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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/str/tprecode8to16.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/conv/conv.h"
#include "libc/str/str.h"
/**
* Transcodes UTF-8 to UTF-16.
*
* @param dst is output buffer
* @param dstsize is shorts in dst
* @param src is NUL-terminated UTF-8 input string
* @return number of shorts written excluding NUL
*/
size_t tprecode8to16(char16_t *dst, size_t dstsize, const char *src) {
size_t i = 0;
if (dstsize) {
for (;;) {
wint_t wc;
src += abs(tpdecode(src, &wc));
if (!wc || dstsize == 1) {
dst[i] = u'\0';
break;
}
size_t got = abs(pututf16(&dst[i], dstsize, wc, false));
dstsize -= got;
i += got;
}
}
return i;
}