#': spec->flags |= SPECIAL; break;
|
| 1447 | case '0': spec->flags |= ZEROPAD; break;
|
| 1448 | default: found = false;
|
| 1449 | }
|
| 1450 |
|
| 1451 | if (!found)
|
| 1452 | break;
|
| 1453 | }
|
| 1454 |
|
| 1455 |
|
| 1456 | spec->field_width = -1;
|
| 1457 |
|
| 1458 | if (isdigit(*fmt))
|
| 1459 | spec->field_width = skip_atoi(&fmt);
|
| 1460 | else if (*fmt == '*') {
|
| 1461 |
|
| 1462 | spec->type = FORMAT_TYPE_WIDTH;
|
| 1463 | return ++fmt - start;
|
| 1464 | }
|
| 1465 |
|
| 1466 | precision:
|
| 1467 |
|
| 1468 | spec->precision = -1;
|
| 1469 | if (*fmt == '.') {
|
| 1470 | ++fmt;
|
| 1471 | if (isdigit(*fmt)) {
|
| 1472 | spec->precision = skip_atoi(&fmt);
|
| 1473 | if (spec->precision < 0)
|
| 1474 | spec->precision = 0;
|
| 1475 | } else if (*fmt == '*') {
|
| 1476 |
|
| 1477 | spec->type = FORMAT_TYPE_PRECISION;
|
| 1478 | return ++fmt - start;
|
| 1479 | }
|
| 1480 | }
|
| 1481 |
|
| 1482 | qualifier:
|
| 1483 |
|
| 1484 | spec->qualifier = -1;
|
| 1485 | if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
|
| 1486 | _tolower(*fmt) == 'z' || *fmt == 't') {
|
| 1487 | spec->qualifier = *fmt++;
|
| 1488 | if (unlikely(spec->qualifier == *fmt)) {
|
| 1489 | if (spec->qualifier == 'l') {
|
| 1490 | spec->qualifier = 'L';
|
| 1491 | ++fmt;
|
| 1492 | } else if (spec->qualifier == 'h') {
|
| 1493 | spec->qualifier = 'H';
|
| 1494 | ++fmt;
|
| 1495 | }
|
| 1496 | }
|
| 1497 | }
|
| 1498 |
|
| 1499 |
|
| 1500 | spec->base = 10;
|
| 1501 | switch (*fmt) {
|
| 1502 | case 'c':
|
| 1503 | spec->type = FORMAT_TYPE_CHAR;
|
| 1504 | return ++fmt - start;
|
| 1505 |
|
| 1506 | case 's':
|
| 1507 | spec->type = FORMAT_TYPE_STR;
|
| 1508 | return ++fmt - start;
|
| 1509 |
|
| 1510 | case 'p':
|
| 1511 | spec->type = FORMAT_TYPE_PTR;
|
| 1512 | return fmt - start;
|
| 1513 |
|
| 1514 |
|
| 1515 | case 'n':
|
| 1516 | spec->type = FORMAT_TYPE_NRCHARS;
|
| 1517 | return ++fmt - start;
|
| 1518 |
|
| 1519 | case '%':
|
| 1520 | spec->type = FORMAT_TYPE_PERCENT_CHAR;
|
| 1521 | return ++fmt - start;
|
| 1522 |
|
| 1523 |
|
| 1524 | case 'o':
|
| 1525 | spec->base = 8;
|
| 1526 | break;
|
| 1527 |
|
| 1528 | case 'x':
|
| 1529 | spec->flags |= SMALL;
|
| 1530 |
|
| 1531 | case 'X':
|
| 1532 | spec->base = 16;
|
| 1533 | break;
|
| 1534 |
|
| 1535 | case 'd':
|
| 1536 | case 'i':
|
| 1537 | spec->flags |= SIGN;
|
| 1538 | case 'u':
|
| 1539 | break;
|
| 1540 |
|
| 1541 | default:
|
| 1542 | spec->type = FORMAT_TYPE_INVALID;
|
| 1543 | return fmt - start;
|
| 1544 | }
|
| 1545 |
|
| 1546 | if (spec->qualifier == 'L')
|
| 1547 | spec->type = FORMAT_TYPE_LONG_LONG;
|
| 1548 | else if (spec->qualifier == 'l') {
|
| 1549 | if (spec->flags & SIGN)
|
| 1550 | spec->type = FORMAT_TYPE_LONG;
|
| 1551 | else
|
| 1552 | spec->type = FORMAT_TYPE_ULONG;
|
| 1553 | } else if (_tolower(spec->qualifier) == 'z') {
|
| 1554 | spec->type = FORMAT_TYPE_SIZE_T;
|
| 1555 | } else if (spec->qualifier == 't') {
|
| 1556 | spec->type = FORMAT_TYPE_PTRDIFF;
|
| 1557 | } else if (spec->qualifier == 'H') {
|
| 1558 | if (spec->flags & SIGN)
|
| 1559 | spec->type = FORMAT_TYPE_BYTE;
|
| 1560 | else
|
| 1561 | spec->type = FORMAT_TYPE_UBYTE;
|
| 1562 | } else if (spec->qualifier == 'h') {
|
| 1563 | if (spec->flags & SIGN)
|
| 1564 | spec->type = FORMAT_TYPE_SHORT;
|
| 1565 | else
|
| 1566 | spec->type = FORMAT_TYPE_USHORT;
|
| 1567 | } else {
|
| 1568 | if (spec->flags & SIGN)
|
| 1569 | spec->type = FORMAT_TYPE_INT;
|
| 1570 | else
|
| 1571 | spec->type = FORMAT_TYPE_UINT;
|
| 1572 | }
|
| 1573 |
|
| 1574 | return ++fmt - start;
|
| 1575 | }
|
| 1576 |
|
| 1577 | |
| 1578 | * vsnprintf - Format a string and place it in a buffer
|
| 1579 | * @buf: The buffer to place the result into
|
| 1580 | * @size: The size of the buffer, including the trailing null space
|
| 1581 | * @fmt: The format string to use
|
| 1582 | * @args: Arguments for the format string
|
| 1583 | *
|
| 1584 | * This function follows C99 vsnprintf, but has some extensions:
|
| 1585 | * %pS output the name of a text symbol with offset
|
| 1586 | * %ps output the name of a text symbol without offset
|
| 1587 | * %pF output the name of a function pointer with its offset
|
| 1588 | * %pf output the name of a function pointer without its offset
|
| 1589 | * %pB output the name of a backtrace symbol with its offset
|
| 1590 | * %pR output the address range in a struct resource with decoded flags
|
| 1591 | * %pr output the address range in a struct resource with raw flags
|
| 1592 | * %pM output a 6-byte MAC address with colons
|
| 1593 | * %pMR output a 6-byte MAC address with colons in reversed order
|
| 1594 | * %pMF output a 6-byte MAC address with dashes
|
| 1595 | * %pm output a 6-byte MAC address without colons
|
| 1596 | * %pmR output a 6-byte MAC address without colons in reversed order
|
| 1597 | * %pI4 print an IPv4 address without leading zeros
|
| 1598 | * %pi4 print an IPv4 address with leading zeros
|
| 1599 | * %pI6 print an IPv6 address with colons
|
| 1600 | * %pi6 print an IPv6 address without colons
|
| 1601 | * %pI6c print an IPv6 address as specified by RFC 5952
|
| 1602 | * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address
|
| 1603 | * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address
|
| 1604 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
|
| 1605 | * case.
|
| 1606 | * %*ph[CDN] a variable-length hex string with a separator (supports up to 64
|
| 1607 | * bytes of the input)
|
| 1608 | * %n is ignored
|
| 1609 | *
|
| 1610 | * ** Please update Documentation/printk-formats.txt when making changes **
|
| 1611 | *
|
| 1612 | * The return value is the number of characters which would
|
| 1613 | * be generated for the given input, excluding the trailing
|
| 1614 | * '\0', as per ISO C99. If you want to have the exact
|
| 1615 | * number of characters written into @buf as return value
|
| 1616 | * (not including the trailing '\0'), use vscnprintf(). If the
|
| 1617 | * return is greater than or equal to @size, the resulting
|
| 1618 | * string is truncated.
|
| 1619 | *
|
| 1620 | * If you're not already dealing with a va_list consider using snprintf().
|
| 1621 |
|
| 1622 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
|
| 1623 | {
|
| 1624 | unsigned long long num;
|
| 1625 | char *str, *end;
|
| 1626 | struct printf_spec spec = {0};
|
| 1627 |
|
| 1628 | |
| 1629 | used for unknown buffer sizes.
|
| 1630 | if (WARN_ON_ONCE((int) size < 0))
|
| 1631 | return 0;
|
| 1632 |
|
| 1633 | str = buf;
|
| 1634 | end = buf + size;
|
| 1635 |
|
| 1636 |
|
| 1637 | if (end < buf) {
|
| 1638 | end = ((void *)-1);
|
| 1639 | size = end - buf;
|
| 1640 | }
|
| 1641 |
|
| 1642 | while (*fmt) {
|
| 1643 | const char *old_fmt = fmt;
|
| 1644 | int read = format_decode(fmt, &spec);
|
| 1645 |
|
| 1646 | fmt += read;
|
| 1647 |
|
| 1648 | switch (spec.type) {
|
| 1649 | case FORMAT_TYPE_NONE: {
|
| 1650 | int copy = read;
|
| 1651 | if (str < end) {
|
| 1652 | if (copy > end - str)
|
| 1653 | copy = end - str;
|
| 1654 | memcpy(str, old_fmt, copy);
|
| 1655 | }
|
| 1656 | str += read;
|
| 1657 | break;
|
| 1658 | }
|
| 1659 |
|
| 1660 | case FORMAT_TYPE_WIDTH:
|
| 1661 | spec.field_width = va_arg(args, int);
|
| 1662 | break;
|
| 1663 |
|
| 1664 | case FORMAT_TYPE_PRECISION:
|
| 1665 | spec.precision = va_arg(args, int);
|
| 1666 | break;
|
| 1667 |
|
| 1668 | case FORMAT_TYPE_CHAR: {
|
| 1669 | char c;
|
| 1670 |
|
| 1671 | if (!(spec.flags & LEFT)) {
|
| 1672 | while (--spec.field_width > 0) {
|
| 1673 | if (str < end)
|
| 1674 | *str = ' ';
|
| 1675 | ++str;
|
| 1676 |
|
| 1677 | }
|
| 1678 | }
|
| 1679 | c = (unsigned char) va_arg(args, int);
|
| 1680 | if (str < end)
|
| 1681 | *str = c;
|
| 1682 | ++str;
|
| 1683 | while (--spec.field_width > 0) {
|
| 1684 | if (str < end)
|
| 1685 | *str = ' ';
|
| 1686 | ++str;
|
| 1687 | }
|
| 1688 | break;
|
| 1689 | }
|
| 1690 |
|
| 1691 | case FORMAT_TYPE_STR:
|
| 1692 | str = string(str, end, va_arg(args, char *), spec);
|
| 1693 | break;
|
| 1694 |
|
| 1695 | case FORMAT_TYPE_PTR:
|
| 1696 | str = pointer(fmt+1, str, end, va_arg(args, void *),
|
| 1697 | spec);
|
| 1698 | while (isalnum(*fmt))
|
| 1699 | fmt++;
|
| 1700 | break;
|
| 1701 |
|
| 1702 | case FORMAT_TYPE_PERCENT_CHAR:
|
| 1703 | if (str < end)
|
| 1704 | *str = '%';
|
| 1705 | ++str;
|
| 1706 | break;
|
| 1707 |
|
| 1708 | case FORMAT_TYPE_INVALID:
|
| 1709 | if (str < end)
|
| 1710 | *str = '%';
|
| 1711 | ++str;
|
| 1712 | break;
|
| 1713 |
|
| 1714 | case FORMAT_TYPE_NRCHARS: {
|
| 1715 | |
| 1716 | * Since %n poses a greater security risk than
|
| 1717 | * utility, ignore %n and skip its argument.
|
| 1718 |
|
| 1719 | void *skip_arg;
|
| 1720 |
|
| 1721 | WARN_ONCE(1, "Please remove ignored %%n in '%s'\n",
|
| 1722 | old_fmt);
|
| 1723 |
|
| 1724 | skip_arg = va_arg(args, void *);
|
| 1725 | break;
|
| 1726 | }
|
| 1727 |
|
| 1728 | default:
|
| 1729 | switch (spec.type) {
|
| 1730 | case FORMAT_TYPE_LONG_LONG:
|
| 1731 | num = va_arg(args, long long);
|
| 1732 | break;
|
| 1733 | case FORMAT_TYPE_ULONG:
|
| 1734 | num = va_arg(args, unsigned long);
|
| 1735 | break;
|
| 1736 | case FORMAT_TYPE_LONG:
|
| 1737 | num = va_arg(args, long);
|
| 1738 | break;
|
| 1739 | case FORMAT_TYPE_SIZE_T:
|
| 1740 | if (spec.flags & SIGN)
|
| 1741 | num = va_arg(args, ssize_t);
|
| 1742 | else
|
| 1743 | num = va_arg(args, size_t);
|
| 1744 | break;
|
| 1745 | case FORMAT_TYPE_PTRDIFF:
|
| 1746 | num = va_arg(args, ptrdiff_t);
|
| 1747 | break;
|
| 1748 | case FORMAT_TYPE_UBYTE:
|
| 1749 | num = (unsigned char) va_arg(args, int);
|
| 1750 | break;
|
| 1751 | case FORMAT_TYPE_BYTE:
|
| 1752 | num = (signed char) va_arg(args, int);
|
| 1753 | break;
|
| 1754 | case FORMAT_TYPE_USHORT:
|
| 1755 | num = (unsigned short) va_arg(args, int);
|
| 1756 | break;
|
| 1757 | case FORMAT_TYPE_SHORT:
|
| 1758 | num = (short) va_arg(args, int);
|
| 1759 | break;
|
| 1760 | case FORMAT_TYPE_INT:
|
| 1761 | num = (int) va_arg(args, int);
|
| 1762 | break;
|
| 1763 | default:
|
| 1764 | num = va_arg(args, unsigned int);
|
| 1765 | }
|
| 1766 |
|
| 1767 | str = number(str, end, num, spec);
|
| 1768 | }
|
| 1769 | }
|
| 1770 |
|
| 1771 | if (size > 0) {
|
| 1772 | if (str < end)
|
| 1773 | *str = '\0';
|
| 1774 | else
|
| 1775 | end[-1] = '\0';
|
| 1776 | }
|
| 1777 |
|
| 1778 |
|
| 1779 | return str-buf;
|
| 1780 |
|
| 1781 | }
|
| 1782 | EXPORT_SYMBOL(vsnprintf);
|
| 1783 |
|
| 1784 | |
| 1785 | * vscnprintf - Format a string and place it in a buffer
|
| 1786 | * @buf: The buffer to place the result into
|
| 1787 | * @size: The size of the buffer, including the trailing null space
|
| 1788 | * @fmt: The format string to use
|
| 1789 | * @args: Arguments for the format string
|
| 1790 | *
|
| 1791 | * The return value is the number of characters which have been written into
|
| 1792 | * the @buf not including the trailing '\0'. If @size is == 0 the function
|
| 1793 | * returns 0.
|
| 1794 | *
|
| 1795 | * If you're not already dealing with a va_list consider using scnprintf().
|
| 1796 | *
|
| 1797 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 1798 |
|
| 1799 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
|
| 1800 | {
|
| 1801 | int i;
|
| 1802 |
|
| 1803 | i = vsnprintf(buf, size, fmt, args);
|
| 1804 |
|
| 1805 | if (likely(i < size))
|
| 1806 | return i;
|
| 1807 | if (size != 0)
|
| 1808 | return size - 1;
|
| 1809 | return 0;
|
| 1810 | }
|
| 1811 | EXPORT_SYMBOL(vscnprintf);
|
| 1812 |
|
| 1813 | |
| 1814 | * snprintf - Format a string and place it in a buffer
|
| 1815 | * @buf: The buffer to place the result into
|
| 1816 | * @size: The size of the buffer, including the trailing null space
|
| 1817 | * @fmt: The format string to use
|
| 1818 | * @...: Arguments for the format string
|
| 1819 | *
|
| 1820 | * The return value is the number of characters which would be
|
| 1821 | * generated for the given input, excluding the trailing null,
|
| 1822 | * as per ISO C99. If the return is greater than or equal to
|
| 1823 | * @size, the resulting string is truncated.
|
| 1824 | *
|
| 1825 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 1826 |
|
| 1827 | int snprintf(char *buf, size_t size, const char *fmt, ...)
|
| 1828 | {
|
| 1829 | va_list args;
|
| 1830 | int i;
|
| 1831 |
|
| 1832 | va_start(args, fmt);
|
| 1833 | i = vsnprintf(buf, size, fmt, args);
|
| 1834 | va_end(args);
|
| 1835 |
|
| 1836 | return i;
|
| 1837 | }
|
| 1838 | EXPORT_SYMBOL(snprintf);
|
| 1839 |
|
| 1840 | |
| 1841 | * scnprintf - Format a string and place it in a buffer
|
| 1842 | * @buf: The buffer to place the result into
|
| 1843 | * @size: The size of the buffer, including the trailing null space
|
| 1844 | * @fmt: The format string to use
|
| 1845 | * @...: Arguments for the format string
|
| 1846 | *
|
| 1847 | * The return value is the number of characters written into @buf not including
|
| 1848 | * the trailing '\0'. If @size is == 0 the function returns 0.
|
| 1849 |
|
| 1850 |
|
| 1851 | int scnprintf(char *buf, size_t size, const char *fmt, ...)
|
| 1852 | {
|
| 1853 | va_list args;
|
| 1854 | int i;
|
| 1855 |
|
| 1856 | va_start(args, fmt);
|
| 1857 | i = vscnprintf(buf, size, fmt, args);
|
| 1858 | va_end(args);
|
| 1859 |
|
| 1860 | return i;
|
| 1861 | }
|
| 1862 | EXPORT_SYMBOL(scnprintf);
|
| 1863 |
|
| 1864 | |
| 1865 | * vsprintf - Format a string and place it in a buffer
|
| 1866 | * @buf: The buffer to place the result into
|
| 1867 | * @fmt: The format string to use
|
| 1868 | * @args: Arguments for the format string
|
| 1869 | *
|
| 1870 | * The function returns the number of characters written
|
| 1871 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
|
| 1872 | * buffer overflows.
|
| 1873 | *
|
| 1874 | * If you're not already dealing with a va_list consider using sprintf().
|
| 1875 | *
|
| 1876 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 1877 |
|
| 1878 | int vsprintf(char *buf, const char *fmt, va_list args)
|
| 1879 | {
|
| 1880 | return vsnprintf(buf, INT_MAX, fmt, args);
|
| 1881 | }
|
| 1882 | EXPORT_SYMBOL(vsprintf);
|
| 1883 |
|
| 1884 | |
| 1885 | * sprintf - Format a string and place it in a buffer
|
| 1886 | * @buf: The buffer to place the result into
|
| 1887 | * @fmt: The format string to use
|
| 1888 | * @...: Arguments for the format string
|
| 1889 | *
|
| 1890 | * The function returns the number of characters written
|
| 1891 | * into @buf. Use snprintf() or scnprintf() in order to avoid
|
| 1892 | * buffer overflows.
|
| 1893 | *
|
| 1894 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 1895 |
|
| 1896 | int sprintf(char *buf, const char *fmt, ...)
|
| 1897 | {
|
| 1898 | va_list args;
|
| 1899 | int i;
|
| 1900 |
|
| 1901 | va_start(args, fmt);
|
| 1902 | i = vsnprintf(buf, INT_MAX, fmt, args);
|
| 1903 | va_end(args);
|
| 1904 |
|
| 1905 | return i;
|
| 1906 | }
|
| 1907 | EXPORT_SYMBOL(sprintf);
|
| 1908 |
|
| 1909 | #ifdef CONFIG_BINARY_PRINTF
|
| 1910 | |
| 1911 | * bprintf service:
|
| 1912 | * vbin_printf() - VA arguments to binary data
|
| 1913 | * bstr_printf() - Binary data to text string
|
| 1914 |
|
| 1915 |
|
| 1916 | |
| 1917 | * vbin_printf - Parse a format string and place args' binary value in a buffer
|
| 1918 | * @bin_buf: The buffer to place args' binary value
|
| 1919 | * @size: The size of the buffer(by words(32bits), not characters)
|
| 1920 | * @fmt: The format string to use
|
| 1921 | * @args: Arguments for the format string
|
| 1922 | *
|
| 1923 | * The format follows C99 vsnprintf, except %n is ignored, and its argument
|
| 1924 | * is skiped.
|
| 1925 | *
|
| 1926 | * The return value is the number of words(32bits) which would be generated for
|
| 1927 | * the given input.
|
| 1928 | *
|
| 1929 | * NOTE:
|
| 1930 | * If the return value is greater than @size, the resulting bin_buf is NOT
|
| 1931 | * valid for bstr_printf().
|
| 1932 |
|
| 1933 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
|
| 1934 | {
|
| 1935 | struct printf_spec spec = {0};
|
| 1936 | char *str, *end;
|
| 1937 |
|
| 1938 | str = (char *)bin_buf;
|
| 1939 | end = (char *)(bin_buf + size);
|
| 1940 |
|
| 1941 | #define save_arg(type) \
|
| 1942 | do { \
|
| 1943 | if (sizeof(type) == 8) { \
|
| 1944 | unsigned long long value; \
|
| 1945 | str = PTR_ALIGN(str, sizeof(u32)); \
|
| 1946 | value = va_arg(args, unsigned long long); \
|
| 1947 | if (str + sizeof(type) <= end) { \
|
| 1948 | *(u32 *)str = *(u32 *)&value; \
|
| 1949 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \
|
| 1950 | } \
|
| 1951 | } else { \
|
| 1952 | unsigned long value; \
|
| 1953 | str = PTR_ALIGN(str, sizeof(type)); \
|
| 1954 | value = va_arg(args, int); \
|
| 1955 | if (str + sizeof(type) <= end) \
|
| 1956 | *(typeof(type) *)str = (type)value; \
|
| 1957 | } \
|
| 1958 | str += sizeof(type); \
|
| 1959 | } while (0)
|
| 1960 |
|
| 1961 | while (*fmt) {
|
| 1962 | int read = format_decode(fmt, &spec);
|
| 1963 |
|
| 1964 | fmt += read;
|
| 1965 |
|
| 1966 | switch (spec.type) {
|
| 1967 | case FORMAT_TYPE_NONE:
|
| 1968 | case FORMAT_TYPE_INVALID:
|
| 1969 | case FORMAT_TYPE_PERCENT_CHAR:
|
| 1970 | break;
|
| 1971 |
|
| 1972 | case FORMAT_TYPE_WIDTH:
|
| 1973 | case FORMAT_TYPE_PRECISION:
|
| 1974 | save_arg(int);
|
| 1975 | break;
|
| 1976 |
|
| 1977 | case FORMAT_TYPE_CHAR:
|
| 1978 | save_arg(char);
|
| 1979 | break;
|
| 1980 |
|
| 1981 | case FORMAT_TYPE_STR: {
|
| 1982 | const char *save_str = va_arg(args, char *);
|
| 1983 | size_t len;
|
| 1984 |
|
| 1985 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
|
| 1986 | || (unsigned long)save_str < PAGE_SIZE)
|
| 1987 | save_str = "(null)";
|
| 1988 | len = strlen(save_str) + 1;
|
| 1989 | if (str + len < end)
|
| 1990 | memcpy(str, save_str, len);
|
| 1991 | str += len;
|
| 1992 | break;
|
| 1993 | }
|
| 1994 |
|
| 1995 | case FORMAT_TYPE_PTR:
|
| 1996 | save_arg(void *);
|
| 1997 |
|
| 1998 | while (isalnum(*fmt))
|
| 1999 | fmt++;
|
| 2000 | break;
|
| 2001 |
|
| 2002 | case FORMAT_TYPE_NRCHARS: {
|
| 2003 |
|
| 2004 | u8 qualifier = spec.qualifier;
|
| 2005 | void *skip_arg;
|
| 2006 | if (qualifier == 'l')
|
| 2007 | skip_arg = va_arg(args, long *);
|
| 2008 | else if (_tolower(qualifier) == 'z')
|
| 2009 | skip_arg = va_arg(args, size_t *);
|
| 2010 | else
|
| 2011 | skip_arg = va_arg(args, int *);
|
| 2012 | break;
|
| 2013 | }
|
| 2014 |
|
| 2015 | default:
|
| 2016 | switch (spec.type) {
|
| 2017 |
|
| 2018 | case FORMAT_TYPE_LONG_LONG:
|
| 2019 | save_arg(long long);
|
| 2020 | break;
|
| 2021 | case FORMAT_TYPE_ULONG:
|
| 2022 | case FORMAT_TYPE_LONG:
|
| 2023 | save_arg(unsigned long);
|
| 2024 | break;
|
| 2025 | case FORMAT_TYPE_SIZE_T:
|
| 2026 | save_arg(size_t);
|
| 2027 | break;
|
| 2028 | case FORMAT_TYPE_PTRDIFF:
|
| 2029 | save_arg(ptrdiff_t);
|
| 2030 | break;
|
| 2031 | case FORMAT_TYPE_UBYTE:
|
| 2032 | case FORMAT_TYPE_BYTE:
|
| 2033 | save_arg(char);
|
| 2034 | break;
|
| 2035 | case FORMAT_TYPE_USHORT:
|
| 2036 | case FORMAT_TYPE_SHORT:
|
| 2037 | save_arg(short);
|
| 2038 | break;
|
| 2039 | default:
|
| 2040 | save_arg(int);
|
| 2041 | }
|
| 2042 | }
|
| 2043 | }
|
| 2044 |
|
| 2045 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
|
| 2046 | #undef save_arg
|
| 2047 | }
|
| 2048 | EXPORT_SYMBOL_GPL(vbin_printf);
|
| 2049 |
|
| 2050 | |
| 2051 | * bstr_printf - Format a string from binary arguments and place it in a buffer
|
| 2052 | * @buf: The buffer to place the result into
|
| 2053 | * @size: The size of the buffer, including the trailing null space
|
| 2054 | * @fmt: The format string to use
|
| 2055 | * @bin_buf: Binary arguments for the format string
|
| 2056 | *
|
| 2057 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets
|
| 2058 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
|
| 2059 | * a binary buffer that generated by vbin_printf.
|
| 2060 | *
|
| 2061 | * The format follows C99 vsnprintf, but has some extensions:
|
| 2062 | * see vsnprintf comment for details.
|
| 2063 | *
|
| 2064 | * The return value is the number of characters which would
|
| 2065 | * be generated for the given input, excluding the trailing
|
| 2066 | * '\0', as per ISO C99. If you want to have the exact
|
| 2067 | * number of characters written into @buf as return value
|
| 2068 | * (not including the trailing '\0'), use vscnprintf(). If the
|
| 2069 | * return is greater than or equal to @size, the resulting
|
| 2070 | * string is truncated.
|
| 2071 |
|
| 2072 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
|
| 2073 | {
|
| 2074 | struct printf_spec spec = {0};
|
| 2075 | char *str, *end;
|
| 2076 | const char *args = (const char *)bin_buf;
|
| 2077 |
|
| 2078 | if (WARN_ON_ONCE((int) size < 0))
|
| 2079 | return 0;
|
| 2080 |
|
| 2081 | str = buf;
|
| 2082 | end = buf + size;
|
| 2083 |
|
| 2084 | #define get_arg(type) \
|
| 2085 | ({ \
|
| 2086 | typeof(type) value; \
|
| 2087 | if (sizeof(type) == 8) { \
|
| 2088 | args = PTR_ALIGN(args, sizeof(u32)); \
|
| 2089 | *(u32 *)&value = *(u32 *)args; \
|
| 2090 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \
|
| 2091 | } else { \
|
| 2092 | args = PTR_ALIGN(args, sizeof(type)); \
|
| 2093 | value = *(typeof(type) *)args; \
|
| 2094 | } \
|
| 2095 | args += sizeof(type); \
|
| 2096 | value; \
|
| 2097 | })
|
| 2098 |
|
| 2099 |
|
| 2100 | if (end < buf) {
|
| 2101 | end = ((void *)-1);
|
| 2102 | size = end - buf;
|
| 2103 | }
|
| 2104 |
|
| 2105 | while (*fmt) {
|
| 2106 | const char *old_fmt = fmt;
|
| 2107 | int read = format_decode(fmt, &spec);
|
| 2108 |
|
| 2109 | fmt += read;
|
| 2110 |
|
| 2111 | switch (spec.type) {
|
| 2112 | case FORMAT_TYPE_NONE: {
|
| 2113 | int copy = read;
|
| 2114 | if (str < end) {
|
| 2115 | if (copy > end - str)
|
| 2116 | copy = end - str;
|
| 2117 | memcpy(str, old_fmt, copy);
|
| 2118 | }
|
| 2119 | str += read;
|
| 2120 | break;
|
| 2121 | }
|
| 2122 |
|
| 2123 | case FORMAT_TYPE_WIDTH:
|
| 2124 | spec.field_width = get_arg(int);
|
| 2125 | break;
|
| 2126 |
|
| 2127 | case FORMAT_TYPE_PRECISION:
|
| 2128 | spec.precision = get_arg(int);
|
| 2129 | break;
|
| 2130 |
|
| 2131 | case FORMAT_TYPE_CHAR: {
|
| 2132 | char c;
|
| 2133 |
|
| 2134 | if (!(spec.flags & LEFT)) {
|
| 2135 | while (--spec.field_width > 0) {
|
| 2136 | if (str < end)
|
| 2137 | *str = ' ';
|
| 2138 | ++str;
|
| 2139 | }
|
| 2140 | }
|
| 2141 | c = (unsigned char) get_arg(char);
|
| 2142 | if (str < end)
|
| 2143 | *str = c;
|
| 2144 | ++str;
|
| 2145 | while (--spec.field_width > 0) {
|
| 2146 | if (str < end)
|
| 2147 | *str = ' ';
|
| 2148 | ++str;
|
| 2149 | }
|
| 2150 | break;
|
| 2151 | }
|
| 2152 |
|
| 2153 | case FORMAT_TYPE_STR: {
|
| 2154 | const char *str_arg = args;
|
| 2155 | args += strlen(str_arg) + 1;
|
| 2156 | str = string(str, end, (char *)str_arg, spec);
|
| 2157 | break;
|
| 2158 | }
|
| 2159 |
|
| 2160 | case FORMAT_TYPE_PTR:
|
| 2161 | str = pointer(fmt+1, str, end, get_arg(void *), spec);
|
| 2162 | while (isalnum(*fmt))
|
| 2163 | fmt++;
|
| 2164 | break;
|
| 2165 |
|
| 2166 | case FORMAT_TYPE_PERCENT_CHAR:
|
| 2167 | case FORMAT_TYPE_INVALID:
|
| 2168 | if (str < end)
|
| 2169 | *str = '%';
|
| 2170 | ++str;
|
| 2171 | break;
|
| 2172 |
|
| 2173 | case FORMAT_TYPE_NRCHARS:
|
| 2174 |
|
| 2175 | break;
|
| 2176 |
|
| 2177 | default: {
|
| 2178 | unsigned long long num;
|
| 2179 |
|
| 2180 | switch (spec.type) {
|
| 2181 |
|
| 2182 | case FORMAT_TYPE_LONG_LONG:
|
| 2183 | num = get_arg(long long);
|
| 2184 | break;
|
| 2185 | case FORMAT_TYPE_ULONG:
|
| 2186 | case FORMAT_TYPE_LONG:
|
| 2187 | num = get_arg(unsigned long);
|
| 2188 | break;
|
| 2189 | case FORMAT_TYPE_SIZE_T:
|
| 2190 | num = get_arg(size_t);
|
| 2191 | break;
|
| 2192 | case FORMAT_TYPE_PTRDIFF:
|
| 2193 | num = get_arg(ptrdiff_t);
|
| 2194 | break;
|
| 2195 | case FORMAT_TYPE_UBYTE:
|
| 2196 | num = get_arg(unsigned char);
|
| 2197 | break;
|
| 2198 | case FORMAT_TYPE_BYTE:
|
| 2199 | num = get_arg(signed char);
|
| 2200 | break;
|
| 2201 | case FORMAT_TYPE_USHORT:
|
| 2202 | num = get_arg(unsigned short);
|
| 2203 | break;
|
| 2204 | case FORMAT_TYPE_SHORT:
|
| 2205 | num = get_arg(short);
|
| 2206 | break;
|
| 2207 | case FORMAT_TYPE_UINT:
|
| 2208 | num = get_arg(unsigned int);
|
| 2209 | break;
|
| 2210 | default:
|
| 2211 | num = get_arg(int);
|
| 2212 | }
|
| 2213 |
|
| 2214 | str = number(str, end, num, spec);
|
| 2215 | }
|
| 2216 | }
|
| 2217 | }
|
| 2218 |
|
| 2219 | if (size > 0) {
|
| 2220 | if (str < end)
|
| 2221 | *str = '\0';
|
| 2222 | else
|
| 2223 | end[-1] = '\0';
|
| 2224 | }
|
| 2225 |
|
| 2226 | #undef get_arg
|
| 2227 |
|
| 2228 |
|
| 2229 | return str - buf;
|
| 2230 | }
|
| 2231 | EXPORT_SYMBOL_GPL(bstr_printf);
|
| 2232 |
|
| 2233 | |
| 2234 | * bprintf - Parse a format string and place args' binary value in a buffer
|
| 2235 | * @bin_buf: The buffer to place args' binary value
|
| 2236 | * @size: The size of the buffer(by words(32bits), not characters)
|
| 2237 | * @fmt: The format string to use
|
| 2238 | * @...: Arguments for the format string
|
| 2239 | *
|
| 2240 | * The function returns the number of words(u32) written
|
| 2241 | * into @bin_buf.
|
| 2242 |
|
| 2243 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
|
| 2244 | {
|
| 2245 | va_list args;
|
| 2246 | int ret;
|
| 2247 |
|
| 2248 | va_start(args, fmt);
|
| 2249 | ret = vbin_printf(bin_buf, size, fmt, args);
|
| 2250 | va_end(args);
|
| 2251 |
|
| 2252 | return ret;
|
| 2253 | }
|
| 2254 | EXPORT_SYMBOL_GPL(bprintf);
|
| 2255 |
|
| 2256 | #endif
|
| 2257 |
|
| 2258 | |
| 2259 | * vsscanf - Unformat a buffer into a list of arguments
|
| 2260 | * @buf: input buffer
|
| 2261 | * @fmt: format of buffer
|
| 2262 | * @args: arguments
|
| 2263 |
|
| 2264 | int vsscanf(const char *buf, const char *fmt, va_list args)
|
| 2265 | {
|
| 2266 | const char *str = buf;
|
| 2267 | char *next;
|
| 2268 | char digit;
|
| 2269 | int num = 0;
|
| 2270 | u8 qualifier;
|
| 2271 | unsigned int base;
|
| 2272 | union {
|
| 2273 | long long s;
|
| 2274 | unsigned long long u;
|
| 2275 | } val;
|
| 2276 | s16 field_width;
|
| 2277 | bool is_sign;
|
| 2278 |
|
| 2279 | while (*fmt) {
|
| 2280 |
|
| 2281 | |
| 2282 | * white space, including none, in the input.
|
| 2283 |
|
| 2284 | if (isspace(*fmt)) {
|
| 2285 | fmt = skip_spaces(++fmt);
|
| 2286 | str = skip_spaces(str);
|
| 2287 | }
|
| 2288 |
|
| 2289 |
|
| 2290 | if (*fmt != '%' && *fmt) {
|
| 2291 | if (*fmt++ != *str++)
|
| 2292 | break;
|
| 2293 | continue;
|
| 2294 | }
|
| 2295 |
|
| 2296 | if (!*fmt)
|
| 2297 | break;
|
| 2298 | ++fmt;
|
| 2299 |
|
| 2300 | |
| 2301 | * advance both strings to next white space
|
| 2302 |
|
| 2303 | if (*fmt == '*') {
|
| 2304 | if (!*str)
|
| 2305 | break;
|
| 2306 | while (!isspace(*fmt) && *fmt != '%' && *fmt)
|
| 2307 | fmt++;
|
| 2308 | while (!isspace(*str) && *str)
|
| 2309 | str++;
|
| 2310 | continue;
|
| 2311 | }
|
| 2312 |
|
| 2313 |
|
| 2314 | field_width = -1;
|
| 2315 | if (isdigit(*fmt)) {
|
| 2316 | field_width = skip_atoi(&fmt);
|
| 2317 | if (field_width <= 0)
|
| 2318 | break;
|
| 2319 | }
|
| 2320 |
|
| 2321 |
|
| 2322 | qualifier = -1;
|
| 2323 | if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
|
| 2324 | _tolower(*fmt) == 'z') {
|
| 2325 | qualifier = *fmt++;
|
| 2326 | if (unlikely(qualifier == *fmt)) {
|
| 2327 | if (qualifier == 'h') {
|
| 2328 | qualifier = 'H';
|
| 2329 | fmt++;
|
| 2330 | } else if (qualifier == 'l') {
|
| 2331 | qualifier = 'L';
|
| 2332 | fmt++;
|
| 2333 | }
|
| 2334 | }
|
| 2335 | }
|
| 2336 |
|
| 2337 | if (!*fmt)
|
| 2338 | break;
|
| 2339 |
|
| 2340 | if (*fmt == 'n') {
|
| 2341 |
|
| 2342 | *va_arg(args, int *) = str - buf;
|
| 2343 | ++fmt;
|
| 2344 | continue;
|
| 2345 | }
|
| 2346 |
|
| 2347 | if (!*str)
|
| 2348 | break;
|
| 2349 |
|
| 2350 | base = 10;
|
| 2351 | is_sign = 0;
|
| 2352 |
|
| 2353 | switch (*fmt++) {
|
| 2354 | case 'c':
|
| 2355 | {
|
| 2356 | char *s = (char *)va_arg(args, char*);
|
| 2357 | if (field_width == -1)
|
| 2358 | field_width = 1;
|
| 2359 | do {
|
| 2360 | *s++ = *str++;
|
| 2361 | } while (--field_width > 0 && *str);
|
| 2362 | num++;
|
| 2363 | }
|
| 2364 | continue;
|
| 2365 | case 's':
|
| 2366 | {
|
| 2367 | char *s = (char *)va_arg(args, char *);
|
| 2368 | if (field_width == -1)
|
| 2369 | field_width = SHRT_MAX;
|
| 2370 |
|
| 2371 | str = skip_spaces(str);
|
| 2372 |
|
| 2373 |
|
| 2374 | while (*str && !isspace(*str) && field_width--)
|
| 2375 | *s++ = *str++;
|
| 2376 | *s = '\0';
|
| 2377 | num++;
|
| 2378 | }
|
| 2379 | continue;
|
| 2380 | case 'o':
|
| 2381 | base = 8;
|
| 2382 | break;
|
| 2383 | case 'x':
|
| 2384 | case 'X':
|
| 2385 | base = 16;
|
| 2386 | break;
|
| 2387 | case 'i':
|
| 2388 | base = 0;
|
| 2389 | case 'd':
|
| 2390 | is_sign = 1;
|
| 2391 | case 'u':
|
| 2392 | break;
|
| 2393 | case '%':
|
| 2394 |
|
| 2395 | if (*str++ != '%')
|
| 2396 | return num;
|
| 2397 | continue;
|
| 2398 | default:
|
| 2399 |
|
| 2400 | return num;
|
| 2401 | }
|
| 2402 |
|
| 2403 | |
| 2404 | * first, skip white space in buffer.
|
| 2405 |
|
| 2406 | str = skip_spaces(str);
|
| 2407 |
|
| 2408 | digit = *str;
|
| 2409 | if (is_sign && digit == '-')
|
| 2410 | digit = *(str + 1);
|
| 2411 |
|
| 2412 | if (!digit
|
| 2413 | || (base == 16 && !isxdigit(digit))
|
| 2414 | || (base == 10 && !isdigit(digit))
|
| 2415 | || (base == 8 && (!isdigit(digit) || digit > '7'))
|
| 2416 | || (base == 0 && !isdigit(digit)))
|
| 2417 | break;
|
| 2418 |
|
| 2419 | if (is_sign)
|
| 2420 | val.s = qualifier != 'L' ?
|
| 2421 | simple_strtol(str, &next, base) :
|
| 2422 | simple_strtoll(str, &next, base);
|
| 2423 | else
|
| 2424 | val.u = qualifier != 'L' ?
|
| 2425 | simple_strtoul(str, &next, base) :
|
| 2426 | simple_strtoull(str, &next, base);
|
| 2427 |
|
| 2428 | if (field_width > 0 && next - str > field_width) {
|
| 2429 | if (base == 0)
|
| 2430 | _parse_integer_fixup_radix(str, &base);
|
| 2431 | while (next - str > field_width) {
|
| 2432 | if (is_sign)
|
| 2433 | val.s = div_s64(val.s, base);
|
| 2434 | else
|
| 2435 | val.u = div_u64(val.u, base);
|
| 2436 | --next;
|
| 2437 | }
|
| 2438 | }
|
| 2439 |
|
| 2440 | switch (qualifier) {
|
| 2441 | case 'H':
|
| 2442 | if (is_sign)
|
| 2443 | *va_arg(args, signed char *) = val.s;
|
| 2444 | else
|
| 2445 | *va_arg(args, unsigned char *) = val.u;
|
| 2446 | break;
|
| 2447 | case 'h':
|
| 2448 | if (is_sign)
|
| 2449 | *va_arg(args, short *) = val.s;
|
| 2450 | else
|
| 2451 | *va_arg(args, unsigned short *) = val.u;
|
| 2452 | break;
|
| 2453 | case 'l':
|
| 2454 | if (is_sign)
|
| 2455 | *va_arg(args, long *) = val.s;
|
| 2456 | else
|
| 2457 | *va_arg(args, unsigned long *) = val.u;
|
| 2458 | break;
|
| 2459 | case 'L':
|
| 2460 | if (is_sign)
|
| 2461 | *va_arg(args, long long *) = val.s;
|
| 2462 | else
|
| 2463 | *va_arg(args, unsigned long long *) = val.u;
|
| 2464 | break;
|
| 2465 | case 'Z':
|
| 2466 | case 'z':
|
| 2467 | *va_arg(args, size_t *) = val.u;
|
| 2468 | break;
|
| 2469 | default:
|
| 2470 | if (is_sign)
|
| 2471 | *va_arg(args, int *) = val.s;
|
| 2472 | else
|
| 2473 | *va_arg(args, unsigned int *) = val.u;
|
| 2474 | break;
|
| 2475 | }
|
| 2476 | num++;
|
| 2477 |
|
| 2478 | if (!next)
|
| 2479 | break;
|
| 2480 | str = next;
|
| 2481 | }
|
| 2482 |
|
| 2483 | return num;
|
| 2484 | }
|
| 2485 | EXPORT_SYMBOL(vsscanf);
|
| 2486 |
|
| 2487 | |
| 2488 | * sscanf - Unformat a buffer into a list of arguments
|
| 2489 | * @buf: input buffer
|
| 2490 | * @fmt: formatting of buffer
|
| 2491 | * @...: resulting arguments
|
| 2492 |
|
| 2493 | int sscanf(const char *buf, const char *fmt, ...)
|
| 2494 | {
|
| 2495 | va_list args;
|
| 2496 | int i;
|
| 2497 |
|
| 2498 | va_start(args, fmt);
|
| 2499 | i = vsscanf(buf, fmt, args);
|
| 2500 | va_end(args);
|
| 2501 |
|
| 2502 | return i;
|
| 2503 | }
|
| 2504 | EXPORT_SYMBOL(sscanf);
|