contrib/gmp/scanf/vsscanf.c

   1 /* gmp_vsscanf -- formatted input from a string.
   2
   3 Copyright 2001, 2002 Free Software Foundation, Inc.
   4
   5 This file is part of the GNU MP Library.
   6
   7 The GNU MP Library is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU Lesser General Public License as published by
   9 the Free Software Foundation; either version 3 of the License, or (at your
  10 option) any later version.
  11
  12 The GNU MP Library is distributed in the hope that it will be useful, but
  13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  15 License for more details.
  16
  17 You should have received a copy of the GNU Lesser General Public License
  18 along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
  19
  20 #include "config.h"
  21
  22 #if HAVE_STDARG
  23 #include <stdarg.h>
  24 #else
  25 #include <varargs.h>
  26 #endif
  27
  28 #include <string.h>
  29
  30 #include "gmp.h"
  31 #include "gmp-impl.h"
  32
  33
  34 int
  35 gmp_vsscanf (const char *s, const char *fmt, va_list ap)
  36 {
  37 #if SSCANF_WRITABLE_INPUT
  38   /* We only actually need this if there's standard C types in fmt, and if
  39      "s" is not already writable, but it's too much trouble to check that,
  40      and in any case this writable sscanf input business is only for a few
  41      old systems. */
  42   size_t size;
  43   char   *alloc;
  44   int    ret;
  45   size = strlen (s) + 1;
  46   alloc = (char *) (*__gmp_allocate_func) (size);
  47   memcpy (alloc, s, size);
  48   s = alloc;
  49   ret = __gmp_doscan (&__gmp_sscanf_funs, (void *) &s, fmt, ap);
  50   (*__gmp_free_func) (alloc, size);
  51   return ret;
  52
  53 #else
  54   return __gmp_doscan (&__gmp_sscanf_funs, (void *) &s, fmt, ap);
  55 #endif
  56 }