coreutils/gnulib-tests/test-getndelim2.c

/* Test of getndelim2() function.
   Copyright (C) 2008-2025 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>, 2008.  */

#include <config.h>

#include "getndelim2.h"

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

#include "macros.h"

int
main (void)
{
  FILE *f;
  char *line = NULL;
  size_t len = 0;
  ssize_t result;

  /* Create test file.  */
  f = fopen ("test-getndelim2.txt", "wb+");
  if (!f || fwrite ("a\nbc\nd\0f", 1, 8, f) != 8)
    {
      fputs ("Failed to create sample file.\n", stderr);
      remove ("test-getndelim2.txt");
      return 1;
    }
  rewind (f);

  /* Unlimited lines.  */

  /* Test initial allocation, which must include trailing NUL.  */
  result = getndelim2 (&line, &len, 0, GETNLINE_NO_LIMIT, '\n', '\n', f);
  ASSERT (result == 2);
  ASSERT (strcmp (line, "a\n") == 0);
  ASSERT (2 < len);

  /* Test growth of buffer, must not leak.  */
  free (line);
  line = malloc (1);
  len = 0;
  result = getndelim2 (&line, &len, 0, GETNLINE_NO_LIMIT, EOF, '\n', f);
  ASSERT (result == 3);
  ASSERT (strcmp (line, "bc\n") == 0);
  ASSERT (3 < len);

  /* Test embedded NULs and EOF behavior.  */
  result = getndelim2 (&line, &len, 0, GETNLINE_NO_LIMIT, '\n', EOF, f);
  ASSERT (result == 3);
  ASSERT (memcmp (line, "d\0f", 4) == 0);
  ASSERT (3 < len);

  result = getndelim2 (&line, &len, 0, GETNLINE_NO_LIMIT, '\n', EOF, f);
  ASSERT (result == -1);

  /* Using offset and nmax.  */

  /* Limit growth to four bytes, including NUL, but parse to next 'd'.  */
  free (line);
  rewind (f);
  line = malloc (8);
  memset (line, 'e', 8);
  len = 8;
  result = getndelim2 (&line, &len, 6, 10, 'd', 'd', f);
  ASSERT (result == 3);
  ASSERT (10 == len);
  ASSERT (strcmp (line, "eeeeeea\nb") == 0);

  /* No change if offset larger than limit.  */
  result = getndelim2 (&line, &len, len, 1, EOF, EOF, f);
  ASSERT (result == -1);
  ASSERT (10 == len);
  ASSERT (strcmp (line, "eeeeeea\nb") == 0);

  /* Consume to end of file, including embedded NUL.  */
  result = getndelim2 (&line, &len, 0, GETNLINE_NO_LIMIT, EOF, EOF, f);
  ASSERT (result == 2);
  ASSERT (10 == len);
  ASSERT (memcmp (line, "\0f\0eeea\nb", 10) == 0);

  result = getndelim2 (&line, &len, 0, GETNLINE_NO_LIMIT, '\n', '\r', f);
  ASSERT (result == -1);

  /* Larger file size.  */
  rewind (f);
  {
    int i;
    for (i = 0; i < 16; i++)
      fprintf (f, "%500x%c", i + 0u, i % 2 ? '\n' : '\r');
  }
  rewind (f);
  {
    char buffer[502];

    result = getndelim2 (&line, &len, 0, GETNLINE_NO_LIMIT, '\n', '\r', f);
    ASSERT (result == 501);
    ASSERT (501 < len);
    memset (buffer, ' ', 499);
    buffer[499] = '0';
    buffer[500] = '\r';
    buffer[501] = '\0';
    ASSERT (strcmp (buffer, line) == 0);

    result = getndelim2 (&line, &len, 0, GETNLINE_NO_LIMIT, '\n', '\r', f);
    ASSERT (result == 501);
    ASSERT (501 < len);
    buffer[499] = '1';
    buffer[500] = '\n';
    ASSERT (strcmp (buffer, line) == 0);

    result = getndelim2 (&line, &len, 0, GETNLINE_NO_LIMIT, 'g', 'f', f);
    ASSERT (result == 501 * 14 - 1);
    ASSERT (501 * 14 <= len);
    buffer[499] = 'f';
    buffer[500] = '\0';
    ASSERT (strcmp (buffer, line + 501 * 13) == 0);

    result = getndelim2 (&line, &len, 501 * 14 - 1, GETNLINE_NO_LIMIT,
                         EOF, EOF, f);
    ASSERT (result == 1);
    buffer[500] = '\n';
    ASSERT (strcmp (buffer, line + 501 * 13) == 0);

    result = getndelim2 (&line, &len, 501 * 14 - 1, GETNLINE_NO_LIMIT,
                         EOF, EOF, f);
    buffer[500] = '\0';
    ASSERT (strcmp (buffer, line + 501 * 13) == 0);
    ASSERT (result == -1);
  }

  fclose (f);
  remove ("test-getndelim2.txt");
  return test_exit_status;
}