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* gc.c (vm_xrealloc): add a few comment why we avoid realloc(ptr,0).

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38696 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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kosaki 2013-01-04 20:05:42 +00:00
parent db58af6051
commit 03f7f9ea40
2 changed files with 11 additions and 0 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
Sat Jan 5 05:04:39 2013 KOSAKI Motohiro <kosaki.motohiro@gmail.com>
* gc.c (vm_xrealloc): add a few comment why we avoid realloc(ptr,0).
Fri Jan 4 20:17:06 2013 Yuki Yugui Sonoda <yugui@yugui.jp> Fri Jan 4 20:17:06 2013 Yuki Yugui Sonoda <yugui@yugui.jp>
* Makefile.in (RBCONFIG): Moved from common.mk in order to use the * Makefile.in (RBCONFIG): Moved from common.mk in order to use the

7
gc.c
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@ -3529,7 +3529,14 @@ vm_xrealloc(rb_objspace_t *objspace, void *ptr, size_t size)
if ((ssize_t)size < 0) { if ((ssize_t)size < 0) {
negative_size_allocation_error("negative re-allocation size"); negative_size_allocation_error("negative re-allocation size");
} }
if (!ptr) return vm_xmalloc(objspace, size); if (!ptr) return vm_xmalloc(objspace, size);
/*
* The behavior of realloc(ptr, 0) is implementation defined.
* Therefore we don't use realloc(ptr, 0) for portability reason.
* see http://www.open-std.org/jtc1/sc22/wg14/www/docs/dr_400.htm
*/
if (size == 0) { if (size == 0) {
vm_xfree(objspace, ptr); vm_xfree(objspace, ptr);
return 0; return 0;