Fix bug in `format' (Bug#5710).

* editfns.c (Fformat): Account for string precision when computing
field width (Bug#5710).

2 files changed, 9 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 37a4cdb1b10..da4e336b0ae 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2010-03-13  Andreas Politz  <politza@fh-trier.de>  (tiny change)
+
+        * editfns.c (Fformat): Account for string precision when computing
+        field width (Bug#5710).
+
 2010-03-12  Chong Yidong  <cyd@stupidchicken.com>
 
         * xfns.c (Fx_create_frame): Set default to Qright.
diff --git a/src/editfns.c b/src/editfns.c
index 093f141bff2..9f30ea06411 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -3782,7 +3782,11 @@ usage: (format STRING &rest OBJECTS)  */)
                to be as large as is calculated here.  Easy check for
                the case PRECISION = 0. */
             thissize = precision[n] ? CONVERTED_BYTE_SIZE (multibyte, args[n]) : 0;
+            /* The precision also constrains how much of the argument
+               string will finally appear (Bug#5710). */
             actual_width = lisp_string_width (args[n], -1, NULL, NULL);
+            if (precision[n] != -1)
+              actual_width = min(actual_width,precision[n]);
           }
         /* Would get MPV otherwise, since Lisp_Int's `point' to low memory.  */
         else if (INTEGERP (args[n]) && *format != 's')