#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)utf2.c 8.1 (Berkeley) 6/4/93";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/locale/utf2.c,v 1.7 2002/03/22 21:52:18 obrien Exp $");
#include <rune.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
rune_t _UTF2_sgetrune(const char *, size_t, char const **);
int _UTF2_sputrune(rune_t, char *, size_t, char **);
static int _utf_count[16] = {
1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 2, 2, 3, 0,
};
int
_UTF2_init(rl)
_RuneLocale *rl;
{
rl->sgetrune = _UTF2_sgetrune;
rl->sputrune = _UTF2_sputrune;
_CurrentRuneLocale = rl;
__mb_cur_max = 3;
return (0);
}
rune_t
_UTF2_sgetrune(string, n, result)
const char *string;
size_t n;
char const **result;
{
int c;
if (n < 1 || (c = _utf_count[(*string >> 4) & 0xf]) > n) {
if (result)
*result = string;
return (_INVALID_RUNE);
}
switch (c) {
case 1:
if (result)
*result = string + 1;
return (*string & 0xff);
case 2:
if ((string[1] & 0xC0) != 0x80)
goto encoding_error;
if (result)
*result = string + 2;
return (((string[0] & 0x1F) << 6) | (string[1] & 0x3F));
case 3:
if ((string[1] & 0xC0) != 0x80 || (string[2] & 0xC0) != 0x80)
goto encoding_error;
if (result)
*result = string + 3;
return (((string[0] & 0x1F) << 12) | ((string[1] & 0x3F) << 6)
| (string[2] & 0x3F));
default:
encoding_error: if (result)
*result = string + 1;
return (_INVALID_RUNE);
}
}
int
_UTF2_sputrune(c, string, n, result)
rune_t c;
char *string, **result;
size_t n;
{
if (c & 0xF800) {
if (n >= 3) {
if (string) {
string[0] = 0xE0 | ((c >> 12) & 0x0F);
string[1] = 0x80 | ((c >> 6) & 0x3F);
string[2] = 0x80 | ((c) & 0x3F);
}
if (result)
*result = string + 3;
} else
if (result)
*result = NULL;
return (3);
} else
if (c & 0x0780) {
if (n >= 2) {
if (string) {
string[0] = 0xC0 | ((c >> 6) & 0x1F);
string[1] = 0x80 | ((c) & 0x3F);
}
if (result)
*result = string + 2;
} else
if (result)
*result = NULL;
return (2);
} else {
if (n >= 1) {
if (string)
string[0] = c;
if (result)
*result = string + 1;
} else
if (result)
*result = NULL;
return (1);
}
}