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Diffstat (limited to 'source3/lib/util_malloc.c')
| -rw-r--r-- | source3/lib/util_malloc.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/source3/lib/util_malloc.c b/source3/lib/util_malloc.c new file mode 100644 index 00000000000..c052adc41bb --- /dev/null +++ b/source3/lib/util_malloc.c @@ -0,0 +1,171 @@ +/* + Unix SMB/CIFS implementation. + Samba utility functions + Copyright (C) Andrew Tridgell 1992-1998 + Copyright (C) Jeremy Allison 2001-2007 + Copyright (C) Simo Sorce 2001 + Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003 + Copyright (C) James Peach 2006 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" + +/* Max allowable allococation - 256mb - 0x10000000 */ +#define MAX_ALLOC_SIZE (1024*1024*256) + +#if defined(PARANOID_MALLOC_CHECKER) + +/**************************************************************************** + Internal malloc wrapper. Externally visible. +****************************************************************************/ + +void *malloc_(size_t size) +{ + if (size == 0) { + return NULL; + } +#undef malloc + return malloc(size); +#define malloc(s) __ERROR_DONT_USE_MALLOC_DIRECTLY +} + +/**************************************************************************** + Internal calloc wrapper. Not externally visible. +****************************************************************************/ + +static void *calloc_(size_t count, size_t size) +{ + if (size == 0 || count == 0) { + return NULL; + } +#undef calloc + return calloc(count, size); +#define calloc(n,s) __ERROR_DONT_USE_CALLOC_DIRECTLY +} + +/**************************************************************************** + Internal realloc wrapper. Not externally visible. +****************************************************************************/ + +static void *realloc_(void *ptr, size_t size) +{ +#undef realloc + return realloc(ptr, size); +#define realloc(p,s) __ERROR_DONT_USE_RELLOC_DIRECTLY +} + +#endif /* PARANOID_MALLOC_CHECKER */ + +/**************************************************************************** + Type-safe memalign +****************************************************************************/ + +void *memalign_array(size_t el_size, size_t align, unsigned int count) +{ + if (count >= MAX_ALLOC_SIZE/el_size) { + return NULL; + } + + return sys_memalign(align, el_size*count); +} + +/**************************************************************************** + Type-safe calloc. +****************************************************************************/ + +void *calloc_array(size_t size, size_t nmemb) +{ + if (nmemb >= MAX_ALLOC_SIZE/size) { + return NULL; + } + if (size == 0 || nmemb == 0) { + return NULL; + } +#if defined(PARANOID_MALLOC_CHECKER) + return calloc_(nmemb, size); +#else + return calloc(nmemb, size); +#endif +} + +/**************************************************************************** + Expand a pointer to be a particular size. + Note that this version of Realloc has an extra parameter that decides + whether to free the passed in storage on allocation failure or if the + new size is zero. + + This is designed for use in the typical idiom of : + + p = SMB_REALLOC(p, size) + if (!p) { + return error; + } + + and not to have to keep track of the old 'p' contents to free later, nor + to worry if the size parameter was zero. In the case where NULL is returned + we guarentee that p has been freed. + + If free later semantics are desired, then pass 'free_old_on_error' as False which + guarentees that the old contents are not freed on error, even if size == 0. To use + this idiom use : + + tmp = SMB_REALLOC_KEEP_OLD_ON_ERROR(p, size); + if (!tmp) { + SAFE_FREE(p); + return error; + } else { + p = tmp; + } + + Changes were instigated by Coverity error checking. JRA. +****************************************************************************/ + +void *Realloc(void *p, size_t size, bool free_old_on_error) +{ + void *ret=NULL; + + if (size == 0) { + if (free_old_on_error) { + SAFE_FREE(p); + } + DEBUG(2,("Realloc asked for 0 bytes\n")); + return NULL; + } + +#if defined(PARANOID_MALLOC_CHECKER) + if (!p) { + ret = (void *)malloc_(size); + } else { + ret = (void *)realloc_(p,size); + } +#else + if (!p) { + ret = (void *)malloc(size); + } else { + ret = (void *)realloc(p,size); + } +#endif + + if (!ret) { + if (free_old_on_error && p) { + SAFE_FREE(p); + } + DEBUG(0,("Memory allocation error: failed to expand to %d bytes\n",(int)size)); + } + + return(ret); +} + |