lib/strto.c

   1 /*
   2  *  linux/lib/vsprintf.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
   8 /*
   9  * Wirzenius wrote this portably, Torvalds fucked it up :-)
  10  */
  11
  12 #include <common.h>
  13 #include <errno.h>
  14 #include <linux/ctype.h>
  15
  16 unsigned long simple_strtoul(const char *cp, char **endp,
  17                                 unsigned int base)
  18 {
  19         unsigned long result = 0;
  20         unsigned long value;
  21
  22         if (*cp == '0') {
  23                 cp++;
  24                 if ((*cp == 'x') && isxdigit(cp[1])) {
  25                         base = 16;
  26                         cp++;
  27                 }
  28
  29                 if (!base)
  30                         base = 8;
  31         }
  32
  33         if (!base)
  34                 base = 10;
  35
  36         while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
  37             ? toupper(*cp) : *cp)-'A'+10) < base) {
  38                 result = result*base + value;
  39                 cp++;
  40         }
  41
  42         if (endp)
  43                 *endp = (char *)cp;
  44
  45         return result;
  46 }
  47
  48 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
  49 {
  50         char *tail;
  51         unsigned long val;
  52         size_t len;
  53
  54         *res = 0;
  55         len = strlen(cp);
  56         if (len == 0)
  57                 return -EINVAL;
  58
  59         val = simple_strtoul(cp, &tail, base);
  60         if (tail == cp)
  61                 return -EINVAL;
  62
  63         if ((*tail == '\0') ||
  64                 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
  65                 *res = val;
  66                 return 0;
  67         }
  68
  69         return -EINVAL;
  70 }
  71
  72 long simple_strtol(const char *cp, char **endp, unsigned int base)
  73 {
  74         if (*cp == '-')
  75                 return -simple_strtoul(cp + 1, endp, base);
  76
  77         return simple_strtoul(cp, endp, base);
  78 }
  79
  80 unsigned long ustrtoul(const char *cp, char **endp, unsigned int base)
  81 {
  82         unsigned long result = simple_strtoul(cp, endp, base);
  83         switch (**endp) {
  84         case 'G':
  85                 result *= 1024;
  86                 /* fall through */
  87         case 'M':
  88                 result *= 1024;
  89                 /* fall through */
  90         case 'K':
  91         case 'k':
  92                 result *= 1024;
  93                 if ((*endp)[1] == 'i') {
  94                         if ((*endp)[2] == 'B')
  95                                 (*endp) += 3;
  96                         else
  97                                 (*endp) += 2;
  98                 }
  99         }
 100         return result;
 101 }
 102
 103 unsigned long long ustrtoull(const char *cp, char **endp, unsigned int base)
 104 {
 105         unsigned long long result = simple_strtoull(cp, endp, base);
 106         switch (**endp) {
 107         case 'G':
 108                 result *= 1024;
 109                 /* fall through */
 110         case 'M':
 111                 result *= 1024;
 112                 /* fall through */
 113         case 'K':
 114         case 'k':
 115                 result *= 1024;
 116                 if ((*endp)[1] == 'i') {
 117                         if ((*endp)[2] == 'B')
 118                                 (*endp) += 3;
 119                         else
 120                                 (*endp) += 2;
 121                 }
 122         }
 123         return result;
 124 }
 125
 126 unsigned long long simple_strtoull(const char *cp, char **endp,
 127                                         unsigned int base)
 128 {
 129         unsigned long long result = 0, value;
 130
 131         if (*cp == '0') {
 132                 cp++;
 133                 if ((*cp == 'x') && isxdigit(cp[1])) {
 134                         base = 16;
 135                         cp++;
 136                 }
 137
 138                 if (!base)
 139                         base = 8;
 140         }
 141
 142         if (!base)
 143                 base = 10;
 144
 145         while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp - '0'
 146                 : (islower(*cp) ? toupper(*cp) : *cp) - 'A' + 10) < base) {
 147                 result = result * base + value;
 148                 cp++;
 149         }
 150
 151         if (endp)
 152                 *endp = (char *) cp;
 153
 154         return result;
 155 }
 156
 157 long trailing_strtoln(const char *str, const char *end)
 158 {
 159         const char *p;
 160
 161         if (!end)
 162                 end = str + strlen(str);
 163         for (p = end - 1; p > str; p--) {
 164                 if (!isdigit(*p))
 165                         return simple_strtoul(p + 1, NULL, 10);
 166         }
 167
 168         return -1;
 169 }
 170
 171 long trailing_strtol(const char *str)
 172 {
 173         return trailing_strtoln(str, NULL);
 174 }