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__slk_set_finalise - fix length vs. width confusion

This commit is contained in:
uwe 2019-07-28 00:51:59 +00:00
parent 96ffe7929a
commit 4753bc1e70
1 changed files with 23 additions and 13 deletions
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36
lib/libcurses/slk.c
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@ -1,4 +1,4 @@
/* $NetBSD: slk.c,v 1.7 2019/07/28 00:15:38 uwe Exp $ */
/* $NetBSD: slk.c,v 1.8 2019/07/28 00:51:59 uwe Exp $ */
/*-
* Copyright (c) 2017 The NetBSD Foundation, Inc.
@ -31,7 +31,7 @@
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: slk.c,v 1.7 2019/07/28 00:15:38 uwe Exp $");
__RCSID("$NetBSD: slk.c,v 1.8 2019/07/28 00:51:59 uwe Exp $");
#endif /* not lint */
#include <ctype.h>
@ -719,7 +719,7 @@ static int
__slk_set_finalise(SCREEN *screen, int labnum)
{
struct __slk_label *l;
size_t spc, len, x;
size_t spc, len, width, x;
char *p;
l = &screen->slk_labels[labnum];
@ -727,24 +727,34 @@ __slk_set_finalise(SCREEN *screen, int labnum)
#ifdef HAVE_WCHAR
len = 0;
width = 0;
if (l->text != NULL) {
wchar_t wc;
size_t plen;
p = l->text;
plen = strlen(l->text);
while (*p != '\0') {
if ((x = mbrtowc(0, p, strlen(p), &screen->sp)) == -1)
size_t mblen;
wchar_t wc;
int w;
mblen = mbrtowc(&wc, p, plen, &screen->sp);
if ((ssize_t)mblen < 0)
return ERR;
mbrtowc(&wc, p, x, &screen->sp);
if (len + wcwidth(wc) > spc)
w = wcwidth(wc);
if (width + w > spc)
break;
len += wcwidth(wc);
p += x;
width += w;
len += mblen;
p += mblen;
plen -= mblen;
}
}
#else
len = l->text == NULL ? 0 : strlen(l->text);
if (len > spc)
len = spc;
width = len;
#endif
switch(l->justify) {
@ -752,12 +762,12 @@ __slk_set_finalise(SCREEN *screen, int labnum)
x = 0;
break;
case SLK_JUSTIFY_CENTER:
x = (spc - len) / 2;
if (x + len > spc)
x = (spc - width) / 2;
if (x + width > spc)
x--;
break;
case SLK_JUSTIFY_RIGHT:
x = spc - len;
x = spc - width;
break;
default:
return ERR; /* impossible */
@ -772,7 +782,7 @@ __slk_set_finalise(SCREEN *screen, int labnum)
if (len != 0) {
memcpy(p, l->text, len);
p += len;
spc -= len;
spc -= width;
}
if (spc != 0) {
memset(p, ' ', spc);