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/* Test <string.h> const-generic macros.
Copyright (C) 2025-2026 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 <string.h>
#include <libc-diag.h>
void *vp;
const void *cvp;
int *ip;
const int *cip;
char *cp;
const char *ccp;
int c;
size_t sz;
#define CHECK_TYPE(EXPR, TYPE) \
_Static_assert (_Generic (EXPR, TYPE: 1), "type check")
static int
do_test (void)
{
/* This is a compilation test. */
CHECK_TYPE (memchr (vp, c, sz), void *);
CHECK_TYPE (memchr (cvp, c, sz), const void *);
CHECK_TYPE (memchr (ip, c, sz), void *);
CHECK_TYPE (memchr (cip, c, sz), const void *);
CHECK_TYPE (memchr (cp, c, sz), void *);
CHECK_TYPE (memchr (ccp, c, sz), const void *);
DIAG_PUSH_NEEDS_COMMENT;
/* This deliberately tests the type of the result with a null
pointer constant argument. */
DIAG_IGNORE_NEEDS_COMMENT (14, "-Wnonnull");
CHECK_TYPE (memchr (0, c, sz), void *);
CHECK_TYPE (memchr ((void *) 0, c, sz), void *);
DIAG_POP_NEEDS_COMMENT;
CHECK_TYPE ((memchr) (cvp, c, sz), void *);
CHECK_TYPE (strchr (vp, c), char *);
CHECK_TYPE (strchr (cvp, c), const char *);
CHECK_TYPE (strchr (cp, c), char *);
CHECK_TYPE (strchr (ccp, c), const char *);
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (14, "-Wnonnull");
CHECK_TYPE (strchr (0, c), char *);
CHECK_TYPE (strchr ((void *) 0, c), char *);
DIAG_POP_NEEDS_COMMENT;
CHECK_TYPE ((strchr) (ccp, c), char *);
CHECK_TYPE (strpbrk (vp, vp), char *);
CHECK_TYPE (strpbrk (vp, cvp), char *);
CHECK_TYPE (strpbrk (cvp, vp), const char *);
CHECK_TYPE (strpbrk (cvp, cvp), const char *);
CHECK_TYPE (strpbrk (cp, cp), char *);
CHECK_TYPE (strpbrk (cp, ccp), char *);
CHECK_TYPE (strpbrk (ccp, cp), const char *);
CHECK_TYPE (strpbrk (ccp, ccp), const char *);
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (14, "-Wnonnull");
CHECK_TYPE (strpbrk (0, cp), char *);
CHECK_TYPE (strpbrk (0, ccp), char *);
CHECK_TYPE (strpbrk ((void *) 0, cp), char *);
CHECK_TYPE (strpbrk ((void *) 0, ccp), char *);
DIAG_POP_NEEDS_COMMENT;
CHECK_TYPE ((strpbrk) (ccp, ccp), char *);
CHECK_TYPE (strrchr (vp, c), char *);
CHECK_TYPE (strrchr (cvp, c), const char *);
CHECK_TYPE (strrchr (cp, c), char *);
CHECK_TYPE (strrchr (ccp, c), const char *);
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (14, "-Wnonnull");
CHECK_TYPE (strrchr (0, c), char *);
CHECK_TYPE (strrchr ((void *) 0, c), char *);
DIAG_POP_NEEDS_COMMENT;
CHECK_TYPE ((strrchr) (ccp, c), char *);
CHECK_TYPE (strstr (vp, vp), char *);
CHECK_TYPE (strstr (vp, cvp), char *);
CHECK_TYPE (strstr (cvp, vp), const char *);
CHECK_TYPE (strstr (cvp, cvp), const char *);
CHECK_TYPE (strstr (cp, cp), char *);
CHECK_TYPE (strstr (cp, ccp), char *);
CHECK_TYPE (strstr (ccp, cp), const char *);
CHECK_TYPE (strstr (ccp, ccp), const char *);
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (14, "-Wnonnull");
CHECK_TYPE (strstr (0, cp), char *);
CHECK_TYPE (strstr (0, ccp), char *);
CHECK_TYPE (strstr ((void *) 0, cp), char *);
CHECK_TYPE (strstr ((void *) 0, ccp), char *);
DIAG_POP_NEEDS_COMMENT;
CHECK_TYPE ((strstr) (ccp, ccp), char *);
return 0;
}
#include <support/test-driver.c>
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