mirror of
https://github.com/omar-polo/gmid.git
synced 2024-09-12 14:08:40 +02:00
97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
/* Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person
|
|
* obtaining a copy of this software and associated documentation
|
|
* files (the "Software"), to deal in the Software without
|
|
* restriction, including without limitation the rights to use, copy,
|
|
* modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
* of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include "gmid.h"
|
|
|
|
#define UTF8_ACCEPT 0
|
|
#define UTF8_REJECT 1
|
|
|
|
static const uint8_t utf8d[] = {
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 00..1f
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 20..3f
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 40..5f
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 60..7f
|
|
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, // 80..9f
|
|
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, // a0..bf
|
|
8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, // c0..df
|
|
0xa,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x3,0x3, // e0..ef
|
|
0xb,0x6,0x6,0x6,0x5,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8, // f0..ff
|
|
0x0,0x1,0x2,0x3,0x5,0x8,0x7,0x1,0x1,0x1,0x4,0x6,0x1,0x1,0x1,0x1, // s0..s0
|
|
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,0,1,0,1,1,1,1,1,1, // s1..s2
|
|
1,2,1,1,1,1,1,2,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1, // s3..s4
|
|
1,2,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,3,1,3,1,1,1,1,1,1, // s5..s6
|
|
1,3,1,1,1,1,1,3,1,3,1,1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1, // s7..s8
|
|
};
|
|
|
|
static inline uint32_t
|
|
utf8_decode(uint32_t* state, uint32_t* codep, uint8_t byte) {
|
|
uint32_t type = utf8d[byte];
|
|
|
|
*codep = (*state != UTF8_ACCEPT) ?
|
|
(byte & 0x3fu) | (*codep << 6) :
|
|
(0xff >> type) & (byte);
|
|
|
|
*state = utf8d[256 + *state*16 + type];
|
|
return *state;
|
|
}
|
|
|
|
/* for the iri parser. Modelled after printCodePoints */
|
|
int
|
|
valid_multibyte_utf8(struct parser *p)
|
|
{
|
|
uint32_t cp = 0, state = 0;
|
|
|
|
for (; *p->iri; p->iri++)
|
|
if (!utf8_decode(&state, &cp, *p->iri))
|
|
break;
|
|
|
|
/* reject the ASCII range */
|
|
if (state || cp <= 0x7F) {
|
|
/* XXX: do some error recovery? */
|
|
if (state)
|
|
p->err = "invalid UTF-8 character";
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
char *
|
|
utf8_nth(char *s, size_t n)
|
|
{
|
|
size_t i;
|
|
uint32_t cp = 0, state = 0;
|
|
|
|
for (i = 0; *s && i < n; ++s)
|
|
if (!utf8_decode(&state, &cp, *s))
|
|
++i;
|
|
|
|
if (state != UTF8_ACCEPT)
|
|
return NULL;
|
|
if (i == n)
|
|
return s;
|
|
return NULL;
|
|
}
|