s3:open_files.idl: add stat-info to vfs_default_durable_cookie.
[Samba/gebeck_regimport.git] / source3 / lib / util_malloc.c
blobff78db65003782b3c9c2f387bbb3a9f9a3994581
1 /*
2 Unix SMB/CIFS implementation.
3 Samba utility functions
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Jeremy Allison 2001-2007
6 Copyright (C) Simo Sorce 2001
7 Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
8 Copyright (C) James Peach 2006
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "includes.h"
26 #if defined(PARANOID_MALLOC_CHECKER)
28 /****************************************************************************
29 Internal malloc wrapper. Externally visible.
30 ****************************************************************************/
32 void *malloc_(size_t size)
34 if (size == 0) {
35 return NULL;
37 #undef malloc
38 return malloc(size);
39 #define malloc(s) __ERROR_DONT_USE_MALLOC_DIRECTLY
42 /****************************************************************************
43 Internal realloc wrapper. Not externally visible.
44 ****************************************************************************/
46 static void *realloc_(void *ptr, size_t size)
48 #undef realloc
49 return realloc(ptr, size);
50 #define realloc(p,s) __ERROR_DONT_USE_RELLOC_DIRECTLY
53 #endif /* PARANOID_MALLOC_CHECKER */
55 /****************************************************************************
56 Expand a pointer to be a particular size.
57 Note that this version of Realloc has an extra parameter that decides
58 whether to free the passed in storage on allocation failure or if the
59 new size is zero.
61 This is designed for use in the typical idiom of :
63 p = SMB_REALLOC(p, size)
64 if (!p) {
65 return error;
68 and not to have to keep track of the old 'p' contents to free later, nor
69 to worry if the size parameter was zero. In the case where NULL is returned
70 we guarentee that p has been freed.
72 If free later semantics are desired, then pass 'free_old_on_error' as False which
73 guarentees that the old contents are not freed on error, even if size == 0. To use
74 this idiom use :
76 tmp = SMB_REALLOC_KEEP_OLD_ON_ERROR(p, size);
77 if (!tmp) {
78 SAFE_FREE(p);
79 return error;
80 } else {
81 p = tmp;
84 Changes were instigated by Coverity error checking. JRA.
85 ****************************************************************************/
87 void *Realloc(void *p, size_t size, bool free_old_on_error)
89 void *ret=NULL;
91 if (size == 0) {
92 if (free_old_on_error) {
93 SAFE_FREE(p);
95 DEBUG(2,("Realloc asked for 0 bytes\n"));
96 return NULL;
99 #if defined(PARANOID_MALLOC_CHECKER)
100 if (!p) {
101 ret = (void *)malloc_(size);
102 } else {
103 ret = (void *)realloc_(p,size);
105 #else
106 if (!p) {
107 ret = (void *)malloc(size);
108 } else {
109 ret = (void *)realloc(p,size);
111 #endif
113 if (!ret) {
114 if (free_old_on_error && p) {
115 SAFE_FREE(p);
117 DEBUG(0,("Memory allocation error: failed to expand to %d bytes\n",(int)size));
120 return(ret);