Curl_gmtime: added a portable gmtime

Instead of polluting many places with #ifdefs, we create a single place
for this function, and also check return code properly so that a NULL
pointer returned won't cause problems.

lib/file.c

@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -487,14 +487,13 @@ static CURLcode file_do(struct connectdata *conn, bool *done)
       return result;
 
     if(fstated) {
-      const struct tm *tm;
       time_t filetime = (time_t)statbuf.st_mtime;
-#ifdef HAVE_GMTIME_R
       struct tm buffer;
-      tm = (const struct tm *)gmtime_r(&filetime, &buffer);
-#else
-      tm = gmtime(&filetime);
-#endif
+      const struct tm *tm = &buffer;
+      result = Curl_gmtime(filetime, &buffer);
+      if(result)
+        return result;
+
       /* format: "Tue, 15 Nov 1994 12:45:26 GMT" */
       snprintf(buf, BUFSIZE-1,
                "Last-Modified: %s, %02d %s %4d %02d:%02d:%02d GMT\r\n",

lib/ftp.c

@@ -1841,14 +1841,14 @@ static CURLcode ftp_state_mdtm_resp(struct connectdata *conn,
          ftpc->file &&
          data->set.get_filetime &&
          (data->info.filetime>=0) ) {
-        struct tm *tm;
         time_t filetime = (time_t)data->info.filetime;
-#ifdef HAVE_GMTIME_R
         struct tm buffer;
-        tm = (struct tm *)gmtime_r(&filetime, &buffer);
-#else
-        tm = gmtime(&filetime);
-#endif
+        const struct tm *tm = &buffer;
+
+        result = Curl_gmtime(filetime, &buffer);
+        if(result)
+          return result;
+
         /* format: "Tue, 15 Nov 1994 12:45:26" */
         snprintf(buf, BUFSIZE-1,
                  "Last-Modified: %s, %02d %s %4d %02d:%02d:%02d GMT\r\n",

lib/gtls.c

@@ -170,13 +170,12 @@ static void showtime(struct SessionHandle *data,
                      const char *text,
                      time_t stamp)
 {
-  struct tm *tm;
-#ifdef HAVE_GMTIME_R
   struct tm buffer;
-  tm = (struct tm *)gmtime_r(&stamp, &buffer);
-#else
-  tm = gmtime(&stamp);
-#endif
+  const struct tm *tm = &buffer;
+  CURLcode result = Curl_gmtime(stamp, &buffer);
+  if(result)
+    return;
+
   snprintf(data->state.buffer,
            BUFSIZE,
            "\t %s: %s, %02d %s %4d %02d:%02d:%02d GMT\n",

lib/http.c

@@ -2052,9 +2052,17 @@ CURLcode Curl_add_custom_headers(struct connectdata *conn,
 CURLcode Curl_add_timecondition(struct SessionHandle *data,
                                 Curl_send_buffer *req_buffer)
 {
-  struct tm *tm;
+  const struct tm *tm;
   char *buf = data->state.buffer;
   CURLcode result = CURLE_OK;
+  struct tm keeptime;
+
+  result = Curl_gmtime(data->set.timevalue, &keeptime);
+  if(result) {
+    failf(data, "Invalid TIMEVALUE\n");
+    return result;
+  }
+  tm = &keeptime;
 
   /* The If-Modified-Since header family should have their times set in
    * GMT as RFC2616 defines: "All HTTP date/time stamps MUST be
@@ -2063,14 +2071,6 @@ CURLcode Curl_add_timecondition(struct SessionHandle *data,
    * Time)." (see page 20 of RFC2616).
    */
 
-#ifdef HAVE_GMTIME_R
-  /* thread-safe version */
-  struct tm keeptime;
-  tm = (struct tm *)gmtime_r(&data->set.timevalue, &keeptime);
-#else
-  tm = gmtime(&data->set.timevalue);
-#endif
-
   /* format: "Tue, 15 Nov 1994 12:45:26 GMT" */
   snprintf(buf, BUFSIZE-1,
            "%s, %02d %s %4d %02d:%02d:%02d GMT",
@@ -2654,7 +2654,7 @@ CURLcode Curl_http(struct connectdata *conn, bool *done)
 #endif
 
   if(data->set.timecondition) {
-      result = Curl_add_timecondition(data, req_buffer);
+    result = Curl_add_timecondition(data, req_buffer);
     if(result)
       return result;
   }

lib/parsedate.c

@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -514,3 +514,20 @@ time_t curl_getdate(const char *p, const time_t *now)
   /* everything else is fail */
   return -1;
 }
+
+CURLcode Curl_gmtime(time_t intime, struct tm *store)
+{
+  const struct tm *tm;
+#ifdef HAVE_GMTIME_R
+  /* thread-safe version */
+  tm = (struct tm *)(gmtime_r)(&intime, store);
+#else
+  tm = (gmtime)(&intime);
+  if(tm)
+    *store = *tm; /* copy the pointed struct to the local copy */
+#endif
+
+  if(!tm)
+    return CURLE_BAD_FUNCTION_ARGUMENT;
+  return CURLE_OK;
+}

lib/parsedate.h

@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -43,4 +43,6 @@ int Curl_parsedate(const char *date, time_t *output);
 #define PARSEDATE_LATER  1
 #define PARSEDATE_SOONER 2
 
+CURLcode Curl_gmtime(time_t intime, struct tm *store);
+
 #endif