| 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/uaccess.h>
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| 27 | #include <linux/ioport.h>
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| 28 | #include <net/addrconf.h>
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| 29 |
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| 30 | #include <asm/page.h>
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| 31 | #include <asm/div64.h>
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| 32 | #include <asm/sections.h>
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| 33 |
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| 34 | #include "kstrtox.h"
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| 35 |
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| 36 | |
| 37 | * simple_strtoull - convert a string to an unsigned long long
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| 38 | * @cp: The start of the string
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| 39 | * @endp: A pointer to the end of the parsed string will be placed here
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| 40 | * @base: The number base to use
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| 41 |
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| 42 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
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| 43 | {
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| 44 | unsigned long long result;
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| 45 | unsigned int rv;
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| 46 |
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| 47 | cp = _parse_integer_fixup_radix(cp, &base);
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| 48 | rv = _parse_integer(cp, base, &result);
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| 49 |
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| 50 | cp += (rv & ~KSTRTOX_OVERFLOW);
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| 51 |
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| 52 | if (endp)
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| 53 | *endp = (char *)cp;
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| 54 |
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| 55 | return result;
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| 56 | }
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| 57 | EXPORT_SYMBOL(simple_strtoull);
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| 58 |
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| 59 | |
| 60 | * simple_strtoul - convert a string to an unsigned long
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| 61 | * @cp: The start of the string
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| 62 | * @endp: A pointer to the end of the parsed string will be placed here
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| 63 | * @base: The number base to use
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| 64 |
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| 65 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
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| 66 | {
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| 67 | return simple_strtoull(cp, endp, base);
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| 68 | }
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| 69 | EXPORT_SYMBOL(simple_strtoul);
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| 70 |
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| 71 | |
| 72 | * simple_strtol - convert a string to a signed long
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| 73 | * @cp: The start of the string
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| 74 | * @endp: A pointer to the end of the parsed string will be placed here
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| 75 | * @base: The number base to use
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| 76 |
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| 77 | long simple_strtol(const char *cp, char **endp, unsigned int base)
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| 78 | {
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| 79 | if (*cp == '-')
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| 80 | return -simple_strtoul(cp + 1, endp, base);
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| 81 |
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| 82 | return simple_strtoul(cp, endp, base);
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| 83 | }
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| 84 | EXPORT_SYMBOL(simple_strtol);
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| 85 |
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| 86 | |
| 87 | * simple_strtoll - convert a string to a signed long long
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| 88 | * @cp: The start of the string
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| 89 | * @endp: A pointer to the end of the parsed string will be placed here
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| 90 | * @base: The number base to use
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| 91 |
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| 92 | long long simple_strtoll(const char *cp, char **endp, unsigned int base)
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| 93 | {
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| 94 | if (*cp == '-')
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| 95 | return -simple_strtoull(cp + 1, endp, base);
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| 96 |
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| 97 | return simple_strtoull(cp, endp, base);
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| 98 | }
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| 99 | EXPORT_SYMBOL(simple_strtoll);
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| 100 |
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| 101 | static noinline_for_stack
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| 102 | int skip_atoi(const char **s)
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| 103 | {
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| 104 | int i = 0;
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| 105 |
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| 106 | while (isdigit(**s))
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| 107 | i = i*10 + *((*s)++) - '0';
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| 108 |
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| 109 | return i;
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| 110 | }
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| 111 |
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| 112 | |
| 113 | * for /proc and /sys data. This directly impacts e.g. top performance
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| 114 | * with many processes running. We optimize it for speed
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| 115 | * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html>
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| 116 | * (with permission from the author, Douglas W. Jones).
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| 117 |
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| 118 |
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| 119 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64
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| 120 |
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| 121 | static noinline_for_stack
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| 122 | char *put_dec_full9(char *buf, unsigned q)
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| 123 | {
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| 124 | unsigned r;
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| 125 |
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| 126 | |
| 127 | * Possible ways to approx. divide by 10
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| 128 | * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit)
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| 129 | * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul)
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| 130 | * (x * 0x6667) >> 18 x < 43699
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| 131 | * (x * 0x3334) >> 17 x < 16389
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| 132 | * (x * 0x199a) >> 16 x < 16389
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| 133 | * (x * 0x0ccd) >> 15 x < 16389
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| 134 | * (x * 0x0667) >> 14 x < 2739
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| 135 | * (x * 0x0334) >> 13 x < 1029
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| 136 | * (x * 0x019a) >> 12 x < 1029
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| 137 | * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386)
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| 138 | * (x * 0x0067) >> 10 x < 179
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| 139 | * (x * 0x0034) >> 9 x < 69 same
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| 140 | * (x * 0x001a) >> 8 x < 69 same
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| 141 | * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386)
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| 142 | * (x * 0x0007) >> 6 x < 19
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| 143 | * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html>
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| 144 |
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| 145 | r = (q * (uint64_t)0x1999999a) >> 32;
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| 146 | *buf++ = (q - 10 * r) + '0';
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| 147 | q = (r * (uint64_t)0x1999999a) >> 32;
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| 148 | *buf++ = (r - 10 * q) + '0';
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| 149 | r = (q * (uint64_t)0x1999999a) >> 32;
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| 150 | *buf++ = (q - 10 * r) + '0';
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| 151 | q = (r * (uint64_t)0x1999999a) >> 32;
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| 152 | *buf++ = (r - 10 * q) + '0';
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| 153 | r = (q * (uint64_t)0x1999999a) >> 32;
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| 154 | *buf++ = (q - 10 * r) + '0';
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| 155 |
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| 156 | q = (r * 0x199a) >> 16;
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| 157 | *buf++ = (r - 10 * q) + '0';
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| 158 | r = (q * 0xcd) >> 11;
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| 159 | *buf++ = (q - 10 * r) + '0';
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| 160 | q = (r * 0xcd) >> 11;
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| 161 | *buf++ = (r - 10 * q) + '0';
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| 162 | *buf++ = q + '0';
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| 163 | return buf;
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| 164 | }
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| 165 | #endif
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| 166 |
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| 167 | |
| 168 | * Code can be easily arranged to print 9 digits too, but our callers
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| 169 | * always call put_dec_full9() instead when the number has 9 decimal digits.
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| 170 |
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| 171 | static noinline_for_stack
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| 172 | char *put_dec_trunc8(char *buf, unsigned r)
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| 173 | {
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| 174 | unsigned q;
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| 175 |
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| 176 |
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| 177 | q = (r * (uint64_t)0x1999999a) >> 32;
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| 178 | *buf++ = (r - 10 * q) + '0';
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| 179 | if (q == 0)
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| 180 | return buf;
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| 181 | r = (q * (uint64_t)0x1999999a) >> 32;
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| 182 | *buf++ = (q - 10 * r) + '0';
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| 183 | if (r == 0)
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| 184 | return buf;
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| 185 | q = (r * (uint64_t)0x1999999a) >> 32;
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| 186 | *buf++ = (r - 10 * q) + '0';
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| 187 | if (q == 0)
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| 188 | return buf;
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| 189 | r = (q * (uint64_t)0x1999999a) >> 32;
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| 190 | *buf++ = (q - 10 * r) + '0';
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| 191 | if (r == 0)
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| 192 | return buf;
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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 | static noinline_for_stack
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| 247 | char *put_dec_full4(char *buf, unsigned q)
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| 248 | {
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| 249 | unsigned r;
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| 250 | r = (q * 0xcccd) >> 19;
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| 251 | *buf++ = (q - 10 * r) + '0';
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| 252 | q = (r * 0x199a) >> 16;
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| 253 | *buf++ = (r - 10 * q) + '0';
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| 254 | r = (q * 0xcd) >> 11;
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| 255 | *buf++ = (q - 10 * r) + '0';
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| 256 | *buf++ = r + '0';
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| 257 | return buf;
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| 258 | }
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| 259 |
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| 260 | |
| 261 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
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| 262 | * (with permission from the author).
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| 263 | * Performs no 64-bit division and hence should be fast on 32-bit machines.
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| 264 |
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| 265 | static
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| 266 | char *put_dec(char *buf, unsigned long long n)
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| 267 | {
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| 268 | uint32_t d3, d2, d1, q, h;
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| 269 |
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| 270 | if (n < 100*1000*1000)
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| 271 | return put_dec_trunc8(buf, n);
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| 272 |
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| 273 | d1 = ((uint32_t)n >> 16);
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| 274 | h = (n >> 32);
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| 275 | d2 = (h ) & 0xffff;
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| 276 | d3 = (h >> 16);
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| 277 |
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| 278 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
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| 279 |
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| 280 | buf = put_dec_full4(buf, q % 10000);
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| 281 | q = q / 10000;
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| 282 |
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| 283 | d1 = q + 7671 * d3 + 9496 * d2 + 6 * d1;
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| 284 | buf = put_dec_full4(buf, d1 % 10000);
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| 285 | q = d1 / 10000;
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| 286 |
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| 287 | d2 = q + 4749 * d3 + 42 * d2;
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| 288 | buf = put_dec_full4(buf, d2 % 10000);
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| 289 | q = d2 / 10000;
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| 290 |
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| 291 | d3 = q + 281 * d3;
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| 292 | if (!d3)
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| 293 | goto done;
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| 294 | buf = put_dec_full4(buf, d3 % 10000);
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| 295 | q = d3 / 10000;
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| 296 | if (!q)
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| 297 | goto done;
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| 298 | buf = put_dec_full4(buf, q);
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| 299 | done:
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| 300 | while (buf[-1] == '0')
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| 301 | --buf;
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| 302 |
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| 303 | return buf;
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| 304 | }
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| 305 |
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| 306 | #endif
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| 307 |
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| 308 | |
| 309 | * Convert passed number to decimal string.
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| 310 | * Returns the length of string. On buffer overflow, returns 0.
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| 311 | *
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| 312 | * If speed is not important, use snprintf(). It's easy to read the code.
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| 313 |
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| 314 | int num_to_str(char *buf, int size, unsigned long long num)
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| 315 | {
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| 316 | char tmp[sizeof(num) * 3];
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| 317 | int idx, len;
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| 318 |
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| 319 |
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| 320 | if (num <= 9) {
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| 321 | tmp[0] = '0' + num;
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| 322 | len = 1;
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| 323 | } else {
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| 324 | len = put_dec(tmp, num) - tmp;
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| 325 | }
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| 326 |
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| 327 | if (len > size)
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| 328 | return 0;
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| 329 | for (idx = 0; idx < len; ++idx)
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| 330 | buf[idx] = tmp[len - idx - 1];
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| 331 | return len;
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| 332 | }
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| 333 |
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| 334 | #define ZEROPAD 1
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| 335 | #define SIGN 2
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| 336 | #define PLUS 4
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| 337 | #define SPACE 8
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| 338 | #define LEFT 16
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| 339 | #define SMALL 32
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| 340 | #define SPECIAL 64
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| 341 |
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| 342 | enum format_type {
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| 343 | FORMAT_TYPE_NONE,
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| 344 | FORMAT_TYPE_WIDTH,
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| 345 | FORMAT_TYPE_PRECISION,
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| 346 | FORMAT_TYPE_CHAR,
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| 347 | FORMAT_TYPE_STR,
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| 348 | FORMAT_TYPE_PTR,
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| 349 | FORMAT_TYPE_PERCENT_CHAR,
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| 350 | FORMAT_TYPE_INVALID,
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| 351 | FORMAT_TYPE_LONG_LONG,
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| 352 | FORMAT_TYPE_ULONG,
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| 353 | FORMAT_TYPE_LONG,
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| 354 | FORMAT_TYPE_UBYTE,
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| 355 | FORMAT_TYPE_BYTE,
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| 356 | FORMAT_TYPE_USHORT,
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| 357 | FORMAT_TYPE_SHORT,
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| 358 | FORMAT_TYPE_UINT,
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| 359 | FORMAT_TYPE_INT,
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| 360 | FORMAT_TYPE_NRCHARS,
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| 361 | FORMAT_TYPE_SIZE_T,
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| 362 | FORMAT_TYPE_PTRDIFF
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| 363 | };
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| 364 |
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| 365 | struct printf_spec {
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| 366 | u8 type;
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| 367 | u8 flags;
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| 368 | u8 base;
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| 369 | u8 qualifier;
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| 370 | s16 field_width;
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| 371 | s16 precision;
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| 372 | };
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| 373 |
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| 374 | static noinline_for_stack
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| 375 | char *number(char *buf, char *end, unsigned long long num,
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| 376 | struct printf_spec spec)
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| 377 | {
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| 378 |
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| 379 | static const char digits[16] = "0123456789ABCDEF";
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| 380 |
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| 381 | char tmp[66];
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| 382 | char sign;
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| 383 | char locase;
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| 384 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
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| 385 | int i;
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| 386 | bool is_zero = num == 0LL;
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| 387 |
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| 388 | |
| 389 | * produces same digits or (maybe lowercased) letters
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| 390 | locase = (spec.flags & SMALL);
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| 391 | if (spec.flags & LEFT)
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| 392 | spec.flags &= ~ZEROPAD;
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| 393 | sign = 0;
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| 394 | if (spec.flags & SIGN) {
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| 395 | if ((signed long long)num < 0) {
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| 396 | sign = '-';
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| 397 | num = -(signed long long)num;
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| 398 | spec.field_width--;
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| 399 | } else if (spec.flags & PLUS) {
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| 400 | sign = '+';
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| 401 | spec.field_width--;
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| 402 | } else if (spec.flags & SPACE) {
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| 403 | sign = ' ';
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| 404 | spec.field_width--;
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| 405 | }
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| 406 | }
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| 407 | if (need_pfx) {
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| 408 | if (spec.base == 16)
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| 409 | spec.field_width -= 2;
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| 410 | else if (!is_zero)
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| 411 | spec.field_width--;
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| 412 | }
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| 413 |
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| 414 |
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| 415 | i = 0;
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| 416 | if (num < spec.base)
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| 417 | tmp[i++] = digits[num] | locase;
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| 418 | |
| 419 | else do {
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| 420 | tmp[i++] = (digits[do_div(num,base)] | locase);
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| 421 | } while (num != 0);
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| 422 |
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| 423 | else if (spec.base != 10) {
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| 424 | int mask = spec.base - 1;
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| 425 | int shift = 3;
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| 426 |
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| 427 | if (spec.base == 16)
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| 428 | shift = 4;
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| 429 | do {
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| 430 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
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| 431 | num >>= shift;
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| 432 | } while (num);
|
| 433 | } else {
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| 434 | i = put_dec(tmp, num) - tmp;
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| 435 | }
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| 436 |
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| 437 |
|
| 438 | if (i > spec.precision)
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| 439 | spec.precision = i;
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| 440 |
|
| 441 | spec.field_width -= spec.precision;
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| 442 | if (!(spec.flags & (ZEROPAD+LEFT))) {
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| 443 | while (--spec.field_width >= 0) {
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| 444 | if (buf < end)
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| 445 | *buf = ' ';
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| 446 | ++buf;
|
| 447 | }
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| 448 | }
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| 449 |
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| 450 | if (sign) {
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| 451 | if (buf < end)
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| 452 | *buf = sign;
|
| 453 | ++buf;
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| 454 | }
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| 455 |
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| 456 | if (need_pfx) {
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| 457 | if (spec.base == 16 || !is_zero) {
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| 458 | if (buf < end)
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| 459 | *buf = '0';
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| 460 | ++buf;
|
| 461 | }
|
| 462 | if (spec.base == 16) {
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| 463 | if (buf < end)
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| 464 | *buf = ('X' | locase);
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| 465 | ++buf;
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| 466 | }
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| 467 | }
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| 468 |
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| 469 | if (!(spec.flags & LEFT)) {
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| 470 | char c = (spec.flags & ZEROPAD) ? '0' : ' ';
|
| 471 | while (--spec.field_width >= 0) {
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| 472 | if (buf < end)
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| 473 | *buf = c;
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| 474 | ++buf;
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| 475 | }
|
| 476 | }
|
| 477 |
|
| 478 | while (i <= --spec.precision) {
|
| 479 | if (buf < end)
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| 480 | *buf = '0';
|
| 481 | ++buf;
|
| 482 | }
|
| 483 |
|
| 484 | while (--i >= 0) {
|
| 485 | if (buf < end)
|
| 486 | *buf = tmp[i];
|
| 487 | ++buf;
|
| 488 | }
|
| 489 |
|
| 490 | while (--spec.field_width >= 0) {
|
| 491 | if (buf < end)
|
| 492 | *buf = ' ';
|
| 493 | ++buf;
|
| 494 | }
|
| 495 |
|
| 496 | return buf;
|
| 497 | }
|
| 498 |
|
| 499 | static noinline_for_stack
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| 500 | char *string(char *buf, char *end, const char *s, struct printf_spec spec)
|
| 501 | {
|
| 502 | int len, i;
|
| 503 |
|
| 504 | if ((unsigned long)s < PAGE_SIZE)
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| 505 | s = "(null)";
|
| 506 |
|
| 507 | len = strnlen(s, spec.precision);
|
| 508 |
|
| 509 | if (!(spec.flags & LEFT)) {
|
| 510 | while (len < spec.field_width--) {
|
| 511 | if (buf < end)
|
| 512 | *buf = ' ';
|
| 513 | ++buf;
|
| 514 | }
|
| 515 | }
|
| 516 | for (i = 0; i < len; ++i) {
|
| 517 | if (buf < end)
|
| 518 | *buf = *s;
|
| 519 | ++buf; ++s;
|
| 520 | }
|
| 521 | while (len < spec.field_width--) {
|
| 522 | if (buf < end)
|
| 523 | *buf = ' ';
|
| 524 | ++buf;
|
| 525 | }
|
| 526 |
|
| 527 | return buf;
|
| 528 | }
|
| 529 |
|
| 530 | static noinline_for_stack
|
| 531 | char *symbol_string(char *buf, char *end, void *ptr,
|
| 532 | struct printf_spec spec, char ext)
|
| 533 | {
|
| 534 | unsigned long value = (unsigned long) ptr;
|
| 535 | #ifdef CONFIG_KALLSYMS
|
| 536 | char sym[KSYM_SYMBOL_LEN];
|
| 537 | if (ext == 'B')
|
| 538 | sprint_backtrace(sym, value);
|
| 539 | else if (ext != 'f' && ext != 's')
|
| 540 | sprint_symbol(sym, value);
|
| 541 | else
|
| 542 | sprint_symbol_no_offset(sym, value);
|
| 543 |
|
| 544 | return string(buf, end, sym, spec);
|
| 545 | #else
|
| 546 | spec.field_width = 2 * sizeof(void *);
|
| 547 | spec.flags |= SPECIAL | SMALL | ZEROPAD;
|
| 548 | spec.base = 16;
|
| 549 |
|
| 550 | return number(buf, end, value, spec);
|
| 551 | #endif
|
| 552 | }
|
| 553 |
|
| 554 | static noinline_for_stack
|
| 555 | char *resource_string(char *buf, char *end, struct resource *res,
|
| 556 | struct printf_spec spec, const char *fmt)
|
| 557 | {
|
| 558 | #ifndef IO_RSRC_PRINTK_SIZE
|
| 559 | #define IO_RSRC_PRINTK_SIZE 6
|
| 560 | #endif
|
| 561 |
|
| 562 | #ifndef MEM_RSRC_PRINTK_SIZE
|
| 563 | #define MEM_RSRC_PRINTK_SIZE 10
|
| 564 | #endif
|
| 565 | static const struct printf_spec io_spec = {
|
| 566 | .base = 16,
|
| 567 | .field_width = IO_RSRC_PRINTK_SIZE,
|
| 568 | .precision = -1,
|
| 569 | .flags = SPECIAL | SMALL | ZEROPAD,
|
| 570 | };
|
| 571 | static const struct printf_spec mem_spec = {
|
| 572 | .base = 16,
|
| 573 | .field_width = MEM_RSRC_PRINTK_SIZE,
|
| 574 | .precision = -1,
|
| 575 | .flags = SPECIAL | SMALL | ZEROPAD,
|
| 576 | };
|
| 577 | static const struct printf_spec bus_spec = {
|
| 578 | .base = 16,
|
| 579 | .field_width = 2,
|
| 580 | .precision = -1,
|
| 581 | .flags = SMALL | ZEROPAD,
|
| 582 | };
|
| 583 | static const struct printf_spec dec_spec = {
|
| 584 | .base = 10,
|
| 585 | .precision = -1,
|
| 586 | .flags = 0,
|
| 587 | };
|
| 588 | static const struct printf_spec str_spec = {
|
| 589 | .field_width = -1,
|
| 590 | .precision = 10,
|
| 591 | .flags = LEFT,
|
| 592 | };
|
| 593 | static const struct printf_spec flag_spec = {
|
| 594 | .base = 16,
|
| 595 | .precision = -1,
|
| 596 | .flags = SPECIAL | SMALL,
|
| 597 | };
|
| 598 |
|
| 599 | |
| 600 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16)
|
| 601 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
|
| 602 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
|
| 603 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
|
| 604 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
|
| 605 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
|
| 606 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
|
| 607 |
|
| 608 | char *p = sym, *pend = sym + sizeof(sym);
|
| 609 | int decode = (fmt[0] == 'R') ? 1 : 0;
|
| 610 | const struct printf_spec *specp;
|
| 611 |
|
| 612 | *p++ = '[';
|
| 613 | if (res->flags & IORESOURCE_IO) {
|
| 614 | p = string(p, pend, "io ", str_spec);
|
| 615 | specp = &io_spec;
|
| 616 | } else if (res->flags & IORESOURCE_MEM) {
|
| 617 | p = string(p, pend, "mem ", str_spec);
|
| 618 | specp = &mem_spec;
|
| 619 | } else if (res->flags & IORESOURCE_IRQ) {
|
| 620 | p = string(p, pend, "irq ", str_spec);
|
| 621 | specp = &dec_spec;
|
| 622 | } else if (res->flags & IORESOURCE_DMA) {
|
| 623 | p = string(p, pend, "dma ", str_spec);
|
| 624 | specp = &dec_spec;
|
| 625 | } else if (res->flags & IORESOURCE_BUS) {
|
| 626 | p = string(p, pend, "bus ", str_spec);
|
| 627 | specp = &bus_spec;
|
| 628 | } else {
|
| 629 | p = string(p, pend, "??? ", str_spec);
|
| 630 | specp = &mem_spec;
|
| 631 | decode = 0;
|
| 632 | }
|
| 633 | p = number(p, pend, res->start, *specp);
|
| 634 | if (res->start != res->end) {
|
| 635 | *p++ = '-';
|
| 636 | p = number(p, pend, res->end, *specp);
|
| 637 | }
|
| 638 | if (decode) {
|
| 639 | if (res->flags & IORESOURCE_MEM_64)
|
| 640 | p = string(p, pend, " 64bit", str_spec);
|
| 641 | if (res->flags & IORESOURCE_PREFETCH)
|
| 642 | p = string(p, pend, " pref", str_spec);
|
| 643 | if (res->flags & IORESOURCE_WINDOW)
|
| 644 | p = string(p, pend, " window", str_spec);
|
| 645 | if (res->flags & IORESOURCE_DISABLED)
|
| 646 | p = string(p, pend, " disabled", str_spec);
|
| 647 | } else {
|
| 648 | p = string(p, pend, " flags ", str_spec);
|
| 649 | p = number(p, pend, res->flags, flag_spec);
|
| 650 | }
|
| 651 | *p++ = ']';
|
| 652 | *p = '\0';
|
| 653 |
|
| 654 | return string(buf, end, sym, spec);
|
| 655 | }
|
| 656 |
|
| 657 | static noinline_for_stack
|
| 658 | char *mac_address_string(char *buf, char *end, u8 *addr,
|
| 659 | struct printf_spec spec, const char *fmt)
|
| 660 | {
|
| 661 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
|
| 662 | char *p = mac_addr;
|
| 663 | int i;
|
| 664 | char separator;
|
| 665 |
|
| 666 | if (fmt[1] == 'F') {
|
| 667 | separator = '-';
|
| 668 | } else {
|
| 669 | separator = ':';
|
| 670 | }
|
| 671 |
|
| 672 | for (i = 0; i < 6; i++) {
|
| 673 | p = hex_byte_pack(p, addr[i]);
|
| 674 | if (fmt[0] == 'M' && i != 5)
|
| 675 | *p++ = separator;
|
| 676 | }
|
| 677 | *p = '\0';
|
| 678 |
|
| 679 | return string(buf, end, mac_addr, spec);
|
| 680 | }
|
| 681 |
|
| 682 | static noinline_for_stack
|
| 683 | char *ip4_string(char *p, const u8 *addr, const char *fmt)
|
| 684 | {
|
| 685 | int i;
|
| 686 | bool leading_zeros = (fmt[0] == 'i');
|
| 687 | int index;
|
| 688 | int step;
|
| 689 |
|
| 690 | switch (fmt[2]) {
|
| 691 | case 'h':
|
| 692 | #ifdef __BIG_ENDIAN
|
| 693 | index = 0;
|
| 694 | step = 1;
|
| 695 | #else
|
| 696 | index = 3;
|
| 697 | step = -1;
|
| 698 | #endif
|
| 699 | break;
|
| 700 | case 'l':
|
| 701 | index = 3;
|
| 702 | step = -1;
|
| 703 | break;
|
| 704 | case 'n':
|
| 705 | case 'b':
|
| 706 | default:
|
| 707 | index = 0;
|
| 708 | step = 1;
|
| 709 | break;
|
| 710 | }
|
| 711 | for (i = 0; i < 4; i++) {
|
| 712 | char temp[3];
|
| 713 | int digits = put_dec_trunc8(temp, addr[index]) - temp;
|
| 714 | if (leading_zeros) {
|
| 715 | if (digits < 3)
|
| 716 | *p++ = '0';
|
| 717 | if (digits < 2)
|
| 718 | *p++ = '0';
|
| 719 | }
|
| 720 |
|
| 721 | while (digits--)
|
| 722 | *p++ = temp[digits];
|
| 723 | if (i < 3)
|
| 724 | *p++ = '.';
|
| 725 | index += step;
|
| 726 | }
|
| 727 | *p = '\0';
|
| 728 |
|
| 729 | return p;
|
| 730 | }
|
| 731 |
|
| 732 | static noinline_for_stack
|
| 733 | char *ip6_compressed_string(char *p, const char *addr)
|
| 734 | {
|
| 735 | int i, j, range;
|
| 736 | unsigned char zerolength[8];
|
| 737 | int longest = 1;
|
| 738 | int colonpos = -1;
|
| 739 | u16 word;
|
| 740 | u8 hi, lo;
|
| 741 | bool needcolon = false;
|
| 742 | bool useIPv4;
|
| 743 | struct in6_addr in6;
|
| 744 |
|
| 745 | memcpy(&in6, addr, sizeof(struct in6_addr));
|
| 746 |
|
| 747 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
|
| 748 |
|
| 749 | memset(zerolength, 0, sizeof(zerolength));
|
| 750 |
|
| 751 | if (useIPv4)
|
| 752 | range = 6;
|
| 753 | else
|
| 754 | range = 8;
|
| 755 |
|
| 756 |
|
| 757 | for (i = 0; i < range; i++) {
|
| 758 | for (j = i; j < range; j++) {
|
| 759 | if (in6.s6_addr16[j] != 0)
|
| 760 | break;
|
| 761 | zerolength[i]++;
|
| 762 | }
|
| 763 | }
|
| 764 | for (i = 0; i < range; i++) {
|
| 765 | if (zerolength[i] > longest) {
|
| 766 | longest = zerolength[i];
|
| 767 | colonpos = i;
|
| 768 | }
|
| 769 | }
|
| 770 | if (longest == 1)
|
| 771 | colonpos = -1;
|
| 772 |
|
| 773 |
|
| 774 | for (i = 0; i < range; i++) {
|
| 775 | if (i == colonpos) {
|
| 776 | if (needcolon || i == 0)
|
| 777 | *p++ = ':';
|
| 778 | *p++ = ':';
|
| 779 | needcolon = false;
|
| 780 | i += longest - 1;
|
| 781 | continue;
|
| 782 | }
|
| 783 | if (needcolon) {
|
| 784 | *p++ = ':';
|
| 785 | needcolon = false;
|
| 786 | }
|
| 787 |
|
| 788 | word = ntohs(in6.s6_addr16[i]);
|
| 789 | hi = word >> 8;
|
| 790 | lo = word & 0xff;
|
| 791 | if (hi) {
|
| 792 | if (hi > 0x0f)
|
| 793 | p = hex_byte_pack(p, hi);
|
| 794 | else
|
| 795 | *p++ = hex_asc_lo(hi);
|
| 796 | p = hex_byte_pack(p, lo);
|
| 797 | }
|
| 798 | else if (lo > 0x0f)
|
| 799 | p = hex_byte_pack(p, lo);
|
| 800 | else
|
| 801 | *p++ = hex_asc_lo(lo);
|
| 802 | needcolon = true;
|
| 803 | }
|
| 804 |
|
| 805 | if (useIPv4) {
|
| 806 | if (needcolon)
|
| 807 | *p++ = ':';
|
| 808 | p = ip4_string(p, &in6.s6_addr[12], "I4");
|
| 809 | }
|
| 810 | *p = '\0';
|
| 811 |
|
| 812 | return p;
|
| 813 | }
|
| 814 |
|
| 815 | static noinline_for_stack
|
| 816 | char *ip6_string(char *p, const char *addr, const char *fmt)
|
| 817 | {
|
| 818 | int i;
|
| 819 |
|
| 820 | for (i = 0; i < 8; i++) {
|
| 821 | p = hex_byte_pack(p, *addr++);
|
| 822 | p = hex_byte_pack(p, *addr++);
|
| 823 | if (fmt[0] == 'I' && i != 7)
|
| 824 | *p++ = ':';
|
| 825 | }
|
| 826 | *p = '\0';
|
| 827 |
|
| 828 | return p;
|
| 829 | }
|
| 830 |
|
| 831 | static noinline_for_stack
|
| 832 | char *ip6_addr_string(char *buf, char *end, const u8 *addr,
|
| 833 | struct printf_spec spec, const char *fmt)
|
| 834 | {
|
| 835 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
|
| 836 |
|
| 837 | if (fmt[0] == 'I' && fmt[2] == 'c')
|
| 838 | ip6_compressed_string(ip6_addr, addr);
|
| 839 | else
|
| 840 | ip6_string(ip6_addr, addr, fmt);
|
| 841 |
|
| 842 | return string(buf, end, ip6_addr, spec);
|
| 843 | }
|
| 844 |
|
| 845 | static noinline_for_stack
|
| 846 | char *ip4_addr_string(char *buf, char *end, const u8 *addr,
|
| 847 | struct printf_spec spec, const char *fmt)
|
| 848 | {
|
| 849 | char ip4_addr[sizeof("255.255.255.255")];
|
| 850 |
|
| 851 | ip4_string(ip4_addr, addr, fmt);
|
| 852 |
|
| 853 | return string(buf, end, ip4_addr, spec);
|
| 854 | }
|
| 855 |
|
| 856 | static noinline_for_stack
|
| 857 | char *uuid_string(char *buf, char *end, const u8 *addr,
|
| 858 | struct printf_spec spec, const char *fmt)
|
| 859 | {
|
| 860 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
|
| 861 | char *p = uuid;
|
| 862 | int i;
|
| 863 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
|
| 864 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
|
| 865 | const u8 *index = be;
|
| 866 | bool uc = false;
|
| 867 |
|
| 868 | switch (*(++fmt)) {
|
| 869 | case 'L':
|
| 870 | uc = true;
|
| 871 | case 'l':
|
| 872 | index = le;
|
| 873 | break;
|
| 874 | case 'B':
|
| 875 | uc = true;
|
| 876 | break;
|
| 877 | }
|
| 878 |
|
| 879 | for (i = 0; i < 16; i++) {
|
| 880 | p = hex_byte_pack(p, addr[index[i]]);
|
| 881 | switch (i) {
|
| 882 | case 3:
|
| 883 | case 5:
|
| 884 | case 7:
|
| 885 | case 9:
|
| 886 | *p++ = '-';
|
| 887 | break;
|
| 888 | }
|
| 889 | }
|
| 890 |
|
| 891 | *p = 0;
|
| 892 |
|
| 893 | if (uc) {
|
| 894 | p = uuid;
|
| 895 | do {
|
| 896 | *p = toupper(*p);
|
| 897 | } while (*(++p));
|
| 898 | }
|
| 899 |
|
| 900 | return string(buf, end, uuid, spec);
|
| 901 | }
|
| 902 |
|
| 903 | static
|
| 904 | char *netdev_feature_string(char *buf, char *end, const u8 *addr,
|
| 905 | struct printf_spec spec)
|
| 906 | {
|
| 907 | spec.flags |= SPECIAL | SMALL | ZEROPAD;
|
| 908 | if (spec.field_width == -1)
|
| 909 | spec.field_width = 2 + 2 * sizeof(netdev_features_t);
|
| 910 | spec.base = 16;
|
| 911 |
|
| 912 | return number(buf, end, *(const netdev_features_t *)addr, spec);
|
| 913 | }
|
| 914 |
|
| 915 | int kptr_restrict __read_mostly;
|
| 916 |
|
| 917 | |
| 918 | * Show a '%p' thing. A kernel extension is that the '%p' is followed
|
| 919 | * by an extra set of alphanumeric characters that are extended format
|
| 920 | * specifiers.
|
| 921 | *
|
| 922 | * Right now we handle:
|
| 923 | *
|
| 924 | * - 'F' For symbolic function descriptor pointers with offset
|
| 925 | * - 'f' For simple symbolic function names without offset
|
| 926 | * - 'S' For symbolic direct pointers with offset
|
| 927 | * - 's' For symbolic direct pointers without offset
|
| 928 | * - 'B' For backtraced symbolic direct pointers with offset
|
| 929 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
|
| 930 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
|
| 931 | * - 'M' For a 6-byte MAC address, it prints the address in the
|
| 932 | * usual colon-separated hex notation
|
| 933 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons
|
| 934 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address
|
| 935 | * with a dash-separated hex notation
|
| 936 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
|
| 937 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
|
| 938 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's
|
| 939 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses
|
| 940 | * IPv6 omits the colons (01020304...0f)
|
| 941 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
|
| 942 | * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
|
| 943 | * - 'I6c' for IPv6 addresses printed as specified by
|
| 944 | * http://tools.ietf.org/html/rfc5952
|
| 945 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
|
| 946 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
|
| 947 | * Options for %pU are:
|
| 948 | * b big endian lower case hex (default)
|
| 949 | * B big endian UPPER case hex
|
| 950 | * l little endian lower case hex
|
| 951 | * L little endian UPPER case hex
|
| 952 | * big endian output byte order is:
|
| 953 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
|
| 954 | * little endian output byte order is:
|
| 955 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
|
| 956 | * - 'V' For a struct va_format which contains a format string * and va_list *,
|
| 957 | * call vsnprintf(->format, *->va_list).
|
| 958 | * Implements a "recursive vsnprintf".
|
| 959 | * Do not use this feature without some mechanism to verify the
|
| 960 | * correctness of the format string and va_list arguments.
|
| 961 | * - 'K' For a kernel pointer that should be hidden from unprivileged users
|
| 962 | * - 'NF' For a netdev_features_t
|
| 963 | *
|
| 964 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
|
| 965 | * function pointers are really function descriptors, which contain a
|
| 966 | * pointer to the real address.
|
| 967 |
|
| 968 | static noinline_for_stack
|
| 969 | char *pointer(const char *fmt, char *buf, char *end, void *ptr,
|
| 970 | struct printf_spec spec)
|
| 971 | {
|
| 972 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0);
|
| 973 |
|
| 974 | if (!ptr && *fmt != 'K') {
|
| 975 | |
| 976 | * Print (null) with the same width as a pointer so it makes
|
| 977 | * tabular output look nice.
|
| 978 |
|
| 979 | if (spec.field_width == -1)
|
| 980 | spec.field_width = default_width;
|
| 981 | return string(buf, end, "(null)", spec);
|
| 982 | }
|
| 983 |
|
| 984 | switch (*fmt) {
|
| 985 | case 'F':
|
| 986 | case 'f':
|
| 987 | ptr = dereference_function_descriptor(ptr);
|
| 988 |
|
| 989 | case 'S':
|
| 990 | case 's':
|
| 991 | case 'B':
|
| 992 | return symbol_string(buf, end, ptr, spec, *fmt);
|
| 993 | case 'R':
|
| 994 | case 'r':
|
| 995 | return resource_string(buf, end, ptr, spec, fmt);
|
| 996 | case 'M':
|
| 997 | case 'm':
|
| 998 |
|
| 999 | return mac_address_string(buf, end, ptr, spec, fmt);
|
| 1000 | case 'I': |
| 1001 | * 4: 1.2.3.4
|
| 1002 | * 6: 0001:0203:...:0708
|
| 1003 | * 6c: 1::708 or 1::1.2.3.4
|
| 1004 |
|
| 1005 | case 'i': |
| 1006 | * 4: 001.002.003.004
|
| 1007 | * 6: 000102...0f
|
| 1008 |
|
| 1009 | switch (fmt[1]) {
|
| 1010 | case '6':
|
| 1011 | return ip6_addr_string(buf, end, ptr, spec, fmt);
|
| 1012 | case '4':
|
| 1013 | return ip4_addr_string(buf, end, ptr, spec, fmt);
|
| 1014 | }
|
| 1015 | break;
|
| 1016 | case 'U':
|
| 1017 | return uuid_string(buf, end, ptr, spec, fmt);
|
| 1018 | case 'V':
|
| 1019 | {
|
| 1020 | va_list va;
|
| 1021 |
|
| 1022 | va_copy(va, *((struct va_format *)ptr)->va);
|
| 1023 | buf += vsnprintf(buf, end > buf ? end - buf : 0,
|
| 1024 | ((struct va_format *)ptr)->fmt, va);
|
| 1025 | va_end(va);
|
| 1026 | return buf;
|
| 1027 | }
|
| 1028 | case 'K':
|
| 1029 | |
| 1030 | * %pK cannot be used in IRQ context because its test
|
| 1031 | * for CAP_SYSLOG would be meaningless.
|
| 1032 |
|
| 1033 | if (in_irq() || in_serving_softirq() || in_nmi()) {
|
| 1034 | if (spec.field_width == -1)
|
| 1035 | spec.field_width = default_width;
|
| 1036 | return string(buf, end, "pK-error", spec);
|
| 1037 | }
|
| 1038 | if (!((kptr_restrict == 0) ||
|
| 1039 | (kptr_restrict == 1 &&
|
| 1040 | has_capability_noaudit(current, CAP_SYSLOG))))
|
| 1041 | ptr = NULL;
|
| 1042 | break;
|
| 1043 | case 'N':
|
| 1044 | switch (fmt[1]) {
|
| 1045 | case 'F':
|
| 1046 | return netdev_feature_string(buf, end, ptr, spec);
|
| 1047 | }
|
| 1048 | break;
|
| 1049 | }
|
| 1050 | spec.flags |= SMALL;
|
| 1051 | if (spec.field_width == -1) {
|
| 1052 | spec.field_width = default_width;
|
| 1053 | spec.flags |= ZEROPAD;
|
| 1054 | }
|
| 1055 | spec.base = 16;
|
| 1056 |
|
| 1057 | return number(buf, end, (unsigned long) ptr, spec);
|
| 1058 | }
|
| 1059 |
|
| 1060 | |
| 1061 | * Helper function to decode printf style format.
|
| 1062 | * Each call decode a token from the format and return the
|
| 1063 | * number of characters read (or likely the delta where it wants
|
| 1064 | * to go on the next call).
|
| 1065 | * The decoded token is returned through the parameters
|
| 1066 | *
|
| 1067 | * 'h', 'l', or 'L' for integer fields
|
| 1068 | * 'z' support added 23/7/1999 S.H.
|
| 1069 | * 'z' changed to 'Z' --davidm 1/25/99
|
| 1070 | * 't' added for ptrdiff_t
|
| 1071 | *
|
| 1072 | * @fmt: the format string
|
| 1073 | * @type of the token returned
|
| 1074 | * @flags: various flags such as +, -, # tokens..
|
| 1075 | * @field_width: overwritten width
|
| 1076 | * @base: base of the number (octal, hex, ...)
|
| 1077 | * @precision: precision of a number
|
| 1078 | * @qualifier: qualifier of a number (long, size_t, ...)
|
| 1079 |
|
| 1080 | static noinline_for_stack
|
| 1081 | int format_decode(const char *fmt, struct printf_spec *spec)
|
| 1082 | {
|
| 1083 | const char *start = fmt;
|
| 1084 |
|
| 1085 |
|
| 1086 | if (spec->type == FORMAT_TYPE_WIDTH) {
|
| 1087 | if (spec->field_width < 0) {
|
| 1088 | spec->field_width = -spec->field_width;
|
| 1089 | spec->flags |= LEFT;
|
| 1090 | }
|
| 1091 | spec->type = FORMAT_TYPE_NONE;
|
| 1092 | goto precision;
|
| 1093 | }
|
| 1094 |
|
| 1095 |
|
| 1096 | if (spec->type == FORMAT_TYPE_PRECISION) {
|
| 1097 | if (spec->precision < 0)
|
| 1098 | spec->precision = 0;
|
| 1099 |
|
| 1100 | spec->type = FORMAT_TYPE_NONE;
|
| 1101 | goto qualifier;
|
| 1102 | }
|
| 1103 |
|
| 1104 |
|
| 1105 | spec->type = FORMAT_TYPE_NONE;
|
| 1106 |
|
| 1107 | for (; *fmt ; ++fmt) {
|
| 1108 | if (*fmt == '%')
|
| 1109 | break;
|
| 1110 | }
|
| 1111 |
|
| 1112 |
|
| 1113 | if (fmt != start || !*fmt)
|
| 1114 | return fmt - start;
|
| 1115 |
|
| 1116 |
|
| 1117 | spec->flags = 0;
|
| 1118 |
|
| 1119 | while (1) {
|
| 1120 | bool found = true;
|
| 1121 |
|
| 1122 | ++fmt;
|
| 1123 |
|
| 1124 | switch (*fmt) {
|
| 1125 | case '-': spec->flags |= LEFT; break;
|
| 1126 | case '+': spec->flags |= PLUS; break;
|
| 1127 | case ' ': spec->flags |= SPACE; break;
|
| 1128 | case '#': spec->flags |= SPECIAL; break;
|
| 1129 | case '0': spec->flags |= ZEROPAD; break;
|
| 1130 | default: found = false;
|
| 1131 | }
|
| 1132 |
|
| 1133 | if (!found)
|
| 1134 | break;
|
| 1135 | }
|
| 1136 |
|
| 1137 |
|
| 1138 | spec->field_width = -1;
|
| 1139 |
|
| 1140 | if (isdigit(*fmt))
|
| 1141 | spec->field_width = skip_atoi(&fmt);
|
| 1142 | else if (*fmt == '*') {
|
| 1143 |
|
| 1144 | spec->type = FORMAT_TYPE_WIDTH;
|
| 1145 | return ++fmt - start;
|
| 1146 | }
|
| 1147 |
|
| 1148 | precision:
|
| 1149 |
|
| 1150 | spec->precision = -1;
|
| 1151 | if (*fmt == '.') {
|
| 1152 | ++fmt;
|
| 1153 | if (isdigit(*fmt)) {
|
| 1154 | spec->precision = skip_atoi(&fmt);
|
| 1155 | if (spec->precision < 0)
|
| 1156 | spec->precision = 0;
|
| 1157 | } else if (*fmt == '*') {
|
| 1158 |
|
| 1159 | spec->type = FORMAT_TYPE_PRECISION;
|
| 1160 | return ++fmt - start;
|
| 1161 | }
|
| 1162 | }
|
| 1163 |
|
| 1164 | qualifier:
|
| 1165 |
|
| 1166 | spec->qualifier = -1;
|
| 1167 | if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
|
| 1168 | _tolower(*fmt) == 'z' || *fmt == 't') {
|
| 1169 | spec->qualifier = *fmt++;
|
| 1170 | if (unlikely(spec->qualifier == *fmt)) {
|
| 1171 | if (spec->qualifier == 'l') {
|
| 1172 | spec->qualifier = 'L';
|
| 1173 | ++fmt;
|
| 1174 | } else if (spec->qualifier == 'h') {
|
| 1175 | spec->qualifier = 'H';
|
| 1176 | ++fmt;
|
| 1177 | }
|
| 1178 | }
|
| 1179 | }
|
| 1180 |
|
| 1181 |
|
| 1182 | spec->base = 10;
|
| 1183 | switch (*fmt) {
|
| 1184 | case 'c':
|
| 1185 | spec->type = FORMAT_TYPE_CHAR;
|
| 1186 | return ++fmt - start;
|
| 1187 |
|
| 1188 | case 's':
|
| 1189 | spec->type = FORMAT_TYPE_STR;
|
| 1190 | return ++fmt - start;
|
| 1191 |
|
| 1192 | case 'p':
|
| 1193 | spec->type = FORMAT_TYPE_PTR;
|
| 1194 | return fmt - start;
|
| 1195 |
|
| 1196 |
|
| 1197 | case 'n':
|
| 1198 | spec->type = FORMAT_TYPE_NRCHARS;
|
| 1199 | return ++fmt - start;
|
| 1200 |
|
| 1201 | case '%':
|
| 1202 | spec->type = FORMAT_TYPE_PERCENT_CHAR;
|
| 1203 | return ++fmt - start;
|
| 1204 |
|
| 1205 |
|
| 1206 | case 'o':
|
| 1207 | spec->base = 8;
|
| 1208 | break;
|
| 1209 |
|
| 1210 | case 'x':
|
| 1211 | spec->flags |= SMALL;
|
| 1212 |
|
| 1213 | case 'X':
|
| 1214 | spec->base = 16;
|
| 1215 | break;
|
| 1216 |
|
| 1217 | case 'd':
|
| 1218 | case 'i':
|
| 1219 | spec->flags |= SIGN;
|
| 1220 | case 'u':
|
| 1221 | break;
|
| 1222 |
|
| 1223 | default:
|
| 1224 | spec->type = FORMAT_TYPE_INVALID;
|
| 1225 | return fmt - start;
|
| 1226 | }
|
| 1227 |
|
| 1228 | if (spec->qualifier == 'L')
|
| 1229 | spec->type = FORMAT_TYPE_LONG_LONG;
|
| 1230 | else if (spec->qualifier == 'l') {
|
| 1231 | if (spec->flags & SIGN)
|
| 1232 | spec->type = FORMAT_TYPE_LONG;
|
| 1233 | else
|
| 1234 | spec->type = FORMAT_TYPE_ULONG;
|
| 1235 | } else if (_tolower(spec->qualifier) == 'z') {
|
| 1236 | spec->type = FORMAT_TYPE_SIZE_T;
|
| 1237 | } else if (spec->qualifier == 't') {
|
| 1238 | spec->type = FORMAT_TYPE_PTRDIFF;
|
| 1239 | } else if (spec->qualifier == 'H') {
|
| 1240 | if (spec->flags & SIGN)
|
| 1241 | spec->type = FORMAT_TYPE_BYTE;
|
| 1242 | else
|
| 1243 | spec->type = FORMAT_TYPE_UBYTE;
|
| 1244 | } else if (spec->qualifier == 'h') {
|
| 1245 | if (spec->flags & SIGN)
|
| 1246 | spec->type = FORMAT_TYPE_SHORT;
|
| 1247 | else
|
| 1248 | spec->type = FORMAT_TYPE_USHORT;
|
| 1249 | } else {
|
| 1250 | if (spec->flags & SIGN)
|
| 1251 | spec->type = FORMAT_TYPE_INT;
|
| 1252 | else
|
| 1253 | spec->type = FORMAT_TYPE_UINT;
|
| 1254 | }
|
| 1255 |
|
| 1256 | return ++fmt - start;
|
| 1257 | }
|
| 1258 |
|
| 1259 | |
| 1260 | * vsnprintf - Format a string and place it in a buffer
|
| 1261 | * @buf: The buffer to place the result into
|
| 1262 | * @size: The size of the buffer, including the trailing null space
|
| 1263 | * @fmt: The format string to use
|
| 1264 | * @args: Arguments for the format string
|
| 1265 | *
|
| 1266 | * This function follows C99 vsnprintf, but has some extensions:
|
| 1267 | * %pS output the name of a text symbol with offset
|
| 1268 | * %ps output the name of a text symbol without offset
|
| 1269 | * %pF output the name of a function pointer with its offset
|
| 1270 | * %pf output the name of a function pointer without its offset
|
| 1271 | * %pB output the name of a backtrace symbol with its offset
|
| 1272 | * %pR output the address range in a struct resource with decoded flags
|
| 1273 | * %pr output the address range in a struct resource with raw flags
|
| 1274 | * %pM output a 6-byte MAC address with colons
|
| 1275 | * %pm output a 6-byte MAC address without colons
|
| 1276 | * %pI4 print an IPv4 address without leading zeros
|
| 1277 | * %pi4 print an IPv4 address with leading zeros
|
| 1278 | * %pI6 print an IPv6 address with colons
|
| 1279 | * %pi6 print an IPv6 address without colons
|
| 1280 | * %pI6c print an IPv6 address as specified by RFC 5952
|
| 1281 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
|
| 1282 | * case.
|
| 1283 | * %n is ignored
|
| 1284 | *
|
| 1285 | * The return value is the number of characters which would
|
| 1286 | * be generated for the given input, excluding the trailing
|
| 1287 | * '\0', as per ISO C99. If you want to have the exact
|
| 1288 | * number of characters written into @buf as return value
|
| 1289 | * (not including the trailing '\0'), use vscnprintf(). If the
|
| 1290 | * return is greater than or equal to @size, the resulting
|
| 1291 | * string is truncated.
|
| 1292 | *
|
| 1293 | * If you're not already dealing with a va_list consider using snprintf().
|
| 1294 |
|
| 1295 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
|
| 1296 | {
|
| 1297 | unsigned long long num;
|
| 1298 | char *str, *end;
|
| 1299 | struct printf_spec spec = {0};
|
| 1300 |
|
| 1301 | |
| 1302 | used for unknown buffer sizes.
|
| 1303 | if (WARN_ON_ONCE((int) size < 0))
|
| 1304 | return 0;
|
| 1305 |
|
| 1306 | str = buf;
|
| 1307 | end = buf + size;
|
| 1308 |
|
| 1309 |
|
| 1310 | if (end < buf) {
|
| 1311 | end = ((void *)-1);
|
| 1312 | size = end - buf;
|
| 1313 | }
|
| 1314 |
|
| 1315 | while (*fmt) {
|
| 1316 | const char *old_fmt = fmt;
|
| 1317 | int read = format_decode(fmt, &spec);
|
| 1318 |
|
| 1319 | fmt += read;
|
| 1320 |
|
| 1321 | switch (spec.type) {
|
| 1322 | case FORMAT_TYPE_NONE: {
|
| 1323 | int copy = read;
|
| 1324 | if (str < end) {
|
| 1325 | if (copy > end - str)
|
| 1326 | copy = end - str;
|
| 1327 | memcpy(str, old_fmt, copy);
|
| 1328 | }
|
| 1329 | str += read;
|
| 1330 | break;
|
| 1331 | }
|
| 1332 |
|
| 1333 | case FORMAT_TYPE_WIDTH:
|
| 1334 | spec.field_width = va_arg(args, int);
|
| 1335 | break;
|
| 1336 |
|
| 1337 | case FORMAT_TYPE_PRECISION:
|
| 1338 | spec.precision = va_arg(args, int);
|
| 1339 | break;
|
| 1340 |
|
| 1341 | case FORMAT_TYPE_CHAR: {
|
| 1342 | char c;
|
| 1343 |
|
| 1344 | if (!(spec.flags & LEFT)) {
|
| 1345 | while (--spec.field_width > 0) {
|
| 1346 | if (str < end)
|
| 1347 | *str = ' ';
|
| 1348 | ++str;
|
| 1349 |
|
| 1350 | }
|
| 1351 | }
|
| 1352 | c = (unsigned char) va_arg(args, int);
|
| 1353 | if (str < end)
|
| 1354 | *str = c;
|
| 1355 | ++str;
|
| 1356 | while (--spec.field_width > 0) {
|
| 1357 | if (str < end)
|
| 1358 | *str = ' ';
|
| 1359 | ++str;
|
| 1360 | }
|
| 1361 | break;
|
| 1362 | }
|
| 1363 |
|
| 1364 | case FORMAT_TYPE_STR:
|
| 1365 | str = string(str, end, va_arg(args, char *), spec);
|
| 1366 | break;
|
| 1367 |
|
| 1368 | case FORMAT_TYPE_PTR:
|
| 1369 | str = pointer(fmt+1, str, end, va_arg(args, void *),
|
| 1370 | spec);
|
| 1371 | while (isalnum(*fmt))
|
| 1372 | fmt++;
|
| 1373 | break;
|
| 1374 |
|
| 1375 | case FORMAT_TYPE_PERCENT_CHAR:
|
| 1376 | if (str < end)
|
| 1377 | *str = '%';
|
| 1378 | ++str;
|
| 1379 | break;
|
| 1380 |
|
| 1381 | case FORMAT_TYPE_INVALID:
|
| 1382 | if (str < end)
|
| 1383 | *str = '%';
|
| 1384 | ++str;
|
| 1385 | break;
|
| 1386 |
|
| 1387 | case FORMAT_TYPE_NRCHARS: {
|
| 1388 | u8 qualifier = spec.qualifier;
|
| 1389 |
|
| 1390 | if (qualifier == 'l') {
|
| 1391 | long *ip = va_arg(args, long *);
|
| 1392 | *ip = (str - buf);
|
| 1393 | } else if (_tolower(qualifier) == 'z') {
|
| 1394 | size_t *ip = va_arg(args, size_t *);
|
| 1395 | *ip = (str - buf);
|
| 1396 | } else {
|
| 1397 | int *ip = va_arg(args, int *);
|
| 1398 | *ip = (str - buf);
|
| 1399 | }
|
| 1400 | break;
|
| 1401 | }
|
| 1402 |
|
| 1403 | default:
|
| 1404 | switch (spec.type) {
|
| 1405 | case FORMAT_TYPE_LONG_LONG:
|
| 1406 | num = va_arg(args, long long);
|
| 1407 | break;
|
| 1408 | case FORMAT_TYPE_ULONG:
|
| 1409 | num = va_arg(args, unsigned long);
|
| 1410 | break;
|
| 1411 | case FORMAT_TYPE_LONG:
|
| 1412 | num = va_arg(args, long);
|
| 1413 | break;
|
| 1414 | case FORMAT_TYPE_SIZE_T:
|
| 1415 | num = va_arg(args, size_t);
|
| 1416 | break;
|
| 1417 | case FORMAT_TYPE_PTRDIFF:
|
| 1418 | num = va_arg(args, ptrdiff_t);
|
| 1419 | break;
|
| 1420 | case FORMAT_TYPE_UBYTE:
|
| 1421 | num = (unsigned char) va_arg(args, int);
|
| 1422 | break;
|
| 1423 | case FORMAT_TYPE_BYTE:
|
| 1424 | num = (signed char) va_arg(args, int);
|
| 1425 | break;
|
| 1426 | case FORMAT_TYPE_USHORT:
|
| 1427 | num = (unsigned short) va_arg(args, int);
|
| 1428 | break;
|
| 1429 | case FORMAT_TYPE_SHORT:
|
| 1430 | num = (short) va_arg(args, int);
|
| 1431 | break;
|
| 1432 | case FORMAT_TYPE_INT:
|
| 1433 | num = (int) va_arg(args, int);
|
| 1434 | break;
|
| 1435 | default:
|
| 1436 | num = va_arg(args, unsigned int);
|
| 1437 | }
|
| 1438 |
|
| 1439 | str = number(str, end, num, spec);
|
| 1440 | }
|
| 1441 | }
|
| 1442 |
|
| 1443 | if (size > 0) {
|
| 1444 | if (str < end)
|
| 1445 | *str = '\0';
|
| 1446 | else
|
| 1447 | end[-1] = '\0';
|
| 1448 | }
|
| 1449 |
|
| 1450 |
|
| 1451 | return str-buf;
|
| 1452 |
|
| 1453 | }
|
| 1454 | EXPORT_SYMBOL(vsnprintf);
|
| 1455 |
|
| 1456 | |
| 1457 | * vscnprintf - Format a string and place it in a buffer
|
| 1458 | * @buf: The buffer to place the result into
|
| 1459 | * @size: The size of the buffer, including the trailing null space
|
| 1460 | * @fmt: The format string to use
|
| 1461 | * @args: Arguments for the format string
|
| 1462 | *
|
| 1463 | * The return value is the number of characters which have been written into
|
| 1464 | * the @buf not including the trailing '\0'. If @size is == 0 the function
|
| 1465 | * returns 0.
|
| 1466 | *
|
| 1467 | * If you're not already dealing with a va_list consider using scnprintf().
|
| 1468 | *
|
| 1469 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 1470 |
|
| 1471 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
|
| 1472 | {
|
| 1473 | int i;
|
| 1474 |
|
| 1475 | i = vsnprintf(buf, size, fmt, args);
|
| 1476 |
|
| 1477 | if (likely(i < size))
|
| 1478 | return i;
|
| 1479 | if (size != 0)
|
| 1480 | return size - 1;
|
| 1481 | return 0;
|
| 1482 | }
|
| 1483 | EXPORT_SYMBOL(vscnprintf);
|
| 1484 |
|
| 1485 | |
| 1486 | * snprintf - Format a string and place it in a buffer
|
| 1487 | * @buf: The buffer to place the result into
|
| 1488 | * @size: The size of the buffer, including the trailing null space
|
| 1489 | * @fmt: The format string to use
|
| 1490 | * @...: Arguments for the format string
|
| 1491 | *
|
| 1492 | * The return value is the number of characters which would be
|
| 1493 | * generated for the given input, excluding the trailing null,
|
| 1494 | * as per ISO C99. If the return is greater than or equal to
|
| 1495 | * @size, the resulting string is truncated.
|
| 1496 | *
|
| 1497 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 1498 |
|
| 1499 | int snprintf(char *buf, size_t size, const char *fmt, ...)
|
| 1500 | {
|
| 1501 | va_list args;
|
| 1502 | int i;
|
| 1503 |
|
| 1504 | va_start(args, fmt);
|
| 1505 | i = vsnprintf(buf, size, fmt, args);
|
| 1506 | va_end(args);
|
| 1507 |
|
| 1508 | return i;
|
| 1509 | }
|
| 1510 | EXPORT_SYMBOL(snprintf);
|
| 1511 |
|
| 1512 | |
| 1513 | * scnprintf - Format a string and place it in a buffer
|
| 1514 | * @buf: The buffer to place the result into
|
| 1515 | * @size: The size of the buffer, including the trailing null space
|
| 1516 | * @fmt: The format string to use
|
| 1517 | * @...: Arguments for the format string
|
| 1518 | *
|
| 1519 | * The return value is the number of characters written into @buf not including
|
| 1520 | * the trailing '\0'. If @size is == 0 the function returns 0.
|
| 1521 |
|
| 1522 |
|
| 1523 | int scnprintf(char *buf, size_t size, const char *fmt, ...)
|
| 1524 | {
|
| 1525 | va_list args;
|
| 1526 | int i;
|
| 1527 |
|
| 1528 | va_start(args, fmt);
|
| 1529 | i = vscnprintf(buf, size, fmt, args);
|
| 1530 | va_end(args);
|
| 1531 |
|
| 1532 | return i;
|
| 1533 | }
|
| 1534 | EXPORT_SYMBOL(scnprintf);
|
| 1535 |
|
| 1536 | |
| 1537 | * vsprintf - Format a string and place it in a buffer
|
| 1538 | * @buf: The buffer to place the result into
|
| 1539 | * @fmt: The format string to use
|
| 1540 | * @args: Arguments for the format string
|
| 1541 | *
|
| 1542 | * The function returns the number of characters written
|
| 1543 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
|
| 1544 | * buffer overflows.
|
| 1545 | *
|
| 1546 | * If you're not already dealing with a va_list consider using sprintf().
|
| 1547 | *
|
| 1548 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 1549 |
|
| 1550 | int vsprintf(char *buf, const char *fmt, va_list args)
|
| 1551 | {
|
| 1552 | return vsnprintf(buf, INT_MAX, fmt, args);
|
| 1553 | }
|
| 1554 | EXPORT_SYMBOL(vsprintf);
|
| 1555 |
|
| 1556 | |
| 1557 | * sprintf - Format a string and place it in a buffer
|
| 1558 | * @buf: The buffer to place the result into
|
| 1559 | * @fmt: The format string to use
|
| 1560 | * @...: Arguments for the format string
|
| 1561 | *
|
| 1562 | * The function returns the number of characters written
|
| 1563 | * into @buf. Use snprintf() or scnprintf() in order to avoid
|
| 1564 | * buffer overflows.
|
| 1565 | *
|
| 1566 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 1567 |
|
| 1568 | int sprintf(char *buf, const char *fmt, ...)
|
| 1569 | {
|
| 1570 | va_list args;
|
| 1571 | int i;
|
| 1572 |
|
| 1573 | va_start(args, fmt);
|
| 1574 | i = vsnprintf(buf, INT_MAX, fmt, args);
|
| 1575 | va_end(args);
|
| 1576 |
|
| 1577 | return i;
|
| 1578 | }
|
| 1579 | EXPORT_SYMBOL(sprintf);
|
| 1580 |
|
| 1581 | #ifdef CONFIG_BINARY_PRINTF
|
| 1582 | |
| 1583 | * bprintf service:
|
| 1584 | * vbin_printf() - VA arguments to binary data
|
| 1585 | * bstr_printf() - Binary data to text string
|
| 1586 |
|
| 1587 |
|
| 1588 | |
| 1589 | * vbin_printf - Parse a format string and place args' binary value in a buffer
|
| 1590 | * @bin_buf: The buffer to place args' binary value
|
| 1591 | * @size: The size of the buffer(by words(32bits), not characters)
|
| 1592 | * @fmt: The format string to use
|
| 1593 | * @args: Arguments for the format string
|
| 1594 | *
|
| 1595 | * The format follows C99 vsnprintf, except %n is ignored, and its argument
|
| 1596 | * is skiped.
|
| 1597 | *
|
| 1598 | * The return value is the number of words(32bits) which would be generated for
|
| 1599 | * the given input.
|
| 1600 | *
|
| 1601 | * NOTE:
|
| 1602 | * If the return value is greater than @size, the resulting bin_buf is NOT
|
| 1603 | * valid for bstr_printf().
|
| 1604 |
|
| 1605 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
|
| 1606 | {
|
| 1607 | struct printf_spec spec = {0};
|
| 1608 | char *str, *end;
|
| 1609 |
|
| 1610 | str = (char *)bin_buf;
|
| 1611 | end = (char *)(bin_buf + size);
|
| 1612 |
|
| 1613 | #define save_arg(type) \
|
| 1614 | do { \
|
| 1615 | if (sizeof(type) == 8) { \
|
| 1616 | unsigned long long value; \
|
| 1617 | str = PTR_ALIGN(str, sizeof(u32)); \
|
| 1618 | value = va_arg(args, unsigned long long); \
|
| 1619 | if (str + sizeof(type) <= end) { \
|
| 1620 | *(u32 *)str = *(u32 *)&value; \
|
| 1621 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \
|
| 1622 | } \
|
| 1623 | } else { \
|
| 1624 | unsigned long value; \
|
| 1625 | str = PTR_ALIGN(str, sizeof(type)); \
|
| 1626 | value = va_arg(args, int); \
|
| 1627 | if (str + sizeof(type) <= end) \
|
| 1628 | *(typeof(type) *)str = (type)value; \
|
| 1629 | } \
|
| 1630 | str += sizeof(type); \
|
| 1631 | } while (0)
|
| 1632 |
|
| 1633 | while (*fmt) {
|
| 1634 | int read = format_decode(fmt, &spec);
|
| 1635 |
|
| 1636 | fmt += read;
|
| 1637 |
|
| 1638 | switch (spec.type) {
|
| 1639 | case FORMAT_TYPE_NONE:
|
| 1640 | case FORMAT_TYPE_INVALID:
|
| 1641 | case FORMAT_TYPE_PERCENT_CHAR:
|
| 1642 | break;
|
| 1643 |
|
| 1644 | case FORMAT_TYPE_WIDTH:
|
| 1645 | case FORMAT_TYPE_PRECISION:
|
| 1646 | save_arg(int);
|
| 1647 | break;
|
| 1648 |
|
| 1649 | case FORMAT_TYPE_CHAR:
|
| 1650 | save_arg(char);
|
| 1651 | break;
|
| 1652 |
|
| 1653 | case FORMAT_TYPE_STR: {
|
| 1654 | const char *save_str = va_arg(args, char *);
|
| 1655 | size_t len;
|
| 1656 |
|
| 1657 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
|
| 1658 | || (unsigned long)save_str < PAGE_SIZE)
|
| 1659 | save_str = "(null)";
|
| 1660 | len = strlen(save_str) + 1;
|
| 1661 | if (str + len < end)
|
| 1662 | memcpy(str, save_str, len);
|
| 1663 | str += len;
|
| 1664 | break;
|
| 1665 | }
|
| 1666 |
|
| 1667 | case FORMAT_TYPE_PTR:
|
| 1668 | save_arg(void *);
|
| 1669 |
|
| 1670 | while (isalnum(*fmt))
|
| 1671 | fmt++;
|
| 1672 | break;
|
| 1673 |
|
| 1674 | case FORMAT_TYPE_NRCHARS: {
|
| 1675 |
|
| 1676 | u8 qualifier = spec.qualifier;
|
| 1677 | void *skip_arg;
|
| 1678 | if (qualifier == 'l')
|
| 1679 | skip_arg = va_arg(args, long *);
|
| 1680 | else if (_tolower(qualifier) == 'z')
|
| 1681 | skip_arg = va_arg(args, size_t *);
|
| 1682 | else
|
| 1683 | skip_arg = va_arg(args, int *);
|
| 1684 | break;
|
| 1685 | }
|
| 1686 |
|
| 1687 | default:
|
| 1688 | switch (spec.type) {
|
| 1689 |
|
| 1690 | case FORMAT_TYPE_LONG_LONG:
|
| 1691 | save_arg(long long);
|
| 1692 | break;
|
| 1693 | case FORMAT_TYPE_ULONG:
|
| 1694 | case FORMAT_TYPE_LONG:
|
| 1695 | save_arg(unsigned long);
|
| 1696 | break;
|
| 1697 | case FORMAT_TYPE_SIZE_T:
|
| 1698 | save_arg(size_t);
|
| 1699 | break;
|
| 1700 | case FORMAT_TYPE_PTRDIFF:
|
| 1701 | save_arg(ptrdiff_t);
|
| 1702 | break;
|
| 1703 | case FORMAT_TYPE_UBYTE:
|
| 1704 | case FORMAT_TYPE_BYTE:
|
| 1705 | save_arg(char);
|
| 1706 | break;
|
| 1707 | case FORMAT_TYPE_USHORT:
|
| 1708 | case FORMAT_TYPE_SHORT:
|
| 1709 | save_arg(short);
|
| 1710 | break;
|
| 1711 | default:
|
| 1712 | save_arg(int);
|
| 1713 | }
|
| 1714 | }
|
| 1715 | }
|
| 1716 |
|
| 1717 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
|
| 1718 | #undef save_arg
|
| 1719 | }
|
| 1720 | EXPORT_SYMBOL_GPL(vbin_printf);
|
| 1721 |
|
| 1722 | |
| 1723 | * bstr_printf - Format a string from binary arguments and place it in a buffer
|
| 1724 | * @buf: The buffer to place the result into
|
| 1725 | * @size: The size of the buffer, including the trailing null space
|
| 1726 | * @fmt: The format string to use
|
| 1727 | * @bin_buf: Binary arguments for the format string
|
| 1728 | *
|
| 1729 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets
|
| 1730 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
|
| 1731 | * a binary buffer that generated by vbin_printf.
|
| 1732 | *
|
| 1733 | * The format follows C99 vsnprintf, but has some extensions:
|
| 1734 | * see vsnprintf comment for details.
|
| 1735 | *
|
| 1736 | * The return value is the number of characters which would
|
| 1737 | * be generated for the given input, excluding the trailing
|
| 1738 | * '\0', as per ISO C99. If you want to have the exact
|
| 1739 | * number of characters written into @buf as return value
|
| 1740 | * (not including the trailing '\0'), use vscnprintf(). If the
|
| 1741 | * return is greater than or equal to @size, the resulting
|
| 1742 | * string is truncated.
|
| 1743 |
|
| 1744 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
|
| 1745 | {
|
| 1746 | struct printf_spec spec = {0};
|
| 1747 | char *str, *end;
|
| 1748 | const char *args = (const char *)bin_buf;
|
| 1749 |
|
| 1750 | if (WARN_ON_ONCE((int) size < 0))
|
| 1751 | return 0;
|
| 1752 |
|
| 1753 | str = buf;
|
| 1754 | end = buf + size;
|
| 1755 |
|
| 1756 | #define get_arg(type) \
|
| 1757 | ({ \
|
| 1758 | typeof(type) value; \
|
| 1759 | if (sizeof(type) == 8) { \
|
| 1760 | args = PTR_ALIGN(args, sizeof(u32)); \
|
| 1761 | *(u32 *)&value = *(u32 *)args; \
|
| 1762 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \
|
| 1763 | } else { \
|
| 1764 | args = PTR_ALIGN(args, sizeof(type)); \
|
| 1765 | value = *(typeof(type) *)args; \
|
| 1766 | } \
|
| 1767 | args += sizeof(type); \
|
| 1768 | value; \
|
| 1769 | })
|
| 1770 |
|
| 1771 |
|
| 1772 | if (end < buf) {
|
| 1773 | end = ((void *)-1);
|
| 1774 | size = end - buf;
|
| 1775 | }
|
| 1776 |
|
| 1777 | while (*fmt) {
|
| 1778 | const char *old_fmt = fmt;
|
| 1779 | int read = format_decode(fmt, &spec);
|
| 1780 |
|
| 1781 | fmt += read;
|
| 1782 |
|
| 1783 | switch (spec.type) {
|
| 1784 | case FORMAT_TYPE_NONE: {
|
| 1785 | int copy = read;
|
| 1786 | if (str < end) {
|
| 1787 | if (copy > end - str)
|
| 1788 | copy = end - str;
|
| 1789 | memcpy(str, old_fmt, copy);
|
| 1790 | }
|
| 1791 | str += read;
|
| 1792 | break;
|
| 1793 | }
|
| 1794 |
|
| 1795 | case FORMAT_TYPE_WIDTH:
|
| 1796 | spec.field_width = get_arg(int);
|
| 1797 | break;
|
| 1798 |
|
| 1799 | case FORMAT_TYPE_PRECISION:
|
| 1800 | spec.precision = get_arg(int);
|
| 1801 | break;
|
| 1802 |
|
| 1803 | case FORMAT_TYPE_CHAR: {
|
| 1804 | char c;
|
| 1805 |
|
| 1806 | if (!(spec.flags & LEFT)) {
|
| 1807 | while (--spec.field_width > 0) {
|
| 1808 | if (str < end)
|
| 1809 | *str = ' ';
|
| 1810 | ++str;
|
| 1811 | }
|
| 1812 | }
|
| 1813 | c = (unsigned char) get_arg(char);
|
| 1814 | if (str < end)
|
| 1815 | *str = c;
|
| 1816 | ++str;
|
| 1817 | while (--spec.field_width > 0) {
|
| 1818 | if (str < end)
|
| 1819 | *str = ' ';
|
| 1820 | ++str;
|
| 1821 | }
|
| 1822 | break;
|
| 1823 | }
|
| 1824 |
|
| 1825 | case FORMAT_TYPE_STR: {
|
| 1826 | const char *str_arg = args;
|
| 1827 | args += strlen(str_arg) + 1;
|
| 1828 | str = string(str, end, (char *)str_arg, spec);
|
| 1829 | break;
|
| 1830 | }
|
| 1831 |
|
| 1832 | case FORMAT_TYPE_PTR:
|
| 1833 | str = pointer(fmt+1, str, end, get_arg(void *), spec);
|
| 1834 | while (isalnum(*fmt))
|
| 1835 | fmt++;
|
| 1836 | break;
|
| 1837 |
|
| 1838 | case FORMAT_TYPE_PERCENT_CHAR:
|
| 1839 | case FORMAT_TYPE_INVALID:
|
| 1840 | if (str < end)
|
| 1841 | *str = '%';
|
| 1842 | ++str;
|
| 1843 | break;
|
| 1844 |
|
| 1845 | case FORMAT_TYPE_NRCHARS:
|
| 1846 |
|
| 1847 | break;
|
| 1848 |
|
| 1849 | default: {
|
| 1850 | unsigned long long num;
|
| 1851 |
|
| 1852 | switch (spec.type) {
|
| 1853 |
|
| 1854 | case FORMAT_TYPE_LONG_LONG:
|
| 1855 | num = get_arg(long long);
|
| 1856 | break;
|
| 1857 | case FORMAT_TYPE_ULONG:
|
| 1858 | case FORMAT_TYPE_LONG:
|
| 1859 | num = get_arg(unsigned long);
|
| 1860 | break;
|
| 1861 | case FORMAT_TYPE_SIZE_T:
|
| 1862 | num = get_arg(size_t);
|
| 1863 | break;
|
| 1864 | case FORMAT_TYPE_PTRDIFF:
|
| 1865 | num = get_arg(ptrdiff_t);
|
| 1866 | break;
|
| 1867 | case FORMAT_TYPE_UBYTE:
|
| 1868 | num = get_arg(unsigned char);
|
| 1869 | break;
|
| 1870 | case FORMAT_TYPE_BYTE:
|
| 1871 | num = get_arg(signed char);
|
| 1872 | break;
|
| 1873 | case FORMAT_TYPE_USHORT:
|
| 1874 | num = get_arg(unsigned short);
|
| 1875 | break;
|
| 1876 | case FORMAT_TYPE_SHORT:
|
| 1877 | num = get_arg(short);
|
| 1878 | break;
|
| 1879 | case FORMAT_TYPE_UINT:
|
| 1880 | num = get_arg(unsigned int);
|
| 1881 | break;
|
| 1882 | default:
|
| 1883 | num = get_arg(int);
|
| 1884 | }
|
| 1885 |
|
| 1886 | str = number(str, end, num, spec);
|
| 1887 | }
|
| 1888 | }
|
| 1889 | }
|
| 1890 |
|
| 1891 | if (size > 0) {
|
| 1892 | if (str < end)
|
| 1893 | *str = '\0';
|
| 1894 | else
|
| 1895 | end[-1] = '\0';
|
| 1896 | }
|
| 1897 |
|
| 1898 | #undef get_arg
|
| 1899 |
|
| 1900 |
|
| 1901 | return str - buf;
|
| 1902 | }
|
| 1903 | EXPORT_SYMBOL_GPL(bstr_printf);
|
| 1904 |
|
| 1905 | |
| 1906 | * bprintf - Parse a format string and place args' binary value in a buffer
|
| 1907 | * @bin_buf: The buffer to place args' binary value
|
| 1908 | * @size: The size of the buffer(by words(32bits), not characters)
|
| 1909 | * @fmt: The format string to use
|
| 1910 | * @...: Arguments for the format string
|
| 1911 | *
|
| 1912 | * The function returns the number of words(u32) written
|
| 1913 | * into @bin_buf.
|
| 1914 |
|
| 1915 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
|
| 1916 | {
|
| 1917 | va_list args;
|
| 1918 | int ret;
|
| 1919 |
|
| 1920 | va_start(args, fmt);
|
| 1921 | ret = vbin_printf(bin_buf, size, fmt, args);
|
| 1922 | va_end(args);
|
| 1923 |
|
| 1924 | return ret;
|
| 1925 | }
|
| 1926 | EXPORT_SYMBOL_GPL(bprintf);
|
| 1927 |
|
| 1928 | #endif
|
| 1929 |
|
| 1930 | |
| 1931 | * vsscanf - Unformat a buffer into a list of arguments
|
| 1932 | * @buf: input buffer
|
| 1933 | * @fmt: format of buffer
|
| 1934 | * @args: arguments
|
| 1935 |
|
| 1936 | int vsscanf(const char *buf, const char *fmt, va_list args)
|
| 1937 | {
|
| 1938 | const char *str = buf;
|
| 1939 | char *next;
|
| 1940 | char digit;
|
| 1941 | int num = 0;
|
| 1942 | u8 qualifier;
|
| 1943 | u8 base;
|
| 1944 | s16 field_width;
|
| 1945 | bool is_sign;
|
| 1946 |
|
| 1947 | while (*fmt && *str) {
|
| 1948 |
|
| 1949 | |
| 1950 | * white space, including none, in the input.
|
| 1951 |
|
| 1952 | if (isspace(*fmt)) {
|
| 1953 | fmt = skip_spaces(++fmt);
|
| 1954 | str = skip_spaces(str);
|
| 1955 | }
|
| 1956 |
|
| 1957 |
|
| 1958 | if (*fmt != '%' && *fmt) {
|
| 1959 | if (*fmt++ != *str++)
|
| 1960 | break;
|
| 1961 | continue;
|
| 1962 | }
|
| 1963 |
|
| 1964 | if (!*fmt)
|
| 1965 | break;
|
| 1966 | ++fmt;
|
| 1967 |
|
| 1968 | |
| 1969 | * advance both strings to next white space
|
| 1970 |
|
| 1971 | if (*fmt == '*') {
|
| 1972 | while (!isspace(*fmt) && *fmt != '%' && *fmt)
|
| 1973 | fmt++;
|
| 1974 | while (!isspace(*str) && *str)
|
| 1975 | str++;
|
| 1976 | continue;
|
| 1977 | }
|
| 1978 |
|
| 1979 |
|
| 1980 | field_width = -1;
|
| 1981 | if (isdigit(*fmt))
|
| 1982 | field_width = skip_atoi(&fmt);
|
| 1983 |
|
| 1984 |
|
| 1985 | qualifier = -1;
|
| 1986 | if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
|
| 1987 | _tolower(*fmt) == 'z') {
|
| 1988 | qualifier = *fmt++;
|
| 1989 | if (unlikely(qualifier == *fmt)) {
|
| 1990 | if (qualifier == 'h') {
|
| 1991 | qualifier = 'H';
|
| 1992 | fmt++;
|
| 1993 | } else if (qualifier == 'l') {
|
| 1994 | qualifier = 'L';
|
| 1995 | fmt++;
|
| 1996 | }
|
| 1997 | }
|
| 1998 | }
|
| 1999 |
|
| 2000 | if (!*fmt || !*str)
|
| 2001 | break;
|
| 2002 |
|
| 2003 | base = 10;
|
| 2004 | is_sign = 0;
|
| 2005 |
|
| 2006 | switch (*fmt++) {
|
| 2007 | case 'c':
|
| 2008 | {
|
| 2009 | char *s = (char *)va_arg(args, char*);
|
| 2010 | if (field_width == -1)
|
| 2011 | field_width = 1;
|
| 2012 | do {
|
| 2013 | *s++ = *str++;
|
| 2014 | } while (--field_width > 0 && *str);
|
| 2015 | num++;
|
| 2016 | }
|
| 2017 | continue;
|
| 2018 | case 's':
|
| 2019 | {
|
| 2020 | char *s = (char *)va_arg(args, char *);
|
| 2021 | if (field_width == -1)
|
| 2022 | field_width = SHRT_MAX;
|
| 2023 |
|
| 2024 | str = skip_spaces(str);
|
| 2025 |
|
| 2026 |
|
| 2027 | while (*str && !isspace(*str) && field_width--)
|
| 2028 | *s++ = *str++;
|
| 2029 | *s = '\0';
|
| 2030 | num++;
|
| 2031 | }
|
| 2032 | continue;
|
| 2033 | case 'n':
|
| 2034 |
|
| 2035 | {
|
| 2036 | int *i = (int *)va_arg(args, int*);
|
| 2037 | *i = str - buf;
|
| 2038 | }
|
| 2039 | continue;
|
| 2040 | case 'o':
|
| 2041 | base = 8;
|
| 2042 | break;
|
| 2043 | case 'x':
|
| 2044 | case 'X':
|
| 2045 | base = 16;
|
| 2046 | break;
|
| 2047 | case 'i':
|
| 2048 | base = 0;
|
| 2049 | case 'd':
|
| 2050 | is_sign = 1;
|
| 2051 | case 'u':
|
| 2052 | break;
|
| 2053 | case '%':
|
| 2054 |
|
| 2055 | if (*str++ != '%')
|
| 2056 | return num;
|
| 2057 | continue;
|
| 2058 | default:
|
| 2059 |
|
| 2060 | return num;
|
| 2061 | }
|
| 2062 |
|
| 2063 | |
| 2064 | * first, skip white space in buffer.
|
| 2065 |
|
| 2066 | str = skip_spaces(str);
|
| 2067 |
|
| 2068 | digit = *str;
|
| 2069 | if (is_sign && digit == '-')
|
| 2070 | digit = *(str + 1);
|
| 2071 |
|
| 2072 | if (!digit
|
| 2073 | || (base == 16 && !isxdigit(digit))
|
| 2074 | || (base == 10 && !isdigit(digit))
|
| 2075 | || (base == 8 && (!isdigit(digit) || digit > '7'))
|
| 2076 | || (base == 0 && !isdigit(digit)))
|
| 2077 | break;
|
| 2078 |
|
| 2079 | switch (qualifier) {
|
| 2080 | case 'H':
|
| 2081 | if (is_sign) {
|
| 2082 | signed char *s = (signed char *)va_arg(args, signed char *);
|
| 2083 | *s = (signed char)simple_strtol(str, &next, base);
|
| 2084 | } else {
|
| 2085 | unsigned char *s = (unsigned char *)va_arg(args, unsigned char *);
|
| 2086 | *s = (unsigned char)simple_strtoul(str, &next, base);
|
| 2087 | }
|
| 2088 | break;
|
| 2089 | case 'h':
|
| 2090 | if (is_sign) {
|
| 2091 | short *s = (short *)va_arg(args, short *);
|
| 2092 | *s = (short)simple_strtol(str, &next, base);
|
| 2093 | } else {
|
| 2094 | unsigned short *s = (unsigned short *)va_arg(args, unsigned short *);
|
| 2095 | *s = (unsigned short)simple_strtoul(str, &next, base);
|
| 2096 | }
|
| 2097 | break;
|
| 2098 | case 'l':
|
| 2099 | if (is_sign) {
|
| 2100 | long *l = (long *)va_arg(args, long *);
|
| 2101 | *l = simple_strtol(str, &next, base);
|
| 2102 | } else {
|
| 2103 | unsigned long *l = (unsigned long *)va_arg(args, unsigned long *);
|
| 2104 | *l = simple_strtoul(str, &next, base);
|
| 2105 | }
|
| 2106 | break;
|
| 2107 | case 'L':
|
| 2108 | if (is_sign) {
|
| 2109 | long long *l = (long long *)va_arg(args, long long *);
|
| 2110 | *l = simple_strtoll(str, &next, base);
|
| 2111 | } else {
|
| 2112 | unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *);
|
| 2113 | *l = simple_strtoull(str, &next, base);
|
| 2114 | }
|
| 2115 | break;
|
| 2116 | case 'Z':
|
| 2117 | case 'z':
|
| 2118 | {
|
| 2119 | size_t *s = (size_t *)va_arg(args, size_t *);
|
| 2120 | *s = (size_t)simple_strtoul(str, &next, base);
|
| 2121 | }
|
| 2122 | break;
|
| 2123 | default:
|
| 2124 | if (is_sign) {
|
| 2125 | int *i = (int *)va_arg(args, int *);
|
| 2126 | *i = (int)simple_strtol(str, &next, base);
|
| 2127 | } else {
|
| 2128 | unsigned int *i = (unsigned int *)va_arg(args, unsigned int*);
|
| 2129 | *i = (unsigned int)simple_strtoul(str, &next, base);
|
| 2130 | }
|
| 2131 | break;
|
| 2132 | }
|
| 2133 | num++;
|
| 2134 |
|
| 2135 | if (!next)
|
| 2136 | break;
|
| 2137 | str = next;
|
| 2138 | }
|
| 2139 |
|
| 2140 | |
| 2141 | * Now we've come all the way through so either the input string or the
|
| 2142 | * format ended. In the former case, there can be a %n at the current
|
| 2143 | * position in the format that needs to be filled.
|
| 2144 |
|
| 2145 | if (*fmt == '%' && *(fmt + 1) == 'n') {
|
| 2146 | int *p = (int *)va_arg(args, int *);
|
| 2147 | *p = str - buf;
|
| 2148 | }
|
| 2149 |
|
| 2150 | return num;
|
| 2151 | }
|
| 2152 | EXPORT_SYMBOL(vsscanf);
|
| 2153 |
|
| 2154 | |
| 2155 | * sscanf - Unformat a buffer into a list of arguments
|
| 2156 | * @buf: input buffer
|
| 2157 | * @fmt: formatting of buffer
|
| 2158 | * @...: resulting arguments
|
| 2159 |
|
| 2160 | int sscanf(const char *buf, const char *fmt, ...)
|
| 2161 | {
|
| 2162 | va_list args;
|
| 2163 | int i;
|
| 2164 |
|
| 2165 | va_start(args, fmt);
|
| 2166 | i = vsscanf(buf, fmt, args);
|
| 2167 | va_end(args);
|
| 2168 |
|
| 2169 | return i;
|
| 2170 | }
|
| 2171 | EXPORT_SYMBOL(sscanf);
|