108 lines
2.0 KiB
C
108 lines
2.0 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1997, 1998
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* Sleepycat Software. All rights reserved.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)os_alloc.c 10.6 (Sleepycat) 5/2/98";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <string.h>
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#endif
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#include "db_int.h"
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/*
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* __db_strdup --
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* The strdup(3) function for DB.
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*
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* PUBLIC: char *__db_strdup __P((const char *));
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*/
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char *
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__db_strdup(str)
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const char *str;
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{
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size_t len;
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char *copy;
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len = strlen(str) + 1;
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if ((copy = __db_malloc(len)) == NULL)
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return (NULL);
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memcpy(copy, str, len);
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return (copy);
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}
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/*
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* XXX
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* Correct for systems that return NULL when you allocate 0 bytes of memory.
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* There are several places in DB where we allocate the number of bytes held
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* by the key/data item, and it can be 0. Correct here so that malloc never
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* returns a NULL for that reason (which behavior is permitted by ANSI). We
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* could make these calls macros on non-Alpha architectures (that's where we
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* saw the problem), but it's probably not worth the autoconf complexity.
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*
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* Out of memory.
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* We wish to hold the whole sky,
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* But we never will.
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*/
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/*
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* __db_calloc --
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* The calloc(3) function for DB.
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*
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* PUBLIC: void *__db_calloc __P((size_t, size_t));
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*/
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void *
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__db_calloc(num, size)
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size_t num, size;
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{
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void *p;
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size *= num;
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if ((p = __db_jump.j_malloc(size == 0 ? 1 : size)) != NULL)
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memset(p, 0, size);
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return (p);
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}
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/*
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* __db_malloc --
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* The malloc(3) function for DB.
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*
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* PUBLIC: void *__db_malloc __P((size_t));
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*/
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void *
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__db_malloc(size)
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size_t size;
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{
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#ifdef DIAGNOSTIC
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void *p;
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p = __db_jump.j_malloc(size == 0 ? 1 : size);
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memset(p, 0xff, size == 0 ? 1 : size);
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return (p);
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#else
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return (__db_jump.j_malloc(size == 0 ? 1 : size));
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#endif
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}
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/*
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* __db_realloc --
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* The realloc(3) function for DB.
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*
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* PUBLIC: void *__db_realloc __P((void *, size_t));
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*/
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void *
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__db_realloc(ptr, size)
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void *ptr;
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size_t size;
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{
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return (__db_jump.j_realloc(ptr, size == 0 ? 1 : size));
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}
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