/* Test of getdelim() function.

   Copyright (C) 2007-2020 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3, or (at your option)

   any later version.

   This program 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 a copy of the GNU General Public License

   along with this program; if not, see <https://www.gnu.org/licenses/>.  */

/* Written by Eric Blake <ebb9@byu.net>, 2007.  */

#include <config.h>

#include <stdio.h>

#include "signature.h"

SIGNATURE_CHECK (getdelim, ssize_t, (char **, size_t *, int, FILE *));

#include <stdlib.h>

#include <string.h>

#include "macros.h"

int

main (void)

{

  FILE *f;

  char *line;

  size_t len;

  ssize_t result;

  /* Create test file.  */

  f = fopen ("test-getdelim.txt", "wb");

  if (!f || fwrite ("anAnbcnd\0f", 1, 10, f) != 10 || fclose (f) != 0)

    {

      fputs ("Failed to create sample file.\n", stderr);

      remove ("test-getdelim.txt");

      return 1;

    }

  f = fopen ("test-getdelim.txt", "rb");

  if (!f)

    {

      fputs ("Failed to reopen sample file.\n", stderr);

      remove ("test-getdelim.txt");

      return 1;

    }

  /* Test initial allocation, which must include trailing NUL.  */

  line = NULL;

  len = 0;

  result = getdelim (&line, &len, 'n', f);

  ASSERT (result == 2);

  ASSERT (strcmp (line, "an") == 0);

  ASSERT (2 < len);

  free (line);

  /* Test initial allocation again, with line = NULL and len != 0.  */

  line = NULL;

  len = (size_t)(~0) / 4;

  result = getdelim (&line, &len, 'n', f);

  ASSERT (result == 2);

  ASSERT (strcmp (line, "An") == 0);

  ASSERT (2 < len);

  free (line);

  /* Test growth of buffer.  */

  line = malloc (1);

  len = 1;

  result = getdelim (&line, &len, 'n', f);

  ASSERT (result == 3);

  ASSERT (strcmp (line, "bcn") == 0);

  ASSERT (3 < len);

  /* Test embedded NULs and EOF behavior.  */

  result = getdelim (&line, &len, 'n', f);

  ASSERT (result == 3);

  ASSERT (memcmp (line, "d\0f", 4) == 0);

  ASSERT (3 < len);

  result = getdelim (&line, &len, 'n', f);

  ASSERT (result == -1);

  free (line);

  fclose (f);

  remove ("test-getdelim.txt");

  return 0;

}