Date: Fri, 2 Apr 1999 23:21:25 +0800 (CST) From: Yung-Jen Hung <winard@u3717a.dorm.ccu.edu.tw> To: FreeBSD-gnats-submit@freebsd.org Subject: misc/10918: Big5 rune function in libc Message-ID: <199904021521.XAA01537@u3717a.dorm.ccu.edu.tw>
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>Number: 10918
>Category: misc
>Synopsis: _BIG5_sgetrune() in libc doesn't work well
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Apr 2 07:30:01 PST 1999
>Closed-Date:
>Last-Modified:
>Originator: Yung-Jen Hung
>Release: FreeBSD 3.1-STABLE i386
>Organization:
Department of Computer Science and Information Engineering,
National Chung Cheng University, Taiwan
>Environment:
None.
>Description:
the function _BIG5_sgetrune() in /usr/src/lib/libc/locale/big5.c
is wrong,
as a result it can't convert Big5 multi-byte words into
wide-character correctly.
>How-To-Repeat:
the following program should output 72 75 6e 65 b4fa b8d5,
but a segmentation fault occurs now.
before run this program, set the environment variable LD_PRELOAD
to /usr/lib/libxpg4.so.2 first.
/* a program convert characters into rune */
#include <rune.h>
#include <stdio.h>
int main(void)
{
setrunelocale("zh_TW.BIG5");
const char* src = "rune\xb4\xfa\xb8\xd5";
const char* ld = src;
rune_t rune[256];
int num = 0;
while( ( rune[num] = sgetrune( ld, 3, &ld ) ) != 0 )
num ++;
for( int c = 0; c < num; c ++ )
printf( " %02x", rune[c] );
putchar('\n');
}
>Fix:
change these five lines in big5.c line #85:
while (len-- >= 0)
rune = (rune << 8) | ((u_int)(*string++) & 0xff);
if (result)
*result = string + len;
return rune;
to these correct codes:
while (--len >= 0)
rune = (rune << 8) | ((u_int)(*string++) & 0xff);
if (result)
*result = string;
return rune;
>Release-Note:
>Audit-Trail:
>Unformatted:
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