/* __gmp_sscanf_funs -- support for formatted input from a string.

   THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY.  THEY'RE ALMOST

   CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN

   FUTURE GNU MP RELEASES.

Copyright 2001-2003, 2009 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP Library is free software; you can redistribute it and/or modify

it under the terms of either:

  * the GNU Lesser General Public License as published by the Free

    Software Foundation; either version 3 of the License, or (at your

    option) any later version.

or

  * the GNU General Public License as published by the Free Software

    Foundation; either version 2 of the License, or (at your option) any

    later version.

or both in parallel, as here.

The GNU MP 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 General Public License

for more details.

You should have received copies of the GNU General Public License and the

GNU Lesser General Public License along with the GNU MP Library.  If not,

see https://www.gnu.org/licenses/.  */

#include <stdio.h>

#include <stdarg.h>

#include "gmp.h"

#include "gmp-impl.h"

#if 0

static int

scan (const char **sp, const char *fmt, ...)

{

    va_list ap;

    int ret;

    va_start(ap, fmt);

    ret = vsscanf(*sp, fmt, ap);

    va_end(ap);

    return ret;

}

#else

static int

scan (const char **sp, const char *fmt, ...)

{

  va_list ap;

  void *p1, *p2;

  int ret;

  va_start (ap, fmt);

  p1 = va_arg (ap, void *);

  p2 = va_arg (ap, void *);

  ret = sscanf (*sp, fmt, p1, p2);

  va_end (ap);

  return ret;

}

#endif

static void

step (const char **sp, int n)

{

  ASSERT (n >= 0);

  /* shouldn't push us past the end of the string */

#if WANT_ASSERT

  {

    int  i;

    for (i = 0; i < n; i++)

      ASSERT ((*sp)[i] != '\0');

  }

#endif

  (*sp) += n;

}

static int

get (const char **sp)

{

  const char  *s;

  int  c;

  s = *sp;

  c = (unsigned char) *s++;

  if (c == '\0')

    return EOF;

  *sp = s;

  return c;

}

static void

unget (int c, const char **sp)

{

  const char  *s;

  s = *sp;

  if (c == EOF)

    {

      ASSERT (*s == '\0');

      return;

    }

  s--;

  ASSERT ((unsigned char) *s == c);

  *sp = s;

}

const struct gmp_doscan_funs_t  __gmp_sscanf_funs = {

  (gmp_doscan_scan_t)  scan,

  (gmp_doscan_step_t)  step,

  (gmp_doscan_get_t)   get,

  (gmp_doscan_unget_t) unget,

};