path: root/string/test-strncmp.c

/* Test strncmp and wcsncmp functions.
   Copyright (C) 1999-2025 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/>.  */

#define TEST_LEN (getpagesize () * 3)
#define MIN_PAGE_SIZE (TEST_LEN + 2 * getpagesize ())

#define TEST_MAIN
#ifdef WIDE
# define TEST_NAME "wcsncmp"
#else
# define TEST_NAME "strncmp"
#endif
#define TIMEOUT (5 * 60)
#include "test-string.h"

#ifdef WIDE
# include <wchar.h>

# define L(str) L##str
# define STRNCMP wcsncmp
# define STRCPY wcscpy
# define STRDUP wcsdup
# define MEMCPY wmemcpy
# define SIMPLE_STRNCMP simple_wcsncmp
# define CHAR wchar_t
# define UCHAR wchar_t
# define CHARBYTES 4
# define CHAR__MAX WCHAR_MAX
# define CHAR__MIN WCHAR_MIN

/* Wcsncmp uses signed semantics for comparison, not unsigned.
   Avoid using subtraction since possible overflow */
int
simple_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
{
  wchar_t c1, c2;

  while (n--)
    {
      c1 = *s1++;
      c2 = *s2++;
      if (c1 == L('\0') || c1 != c2)
	return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0);
    }
  return 0;
}

#else
# define L(str) str
# define STRNCMP strncmp
# define STRCPY strcpy
# define STRDUP strdup
# define MEMCPY memcpy
# define SIMPLE_STRNCMP simple_strncmp
# define CHAR char
# define UCHAR unsigned char
# define CHARBYTES 1
# define CHAR__MAX CHAR_MAX
# define CHAR__MIN CHAR_MIN

/* Strncmp uses unsigned semantics for comparison. */
int
simple_strncmp (const char *s1, const char *s2, size_t n)
{
  int ret = 0;

  while (n-- && (ret = *(unsigned char *) s1 - * (unsigned char *) s2++) == 0
	 && *s1++);
  return ret;
}

#endif

typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);

IMPL (STRNCMP, 1)

/* Also check the default implementation.  */
#undef STRNCMP
#undef libc_hidden_builtin_def
#define libc_hidden_builtin_def(a)
#undef attribute_hidden
#define attribute_hidden
#ifndef WIDE
# define STRNCMP __strncmp_default
# include "string/strncmp.c"
# define STRNCMP_DEFAULT STRNCMP
#else
# define WCSNCMP __wcsncmp_default
# include "wcsmbs/wcsncmp.c"
# define STRNCMP_DEFAULT WCSNCMP
#endif
IMPL (STRNCMP_DEFAULT, 1)

static int
check_result (impl_t *impl, const CHAR *s1, const CHAR