release/src/router/busybox/libbb/xatonum_template.c

   1 /*
   2  *
   3  * Licensed under GPLv2, see file LICENSE in this tarball for details.
   4  */
   5 /*
   6 You need to define the following (example):
   7
   8 #define type long
   9 #define xstrtou(rest) xstrtoul##rest
  10 #define xstrto(rest) xstrtol##rest
  11 #define xatou(rest) xatoul##rest
  12 #define xato(rest) xatol##rest
  13 #define XSTR_UTYPE_MAX ULONG_MAX
  14 #define XSTR_TYPE_MAX LONG_MAX
  15 #define XSTR_TYPE_MIN LONG_MIN
  16 #define XSTR_STRTOU strtoul
  17 */
  18
  19 unsigned type FAST_FUNC xstrtou(_range_sfx)(const char *numstr, int base,
  20                 unsigned type lower,
  21                 unsigned type upper,
  22                 const struct suffix_mult *suffixes)
  23 {
  24         unsigned type r;
  25         int old_errno;
  26         char *e;
  27
  28         /* Disallow '-' and any leading whitespace. Make sure we get the
  29          * actual isspace function rather than a macro implementaion. */
  30         if (*numstr == '-' || *numstr == '+' || (isspace)(*numstr))
  31                 goto inval;
  32
  33         /* Since this is a lib function, we're not allowed to reset errno to 0.
  34          * Doing so could break an app that is deferring checking of errno.
  35          * So, save the old value so that we can restore it if successful. */
  36         old_errno = errno;
  37         errno = 0;
  38         r = XSTR_STRTOU(numstr, &e, base);
  39         /* Do the initial validity check.  Note: The standards do not
  40          * guarantee that errno is set if no digits were found.  So we
  41          * must test for this explicitly. */
  42         if (errno || numstr == e)
  43                 goto inval; /* error / no digits / illegal trailing chars */
  44
  45         errno = old_errno;      /* Ok.  So restore errno. */
  46
  47         /* Do optional suffix parsing.  Allow 'empty' suffix tables.
  48          * Note that we also allow nul suffixes with associated multipliers,
  49          * to allow for scaling of the numstr by some default multiplier. */
  50         if (suffixes) {
  51                 while (suffixes->mult) {
  52                         if (strcmp(suffixes->suffix, e) == 0) {
  53                                 if (XSTR_UTYPE_MAX / suffixes->mult < r)
  54                                         goto range; /* overflow! */
  55                                 r *= suffixes->mult;
  56                                 goto chk_range;
  57                         }
  58                         ++suffixes;
  59                 }
  60         }
  61
  62         /* Note: trailing space is an error.
  63            It would be easy enough to allow though if desired. */
  64         if (*e)
  65                 goto inval;
  66  chk_range:
  67         /* Finally, check for range limits. */
  68         if (r >= lower && r <= upper)
  69                 return r;
  70  range:
  71         bb_error_msg_and_die("number %s is not in %llu..%llu range",
  72                 numstr, (unsigned long long)lower,
  73                 (unsigned long long)upper);
  74  inval:
  75         bb_error_msg_and_die("invalid number '%s'", numstr);
  76 }
  77
  78 unsigned type FAST_FUNC xstrtou(_range)(const char *numstr, int base,
  79                 unsigned type lower,
  80                 unsigned type upper)
  81 {
  82         return xstrtou(_range_sfx)(numstr, base, lower, upper, NULL);
  83 }
  84
  85 unsigned type FAST_FUNC xstrtou(_sfx)(const char *numstr, int base,
  86                 const struct suffix_mult *suffixes)
  87 {
  88         return xstrtou(_range_sfx)(numstr, base, 0, XSTR_UTYPE_MAX, suffixes);
  89 }
  90
  91 unsigned type FAST_FUNC xstrtou()(const char *numstr, int base)
  92 {
  93         return xstrtou(_range_sfx)(numstr, base, 0, XSTR_UTYPE_MAX, NULL);
  94 }
  95
  96 unsigned type FAST_FUNC xatou(_range_sfx)(const char *numstr,
  97                 unsigned type lower,
  98                 unsigned type upper,
  99                 const struct suffix_mult *suffixes)
 100 {
 101         return xstrtou(_range_sfx)(numstr, 10, lower, upper, suffixes);
 102 }
 103
 104 unsigned type FAST_FUNC xatou(_range)(const char *numstr,
 105                 unsigned type lower,
 106                 unsigned type upper)
 107 {
 108         return xstrtou(_range_sfx)(numstr, 10, lower, upper, NULL);
 109 }
 110
 111 unsigned type FAST_FUNC xatou(_sfx)(const char *numstr,
 112                 const struct suffix_mult *suffixes)
 113 {
 114         return xstrtou(_range_sfx)(numstr, 10, 0, XSTR_UTYPE_MAX, suffixes);
 115 }
 116
 117 unsigned type FAST_FUNC xatou()(const char *numstr)
 118 {
 119         return xatou(_sfx)(numstr, NULL);
 120 }
 121
 122 /* Signed ones */
 123
 124 type FAST_FUNC xstrto(_range_sfx)(const char *numstr, int base,
 125                 type lower,
 126                 type upper,
 127                 const struct suffix_mult *suffixes)
 128 {
 129         unsigned type u = XSTR_TYPE_MAX;
 130         type r;
 131         const char *p = numstr;
 132
 133         /* NB: if you'll decide to disallow '+':
 134          * at least renice applet needs to allow it */
 135         if (p[0] == '+' || p[0] == '-') {
 136                 ++p;
 137                 if (p[0] == '-')
 138                         ++u; /* = <type>_MIN (01111... + 1 == 10000...) */
 139         }
 140
 141         r = xstrtou(_range_sfx)(p, base, 0, u, suffixes);
 142
 143         if (*numstr == '-') {
 144                 r = -r;
 145         }
 146
 147         if (r < lower || r > upper) {
 148                 bb_error_msg_and_die("number %s is not in %lld..%lld range",
 149                                 numstr, (long long)lower, (long long)upper);
 150         }
 151
 152         return r;
 153 }
 154
 155 type FAST_FUNC xstrto(_range)(const char *numstr, int base, type lower, type upper)
 156 {
 157         return xstrto(_range_sfx)(numstr, base, lower, upper, NULL);
 158 }
 159
 160 type FAST_FUNC xato(_range_sfx)(const char *numstr,
 161                 type lower,
 162                 type upper,
 163                 const struct suffix_mult *suffixes)
 164 {
 165         return xstrto(_range_sfx)(numstr, 10, lower, upper, suffixes);
 166 }
 167
 168 type FAST_FUNC xato(_range)(const char *numstr, type lower, type upper)
 169 {
 170         return xstrto(_range_sfx)(numstr, 10, lower, upper, NULL);
 171 }
 172
 173 type FAST_FUNC xato(_sfx)(const char *numstr, const struct suffix_mult *suffixes)
 174 {
 175         return xstrto(_range_sfx)(numstr, 10, XSTR_TYPE_MIN, XSTR_TYPE_MAX, suffixes);
 176 }
 177
 178 type FAST_FUNC xato()(const char *numstr)
 179 {
 180         return xstrto(_range_sfx)(numstr, 10, XSTR_TYPE_MIN, XSTR_TYPE_MAX, NULL);
 181 }
 182
 183 #undef type
 184 #undef xstrtou
 185 #undef xstrto
 186 #undef xatou
 187 #undef xato
 188 #undef XSTR_UTYPE_MAX
 189 #undef XSTR_TYPE_MAX
 190 #undef XSTR_TYPE_MIN
 191 #undef XSTR_STRTOU