Fix return value from doprnt when message is truncated at non-ASCII character.

 src/doprnt.c (doprnt): Don't return value smaller than the buffer
 size if the message was truncated.  (Bug#8545).

2 files changed, 8 insertions, 1 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 91777751853..107d6f0073a 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2011-04-28  Eli Zaretskii  <eliz@gnu.org>
+
+        * doprnt.c (doprnt): Don't return value smaller than the buffer
+        size if the message was truncated.  (Bug#8545).
+
 2011-04-28  Juanma Barranquero  <lekktu@gmail.com>
 
         * w32fns.c (Fx_change_window_property, Fx_delete_window_property)
diff --git a/src/doprnt.c b/src/doprnt.c
index a6becc7454f..63dba9f5850 100644
--- a/src/doprnt.c
+++ b/src/doprnt.c
@@ -403,7 +403,9 @@ doprnt (char *buffer, register size_t bufsize, const char *format,
         while (fmt < format_end && --bufsize > 0 && !CHAR_HEAD_P (*fmt));
         if (!CHAR_HEAD_P (*fmt))
           {
-            bufptr = save_bufptr;
+            /* Truncate, but return value that will signal to caller
+               that the buffer was too small.  */
+            *save_bufptr = 0;
             break;
           }
       }