lib/sh/strtoumax.c

   1 /* strtoumax - convert string representation of a number into an uintmax_t value. */
   2
   3 /* Copyright 1999-2020,2022 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    Bash is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 /* Written by Paul Eggert.  Modified by Chet Ramey for Bash. */
  22
  23 #if HAVE_CONFIG_H
  24 #  include <config.h>
  25 #endif
  26
  27 #if HAVE_INTTYPES_H
  28 #  include <inttypes.h>
  29 #endif
  30
  31 #if HAVE_STDINT_H
  32 #  include <stdint.h>
  33 #endif
  34
  35 #if HAVE_STDLIB_H
  36 #  include <stdlib.h>
  37 #endif
  38
  39 #include <stdc.h>
  40
  41 /* Verify a requirement at compile-time (unlike assert, which is runtime).  */
  42 #define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; }
  43
  44 #ifndef HAVE_DECL_STRTOUL
  45 "this configure-time declaration test was not run"
  46 #endif
  47 #if !HAVE_DECL_STRTOUL
  48 extern unsigned long strtoul (const char *, char **, int);
  49 #endif
  50
  51 #ifndef HAVE_DECL_STRTOULL
  52 "this configure-time declaration test was not run"
  53 #endif
  54 #if !HAVE_DECL_STRTOULL && HAVE_UNSIGNED_LONG_LONG_INT
  55 extern unsigned long long strtoull (const char *, char **, int);
  56 #endif
  57
  58 #ifdef strtoumax
  59 #undef strtoumax
  60 #endif
  61
  62 uintmax_t
  63 strtoumax (const char *ptr, char **endptr, int base)
  64 {
  65 #if HAVE_UNSIGNED_LONG_LONG_INT
  66   verify (size_is_that_of_unsigned_long_or_unsigned_long_long,
  67           (sizeof (uintmax_t) == sizeof (unsigned long) ||
  68            sizeof (uintmax_t) == sizeof (unsigned long long)));
  69
  70   if (sizeof (uintmax_t) != sizeof (unsigned long))
  71     return (strtoull (ptr, endptr, base));
  72 #else
  73   verify (size_is_that_of_unsigned_long, sizeof (uintmax_t) == sizeof (unsigned long));
  74 #endif
  75
  76   return (strtoul (ptr, endptr, base));
  77 }
  78
  79 #ifdef TESTING
  80 # include <stdio.h>
  81 int
  82 main ()
  83 {
  84   char *p, *endptr;
  85   uintmax_t x;
  86 #if HAVE_UNSIGNED_LONG_LONG_INT
  87   unsigned long long y;
  88 #endif
  89   unsigned long z;
  90
  91   printf ("sizeof uintmax_t: %d\n", sizeof (uintmax_t));
  92
  93 #if HAVE_UNSIGNED_LONG_LONG_INT
  94   printf ("sizeof unsigned long long: %d\n", sizeof (unsigned long long));
  95 #endif
  96   printf ("sizeof unsigned long: %d\n", sizeof (unsigned long));
  97
  98   x = strtoumax("42", &endptr, 10);
  99 #if HAVE_LONG_LONG_INT
 100   y = strtoull("42", &endptr, 10);
 101 #else
 102   y = 0;
 103 #endif
 104   z = strtoul("42", &endptr, 10);
 105
 106   printf ("%llu %llu %lu\n", x, y, z);
 107
 108   exit (0);
 109 }
 110 #endif