path: root/stdio-common/vfscanf.c

/* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <ansidecl.h>
#include "../locale/localeinfo.h"
#include <errno.h>
#include <limits.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


#ifdef	__GNUC__
#define	HAVE_LONGLONG
#define	LONGLONG	long long
#else
#define	LONGLONG	long
#endif

/* Those are flags in the conversion format. */
# define LONG		0x001	/* l: long or double */
# define LONGDBL	0x002	/* L: long long or long double */
# define SHORT		0x004	/* h: short */
# define SUPPRESS	0x008	/* *: suppress assignment */
# define POINTER	0x010	/* weird %p pointer (`fake hex') */
# define NOSKIP		0x020	/* do not skip blanks */
# define WIDTH		0x040	/* width was given */
# define GROUP		0x080	/* ': group numbers */
# define MALLOC		0x100	/* a: malloc strings */

# define TYPEMOD	(LONG|LONGDBL|SHORT)


#ifdef USE_IN_LIBIO
# include <libioP.h>
# include <libio.h>

# define va_list	_IO_va_list
# define ungetc(c, s)	_IO_ungetc (c, s)
# define inchar()	((c = _IO_getc (s)), (void) ++read_in, c)
# define conv_error()	return ((void) (errp != NULL && (*errp |= 2)), \
				(void) (c == EOF || _IO_ungetc (c, s)), done)

# define input_error()	return ((void) (errp != NULL && (*errp |= 1)), \
				done == 0 ? EOF : done)
# define memory_error()	return ((void) (errno = ENOMEM), EOF)
# define ARGCHECK(s, format)						     \
  do									     \
    {									     \
      /* Check file argument for consistence.  */			     \
      CHECK_FILE (s, -1);						     \
      if (s->_flags & _IO_NO_READS || format == NULL)			     \
       {								     \
         MAYBE_SET_EINVAL;						     \
         return -1;							     \
       }								     \
    } while (0)
#else
# define inchar()	((c = getc (s)), (void) ++read_in, c)
# define conv_error()	return ((void) ungetc (c, s), done)
# define input_error()	return (done == 0 ? EOF : done)
# define memory_error()	return ((void) (errno = ENOMEM), EOF)
# define ARGCHECK(s, format)						     \
  do									     \
    {									     \
      /* Check file argument for consistence.  */			     \
      if (!__validfp (s) || !s->__mode.__read || format == NULL)	     \
	{								     \
	  errno = EINVAL;						     \
	  return -1;							     \
	}								     \
    } while (0)
#endif


/* Read formatted input from S according to the format string
   FORMAT, using the argument list in ARG.
   Return the number of assignments made, or -1 for an input error.  */
#ifdef USE_IN_LIBIO
int
_IO_vfscanf (s, format, argptr, errp)
     _IO_FILE *s;
     const char *format;
     _IO_va_list argptr;
     int *errp;
#else
int
__vfscanf (FILE *s, const char *format, va_list argptr)
#endif
{
  va_list arg = (va_list) argptr;

  register const char *f = format;
  register unsigned char fc;	/* Current character of the format.  */
  register size_t done = 0;	/* Assignments done.  */
  register size_t read_in = 0;	/* Chars read in.  */
  register int c;		/* Last char read.  */
  register int width;		/* Maximum field width.  */
  register int flags;		/* Modifiers for current format element.  */

  /* Status for reading F-P nums.  */