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/* $OpenBSD: utf8.c,v 1.1 2016/01/10 14:04:16 schwarze Exp $ */
/*
* Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* witH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <vis.h>
#include <wchar.h>
int
mbswprint(const char *mbs, int maxwidth, int trail)
{
char buf[5];
wchar_t wc;
int len; /* length in bytes of UTF-8 encoded string */
int width; /* display width of a single Unicode char */
int total_width; /* display width of what is printed */
total_width = 0;
while (*mbs != '\0' && total_width < maxwidth) {
len = mbtowc(&wc, mbs, MB_CUR_MAX);
if (len == -1) {
(void)mbtowc(NULL, NULL, MB_CUR_MAX);
len = 1;
}
if (len == 1)
width = vis(buf, mbs[0],
VIS_TAB | VIS_NL | VIS_CSTYLE, mbs[1]) - buf;
else if ((width = wcwidth(wc)) == -1) {
/* U+FFFD replacement character */
memcpy(buf, "\357\277\275\0", 4);
width = 1;
} else {
memcpy(buf, mbs, len);
buf[len] = '\0';
}
if (total_width + width > maxwidth)
break;
fputs(buf, stdout);
total_width += width;
mbs += len;
}
if (trail)
while (total_width++ < maxwidth)
putchar(' ');
return total_width;
}
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