lib/xstrtol.c

   1 /* A more useful interface to strtol.
   2    Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Written by Jim Meyering. */
  19
  20 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #if STDC_HEADERS
  25 # include <stdlib.h>
  26 #endif
  27
  28 #if HAVE_STRING_H
  29 # include <string.h>
  30 #else
  31 # include <strings.h>
  32 # ifndef strchr
  33 #  define strchr index
  34 # endif
  35 #endif
  36
  37 #define NDEBUG
  38 #include <assert.h>
  39
  40 #include <errno.h>
  41 #ifndef errno
  42 extern int errno;
  43 #endif
  44
  45 #if HAVE_LIMITS_H
  46 # include <limits.h>
  47 #endif
  48
  49 #ifndef ULONG_MAX
  50 # define ULONG_MAX ((unsigned long) ~(unsigned long) 0)
  51 #endif
  52
  53 #ifndef LONG_MAX
  54 # define LONG_MAX ((long int) (ULONG_MAX >> 1))
  55 #endif
  56
  57 #include "xstrtol.h"
  58
  59 #define BKM_SCALE(x, scale_factor, error_return)                        \
  60       do                                                                \
  61         {                                                               \
  62           if ((x) > (double) __ZLONG_MAX / (scale_factor))              \
  63             return (error_return);                                      \
  64           (x) *= (scale_factor);                                        \
  65         }                                                               \
  66       while (0)
  67
  68 __unsigned long int __strtol ();
  69
  70 /* FIXME: comment.  */
  71
  72 strtol_error
  73 __xstrtol (s, ptr, base, val, valid_suffixes)
  74      const char *s;
  75      char **ptr;
  76      int base;
  77      __unsigned long int *val;
  78      const char *valid_suffixes;
  79 {
  80   char *t_ptr;
  81   char **p;
  82   __unsigned long int tmp;
  83
  84   assert (0 <= base && base <= 36);
  85
  86   p = (ptr ? ptr : &t_ptr);
  87
  88   errno = 0;
  89   tmp = __strtol (s, p, base);
  90   if (errno != 0)
  91     return LONGINT_OVERFLOW;
  92   if (*p == s)
  93     return LONGINT_INVALID;
  94
  95   /* Let valid_suffixes == NULL mean `allow any suffix'.  */
  96   /* FIXME: update all callers except the one in tail.c changing
  97      last parameter NULL to `""'.  */
  98   if (!valid_suffixes)
  99     {
 100       *val = tmp;
 101       return LONGINT_OK;
 102     }
 103
 104   if (**p != '\0')
 105     {
 106       if (!strchr (valid_suffixes, **p))
 107         return LONGINT_INVALID_SUFFIX_CHAR;
 108
 109       switch (**p)
 110         {
 111         case 'b':
 112           BKM_SCALE (tmp, 512, LONGINT_OVERFLOW);
 113           ++(*p);
 114           break;
 115
 116         case 'c':
 117           ++(*p);
 118           break;
 119
 120         case 'B':
 121         case 'k':
 122           BKM_SCALE (tmp, 1024, LONGINT_OVERFLOW);
 123           ++(*p);
 124           break;
 125
 126         case 'm':
 127           BKM_SCALE (tmp, 1024 * 1024, LONGINT_OVERFLOW);
 128           ++(*p);
 129           break;
 130
 131         case 'w':
 132           BKM_SCALE (tmp, 2, LONGINT_OVERFLOW);
 133           ++(*p);
 134           break;
 135
 136         default:
 137           return LONGINT_INVALID_SUFFIX_CHAR;
 138           break;
 139         }
 140     }
 141
 142   *val = tmp;
 143   return LONGINT_OK;
 144 }
 145
 146 #ifdef TESTING_XSTRTO
 147
 148 # include <stdio.h>
 149 # include "error.h"
 150
 151 char *program_name;
 152
 153 int
 154 main (int argc, char** argv)
 155 {
 156   strtol_error s_err;
 157   int i;
 158
 159   program_name = argv[0];
 160   for (i=1; i<argc; i++)
 161     {
 162       char *p;
 163       __unsigned long int val;
 164
 165       s_err = __xstrtol (argv[i], &p, 0, &val, "bckmw");
 166       if (s_err == LONGINT_OK)
 167         {
 168           printf ("%s->%lu (%s)\n", argv[i], val, p);
 169         }
 170       else
 171         {
 172           STRTOL_FATAL_ERROR (argv[i], "arg", s_err);
 173         }
 174     }
 175   exit (0);
 176 }
 177
 178 #endif /* TESTING_XSTRTO */