Prevent failf() from using the va_list variable more than once.

See bug report #1088962 and  Single Unix Specification:
http://www.opengroup.org/onlinepubs/007908799/xsh/vfprintf.html

1 files changed, 11 insertions, 11 deletions

diff --git a/lib/sendf.c b/lib/sendf.c
index 175323903..91671b95e 100644
--- a/lib/sendf.c
+++ b/lib/sendf.c
@@ -155,21 +155,21 @@ void Curl_failf(struct SessionHandle *data, const char *fmt, ...)
 {
   va_list ap;
   va_start(ap, fmt);
+  size_t len;
+
+  vsnprintf(data->state.buffer, BUFSIZE, fmt, ap);
+
   if(data->set.errorbuffer && !data->state.errorbuf) {
-    vsnprintf(data->set.errorbuffer, CURL_ERROR_SIZE, fmt, ap);
+    snprintf(data->set.errorbuffer, CURL_ERROR_SIZE, "%s", data->state.buffer);
     data->state.errorbuf = TRUE; /* wrote error string */
   }
   if(data->set.verbose) {
-      size_t len;
-
-      vsnprintf(data->state.buffer, BUFSIZE, fmt, ap);
-      len = strlen(data->state.buffer);
-
-      if(len < BUFSIZE - 1) {
-        data->state.buffer[len] = '\n';
-        data->state.buffer[++len] = '\0';
-      }
-      Curl_debug(data, CURLINFO_TEXT, data->state.buffer, len, NULL);
+    len = strlen(data->state.buffer);
+    if(len < BUFSIZE - 1) {
+      data->state.buffer[len] = '\n';
+      data->state.buffer[++len] = '\0';
+    }
+    Curl_debug(data, CURLINFO_TEXT, data->state.buffer, len, NULL);
   }
 
   va_end(ap);