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6ec2e0f5 SDJ |
1 | /* realloc() function that is glibc compatible. |
2 | ||
5df4cba6 | 3 | Copyright (C) 1997, 2003-2004, 2006-2007, 2009-2020 Free Software |
6ec2e0f5 SDJ |
4 | Foundation, Inc. |
5 | ||
6 | This program is free software: you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
c0c3707f | 17 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
6ec2e0f5 SDJ |
18 | |
19 | /* written by Jim Meyering and Bruno Haible */ | |
20 | ||
21 | #define _GL_USE_STDLIB_ALLOC 1 | |
22 | #include <config.h> | |
23 | ||
24 | /* Only the AC_FUNC_REALLOC macro defines 'realloc' already in config.h. */ | |
25 | #ifdef realloc | |
26 | # define NEED_REALLOC_GNU 1 | |
27 | /* Whereas the gnulib module 'realloc-gnu' defines HAVE_REALLOC_GNU. */ | |
28 | #elif GNULIB_REALLOC_GNU && !HAVE_REALLOC_GNU | |
29 | # define NEED_REALLOC_GNU 1 | |
30 | #endif | |
31 | ||
32 | /* Infer the properties of the system's malloc function. | |
33 | The gnulib module 'malloc-gnu' defines HAVE_MALLOC_GNU. */ | |
34 | #if GNULIB_MALLOC_GNU && HAVE_MALLOC_GNU | |
35 | # define SYSTEM_MALLOC_GLIBC_COMPATIBLE 1 | |
36 | #endif | |
37 | ||
38 | #include <stdlib.h> | |
39 | ||
40 | #include <errno.h> | |
41 | ||
42 | /* Change the size of an allocated block of memory P to N bytes, | |
43 | with error checking. If N is zero, change it to 1. If P is NULL, | |
44 | use malloc. */ | |
45 | ||
46 | void * | |
47 | rpl_realloc (void *p, size_t n) | |
48 | { | |
49 | void *result; | |
50 | ||
51 | #if NEED_REALLOC_GNU | |
52 | if (n == 0) | |
53 | { | |
54 | n = 1; | |
55 | ||
56 | /* In theory realloc might fail, so don't rely on it to free. */ | |
57 | free (p); | |
58 | p = NULL; | |
59 | } | |
60 | #endif | |
61 | ||
62 | if (p == NULL) | |
63 | { | |
64 | #if GNULIB_REALLOC_GNU && !NEED_REALLOC_GNU && !SYSTEM_MALLOC_GLIBC_COMPATIBLE | |
65 | if (n == 0) | |
66 | n = 1; | |
67 | #endif | |
68 | result = malloc (n); | |
69 | } | |
70 | else | |
71 | result = realloc (p, n); | |
72 | ||
73 | #if !HAVE_REALLOC_POSIX | |
74 | if (result == NULL) | |
75 | errno = ENOMEM; | |
76 | #endif | |
77 | ||
78 | return result; | |
79 | } |