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FreeBSD/Linux Kernel Cross Reference
sys/stdlib/reallocf.c

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    1 /*-
    2  * Copyright (c) 1998, M. Warner Losh <imp@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: stable/8/lib/libc/stdlib/reallocf.c 210745 2010-08-02 09:13:09Z jh $");
   29 
   30 #include <stdlib.h>
   31 
   32 void *
   33 reallocf(void *ptr, size_t size)
   34 {
   35         void *nptr;
   36 
   37         nptr = realloc(ptr, size);
   38 
   39         /*
   40          * When the System V compatibility option (malloc "V" flag) is
   41          * in effect, realloc(ptr, 0) frees the memory and returns NULL.
   42          * So, to avoid double free, call free() only when size != 0.
   43          * realloc(ptr, 0) can't fail when ptr != NULL.
   44          */
   45         if (!nptr && ptr && size != 0)
   46                 free(ptr);
   47         return (nptr);
   48 }

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