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glibc/malloc/tst-realloc.c
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/* Copyright (C) 2013-2016 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 | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <malloc.h> | |
#include <stdio.h> | |
#include <string.h> | |
static int errors = 0; | |
static void | |
merror (const char *msg) | |
{ | |
++errors; | |
printf ("Error: %s\n", msg); | |
} | |
static int | |
do_test (void) | |
{ | |
void *p; | |
unsigned char *c; | |
int save, i, ok; | |
errno = 0; | |
/* realloc (NULL, ...) behaves similarly to malloc (C89). */ | |
p = realloc (NULL, -1); | |
save = errno; | |
if (p != NULL) | |
merror ("realloc (NULL, -1) succeeded."); | |
/* errno should be set to ENOMEM on failure (POSIX). */ | |
if (p == NULL && save != ENOMEM) | |
merror ("errno is not set correctly"); | |
errno = 0; | |
/* realloc (NULL, ...) behaves similarly to malloc (C89). */ | |
p = realloc (NULL, 10); | |
save = errno; | |
if (p == NULL) | |
merror ("realloc (NULL, 10) failed."); | |
/* errno should be clear on success (POSIX). */ | |
if (p != NULL && save != 0) | |
merror ("errno is set but should not be"); | |
free (p); | |
p = calloc (20, 1); | |
if (p == NULL) | |
merror ("calloc (20, 1) failed."); | |
/* Check increasing size preserves contents (C89). */ | |
p = realloc (p, 200); | |
if (p == NULL) | |
merror ("realloc (p, 200) failed."); | |
c = p; | |
ok = 1; | |
for (i = 0; i < 20; i++) | |
{ | |
if (c[i] != 0) | |
ok = 0; | |
} | |
if (ok == 0) | |
merror ("first 20 bytes were not cleared"); | |
free (p); | |
p = realloc (NULL, 100); | |
if (p == NULL) | |
merror ("realloc (NULL, 100) failed."); | |
memset (p, 0xff, 100); | |
/* Check decreasing size preserves contents (C89). */ | |
p = realloc (p, 16); | |
if (p == NULL) | |
merror ("realloc (p, 16) failed."); | |
c = p; | |
ok = 1; | |
for (i = 0; i < 16; i++) | |
{ | |
if (c[i] != 0xff) | |
ok = 0; | |
} | |
if (ok == 0) | |
merror ("first 16 bytes were not correct"); | |
/* Check failed realloc leaves original untouched (C89). */ | |
c = realloc (p, -1); | |
if (c != NULL) | |
merror ("realloc (p, -1) succeeded."); | |
c = p; | |
ok = 1; | |
for (i = 0; i < 16; i++) | |
{ | |
if (c[i] != 0xff) | |
ok = 0; | |
} | |
if (ok == 0) | |
merror ("first 16 bytes were not correct after failed realloc"); | |
/* realloc (p, 0) frees p (C89) and returns NULL (glibc). */ | |
p = realloc (p, 0); | |
if (p != NULL) | |
merror ("realloc (p, 0) returned non-NULL."); | |
/* realloc (NULL, 0) acts like malloc (0) (glibc). */ | |
p = realloc (NULL, 0); | |
if (p == NULL) | |
merror ("realloc (NULL, 0) returned NULL."); | |
free (p); | |
return errors != 0; | |
} | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" |