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List:       freebsd-bugs
Subject:    bin/28552: EUC support of wcstombs(3) is broken for codeset 3 and 4
From:       sa2c () and ! or ! jp
Date:       2001-06-30 20:14:48
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> Number:         28552
> Category:       bin
> Synopsis:       EUC support of wcstombs(3) is broken for codeset 3 and 4
> Confidential:   no
> Severity:       serious
> Priority:       medium
> Responsible:    freebsd-bugs
> State:          open
> Quarter:        
> Keywords:       
> Date-Required:
> Class:          sw-bug
> Submitter-Id:   current-users
> Arrival-Date:   Sat Jun 30 13:20:01 PDT 2001
> Closed-Date:
> Last-Modified:
> Originator:     NIIMI Satoshi
> Release:        FreeBSD 4.3-STABLE i386
> Organization:
> Environment:
System: FreeBSD berkeley.us.and.or.jp 4.3-STABLE FreeBSD 4.3-STABLE #2: Thu Jun 21 \
18:28:33 JST 2001     sa2c@berkeley.us.and.or.jp:/usr/obj/usr/src/sys/BERKELEY  i386

	
> Description:

wcstombs(3) converts wide characters to multibyte characters
incorrectly if the character is codeset 3 or codeset 4 of EUC
character.  The produced multibyte characters do not conform to EUC
specifition.

	
> How-To-Repeat:

#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* multibyte Japanese EUC characters */
const unsigned char teststr[] = { 0x41, 0xa4, 0xa2, 0x8e, 0xb1,
	0x8f, 0xb0, 0xa1, 0 };

/* expected wide characters of above */
const wchar_t w_teststr[] = { 0x0041, 0xa4a2, 0x00b1, 0xb021, 0 };

void
dumpmbs(const char *prompt, const unsigned char *p)
{
	int c;

	printf("%s: ", prompt);
	do {
		c = *p++;
		printf("[%02x]", c);
	} while (c != 0);
	putchar('\n');
}

void
dumpwcs(const char *prompt, const wchar_t *wp)
{
	wchar_t wc;

	printf("%s: ", prompt);
	do {
		wc = *wp++;
		printf("[%04x]", wc);
	} while (wc != 0);
	putchar('\n');
}
	
int
main(int argc, char **argv)
{
	unsigned char buf[BUFSIZ];
	wchar_t wbuf[BUFSIZ];

	setlocale(LC_CTYPE, "ja_JP.EUC");

	strncpy(buf, teststr, sizeof(buf) - 1);
	buf[sizeof(buf) - 1] = '\0';
	
	dumpmbs("mbs", teststr);
	dumpwcs("wcs", w_teststr);

	mbstowcs(wbuf, teststr, BUFSIZ);
	dumpwcs("mbs->wcs", wbuf);

	wcstombs(buf, w_teststr, BUFSIZ);
	dumpmbs("wcs->mbs", buf);

	mbstowcs(wbuf, teststr, BUFSIZ);
	wcstombs(buf, wbuf, BUFSIZ);
	dumpmbs("mbs->wcs->mbs", buf);

	wcstombs(buf, w_teststr, BUFSIZ);
	mbstowcs(wbuf, buf, BUFSIZ);
	dumpwcs("wcs->mbs->wcs", wbuf);

	return 0;
}

	
> Fix:

Index: euc.c
===================================================================
RCS file: /home/ncvs/src/lib/libc/locale/euc.c,v
retrieving revision 1.3.6.1
diff -u -u -r1.3.6.1 euc.c
--- euc.c	2000/06/04 21:47:39	1.3.6.1
+++ euc.c	2001/06/30 19:47:16
@@ -123,6 +123,8 @@
 #define	_SS2	0x008e
 #define	_SS3	0x008f
 
+#define GR_BITS	0x80808080 /* XXX: to be fixed */
+
 static inline int
 _euc_set(c)
 	u_int c;
@@ -202,6 +204,8 @@
 				}
 				*string++ = _SS2;
 				--i;
+				/* SS2 designates G2 into GR */
+				nm |= GR_BITS;
 			} else
 				if (m == CEI->bits[3]) {
 					i = len = CEI->count[3];
@@ -212,6 +216,8 @@
 					}
 					*string++ = _SS3;
 					--i;
+					/* SS3 designates G3 into GR */
+					nm |= GR_BITS;
 				} else
 					goto CodeSet1;	/* Bletch */
 		while (i-- > 0)

	
> Release-Note:
> Audit-Trail:
> Unformatted:
  <synopsis of the problem (one line)>

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