wasapi: audio capture client module (fixes #7205)

[vlc] / compat / vasprintf.c

diff --git a/compat/vasprintf.c b/compat/vasprintf.c
index 17b6d671f268ce89f1739fea22cb683f1a74640c..37d72d5da51c89fa747c37d15f18e7754d4beb4b 100644 (file)
--- a/compat/vasprintf.c
+++ b/compat/vasprintf.c
@@ -10,7 +10,7 @@
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public License
@@ -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, args);
+        assert (len2 == len);
+        va_end (args);
+    }
+    else
+    {
+        len = -1;
+#ifndef NDEBUG
+        str = (void *)(intptr_t)0x41414141; /* poison */
+#endif
+    }
+    *strp = str;
+    return len;
 }