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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1997, 1998
* Sleepycat Software. All rights reserved.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)os_alloc.c 10.10 (Sleepycat) 10/12/98";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#endif
#include "db_int.h"
#include "os_jump.h"
/*
* !!!
* Correct for systems that return NULL when you allocate 0 bytes of memory.
* There are several places in DB where we allocate the number of bytes held
* by the key/data item, and it can be 0. Correct here so that malloc never
* returns a NULL for that reason (which behavior is permitted by ANSI). We
* could make these calls macros on non-Alpha architectures (that's where we
* saw the problem), but it's probably not worth the autoconf complexity.
*
* !!!
* Correct for systems that don't set errno when malloc and friends fail.
*
* Out of memory.
* We wish to hold the whole sky,
* But we never will.
*/
/*
* __os_strdup --
* The strdup(3) function for DB.
*
* PUBLIC: int __os_strdup __P((const char *, void *));
*/
int
__os_strdup(str, storep)
const char *str;
void *storep;
{
size_t size;
int ret;
void *p;
*(void **)storep = NULL;
size = strlen(str) + 1;
if ((ret = __os_malloc(size, NULL, &p)) != 0)
return (ret);
memcpy(p, str, size);
*(void **)storep = p;
return (0);
}
/*
* __os_calloc --
* The calloc(3) function for DB.
*
* PUBLIC: int __os_calloc __P((size_t, size_t, void *));
*/
int
__os_calloc(num, size, storep)
size_t num, size;
void *storep;
{
void *p;
int ret;
size *= num;
if ((ret = __os_malloc(size, NULL, &p)) != 0)
return (ret);
memset(p, 0, size);
*(void **)storep = p;
return (0);
}
/*
* __os_malloc --
* The malloc(3) function for DB.
*
* PUBLIC: int __os_malloc __P((size_t, void *(*)(size_t), void *));
*/
int
__os_malloc(size, db_malloc, storep)
size_t size;
void *(*db_malloc) __P((size_t)), *storep;
{
void *p;
*(void **)storep = NULL;
/* Never allocate 0 bytes -- some C libraries don't like it. */
if (size == 0)
++size;
/* Some C libraries don't correctly set errno when malloc(3) fails. */
errno = 0;
if (db_malloc != NULL)
p = db_malloc(size);
else if (__db_jump.j_malloc != NULL)
p = __db_jump.j_malloc(size);
else
p = malloc(size);
if (p == NULL) {
if (errno == 0)
errno = ENOMEM;
return (errno);
}
#ifdef DIAGNOSTIC
memset(p, 0xdb, size);
#endif
*(void **)storep = p;
return (0);
}
/*
* __os_realloc --
* The realloc(3) function for DB.
*
* PUBLIC: int __os_realloc __P((void *, size_t));
*/
int
__os_realloc(storep, size)
void *storep;
size_t size;
{
void *p, *ptr;
ptr = *(void **)storep;
/* If we haven't yet allocated anything yet, simply call malloc. */
if (ptr == NULL)
return (__os_malloc(size, NULL, storep));
/* Never allocate 0 bytes -- some C libraries don't like it. */
if (size == 0)
++size;
/*
* Some C libraries don't correctly set errno when realloc(3) fails.
*
* Don't overwrite the original pointer, there are places in DB we
* try to continue after realloc fails.
*/
errno = 0;
if (__db_jump.j_realloc != NULL)
p = __db_jump.j_realloc(ptr, size);
else
p = realloc(ptr, size);
if (p == NULL) {
if (errno == 0)
errno = ENOMEM;
return (errno);
}
*(void **)storep = p;
return (0);
}
/*
* __os_free --
* The free(3) function for DB.
*
* PUBLIC: void __os_free __P((void *, size_t));
*/
void
__os_free(ptr, size)
void *ptr;
size_t size;
{
#ifdef DIAGNOSTIC
if (size != 0)
memset(ptr, 0xdb, size);
#endif
if (__db_jump.j_free != NULL)
__db_jump.j_free(ptr);
else
free(ptr);
}
/*
* __os_freestr --
* The free(3) function for DB, freeing a string.
*
* PUBLIC: void __os_freestr __P((void *));
*/
void
__os_freestr(ptr)
void *ptr;
{
#ifdef DIAGNOSTIC
memset(ptr, 0xdb, strlen(ptr) + 1);
#endif
if (__db_jump.j_free != NULL)
__db_jump.j_free(ptr);
else
free(ptr);
}
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