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/* Access functions for CNS 11643, plane 2 handling.
Copyright (C) 1998-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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;
}
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