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utils.c: fix xrealloc

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(based on suggested patch by Jan-Benedict Glaw):
> While hacking mpd, I noticed that an assert()ion in xrealloc is wrong.
> A null size is perfectly legal, so we shouldn't assert on that.

Since some C libraries return NULL when size == 0, we'll make
sure we get a free()-able pointer since some of those C
libraries also barf on free(NULL).

git-svn-id: https://svn.musicpd.org/mpd/trunk@4740 09075e82-0dd4-0310-85a5-a0d7c8717e4f
This commit is contained in:
Eric Wong 2006-09-07 19:26:51 +00:00
parent 12d253118d
commit f5c7f3da31
1 changed files with 6 additions and 5 deletions
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11
src/utils.c
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@ -133,13 +133,14 @@ mpd_malloc void *xmalloc(size_t size)
mpd_malloc void *xrealloc(void *ptr, size_t size)
{
void *ret;
void *ret = realloc(ptr, size);
/* hmm... realloc to 0 isn't uncommon..., is it? this check
* may be too extreme... (eric) */
assert((mpd_likely(size)));
/* some C libraries return NULL when size == 0,
* make sure we get a free()-able pointer (free(NULL)
* doesn't work with all C libraries, either) */
if (mpd_unlikely(!ret && !size))
ret = realloc(ptr, 1);
ret = realloc(ptr, size);
if (mpd_unlikely(!ret))
FATAL("OOM: realloc\n");
return ret;