| 1 | /* realloc() function that is glibc compatible.
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| 2 |
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| 3 | Copyright (C) 1997, 2003-2004, 2006-2007, 2009-2012 Free Software
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| 4 | Foundation, Inc.
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| 5 |
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| 6 | This program is free software: you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 3 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 18 |
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| 19 | /* written by Jim Meyering and Bruno Haible */
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| 20 |
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| 21 | #define _GL_USE_STDLIB_ALLOC 1
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| 22 | #include <config.h>
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| 23 |
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| 24 | /* Only the AC_FUNC_REALLOC macro defines 'realloc' already in config.h. */
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| 25 | #ifdef realloc
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| 26 | # define NEED_REALLOC_GNU 1
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| 27 | /* Whereas the gnulib module 'realloc-gnu' defines HAVE_REALLOC_GNU. */
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| 28 | #elif GNULIB_REALLOC_GNU && !HAVE_REALLOC_GNU
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| 29 | # define NEED_REALLOC_GNU 1
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| 30 | #endif
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| 31 |
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| 32 | /* Infer the properties of the system's malloc function.
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| 33 | The gnulib module 'malloc-gnu' defines HAVE_MALLOC_GNU. */
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| 34 | #if GNULIB_MALLOC_GNU && HAVE_MALLOC_GNU
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| 35 | # define SYSTEM_MALLOC_GLIBC_COMPATIBLE 1
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| 36 | #endif
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| 37 |
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| 38 | #include <stdlib.h>
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| 39 |
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| 40 | #include <errno.h>
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| 41 |
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| 42 | /* Change the size of an allocated block of memory P to N bytes,
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| 43 | with error checking. If N is zero, change it to 1. If P is NULL,
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| 44 | use malloc. */
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| 45 |
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| 46 | void *
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| 47 | rpl_realloc (void *p, size_t n)
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| 48 | {
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| 49 | void *result;
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| 50 |
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| 51 | #if NEED_REALLOC_GNU
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| 52 | if (n == 0)
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| 53 | {
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| 54 | n = 1;
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| 55 |
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| 56 | /* In theory realloc might fail, so don't rely on it to free. */
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| 57 | free (p);
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| 58 | p = NULL;
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| 59 | }
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| 60 | #endif
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| 61 |
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| 62 | if (p == NULL)
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| 63 | {
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| 64 | #if GNULIB_REALLOC_GNU && !NEED_REALLOC_GNU && !SYSTEM_MALLOC_GLIBC_COMPATIBLE
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| 65 | if (n == 0)
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| 66 | n = 1;
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| 67 | #endif
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| 68 | result = malloc (n);
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| 69 | }
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| 70 | else
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| 71 | result = realloc (p, n);
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| 72 |
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| 73 | #if !HAVE_REALLOC_POSIX
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| 74 | if (result == NULL)
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| 75 | errno = ENOMEM;
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| 76 | #endif
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| 77 |
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| 78 | return result;
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| 79 | }
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