diff options
Diffstat (limited to 'REORG.TODO/malloc/tst-realloc.c')
| -rw-r--r-- | REORG.TODO/malloc/tst-realloc.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/REORG.TODO/malloc/tst-realloc.c b/REORG.TODO/malloc/tst-realloc.c new file mode 100644 index 0000000000..31a58bd026 --- /dev/null +++ b/REORG.TODO/malloc/tst-realloc.c @@ -0,0 +1,161 @@ +/* Copyright (C) 2013-2017 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> +#include <libc-diag.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). */ + DIAG_PUSH_NEEDS_COMMENT; +#if __GNUC_PREREQ (7, 0) + /* GCC 7 warns about too-large allocations; here we want to test + that they fail. */ + DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than="); +#endif + p = realloc (NULL, -1); + DIAG_POP_NEEDS_COMMENT; + 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). */ + DIAG_PUSH_NEEDS_COMMENT; +#if __GNUC_PREREQ (7, 0) + /* GCC 7 warns about too-large allocations; here we want to test + that they fail. */ + DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than="); +#endif + c = realloc (p, -1); + DIAG_POP_NEEDS_COMMENT; + 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" |