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/*
* 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 <err.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
int
mbsavis(char** outp, const char *mbs)
{
const char *src; /* Iterate mbs. */
char *dst; /* Iterate *outp. */
wchar_t wc;
int total_width; /* Display width of the whole string. */
int width; /* Display width of a single Unicode char. */
int len; /* Length in bytes of UTF-8 encoded string. */
len = strlen(mbs);
if ((*outp = malloc(len + 1)) == NULL)
err(1, NULL);
if (MB_CUR_MAX == 1) {
memcpy(*outp, mbs, len + 1);
return len;
}
src = mbs;
dst = *outp;
total_width = 0;
while (*src != '\0') {
if ((len = mbtowc(&wc, src, MB_CUR_MAX)) == -1) {
total_width++;
*dst++ = '?';
src++;
} else if ((width = wcwidth(wc)) == -1) {
total_width++;
*dst++ = '?';
src += len;
} else {
total_width += width;
while (len-- > 0)
*dst++ = *src++;
}
}
*dst = '\0';
return total_width;
}
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