[vlc-commits] vasprintf: rewrite. va_copy() was missing.

[Rémi Denis-Courmont]

vlc | branch: master | Rémi Denis-Courmont <remi at remlab.net> | Wed Oct 26 21:11:12 2011 +0300| [59d3977bf0c30ceb2c8cd431c8e0e55de7ff3a93] | committer: Rémi Denis-Courmont

vasprintf: rewrite. va_copy() was missing.

> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=59d3977bf0c30ceb2c8cd431c8e0e55de7ff3a93
---

 compat/vasprintf.c |   33 +++++++++++++++++++++++++++------
 1 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/compat/vasprintf.c b/compat/vasprintf.c
index 17b6d67..f2ab6da 100644
--- a/compat/vasprintf.c
+++ b/compat/vasprintf.c
@@ -25,13 +25,34 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
+#include <assert.h>
 
 int vasprintf (char **strp, const char *fmt, va_list ap)
 {
-    ssize_t len = vsnprintf (NULL, 0, fmt, ap) + 1;
-    char *res = malloc (len);
-    if (res == NULL)
-        return -1;
-    *strp = res;
-    return vsnprintf (res, len, fmt, ap);
+    va_list args;
+    int len;
+
+    va_copy (args, ap);
+    len = vsnprintf (NULL, 0, fmt, args);
+    va_end (args);
+
+    char *str = malloc (len + 1);
+    if (str != NULL)
+    {
+        int len2;
+
+        va_copy (args, ap);
+        len2 = vsprintf (str, fmt, ap);
+        assert (len2 == len);
+        va_end (args);
+    }
+    else
+    {
+        len = -1;
+#ifndef NDEBUG
+        str = (void *)(intptr_t)0x41414141; /* poison */
+#endif
+    }
+    *strp = str;
+    return len;
 }