Message-Id: <m0xsTYR-000C4dC@sloep111.cs.vu.nl>
Date:     Wed, 14 Jan 98 15:12:27 MET
From: Michel de Ruiter  <mdruiter AT cs DOT vu DOT nl>
To: dj AT delorie DOT com
cc: djgpp-workers AT delorie DOT com
Subject:  Bug in new `free' and `realloc'?
Precedence: bulk

DJ,

According to the documentation (libc.inf),
`free(NULL);' should do nothing. But, with
DJGPP V2.02 alpha 980101 it crashes. Also,
realloc needs special treatment for `NULL'.
I noticed many programs/libs rely on this
behaviour (Allegro, LWP, etc).

I know, `malloc()', `free()' and `realloc()'
are new. Just thought I'd let you know.

I suggest (don't take this too seriously,
I'm not an expert on this) this diff:

*** malloc.c	Fri Jan  2 01:04:46 1998
--- mdrmallo.c	Sun Jan 11 22:59:52 1998
***************
*** 278,284 ****
  {
    int b;
    BLOCK *block = (BLOCK *)((char *)ptr-4);
! 
  #if NUMSMALL
    if (block->size < SMALL)
    {
--- 278,285 ----
  {
    int b;
    BLOCK *block = (BLOCK *)((char *)ptr-4);
!   if (ptr == NULL)
!     return;
  #if NUMSMALL
    if (block->size < SMALL)
    {
***************
*** 324,330 ****
  {
    BLOCK *b = (BLOCK *)((char *)ptr-4);
    char *newptr;
!   int copysize = b->size;
    if (size <= b->size)
    {
  #if 0
--- 325,334 ----
  {
    BLOCK *b = (BLOCK *)((char *)ptr-4);
    char *newptr;
!   int copysize;
!   if (ptr == NULL)
!     return (char *)malloc(size);
!   copysize = b->size;
    if (size <= b->size)
    {
  #if 0

--
Groeten, Michel.        http://www.cs.vu.nl/~mdruiter
 \----/==\----/
  \  /    \  /          "You know, Beavis, you need things that suck,
   \/      \/           to have things that are cool", Butt-Head.