stdio-common/isoc99_scanf.c

   1 /* Copyright (C) 1991-2017 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <stdarg.h>
  19 #include <stdio.h>
  20 #include <libioP.h>
  21
  22
  23 /* Read formatted input from stdin according to the format string FORMAT.  */
  24 /* VARARGS1 */
  25 int
  26 __isoc99_scanf (const char *format, ...)
  27 {
  28   va_list arg;
  29   int done;
  30
  31 #ifdef _IO_MTSAFE_IO
  32   _IO_acquire_lock_clear_flags2 (stdin);
  33 #endif
  34   stdin->_flags2 |= _IO_FLAGS2_SCANF_STD;
  35
  36   va_start (arg, format);
  37   done = _IO_vfscanf (stdin, format, arg, NULL);
  38   va_end (arg);
  39
  40 #ifdef _IO_MTSAFE_IO
  41   _IO_release_lock (stdin);
  42 #endif
  43   return done;
  44 }