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86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/* Access functions for CNS 11643, plane 2 handling.
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Copyright (C) 1998-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdint.h>
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#include <gconv.h>
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/* Table for CNS 11643, plane 2 to UCS4 conversion. */
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extern const uint16_t __cns11643l2_to_ucs4_tab[];
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static inline uint32_t
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__attribute ((always_inline))
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cns11643l2_to_ucs4 (const unsigned char **s, size_t avail,
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unsigned char offset)
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{
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unsigned char ch = *(*s);
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unsigned char ch2;
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int idx;
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if (ch < offset || (ch - offset) <= 0x20 || (ch - offset) > 0x7d)
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return __UNKNOWN_10646_CHAR;
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if (avail < 2)
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return 0;
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ch2 = (*s)[1];
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if ((ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
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return __UNKNOWN_10646_CHAR;
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idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);
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if (idx > 0x1de1)
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return __UNKNOWN_10646_CHAR;
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(*s) += 2;
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return __cns11643l2_to_ucs4_tab[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
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}
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/* The table which contains the CNS 11643 level 2 mappings. */
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extern const char __cns11643_from_ucs4p0_tab[][3];
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static inline size_t
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__attribute ((always_inline))
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ucs4_to_cns11643l2 (uint32_t wch, unsigned char *s, size_t avail)
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{
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unsigned int ch = (unsigned int) wch;
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const char *cp = NULL;
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if (ch >= 0x4e07 && ch <= 0x9fa4)
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{
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cp = __cns11643_from_ucs4p0_tab[ch - 0x3400];
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if (cp[0] == '\2')
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++cp;
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else
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cp = NULL;
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}
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if (cp == NULL)
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return __UNKNOWN_10646_CHAR;
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if (avail < 2)
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return 0;
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s[0] = cp[0];
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s[1] = cp[1];
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return 2;
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}
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