avoid error when the user has requested many extra headers via IMAP

closes #3435

1 files changed, 26 insertions, 20 deletions

diff --git a/imap/message.c b/imap/message.c
index 91847913..1f0f3c02 100644
--- a/imap/message.c
+++ b/imap/message.c
@@ -62,7 +62,7 @@ int imap_read_headers (IMAP_DATA* idata, int msgbegin, int msgend)
 {
   CONTEXT* ctx;
   char buf[LONG_STRING];
-  char hdrreq[STRING];
+  char *hdrreq = NULL;
   FILE *fp;
   char tempfile[_POSIX_PATH_MAX];
   int msgno, idx;
@@ -73,6 +73,7 @@ int imap_read_headers (IMAP_DATA* idata, int msgbegin, int msgend)
   int maxuid = 0;
   const char *want_headers = "DATE FROM SUBJECT TO CC MESSAGE-ID REFERENCES CONTENT-TYPE CONTENT-DESCRIPTION IN-REPLY-TO REPLY-TO LINES LIST-POST X-LABEL";
   progress_t progress;
+  int retval = -1;
 
 #if USE_HCACHE
   unsigned int *uid_validity = NULL;
@@ -85,19 +86,19 @@ int imap_read_headers (IMAP_DATA* idata, int msgbegin, int msgend)
 
   if (mutt_bit_isset (idata->capabilities,IMAP4REV1))
   {
-    snprintf (hdrreq, sizeof (hdrreq), "BODY.PEEK[HEADER.FIELDS (%s%s%s)]",
-	      want_headers, ImapHeaders ? " " : "", ImapHeaders ? ImapHeaders : "");
+    hdrreq = mutt_sprintf ("BODY.PEEK[HEADER.FIELDS (%s%s%s)]",
+                           want_headers, ImapHeaders ? " " : "", NONULL (ImapHeaders));
   }
   else if (mutt_bit_isset (idata->capabilities,IMAP4))
   {
-    snprintf (hdrreq, sizeof (hdrreq), "RFC822.HEADER.LINES (%s%s%s)",
-	      want_headers, ImapHeaders ? " " : "", ImapHeaders ? ImapHeaders : "");
+    hdrreq = mutt_sprintf ("RFC822.HEADER.LINES (%s%s%s)",
+                           want_headers, ImapHeaders ? " " : "", NONULL (ImapHeaders));
   }
   else
   {	/* Unable to fetch headers for lower versions */
     mutt_error _("Unable to fetch headers from this IMAP server version.");
     mutt_sleep (2);	/* pause a moment to let the user see the error */
-    return -1;
+    goto error_out_0;
   }
 
   /* instead of downloading all headers and then parsing them, we parse them
@@ -107,7 +108,7 @@ int imap_read_headers (IMAP_DATA* idata, int msgbegin, int msgend)
   {
     mutt_error (_("Could not create temporary file %s"), tempfile);
     mutt_sleep (2);
-    return -1;
+    goto error_out_0;
   }
   unlink (tempfile);
 
@@ -220,8 +221,7 @@ int imap_read_headers (IMAP_DATA* idata, int msgbegin, int msgend)
         if (h.data)
           imap_free_header_data ((void**) (void*) &h.data);
         imap_hcache_close (idata);
-        safe_fclose (&fp);
-        return -1;
+	goto error_out_1;
       }
     }
     /* could also look for first null header in case hcache is holey */
@@ -239,13 +239,13 @@ int imap_read_headers (IMAP_DATA* idata, int msgbegin, int msgend)
     /* we may get notification of new mail while fetching headers */
     if (msgno + 1 > fetchlast)
     {
-      fetchlast = msgend + 1;
+      char *cmd;
 
-      snprintf (buf, sizeof (buf),
-        "FETCH %d:%d (UID FLAGS INTERNALDATE RFC822.SIZE %s)", msgno + 1,
-        fetchlast, hdrreq);
-
-      imap_cmd_start (idata, buf);
+      fetchlast = msgend + 1;
+      cmd = mutt_sprintf ("FETCH %d:%d (UID FLAGS INTERNALDATE RFC822.SIZE %s)",
+                          msgno + 1, fetchlast, hdrreq);
+      imap_cmd_start (idata, cmd);
+      FREE (&cmd);
     }
 
     rewind (fp);
@@ -338,8 +338,7 @@ int imap_read_headers (IMAP_DATA* idata, int msgbegin, int msgend)
 #if USE_HCACHE
       imap_hcache_close (idata);
 #endif
-      safe_fclose (&fp);
-      return -1;
+      goto error_out_1;
     }
 
     /* in case we get new mail while fetching the headers */
@@ -371,8 +370,6 @@ int imap_read_headers (IMAP_DATA* idata, int msgbegin, int msgend)
   imap_hcache_close (idata);
 #endif /* USE_HCACHE */
 
-  safe_fclose (&fp);
-
   if (ctx->msgcount > oldmsgcount)
   {
     mx_alloc_memory(ctx);
@@ -380,7 +377,16 @@ int imap_read_headers (IMAP_DATA* idata, int msgbegin, int msgend)
   }
 
   idata->reopen |= IMAP_REOPEN_ALLOW;
-  return msgend;
+
+  retval = msgend;
+
+error_out_1:
+  safe_fclose (&fp);
+
+error_out_0:
+  FREE (&hdrreq);
+
+  return retval;
 }
 
 int imap_fetch_message (MESSAGE *msg, CONTEXT *ctx, int msgno)