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/* special.c
* Copyright (c) 2011, Peter Ohler
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* - Neither the name of Peter Ohler nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "special.h"
/*
u0000..u007F 00000000000000xxxxxxx 0xxxxxxx
u0080..u07FF 0000000000yyyyyxxxxxx 110yyyyy 10xxxxxx
u0800..uD7FF, uE000..uFFFF 00000zzzzyyyyyyxxxxxx 1110zzzz 10yyyyyy 10xxxxxx
u10000..u10FFFF uuuzzzzzzyyyyyyxxxxxx 11110uuu 10zzzzzz 10yyyyyy 10xxxxxx
*/
char*
ox_ucs_to_utf8_chars(char *text, uint64_t u) {
int reading = 0;
int i;
unsigned char c;
if (u <= 0x000000000000007FULL) {
/* 0xxxxxxx */
*text++ = (char)u;
} else if (u <= 0x00000000000007FFULL) {
/* 110yyyyy 10xxxxxx */
*text++ = (char)(0x00000000000000C0ULL | (0x000000000000001FULL & (u >> 6)));
*text++ = (char)(0x0000000000000080ULL | (0x000000000000003FULL & u));
} else if (u <= 0x000000000000D7FFULL || (0x000000000000E000ULL <= u && u <= 0x000000000000FFFFULL)) {
/* 1110zzzz 10yyyyyy 10xxxxxx */
*text++ = (char)(0x00000000000000E0ULL | (0x000000000000000FULL & (u >> 12)));
*text++ = (char)(0x0000000000000080ULL | (0x000000000000003FULL & (u >> 6)));
*text++ = (char)(0x0000000000000080ULL | (0x000000000000003FULL & u));
} else if (0x0000000000010000ULL <= u && u <= 0x000000000010FFFFULL) {
/* 11110uuu 10zzzzzz 10yyyyyy 10xxxxxx */
*text++ = (char)(0x00000000000000F0ULL | (0x0000000000000007ULL & (u >> 18)));
*text++ = (char)(0x0000000000000080ULL | (0x000000000000003FULL & (u >> 12)));
*text++ = (char)(0x0000000000000080ULL | (0x000000000000003FULL & (u >> 6)));
*text++ = (char)(0x0000000000000080ULL | (0x000000000000003FULL & u));
} else {
/* assume it is UTF-8 encoded directly and not UCS */
for (i = 56; 0 <= i; i -= 8) {
c = (unsigned char)((u >> i) & 0x00000000000000FFULL);
if (reading) {
*text++ = (char)c;
} else if ('\0' != c) {
*text++ = (char)c;
reading = 1;
}
}
}
return text;
}
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