/* Test feature wrapper for formatted 'sscanf' input.
   Copyright (C) 2025 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 Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>

#include <support/support.h>

static char *sscanf_buf;
static size_t sscanf_buf_size;

static void __attribute__ ((destructor))
scanf_under_test_fini (void)
{
  free (sscanf_buf);
}

#define scanf_under_test(...)						\
({									\
  __label__ out;							\
  size_t i = 0;								\
  int result;								\
  int ch;								\
									\
  do									\
    {									\
      ch = read_input ();						\
      if (ch < 0)							\
	{								\
	  result = ch;							\
	  goto out;							\
	}								\
      if (i == sscanf_buf_size)						\
	{								\
	  sscanf_buf_size += SIZE_CHUNK;				\
	  /* Add an extra byte for the terminating null character.  */	\
	  sscanf_buf = xrealloc (sscanf_buf, sscanf_buf_size + 1);	\
	}								\
      sscanf_buf[i++] = ch;						\
    }									\
  while (ch != ':');							\
  sscanf_buf[i++] = '\0';						\
									\
  ch = ungetc (ch, stdin);						\
  if (ch == EOF)							\
    {									\
      result = INPUT_ERROR;						\
      goto out;								\
    }									\
									\
  result = sscanf (sscanf_buf, __VA_ARGS__);				\
  if (result == EOF)							\
    result = INPUT_EOF;							\
									\
out:									\
  result;								\
})
