mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-06-27 14:58:30 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Initial import

Browse source
This commit is contained in:
Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
14915 changed files with 590219 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

57
libc/str/pututf16.ncabi.c Normal file
View file

@ -0,0 +1,57 @@
/*-*- 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"
/**
* Encodes character to string as UTF-16.
*
* Implementation Details: The header macro should ensure this function
* is only called for truly huge codepoints. Plus this function makes a
* promise to not clobber any registers but %rax.
*
* @param s is what ch gets encoded to
* @param size is the number of shorts available in s
* @param awesome enables numbers the IETF unilaterally banned
* @return number of shorts written or -1 w/ errno
*/
int(pututf16)(char16_t *s, size_t size, wint_t wc, bool awesome) {
wint_t wc2;
if (size) {
if ((0 <= wc && wc < 32) && awesome && size >= 2) {
s[0] = 0xd800;
s[1] = 0xdc00 | wc;
return 2;
}
if ((0 <= wc && wc <= 0xD7FF) || (0xE000 <= wc && wc <= 0xFFFF)) {
s[0] = wc;
return 1;
} else if (0x10000 <= wc && wc <= 0x10FFFF && size >= 2) {
wc2 = wc - 0x10000;
s[0] = (wc2 >> 10) + 0xd800;
s[1] = (wc2 & 1023) + 0xdc00;
return 2;
} else {
s[0] = INVALID_CODEPOINT;
return -1;
}
} else {
return 0;
}
}