mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 01:21:06 +00:00
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/* Access functions for CNS 11643, plane 2 handling.
|
|
Copyright (C) 1998-2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <stdint.h>
|
|
#include <gconv.h>
|
|
|
|
/* Table for CNS 11643, plane 2 to UCS4 conversion. */
|
|
extern const uint16_t __cns11643l2_to_ucs4_tab[];
|
|
|
|
|
|
static inline uint32_t
|
|
__attribute ((always_inline))
|
|
cns11643l2_to_ucs4 (const unsigned char **s, size_t avail,
|
|
unsigned char offset)
|
|
{
|
|
unsigned char ch = *(*s);
|
|
unsigned char ch2;
|
|
int idx;
|
|
|
|
if (ch < offset || (ch - offset) <= 0x20 || (ch - offset) > 0x7d)
|
|
return __UNKNOWN_10646_CHAR;
|
|
|
|
if (avail < 2)
|
|
return 0;
|
|
|
|
ch2 = (*s)[1];
|
|
if ((ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
|
|
return __UNKNOWN_10646_CHAR;
|
|
|
|
idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);
|
|
if (idx > 0x1de1)
|
|
return __UNKNOWN_10646_CHAR;
|
|
|
|
(*s) += 2;
|
|
|
|
return __cns11643l2_to_ucs4_tab[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
|
|
}
|
|
|
|
|
|
/* The table which contains the CNS 11643 level 2 mappings. */
|
|
extern const char __cns11643_from_ucs4p0_tab[][3];
|
|
|
|
|
|
static inline size_t
|
|
__attribute ((always_inline))
|
|
ucs4_to_cns11643l2 (uint32_t wch, unsigned char *s, size_t avail)
|
|
{
|
|
unsigned int ch = (unsigned int) wch;
|
|
const char *cp = NULL;
|
|
|
|
if (ch >= 0x4e07 && ch <= 0x9fa4)
|
|
{
|
|
cp = __cns11643_from_ucs4p0_tab[ch - 0x3400];
|
|
if (cp[0] == '\2')
|
|
++cp;
|
|
else
|
|
cp = NULL;
|
|
}
|
|
|
|
if (cp == NULL)
|
|
return __UNKNOWN_10646_CHAR;
|
|
|
|
if (avail < 2)
|
|
return 0;
|
|
|
|
s[0] = cp[0];
|
|
s[1] = cp[1];
|
|
|
|
return 2;
|
|
}
|