Handle calloc(0,x) where different from malloc.

Configure assumes that if malloc(0) returns null then calloc(0,n)
also does.  On some old platforms (SunOS4) malloc behaves as expected
(as determined by AC_FUNC_MALLOC) but calloc doesn't.  Test for this
at configure time and activate the replacement function if found, plus
handle this case in rpl_calloc.

1 files changed, 2 insertions, 0 deletions

diff --git a/openbsd-compat/bsd-malloc.c b/openbsd-compat/bsd-malloc.c
index 6402ab588..482facdc9 100644
--- a/openbsd-compat/bsd-malloc.c
+++ b/openbsd-compat/bsd-malloc.c
@@ -50,6 +50,8 @@ rpl_realloc(void *ptr, size_t size)
 {
         if (size == 0)
                 size = 1;
+        if (ptr == 0)
+                return malloc(size);
         return realloc(ptr, size);
 }
 #endif