Mercurial > dovecot > original-hg > dovecot-1.2
view src/lib/mempool-system.c @ 805:5ac361acb316 HEAD
Marked all non-trivial buffer modifications with @UNSAFE tag. Several
cleanups and a couple of minor bugfixes.
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Wed, 18 Dec 2002 17:15:41 +0200 |
parents | 1b503c732877 |
children | 34cb1d196d2b |
line wrap: on
line source
/* mempool-system.c : Memory pool wrapper for malloc() + realloc() + free() Copyright (c) 2002 Timo Sirainen Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /* @UNSAFE: whole file */ #include "lib.h" #include "mempool.h" #include <stdlib.h> #define MAX_ALLOC_SIZE SSIZE_T_MAX typedef struct { union { size_t size; unsigned char alignment[MEM_ALIGN_SIZE]; } size; /* void data[]; */ } PoolAlloc; static void pool_system_ref(Pool pool); static void pool_system_unref(Pool pool); static void *pool_system_malloc(Pool pool, size_t size); static void pool_system_free(Pool pool, void *mem); static void *pool_system_realloc(Pool pool, void *mem, size_t size); static void *pool_system_realloc_min(Pool pool, void *mem, size_t size); static void pool_system_clear(Pool pool); static struct Pool static_system_pool = { pool_system_ref, pool_system_unref, pool_system_malloc, pool_system_free, pool_system_realloc, pool_system_realloc_min, pool_system_clear }; Pool system_pool = &static_system_pool; static void pool_system_ref(Pool pool __attr_unused__) { } static void pool_system_unref(Pool pool __attr_unused__) { } static void *pool_system_malloc(Pool pool __attr_unused__, size_t size) { PoolAlloc *alloc; if (size > MAX_ALLOC_SIZE) i_panic("Trying to allocate too much memory"); alloc = calloc(sizeof(PoolAlloc) + size, 1); if (alloc == NULL) i_panic("pool_system_malloc(): Out of memory"); alloc->size.size = size; return (char *) alloc + sizeof(PoolAlloc); } static void pool_system_free(Pool pool __attr_unused__, void *mem) { if (mem != NULL) free((char *) mem - sizeof(PoolAlloc)); } static void *pool_system_realloc(Pool pool __attr_unused__, void *mem, size_t size) { PoolAlloc *alloc; size_t old_size; char *rmem; if (mem == NULL) { alloc = NULL; old_size = 0; } else { /* get old size */ alloc = (PoolAlloc *) ((char *) mem - sizeof(PoolAlloc)); old_size = alloc->size.size; } /* alloc & set new size */ alloc = realloc(alloc, sizeof(PoolAlloc) + size); if (alloc == NULL) i_panic("pool_system_realloc(): Out of memory"); alloc->size.size = size; rmem = (char *) alloc + sizeof(PoolAlloc); if (size > old_size) { /* clear new data */ memset(rmem + old_size, 0, size-old_size); } return rmem; } static void *pool_system_realloc_min(Pool pool, void *mem, size_t size) { PoolAlloc *alloc; size_t old_size; if (mem == NULL) old_size = 0; else { /* get old size */ alloc = (PoolAlloc *) ((char *) mem - sizeof(PoolAlloc)); old_size = alloc->size.size; } if (old_size >= size) return mem; else return pool_system_realloc(pool, mem, size); } static void pool_system_clear(Pool pool __attr_unused__) { i_panic("pool_system_clear() must not be called"); }