From: Peter Maydell <pmaydell@chiark.greenend.org.uk>
Date: Wed, 21 May 2008 18:05:49 +0000 (+0000)
Subject: Don't rely on realloc() to follow POSIX in handling a NULL pointer
X-Git-Tag: PRE_POSIX_CONVERSION~60
X-Git-Url: http://git.marmaro.de/?p=mmh;a=commitdiff_plain;h=b84d8f3a2a435ecad9b75900a9f31445fb71e187

Don't rely on realloc() to follow POSIX in handling a NULL pointer
---

diff --git a/ChangeLog b/ChangeLog
index 8da5111..a3eff81 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2008-05-21  Peter Maydell  <pmaydell@chiark.greenend.org.uk>
 
+	* sbr/utils.c (mh_xrealloc): don't assume realloc() can
+	handle NULL pointers; some non-POSIX realloc()s can't.
+
 	* sbr/dtimep.lex: add some table size declarations for the
 	benefit of elderly lexes with small defaults.
 
diff --git a/sbr/utils.c b/sbr/utils.c
index d822995..7c4ddcf 100644
--- a/sbr/utils.c
+++ b/sbr/utils.c
@@ -47,6 +47,10 @@ mh_xrealloc(void *ptr, size_t size)
 {
     void *memory;
 
+    /* Some non-POSIX realloc()s don't cope with realloc(NULL,sz) */
+    if (!ptr)
+        return mh_xmalloc(size);
+
     if (size == 0)
         adios(NULL, "Tried to realloc 0bytes");