stdio/vsscanf.c

   1 /* Copyright (C) 1991, 1992, 1995, 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library 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 GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <errno.h>
  20 #include <stdarg.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24 #undef  vsscanf
  25
  26
  27 /* Read formatted input from S according to the format
  28    string FORMAT, using the argument list in ARG.  */
  29 int
  30 __vsscanf (s, format, arg)
  31      const char *s;
  32      const char *format;
  33      va_list arg;
  34 {
  35   FILE f;
  36
  37   if (s == NULL)
  38     {
  39       __set_errno (EINVAL);
  40       return -1;
  41     }
  42
  43   memset ((void *) &f, 0, sizeof (f));
  44   f.__magic = _IOMAGIC;
  45   f.__mode.__read = 1;
  46   f.__bufp = f.__buffer = (char *) s;
  47   f.__bufsize = strlen(s);
  48   f.__get_limit = f.__buffer + f.__bufsize;
  49   f.__put_limit = f.__buffer;
  50   /* After the buffer is empty (strlen(S) characters have been read),
  51      any more read attempts will get EOF.  */
  52   f.__room_funcs.__input = NULL;
  53   f.__seen = 1;
  54
  55   return __vfscanf (&f, format, arg);
  56 }
  57
  58
  59 weak_alias (__vsscanf, vsscanf)