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   if (!valid_suffixes)
  95     {
  96       if (**p == '\0')
  97         {
  98           *val = tmp;
  99           return LONGINT_OK;
 100         }
 101       else
 102         return LONGINT_INVALID_SUFFIX_CHAR;
 103     }
 104
 105   if (**p != '\0')
 106     {
 107       if (!strchr (valid_suffixes, **p))
 108         return LONGINT_INVALID_SUFFIX_CHAR;
 109
 110       switch (**p)
 111         {
 112         case 'b':
 113           BKM_SCALE (tmp, 512, LONGINT_OVERFLOW);
 114           ++(*p);
 115           break;
 116
 117         case 'c':
 118           ++(*p);
 119           break;
 120
 121         case 'B':
 122         case 'k':
 123           BKM_SCALE (tmp, 1024, LONGINT_OVERFLOW);
 124           ++(*p);
 125           break;
 126
 127         case 'm':
 128           BKM_SCALE (tmp, 1024 * 1024, LONGINT_OVERFLOW);
 129           ++(*p);
 130           break;
 131
 132         case 'w':
 133           BKM_SCALE (tmp, 2, LONGINT_OVERFLOW);
 134           ++(*p);
 135           break;
 136
 137         default:
 138           return LONGINT_INVALID_SUFFIX_CHAR;
 139           break;
 140         }
 141     }
 142
 143   *val = tmp;
 144   return LONGINT_OK;
 145 }
 146
 147 #ifdef TESTING_XSTRTO
 148
 149 # include <stdio.h>
 150 # include "error.h"
 151
 152 char *program_name;
 153
 154 int
 155 main (int argc, char** argv)
 156 {
 157   strtol_error s_err;
 158   int i;
 159
 160   program_name = argv[0];
 161   for (i=1; i<argc; i++)
 162     {
 163       char *p;
 164       __unsigned long int val;
 165
 166       s_err = __xstrtol (argv[i], &p, 0, &val, "bckmw");
 167       if (s_err == LONGINT_OK)
 168         {
 169           printf ("%s->%lu (%s)\n", argv[i], val, p);
 170         }
 171       else
 172         {
 173           STRTOL_FATAL_ERROR (argv[i], "arg", s_err);
 174         }
 175     }
 176   exit (0);
 177 }
 178
 179 #endif /* TESTING_XSTRTO */