bug of gawk cvs version (builtin.c)

[Hirofumi Saito]

Hello.

I checked out the latest cvs version of gawk from savannah at
2008-03-08.

But printf() function formatted by "%c" is something strange in my
Fedora8 (ja_JP.UTF-8).

(1) gawk 'BEGIN{printf "%c\n",  65}'

This code is same as a sample code of gawk.info.
But the result is "gawk: builtin.c:1177: format_tree: Assertion `cp ==
arg->sub.val.sp'".


(2) gawk 'BEGIN{printf "%c\n", "AA"}'

The result is "AA".
The expected answer is just "A".

The simple patch for this bug is provided by Koichi Kimura.

--- builtin.c.orig      2008-03-07 04:50:40.000000000 +0900
+++ builtin.c   2008-03-09 02:14:09.562500000 +0900
@@ -1175,7 +1195,8 @@ check_pos:
                        copy_count = prec;
                        if (gawk_mb_cur_max > 1 && (cs1 == 's' || cs1 == 'c')) {
                                assert(cp == arg->stptr);
-                               copy_count = mbc_byte_count(arg->stptr, 
arg->stlen);
+                               copy_count = mbc_byte_count(arg->stptr,
+                                                            cs1=='s' ? 
arg->stlen : 1);
                        }
                        bchunk(cp, copy_count);
                        while (fw > prec) {

After applying this patch, it goes well and Japanese charactors are
processed correctly too.

Regards,

Hirofumi.