| 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 |
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| 29 | #include <asm/page.h>
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| 30 | #include <asm/div64.h>
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| 31 | #include <asm/sections.h>
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| 32 |
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| 33 |
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| 34 | #define TOLOWER(x) ((x) | 0x20)
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| 35 |
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| 36 | static unsigned int simple_guess_base(const char *cp)
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| 37 | {
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| 38 | if (cp[0] == '0') {
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| 39 | if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
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| 40 | return 16;
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| 41 | else
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| 42 | return 8;
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| 43 | } else {
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| 44 | return 10;
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| 45 | }
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| 46 | }
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| 47 |
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| 48 | |
| 49 | * simple_strtoul - convert a string to an unsigned long
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| 50 | * @cp: The start of the string
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| 51 | * @endp: A pointer to the end of the parsed string will be placed here
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| 52 | * @base: The number base to use
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| 53 |
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| 54 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
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| 55 | {
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| 56 | unsigned long result = 0;
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| 57 |
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| 58 | if (!base)
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| 59 | base = simple_guess_base(cp);
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| 60 |
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| 61 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
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| 62 | cp += 2;
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| 63 |
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| 64 | while (isxdigit(*cp)) {
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| 65 | unsigned int value;
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| 66 |
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| 67 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
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| 68 | if (value >= base)
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| 69 | break;
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| 70 | result = result * base + value;
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| 71 | cp++;
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| 72 | }
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| 73 |
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| 74 | if (endp)
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| 75 | *endp = (char *)cp;
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| 76 | return result;
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| 77 | }
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| 78 | EXPORT_SYMBOL(simple_strtoul);
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| 79 |
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| 80 | |
| 81 | * simple_strtol - convert a string to a signed long
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| 82 | * @cp: The start of the string
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| 83 | * @endp: A pointer to the end of the parsed string will be placed here
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| 84 | * @base: The number base to use
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| 85 |
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| 86 | long simple_strtol(const char *cp, char **endp, unsigned int base)
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| 87 | {
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| 88 | if(*cp == '-')
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| 89 | return -simple_strtoul(cp + 1, endp, base);
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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_strtoull - convert a string to an unsigned 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 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
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| 101 | {
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| 102 | unsigned long long result = 0;
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| 103 |
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| 104 | if (!base)
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| 105 | base = simple_guess_base(cp);
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| 106 |
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| 107 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
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| 108 | cp += 2;
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| 109 |
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| 110 | while (isxdigit(*cp)) {
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| 111 | unsigned int value;
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| 112 |
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| 113 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
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| 114 | if (value >= base)
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| 115 | break;
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| 116 | result = result * base + value;
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| 117 | cp++;
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| 118 | }
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| 119 |
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| 120 | if (endp)
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| 121 | *endp = (char *)cp;
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| 122 | return result;
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| 123 | }
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| 124 | EXPORT_SYMBOL(simple_strtoull);
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| 125 |
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| 126 | |
| 127 | * simple_strtoll - convert a string to a signed long long
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| 128 | * @cp: The start of the string
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| 129 | * @endp: A pointer to the end of the parsed string will be placed here
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| 130 | * @base: The number base to use
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| 131 |
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| 132 | long long simple_strtoll(const char *cp, char **endp, unsigned int base)
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| 133 | {
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| 134 | if(*cp=='-')
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| 135 | return -simple_strtoull(cp + 1, endp, base);
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| 136 | return simple_strtoull(cp, endp, base);
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| 137 | }
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| 138 |
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| 139 | |
| 140 | * strict_strtoul - convert a string to an unsigned long strictly
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| 141 | * @cp: The string to be converted
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| 142 | * @base: The number base to use
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| 143 | * @res: The converted result value
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| 144 | *
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| 145 | * strict_strtoul converts a string to an unsigned long only if the
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| 146 | * string is really an unsigned long string, any string containing
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| 147 | * any invalid char at the tail will be rejected and -EINVAL is returned,
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| 148 | * only a newline char at the tail is acceptible because people generally
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| 149 | * change a module parameter in the following way:
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| 150 | *
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| 151 | * echo 1024 > /sys/module/e1000/parameters/copybreak
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| 152 | *
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| 153 | * echo will append a newline to the tail.
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| 154 | *
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| 155 | * It returns 0 if conversion is successful and *res is set to the converted
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| 156 | * value, otherwise it returns -EINVAL and *res is set to 0.
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| 157 | *
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| 158 | * simple_strtoul just ignores the successive invalid characters and
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| 159 | * return the converted value of prefix part of the string.
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| 160 |
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| 161 | int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
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| 162 | {
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| 163 | char *tail;
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| 164 | unsigned long val;
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| 165 | size_t len;
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| 166 |
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| 167 | *res = 0;
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| 168 | len = strlen(cp);
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| 169 | if (len == 0)
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| 170 | return -EINVAL;
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| 171 |
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| 172 | val = simple_strtoul(cp, &tail, base);
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| 173 | if ((*tail == '\0') ||
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| 174 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
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| 175 | *res = val;
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| 176 | return 0;
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| 177 | }
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| 178 |
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| 179 | return -EINVAL;
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| 180 | }
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| 181 | EXPORT_SYMBOL(strict_strtoul);
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| 182 |
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| 183 | |
| 184 | * strict_strtol - convert a string to a long strictly
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| 185 | * @cp: The string to be converted
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| 186 | * @base: The number base to use
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| 187 | * @res: The converted result value
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| 188 | *
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| 189 | * strict_strtol is similiar to strict_strtoul, but it allows the first
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| 190 | * character of a string is '-'.
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| 191 | *
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| 192 | * It returns 0 if conversion is successful and *res is set to the converted
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| 193 | * value, otherwise it returns -EINVAL and *res is set to 0.
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| 194 |
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| 195 | int strict_strtol(const char *cp, unsigned int base, long *res)
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| 196 | {
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| 197 | int ret;
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| 198 | if (*cp == '-') {
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| 199 | ret = strict_strtoul(cp + 1, base, (unsigned long *)res);
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| 200 | if (!ret)
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| 201 | *res = -(*res);
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| 202 | } else {
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| 203 | ret = strict_strtoul(cp, base, (unsigned long *)res);
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| 204 | }
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| 205 |
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| 206 | return ret;
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| 207 | }
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| 208 | EXPORT_SYMBOL(strict_strtol);
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| 209 |
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| 210 | |
| 211 | * strict_strtoull - convert a string to an unsigned long long strictly
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| 212 | * @cp: The string to be converted
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| 213 | * @base: The number base to use
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| 214 | * @res: The converted result value
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| 215 | *
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| 216 | * strict_strtoull converts a string to an unsigned long long only if the
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| 217 | * string is really an unsigned long long string, any string containing
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| 218 | * any invalid char at the tail will be rejected and -EINVAL is returned,
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| 219 | * only a newline char at the tail is acceptible because people generally
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| 220 | * change a module parameter in the following way:
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| 221 | *
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| 222 | * echo 1024 > /sys/module/e1000/parameters/copybreak
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| 223 | *
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| 224 | * echo will append a newline to the tail of the string.
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| 225 | *
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| 226 | * It returns 0 if conversion is successful and *res is set to the converted
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| 227 | * value, otherwise it returns -EINVAL and *res is set to 0.
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| 228 | *
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| 229 | * simple_strtoull just ignores the successive invalid characters and
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| 230 | * return the converted value of prefix part of the string.
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| 231 |
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| 232 | int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res)
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| 233 | {
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| 234 | char *tail;
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| 235 | unsigned long long val;
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| 236 | size_t len;
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| 237 |
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| 238 | *res = 0;
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| 239 | len = strlen(cp);
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| 240 | if (len == 0)
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| 241 | return -EINVAL;
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| 242 |
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| 243 | val = simple_strtoull(cp, &tail, base);
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| 244 | if ((*tail == '\0') ||
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| 245 | ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
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| 246 | *res = val;
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| 247 | return 0;
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| 248 | }
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| 249 |
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| 250 | return -EINVAL;
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| 251 | }
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| 252 | EXPORT_SYMBOL(strict_strtoull);
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| 253 |
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| 254 | |
| 255 | * strict_strtoll - convert a string to a long long strictly
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| 256 | * @cp: The string to be converted
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| 257 | * @base: The number base to use
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| 258 | * @res: The converted result value
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| 259 | *
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| 260 | * strict_strtoll is similiar to strict_strtoull, but it allows the first
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| 261 | * character of a string is '-'.
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| 262 | *
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| 263 | * It returns 0 if conversion is successful and *res is set to the converted
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| 264 | * value, otherwise it returns -EINVAL and *res is set to 0.
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| 265 |
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| 266 | int strict_strtoll(const char *cp, unsigned int base, long long *res)
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| 267 | {
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| 268 | int ret;
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| 269 | if (*cp == '-') {
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| 270 | ret = strict_strtoull(cp + 1, base, (unsigned long long *)res);
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| 271 | if (!ret)
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| 272 | *res = -(*res);
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| 273 | } else {
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| 274 | ret = strict_strtoull(cp, base, (unsigned long long *)res);
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| 275 | }
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| 276 |
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| 277 | return ret;
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| 278 | }
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| 279 | EXPORT_SYMBOL(strict_strtoll);
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| 280 |
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| 281 | static int skip_atoi(const char **s)
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| 282 | {
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| 283 | int i=0;
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| 284 |
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| 285 | while (isdigit(**s))
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| 286 | i = i*10 + *((*s)++) - '0';
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| 287 | return i;
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| 288 | }
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| 289 |
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| 290 | |
| 291 | * for /proc and /sys data. This directly impacts e.g. top performance
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| 292 | * with many processes running. We optimize it for speed
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| 293 | * using code from
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| 294 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
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| 295 | * (with permission from the author, Douglas W. Jones).
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| 296 |
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| 297 | |
| 298 | * Outputs from one to five digits depending on input.
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| 299 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code.
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| 300 | static char* put_dec_trunc(char *buf, unsigned q)
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| 301 | {
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| 302 | unsigned d3, d2, d1, d0;
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| 303 | d1 = (q>>4) & 0xf;
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| 304 | d2 = (q>>8) & 0xf;
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| 305 | d3 = (q>>12);
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| 306 |
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| 307 | d0 = 6*(d3 + d2 + d1) + (q & 0xf);
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| 308 | q = (d0 * 0xcd) >> 11;
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| 309 | d0 = d0 - 10*q;
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| 310 | *buf++ = d0 + '0';
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| 311 | d1 = q + 9*d3 + 5*d2 + d1;
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| 312 | if (d1 != 0) {
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| 313 | q = (d1 * 0xcd) >> 11;
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| 314 | d1 = d1 - 10*q;
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| 315 | *buf++ = d1 + '0';
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| 316 |
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| 317 | d2 = q + 2*d2;
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| 318 | if ((d2 != 0) || (d3 != 0)) {
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| 319 | q = (d2 * 0xd) >> 7;
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| 320 | d2 = d2 - 10*q;
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| 321 | *buf++ = d2 + '0';
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| 322 |
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| 323 | d3 = q + 4*d3;
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| 324 | if (d3 != 0) {
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| 325 | q = (d3 * 0xcd) >> 11;
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| 326 | d3 = d3 - 10*q;
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| 327 | *buf++ = d3 + '0';
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| 328 | if (q != 0)
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| 329 | *buf++ = q + '0';
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| 330 | }
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| 331 | }
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| 332 | }
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| 333 | return buf;
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| 334 | }
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| 335 |
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| 336 | static char* put_dec_full(char *buf, unsigned q)
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| 337 | {
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| 338 |
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| 339 |
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| 340 | unsigned d3, d2, d1, d0;
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| 341 | d1 = (q>>4) & 0xf;
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| 342 | d2 = (q>>8) & 0xf;
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| 343 | d3 = (q>>12);
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| 344 |
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| 345 |
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| 346 |
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| 347 | |
| 348 | |
| 349 | |
| 350 | |
| 351 | |
| 352 |
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| 353 | d0 = 6*(d3 + d2 + d1) + (q & 0xf);
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| 354 | q = (d0 * 0xcd) >> 11;
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| 355 | d0 = d0 - 10*q;
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| 356 | *buf++ = d0 + '0';
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| 357 | d1 = q + 9*d3 + 5*d2 + d1;
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| 358 | q = (d1 * 0xcd) >> 11;
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| 359 | d1 = d1 - 10*q;
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| 360 | *buf++ = d1 + '0';
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| 361 |
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| 362 | d2 = q + 2*d2;
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| 363 | q = (d2 * 0xd) >> 7;
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| 364 | d2 = d2 - 10*q;
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| 365 | *buf++ = d2 + '0';
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| 366 |
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| 367 | d3 = q + 4*d3;
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| 368 | q = (d3 * 0xcd) >> 11;
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| 369 |
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| 370 | d3 = d3 - 10*q;
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| 371 | *buf++ = d3 + '0';
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| 372 | *buf++ = q + '0';
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| 373 | return buf;
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| 374 | }
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| 375 |
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| 376 | static noinline char* put_dec(char *buf, unsigned long long num)
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| 377 | {
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| 378 | while (1) {
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| 379 | unsigned rem;
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| 380 | if (num < 100000)
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| 381 | return put_dec_trunc(buf, num);
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| 382 | rem = do_div(num, 100000);
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| 383 | buf = put_dec_full(buf, rem);
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| 384 | }
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| 385 | }
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| 386 |
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| 387 | #define ZEROPAD 1
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| 388 | #define SIGN 2
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| 389 | #define PLUS 4
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| 390 | #define SPACE 8
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| 391 | #define LEFT 16
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| 392 | #define SMALL 32
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| 393 | #define SPECIAL 64
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| 394 |
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| 395 | static char *number(char *buf, char *end, unsigned long long num, int base, int size, int precision, int type)
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| 396 | {
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| 397 |
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| 398 | static const char digits[16] = "0123456789ABCDEF";
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| 399 |
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| 400 | char tmp[66];
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| 401 | char sign;
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| 402 | char locase;
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| 403 | int need_pfx = ((type & SPECIAL) && base != 10);
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| 404 | int i;
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| 405 |
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| 406 | |
| 407 | * produces same digits or (maybe lowercased) letters
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| 408 | locase = (type & SMALL);
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| 409 | if (type & LEFT)
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| 410 | type &= ~ZEROPAD;
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| 411 | sign = 0;
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| 412 | if (type & SIGN) {
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| 413 | if ((signed long long) num < 0) {
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| 414 | sign = '-';
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| 415 | num = - (signed long long) num;
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| 416 | size--;
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| 417 | } else if (type & PLUS) {
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| 418 | sign = '+';
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| 419 | size--;
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| 420 | } else if (type & SPACE) {
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| 421 | sign = ' ';
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| 422 | size--;
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| 423 | }
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| 424 | }
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| 425 | if (need_pfx) {
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| 426 | size--;
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| 427 | if (base == 16)
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| 428 | size--;
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| 429 | }
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| 430 |
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| 431 |
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| 432 | i = 0;
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| 433 | if (num == 0)
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| 434 | tmp[i++] = '0';
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| 435 | |
| 436 | else do {
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| 437 | tmp[i++] = (digits[do_div(num,base)] | locase);
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| 438 | } while (num != 0);
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| 439 |
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| 440 | else if (base != 10) {
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| 441 | int mask = base - 1;
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| 442 | int shift = 3;
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| 443 | if (base == 16) shift = 4;
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| 444 | do {
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| 445 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
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| 446 | num >>= shift;
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| 447 | } while (num);
|
| 448 | } else {
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| 449 | i = put_dec(tmp, num) - tmp;
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| 450 | }
|
| 451 |
|
| 452 |
|
| 453 | if (i > precision)
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| 454 | precision = i;
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| 455 |
|
| 456 | size -= precision;
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| 457 | if (!(type & (ZEROPAD+LEFT))) {
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| 458 | while(--size >= 0) {
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| 459 | if (buf < end)
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| 460 | *buf = ' ';
|
| 461 | ++buf;
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| 462 | }
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| 463 | }
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| 464 |
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| 465 | if (sign) {
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| 466 | if (buf < end)
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| 467 | *buf = sign;
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| 468 | ++buf;
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| 469 | }
|
| 470 |
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| 471 | if (need_pfx) {
|
| 472 | if (buf < end)
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| 473 | *buf = '0';
|
| 474 | ++buf;
|
| 475 | if (base == 16) {
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| 476 | if (buf < end)
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| 477 | *buf = ('X' | locase);
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| 478 | ++buf;
|
| 479 | }
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| 480 | }
|
| 481 |
|
| 482 | if (!(type & LEFT)) {
|
| 483 | char c = (type & ZEROPAD) ? '0' : ' ';
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| 484 | while (--size >= 0) {
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| 485 | if (buf < end)
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| 486 | *buf = c;
|
| 487 | ++buf;
|
| 488 | }
|
| 489 | }
|
| 490 |
|
| 491 | while (i <= --precision) {
|
| 492 | if (buf < end)
|
| 493 | *buf = '0';
|
| 494 | ++buf;
|
| 495 | }
|
| 496 |
|
| 497 | while (--i >= 0) {
|
| 498 | if (buf < end)
|
| 499 | *buf = tmp[i];
|
| 500 | ++buf;
|
| 501 | }
|
| 502 |
|
| 503 | while (--size >= 0) {
|
| 504 | if (buf < end)
|
| 505 | *buf = ' ';
|
| 506 | ++buf;
|
| 507 | }
|
| 508 | return buf;
|
| 509 | }
|
| 510 |
|
| 511 | static char *string(char *buf, char *end, char *s, int field_width, int precision, int flags)
|
| 512 | {
|
| 513 | int len, i;
|
| 514 |
|
| 515 | if ((unsigned long)s < PAGE_SIZE)
|
| 516 | s = "<NULL>";
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| 517 |
|
| 518 | len = strnlen(s, precision);
|
| 519 |
|
| 520 | if (!(flags & LEFT)) {
|
| 521 | while (len < field_width--) {
|
| 522 | if (buf < end)
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| 523 | *buf = ' ';
|
| 524 | ++buf;
|
| 525 | }
|
| 526 | }
|
| 527 | for (i = 0; i < len; ++i) {
|
| 528 | if (buf < end)
|
| 529 | *buf = *s;
|
| 530 | ++buf; ++s;
|
| 531 | }
|
| 532 | while (len < field_width--) {
|
| 533 | if (buf < end)
|
| 534 | *buf = ' ';
|
| 535 | ++buf;
|
| 536 | }
|
| 537 | return buf;
|
| 538 | }
|
| 539 |
|
| 540 | static char *symbol_string(char *buf, char *end, void *ptr, int field_width, int precision, int flags)
|
| 541 | {
|
| 542 | unsigned long value = (unsigned long) ptr;
|
| 543 | #ifdef CONFIG_KALLSYMS
|
| 544 | char sym[KSYM_SYMBOL_LEN];
|
| 545 | sprint_symbol(sym, value);
|
| 546 | return string(buf, end, sym, field_width, precision, flags);
|
| 547 | #else
|
| 548 | field_width = 2*sizeof(void *);
|
| 549 | flags |= SPECIAL | SMALL | ZEROPAD;
|
| 550 | return number(buf, end, value, 16, field_width, precision, flags);
|
| 551 | #endif
|
| 552 | }
|
| 553 |
|
| 554 | static char *resource_string(char *buf, char *end, struct resource *res, int field_width, int precision, int flags)
|
| 555 | {
|
| 556 | #ifndef IO_RSRC_PRINTK_SIZE
|
| 557 | #define IO_RSRC_PRINTK_SIZE 4
|
| 558 | #endif
|
| 559 |
|
| 560 | #ifndef MEM_RSRC_PRINTK_SIZE
|
| 561 | #define MEM_RSRC_PRINTK_SIZE 8
|
| 562 | #endif
|
| 563 |
|
| 564 |
|
| 565 | char sym[4*sizeof(resource_size_t) + 8];
|
| 566 | char *p = sym, *pend = sym + sizeof(sym);
|
| 567 | int size = -1;
|
| 568 |
|
| 569 | if (res->flags & IORESOURCE_IO)
|
| 570 | size = IO_RSRC_PRINTK_SIZE;
|
| 571 | else if (res->flags & IORESOURCE_MEM)
|
| 572 | size = MEM_RSRC_PRINTK_SIZE;
|
| 573 |
|
| 574 | *p++ = '[';
|
| 575 | p = number(p, pend, res->start, 16, size, -1, SPECIAL | SMALL | ZEROPAD);
|
| 576 | *p++ = '-';
|
| 577 | p = number(p, pend, res->end, 16, size, -1, SPECIAL | SMALL | ZEROPAD);
|
| 578 | *p++ = ']';
|
| 579 | *p = 0;
|
| 580 |
|
| 581 | return string(buf, end, sym, field_width, precision, flags);
|
| 582 | }
|
| 583 |
|
| 584 | |
| 585 | * Show a '%p' thing. A kernel extension is that the '%p' is followed
|
| 586 | * by an extra set of alphanumeric characters that are extended format
|
| 587 | * specifiers.
|
| 588 | *
|
| 589 | * Right now we handle:
|
| 590 | *
|
| 591 | * - 'F' For symbolic function descriptor pointers
|
| 592 | * - 'S' For symbolic direct pointers
|
| 593 | * - 'R' For a struct resource pointer, it prints the range of
|
| 594 | * addresses (not the name nor the flags)
|
| 595 | *
|
| 596 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
|
| 597 | * function pointers are really function descriptors, which contain a
|
| 598 | * pointer to the real address.
|
| 599 |
|
| 600 | static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field_width, int precision, int flags)
|
| 601 | {
|
| 602 | switch (*fmt) {
|
| 603 | case 'F':
|
| 604 | ptr = dereference_function_descriptor(ptr);
|
| 605 |
|
| 606 | case 'S':
|
| 607 | return symbol_string(buf, end, ptr, field_width, precision, flags);
|
| 608 | case 'R':
|
| 609 | return resource_string(buf, end, ptr, field_width, precision, flags);
|
| 610 | }
|
| 611 | flags |= SMALL;
|
| 612 | if (field_width == -1) {
|
| 613 | field_width = 2*sizeof(void *);
|
| 614 | flags |= ZEROPAD;
|
| 615 | }
|
| 616 | return number(buf, end, (unsigned long) ptr, 16, field_width, precision, flags);
|
| 617 | }
|
| 618 |
|
| 619 | |
| 620 | * vsnprintf - Format a string and place it in a buffer
|
| 621 | * @buf: The buffer to place the result into
|
| 622 | * @size: The size of the buffer, including the trailing null space
|
| 623 | * @fmt: The format string to use
|
| 624 | * @args: Arguments for the format string
|
| 625 | *
|
| 626 | * This function follows C99 vsnprintf, but has some extensions:
|
| 627 | * %pS output the name of a text symbol
|
| 628 | * %pF output the name of a function pointer
|
| 629 | * %pR output the address range in a struct resource
|
| 630 | *
|
| 631 | * The return value is the number of characters which would
|
| 632 | * be generated for the given input, excluding the trailing
|
| 633 | * '\0', as per ISO C99. If you want to have the exact
|
| 634 | * number of characters written into @buf as return value
|
| 635 | * (not including the trailing '\0'), use vscnprintf(). If the
|
| 636 | * return is greater than or equal to @size, the resulting
|
| 637 | * string is truncated.
|
| 638 | *
|
| 639 | * Call this function if you are already dealing with a va_list.
|
| 640 | * You probably want snprintf() instead.
|
| 641 |
|
| 642 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
|
| 643 | {
|
| 644 | unsigned long long num;
|
| 645 | int base;
|
| 646 | char *str, *end, c;
|
| 647 |
|
| 648 | int flags;
|
| 649 |
|
| 650 | int field_width;
|
| 651 | int precision; |
| 652 | number of chars for from string
|
| 653 | int qualifier;
|
| 654 |
|
| 655 |
|
| 656 |
|
| 657 |
|
| 658 | |
| 659 | used for unknown buffer sizes.
|
| 660 | if (unlikely((int) size < 0)) {
|
| 661 |
|
| 662 | static char warn = 1;
|
| 663 | WARN_ON(warn);
|
| 664 | warn = 0;
|
| 665 | return 0;
|
| 666 | }
|
| 667 |
|
| 668 | str = buf;
|
| 669 | end = buf + size;
|
| 670 |
|
| 671 |
|
| 672 | if (end < buf) {
|
| 673 | end = ((void *)-1);
|
| 674 | size = end - buf;
|
| 675 | }
|
| 676 |
|
| 677 | for (; *fmt ; ++fmt) {
|
| 678 | if (*fmt != '%') {
|
| 679 | if (str < end)
|
| 680 | *str = *fmt;
|
| 681 | ++str;
|
| 682 | continue;
|
| 683 | }
|
| 684 |
|
| 685 |
|
| 686 | flags = 0;
|
| 687 | repeat:
|
| 688 | ++fmt;
|
| 689 | switch (*fmt) {
|
| 690 | case '-': flags |= LEFT; goto repeat;
|
| 691 | case '+': flags |= PLUS; goto repeat;
|
| 692 | case ' ': flags |= SPACE; goto repeat;
|
| 693 | case '#': flags |= SPECIAL; goto repeat;
|
| 694 | case '0': flags |= ZEROPAD; goto repeat;
|
| 695 | }
|
| 696 |
|
| 697 |
|
| 698 | field_width = -1;
|
| 699 | if (isdigit(*fmt))
|
| 700 | field_width = skip_atoi(&fmt);
|
| 701 | else if (*fmt == '*') {
|
| 702 | ++fmt;
|
| 703 |
|
| 704 | field_width = va_arg(args, int);
|
| 705 | if (field_width < 0) {
|
| 706 | field_width = -field_width;
|
| 707 | flags |= LEFT;
|
| 708 | }
|
| 709 | }
|
| 710 |
|
| 711 |
|
| 712 | precision = -1;
|
| 713 | if (*fmt == '.') {
|
| 714 | ++fmt;
|
| 715 | if (isdigit(*fmt))
|
| 716 | precision = skip_atoi(&fmt);
|
| 717 | else if (*fmt == '*') {
|
| 718 | ++fmt;
|
| 719 |
|
| 720 | precision = va_arg(args, int);
|
| 721 | }
|
| 722 | if (precision < 0)
|
| 723 | precision = 0;
|
| 724 | }
|
| 725 |
|
| 726 |
|
| 727 | qualifier = -1;
|
| 728 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
|
| 729 | *fmt =='Z' || *fmt == 'z' || *fmt == 't') {
|
| 730 | qualifier = *fmt;
|
| 731 | ++fmt;
|
| 732 | if (qualifier == 'l' && *fmt == 'l') {
|
| 733 | qualifier = 'L';
|
| 734 | ++fmt;
|
| 735 | }
|
| 736 | }
|
| 737 |
|
| 738 |
|
| 739 | base = 10;
|
| 740 |
|
| 741 | switch (*fmt) {
|
| 742 | case 'c':
|
| 743 | if (!(flags & LEFT)) {
|
| 744 | while (--field_width > 0) {
|
| 745 | if (str < end)
|
| 746 | *str = ' ';
|
| 747 | ++str;
|
| 748 | }
|
| 749 | }
|
| 750 | c = (unsigned char) va_arg(args, int);
|
| 751 | if (str < end)
|
| 752 | *str = c;
|
| 753 | ++str;
|
| 754 | while (--field_width > 0) {
|
| 755 | if (str < end)
|
| 756 | *str = ' ';
|
| 757 | ++str;
|
| 758 | }
|
| 759 | continue;
|
| 760 |
|
| 761 | case 's':
|
| 762 | str = string(str, end, va_arg(args, char *), field_width, precision, flags);
|
| 763 | continue;
|
| 764 |
|
| 765 | case 'p':
|
| 766 | str = pointer(fmt+1, str, end,
|
| 767 | va_arg(args, void *),
|
| 768 | field_width, precision, flags);
|
| 769 |
|
| 770 | while (isalnum(fmt[1]))
|
| 771 | fmt++;
|
| 772 | continue;
|
| 773 |
|
| 774 | case 'n':
|
| 775 | |
| 776 | * What does C99 say about the overflow case here?
|
| 777 | if (qualifier == 'l') {
|
| 778 | long * ip = va_arg(args, long *);
|
| 779 | *ip = (str - buf);
|
| 780 | } else if (qualifier == 'Z' || qualifier == 'z') {
|
| 781 | size_t * ip = va_arg(args, size_t *);
|
| 782 | *ip = (str - buf);
|
| 783 | } else {
|
| 784 | int * ip = va_arg(args, int *);
|
| 785 | *ip = (str - buf);
|
| 786 | }
|
| 787 | continue;
|
| 788 |
|
| 789 | case '%':
|
| 790 | if (str < end)
|
| 791 | *str = '%';
|
| 792 | ++str;
|
| 793 | continue;
|
| 794 |
|
| 795 |
|
| 796 | case 'o':
|
| 797 | base = 8;
|
| 798 | break;
|
| 799 |
|
| 800 | case 'x':
|
| 801 | flags |= SMALL;
|
| 802 | case 'X':
|
| 803 | base = 16;
|
| 804 | break;
|
| 805 |
|
| 806 | case 'd':
|
| 807 | case 'i':
|
| 808 | flags |= SIGN;
|
| 809 | case 'u':
|
| 810 | break;
|
| 811 |
|
| 812 | default:
|
| 813 | if (str < end)
|
| 814 | *str = '%';
|
| 815 | ++str;
|
| 816 | if (*fmt) {
|
| 817 | if (str < end)
|
| 818 | *str = *fmt;
|
| 819 | ++str;
|
| 820 | } else {
|
| 821 | --fmt;
|
| 822 | }
|
| 823 | continue;
|
| 824 | }
|
| 825 | if (qualifier == 'L')
|
| 826 | num = va_arg(args, long long);
|
| 827 | else if (qualifier == 'l') {
|
| 828 | num = va_arg(args, unsigned long);
|
| 829 | if (flags & SIGN)
|
| 830 | num = (signed long) num;
|
| 831 | } else if (qualifier == 'Z' || qualifier == 'z') {
|
| 832 | num = va_arg(args, size_t);
|
| 833 | } else if (qualifier == 't') {
|
| 834 | num = va_arg(args, ptrdiff_t);
|
| 835 | } else if (qualifier == 'h') {
|
| 836 | num = (unsigned short) va_arg(args, int);
|
| 837 | if (flags & SIGN)
|
| 838 | num = (signed short) num;
|
| 839 | } else {
|
| 840 | num = va_arg(args, unsigned int);
|
| 841 | if (flags & SIGN)
|
| 842 | num = (signed int) num;
|
| 843 | }
|
| 844 | str = number(str, end, num, base,
|
| 845 | field_width, precision, flags);
|
| 846 | }
|
| 847 | if (size > 0) {
|
| 848 | if (str < end)
|
| 849 | *str = '\0';
|
| 850 | else
|
| 851 | end[-1] = '\0';
|
| 852 | }
|
| 853 |
|
| 854 | return str-buf;
|
| 855 | }
|
| 856 | EXPORT_SYMBOL(vsnprintf);
|
| 857 |
|
| 858 | |
| 859 | * vscnprintf - Format a string and place it in a buffer
|
| 860 | * @buf: The buffer to place the result into
|
| 861 | * @size: The size of the buffer, including the trailing null space
|
| 862 | * @fmt: The format string to use
|
| 863 | * @args: Arguments for the format string
|
| 864 | *
|
| 865 | * The return value is the number of characters which have been written into
|
| 866 | * the @buf not including the trailing '\0'. If @size is <= 0 the function
|
| 867 | * returns 0.
|
| 868 | *
|
| 869 | * Call this function if you are already dealing with a va_list.
|
| 870 | * You probably want scnprintf() instead.
|
| 871 | *
|
| 872 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 873 |
|
| 874 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
|
| 875 | {
|
| 876 | int i;
|
| 877 |
|
| 878 | i=vsnprintf(buf,size,fmt,args);
|
| 879 | return (i >= size) ? (size - 1) : i;
|
| 880 | }
|
| 881 | EXPORT_SYMBOL(vscnprintf);
|
| 882 |
|
| 883 | |
| 884 | * snprintf - Format a string and place it in a buffer
|
| 885 | * @buf: The buffer to place the result into
|
| 886 | * @size: The size of the buffer, including the trailing null space
|
| 887 | * @fmt: The format string to use
|
| 888 | * @...: Arguments for the format string
|
| 889 | *
|
| 890 | * The return value is the number of characters which would be
|
| 891 | * generated for the given input, excluding the trailing null,
|
| 892 | * as per ISO C99. If the return is greater than or equal to
|
| 893 | * @size, the resulting string is truncated.
|
| 894 | *
|
| 895 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 896 |
|
| 897 | int snprintf(char * buf, size_t size, const char *fmt, ...)
|
| 898 | {
|
| 899 | va_list args;
|
| 900 | int i;
|
| 901 |
|
| 902 | va_start(args, fmt);
|
| 903 | i=vsnprintf(buf,size,fmt,args);
|
| 904 | va_end(args);
|
| 905 | return i;
|
| 906 | }
|
| 907 | EXPORT_SYMBOL(snprintf);
|
| 908 |
|
| 909 | |
| 910 | * scnprintf - Format a string and place it in a buffer
|
| 911 | * @buf: The buffer to place the result into
|
| 912 | * @size: The size of the buffer, including the trailing null space
|
| 913 | * @fmt: The format string to use
|
| 914 | * @...: Arguments for the format string
|
| 915 | *
|
| 916 | * The return value is the number of characters written into @buf not including
|
| 917 | * the trailing '\0'. If @size is <= 0 the function returns 0.
|
| 918 |
|
| 919 |
|
| 920 | int scnprintf(char * buf, size_t size, const char *fmt, ...)
|
| 921 | {
|
| 922 | va_list args;
|
| 923 | int i;
|
| 924 |
|
| 925 | va_start(args, fmt);
|
| 926 | i = vsnprintf(buf, size, fmt, args);
|
| 927 | va_end(args);
|
| 928 | return (i >= size) ? (size - 1) : i;
|
| 929 | }
|
| 930 | EXPORT_SYMBOL(scnprintf);
|
| 931 |
|
| 932 | |
| 933 | * vsprintf - Format a string and place it in a buffer
|
| 934 | * @buf: The buffer to place the result into
|
| 935 | * @fmt: The format string to use
|
| 936 | * @args: Arguments for the format string
|
| 937 | *
|
| 938 | * The function returns the number of characters written
|
| 939 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
|
| 940 | * buffer overflows.
|
| 941 | *
|
| 942 | * Call this function if you are already dealing with a va_list.
|
| 943 | * You probably want sprintf() instead.
|
| 944 | *
|
| 945 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 946 |
|
| 947 | int vsprintf(char *buf, const char *fmt, va_list args)
|
| 948 | {
|
| 949 | return vsnprintf(buf, INT_MAX, fmt, args);
|
| 950 | }
|
| 951 | EXPORT_SYMBOL(vsprintf);
|
| 952 |
|
| 953 | |
| 954 | * sprintf - Format a string and place it in a buffer
|
| 955 | * @buf: The buffer to place the result into
|
| 956 | * @fmt: The format string to use
|
| 957 | * @...: Arguments for the format string
|
| 958 | *
|
| 959 | * The function returns the number of characters written
|
| 960 | * into @buf. Use snprintf() or scnprintf() in order to avoid
|
| 961 | * buffer overflows.
|
| 962 | *
|
| 963 | * See the vsnprintf() documentation for format string extensions over C99.
|
| 964 |
|
| 965 | int sprintf(char * buf, const char *fmt, ...)
|
| 966 | {
|
| 967 | va_list args;
|
| 968 | int i;
|
| 969 |
|
| 970 | va_start(args, fmt);
|
| 971 | i=vsnprintf(buf, INT_MAX, fmt, args);
|
| 972 | va_end(args);
|
| 973 | return i;
|
| 974 | }
|
| 975 | EXPORT_SYMBOL(sprintf);
|
| 976 |
|
| 977 | |
| 978 | * vsscanf - Unformat a buffer into a list of arguments
|
| 979 | * @buf: input buffer
|
| 980 | * @fmt: format of buffer
|
| 981 | * @args: arguments
|
| 982 |
|
| 983 | int vsscanf(const char * buf, const char * fmt, va_list args)
|
| 984 | {
|
| 985 | const char *str = buf;
|
| 986 | char *next;
|
| 987 | char digit;
|
| 988 | int num = 0;
|
| 989 | int qualifier;
|
| 990 | int base;
|
| 991 | int field_width;
|
| 992 | int is_sign = 0;
|
| 993 |
|
| 994 | while(*fmt && *str) {
|
| 995 |
|
| 996 | |
| 997 | * white space, including none, in the input.
|
| 998 |
|
| 999 | if (isspace(*fmt)) {
|
| 1000 | while (isspace(*fmt))
|
| 1001 | ++fmt;
|
| 1002 | while (isspace(*str))
|
| 1003 | ++str;
|
| 1004 | }
|
| 1005 |
|
| 1006 |
|
| 1007 | if (*fmt != '%' && *fmt) {
|
| 1008 | if (*fmt++ != *str++)
|
| 1009 | break;
|
| 1010 | continue;
|
| 1011 | }
|
| 1012 |
|
| 1013 | if (!*fmt)
|
| 1014 | break;
|
| 1015 | ++fmt;
|
| 1016 |
|
| 1017 | |
| 1018 | * advance both strings to next white space
|
| 1019 |
|
| 1020 | if (*fmt == '*') {
|
| 1021 | while (!isspace(*fmt) && *fmt)
|
| 1022 | fmt++;
|
| 1023 | while (!isspace(*str) && *str)
|
| 1024 | str++;
|
| 1025 | continue;
|
| 1026 | }
|
| 1027 |
|
| 1028 |
|
| 1029 | field_width = -1;
|
| 1030 | if (isdigit(*fmt))
|
| 1031 | field_width = skip_atoi(&fmt);
|
| 1032 |
|
| 1033 |
|
| 1034 | qualifier = -1;
|
| 1035 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
|
| 1036 | *fmt == 'Z' || *fmt == 'z') {
|
| 1037 | qualifier = *fmt++;
|
| 1038 | if (unlikely(qualifier == *fmt)) {
|
| 1039 | if (qualifier == 'h') {
|
| 1040 | qualifier = 'H';
|
| 1041 | fmt++;
|
| 1042 | } else if (qualifier == 'l') {
|
| 1043 | qualifier = 'L';
|
| 1044 | fmt++;
|
| 1045 | }
|
| 1046 | }
|
| 1047 | }
|
| 1048 | base = 10;
|
| 1049 | is_sign = 0;
|
| 1050 |
|
| 1051 | if (!*fmt || !*str)
|
| 1052 | break;
|
| 1053 |
|
| 1054 | switch(*fmt++) {
|
| 1055 | case 'c':
|
| 1056 | {
|
| 1057 | char *s = (char *) va_arg(args,char*);
|
| 1058 | if (field_width == -1)
|
| 1059 | field_width = 1;
|
| 1060 | do {
|
| 1061 | *s++ = *str++;
|
| 1062 | } while (--field_width > 0 && *str);
|
| 1063 | num++;
|
| 1064 | }
|
| 1065 | continue;
|
| 1066 | case 's':
|
| 1067 | {
|
| 1068 | char *s = (char *) va_arg(args, char *);
|
| 1069 | if(field_width == -1)
|
| 1070 | field_width = INT_MAX;
|
| 1071 |
|
| 1072 | while (isspace(*str))
|
| 1073 | str++;
|
| 1074 |
|
| 1075 |
|
| 1076 | while (*str && !isspace(*str) && field_width--) {
|
| 1077 | *s++ = *str++;
|
| 1078 | }
|
| 1079 | *s = '\0';
|
| 1080 | num++;
|
| 1081 | }
|
| 1082 | continue;
|
| 1083 | case 'n':
|
| 1084 |
|
| 1085 | {
|
| 1086 | int *i = (int *)va_arg(args,int*);
|
| 1087 | *i = str - buf;
|
| 1088 | }
|
| 1089 | continue;
|
| 1090 | case 'o':
|
| 1091 | base = 8;
|
| 1092 | break;
|
| 1093 | case 'x':
|
| 1094 | case 'X':
|
| 1095 | base = 16;
|
| 1096 | break;
|
| 1097 | case 'i':
|
| 1098 | base = 0;
|
| 1099 | case 'd':
|
| 1100 | is_sign = 1;
|
| 1101 | case 'u':
|
| 1102 | break;
|
| 1103 | case '%':
|
| 1104 |
|
| 1105 | if (*str++ != '%')
|
| 1106 | return num;
|
| 1107 | continue;
|
| 1108 | default:
|
| 1109 |
|
| 1110 | return num;
|
| 1111 | }
|
| 1112 |
|
| 1113 | |
| 1114 | * first, skip white space in buffer.
|
| 1115 |
|
| 1116 | while (isspace(*str))
|
| 1117 | str++;
|
| 1118 |
|
| 1119 | digit = *str;
|
| 1120 | if (is_sign && digit == '-')
|
| 1121 | digit = *(str + 1);
|
| 1122 |
|
| 1123 | if (!digit
|
| 1124 | || (base == 16 && !isxdigit(digit))
|
| 1125 | || (base == 10 && !isdigit(digit))
|
| 1126 | || (base == 8 && (!isdigit(digit) || digit > '7'))
|
| 1127 | || (base == 0 && !isdigit(digit)))
|
| 1128 | break;
|
| 1129 |
|
| 1130 | switch(qualifier) {
|
| 1131 | case 'H':
|
| 1132 | if (is_sign) {
|
| 1133 | signed char *s = (signed char *) va_arg(args,signed char *);
|
| 1134 | *s = (signed char) simple_strtol(str,&next,base);
|
| 1135 | } else {
|
| 1136 | unsigned char *s = (unsigned char *) va_arg(args, unsigned char *);
|
| 1137 | *s = (unsigned char) simple_strtoul(str, &next, base);
|
| 1138 | }
|
| 1139 | break;
|
| 1140 | case 'h':
|
| 1141 | if (is_sign) {
|
| 1142 | short *s = (short *) va_arg(args,short *);
|
| 1143 | *s = (short) simple_strtol(str,&next,base);
|
| 1144 | } else {
|
| 1145 | unsigned short *s = (unsigned short *) va_arg(args, unsigned short *);
|
| 1146 | *s = (unsigned short) simple_strtoul(str, &next, base);
|
| 1147 | }
|
| 1148 | break;
|
| 1149 | case 'l':
|
| 1150 | if (is_sign) {
|
| 1151 | long *l = (long *) va_arg(args,long *);
|
| 1152 | *l = simple_strtol(str,&next,base);
|
| 1153 | } else {
|
| 1154 | unsigned long *l = (unsigned long*) va_arg(args,unsigned long*);
|
| 1155 | *l = simple_strtoul(str,&next,base);
|
| 1156 | }
|
| 1157 | break;
|
| 1158 | case 'L':
|
| 1159 | if (is_sign) {
|
| 1160 | long long *l = (long long*) va_arg(args,long long *);
|
| 1161 | *l = simple_strtoll(str,&next,base);
|
| 1162 | } else {
|
| 1163 | unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*);
|
| 1164 | *l = simple_strtoull(str,&next,base);
|
| 1165 | }
|
| 1166 | break;
|
| 1167 | case 'Z':
|
| 1168 | case 'z':
|
| 1169 | {
|
| 1170 | size_t *s = (size_t*) va_arg(args,size_t*);
|
| 1171 | *s = (size_t) simple_strtoul(str,&next,base);
|
| 1172 | }
|
| 1173 | break;
|
| 1174 | default:
|
| 1175 | if (is_sign) {
|
| 1176 | int *i = (int *) va_arg(args, int*);
|
| 1177 | *i = (int) simple_strtol(str,&next,base);
|
| 1178 | } else {
|
| 1179 | unsigned int *i = (unsigned int*) va_arg(args, unsigned int*);
|
| 1180 | *i = (unsigned int) simple_strtoul(str,&next,base);
|
| 1181 | }
|
| 1182 | break;
|
| 1183 | }
|
| 1184 | num++;
|
| 1185 |
|
| 1186 | if (!next)
|
| 1187 | break;
|
| 1188 | str = next;
|
| 1189 | }
|
| 1190 |
|
| 1191 | |
| 1192 | * Now we've come all the way through so either the input string or the
|
| 1193 | * format ended. In the former case, there can be a %n at the current
|
| 1194 | * position in the format that needs to be filled.
|
| 1195 |
|
| 1196 | if (*fmt == '%' && *(fmt + 1) == 'n') {
|
| 1197 | int *p = (int *)va_arg(args, int *);
|
| 1198 | *p = str - buf;
|
| 1199 | }
|
| 1200 |
|
| 1201 | return num;
|
| 1202 | }
|
| 1203 | EXPORT_SYMBOL(vsscanf);
|
| 1204 |
|
| 1205 | |
| 1206 | * sscanf - Unformat a buffer into a list of arguments
|
| 1207 | * @buf: input buffer
|
| 1208 | * @fmt: formatting of buffer
|
| 1209 | * @...: resulting arguments
|
| 1210 |
|
| 1211 | int sscanf(const char * buf, const char * fmt, ...)
|
| 1212 | {
|
| 1213 | va_list args;
|
| 1214 | int i;
|
| 1215 |
|
| 1216 | va_start(args,fmt);
|
| 1217 | i = vsscanf(buf,fmt,args);
|
| 1218 | va_end(args);
|
| 1219 | return i;
|
| 1220 | }
|
| 1221 | EXPORT_SYMBOL(sscanf);
|