61 lines
2.8 KiB
C
61 lines
2.8 KiB
C
/*-*- 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/str/str.h"
|
|
#include "libc/str/thompike.h"
|
|
#include "libc/str/utf16.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;
|
|
unsigned n;
|
|
uint64_t w;
|
|
wint_t x, y;
|
|
i = 0;
|
|
if (dstsize) {
|
|
for (;;) {
|
|
if (!(x = *src++ & 0xff)) break;
|
|
if (ThomPikeCont(x)) continue;
|
|
if (!isascii(x)) {
|
|
n = ThomPikeLen(x);
|
|
x = ThomPikeByte(x);
|
|
while (--n) {
|
|
if (!(y = *src++ & 0xff)) goto stop;
|
|
x = ThomPikeMerge(x, y);
|
|
}
|
|
}
|
|
w = EncodeUtf16(x);
|
|
while (w && i + 1 < dstsize) {
|
|
dst[i++] = w & 0xFFFF;
|
|
w >>= 16;
|
|
}
|
|
}
|
|
stop:
|
|
dst[i] = 0;
|
|
}
|
|
return i;
|
|
}
|