out of memory while allocating 0 bytes

[Dmitri]

On Sun, 2002-09-15 at 02:45, Werner Koch wrote:

> On Sun, 15 Sep 2002 03:13:41 +0900 (JST), Yamagata Yoriyuki said:
> 
> > when m_alloc is called with the argument n = 0.  Since malloc in this
> > system returns NULL for the request of 0-byte allocation, this causes
> 
> This is known.  The quick fix is to change it in util/memory.c:
> 
> void *
> FNAME(alloc)( size_t n FNAMEPRT )
> ...
>   #else
>     /* mallocing zero bytes is undefined by ISO-C, so we better make
>        sure that it won't happen */
>     if (!n)
>       n = 1;
>     if( !(p = malloc( n )) )
> 	out_of_core(n,0);

Quite often another, smaller, workaround is used:

    if( !(p = malloc( n+1 )) )
	out_of_core(n,0);

Dmitri

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