181 lines
4.9 KiB
C
181 lines
4.9 KiB
C
/* Access functions for CNS 11643, plane 1 handling.
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Copyright (C) 1998-2022 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 1 to UCS4 conversion. */
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extern const uint16_t __cns11643l1_to_ucs4_tab[];
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static inline uint32_t
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__attribute ((always_inline))
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cns11643l1_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 > 0x21f2)
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return __UNKNOWN_10646_CHAR;
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(*s) += 2;
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return __cns11643l1_to_ucs4_tab[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
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}
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/* Tables for the UCS4 -> CNS conversion. */
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extern const char __cns11643l1_from_ucs4_tab1[][2];
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extern const char __cns11643l1_from_ucs4_tab2[][2];
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extern const char __cns11643l1_from_ucs4_tab3[][2];
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extern const char __cns11643l1_from_ucs4_tab4[][2];
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extern const char __cns11643l1_from_ucs4_tab5[][2];
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extern const char __cns11643l1_from_ucs4_tab6[][2];
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extern const char __cns11643l1_from_ucs4_tab7[][2];
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extern const char __cns11643l1_from_ucs4_tab8[][2];
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extern const char __cns11643l1_from_ucs4_tab9[][2];
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extern const char __cns11643l1_from_ucs4_tab10[][2];
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extern const char __cns11643l1_from_ucs4_tab11[][2];
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extern const char __cns11643l1_from_ucs4_tab12[][2];
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extern const char __cns11643l1_from_ucs4_tab13[][2];
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extern const char __cns11643l1_from_ucs4_tab14[][2];
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static inline size_t
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__attribute ((always_inline))
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ucs4_to_cns11643l1 (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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char buf[2];
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const char *cp = buf;
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switch (ch)
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{
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case 0xa7 ... 0xf7:
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cp = __cns11643l1_from_ucs4_tab1[ch - 0xa7];
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break;
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case 0x2c7 ... 0x2d9:
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cp = __cns11643l1_from_ucs4_tab2[ch - 0x2c7];
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break;
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case 0x391 ... 0x3c9:
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cp = __cns11643l1_from_ucs4_tab3[ch - 0x391];
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break;
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case 0x2013 ... 0x203e:
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cp = __cns11643l1_from_ucs4_tab4[ch - 0x2013];
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break;
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case 0x2103:
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cp = "\x22\x6a";
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break;
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case 0x2105:
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cp = "\x22\x22";
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break;
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case 0x2109:
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cp = "\x22\x6b";
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break;
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case 0x2160 ... 0x2169:
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buf[0] = '\x24';
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buf[1] = '\x2b' + (ch - 0x2160);
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break;
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case 0x2170 ... 0x2179:
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buf[0] = '\x26';
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buf[1] = '\x35' + (ch - 0x2170);
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break;
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case 0x2190 ... 0x2199:
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cp = __cns11643l1_from_ucs4_tab5[ch - 0x2190];
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break;
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case 0x2215 ... 0x2267:
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cp = __cns11643l1_from_ucs4_tab6[ch - 0x2215];
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break;
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case 0x22a5:
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cp = "\x22\x47";
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break;
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case 0x22bf:
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cp = "\x22\x4a";
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break;
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case 0x2400 ... 0x2421:
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cp = __cns11643l1_from_ucs4_tab7[ch - 0x2400];
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break;
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case 0x2460 ... 0x247d:
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cp = __cns11643l1_from_ucs4_tab8[ch - 0x2460];
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break;
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case 0x2500 ... 0x2642:
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cp = __cns11643l1_from_ucs4_tab9[ch - 0x2500];
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break;
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case 0x3000 ... 0x3029:
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cp = __cns11643l1_from_ucs4_tab10[ch - 0x3000];
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break;
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case 0x30fb:
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cp = "\x21\x26";
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break;
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case 0x3105 ... 0x3129:
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buf[0] = '\x25';
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buf[1] = '\x47' + (ch - 0x3105);
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break;
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case 0x32a3:
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cp = "\x22\x21";
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break;
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case 0x338e ... 0x33d5:
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cp = __cns11643l1_from_ucs4_tab11[ch - 0x338e];
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break;
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case 0x4e00 ... 0x9f9c:
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cp = __cns11643l1_from_ucs4_tab12[ch - 0x4e00];
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break;
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case 0xfe30 ... 0xfe6b:
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cp = __cns11643l1_from_ucs4_tab13[ch - 0xfe30];
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break;
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case 0xff01 ... 0xff5d:
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cp = __cns11643l1_from_ucs4_tab14[ch - 0xff01];
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break;
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case 0xffe0:
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cp = "\x22\x66";
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break;
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case 0xffe1:
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cp = "\x22\x67";
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break;
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case 0xffe5:
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cp = "\x22\x64";
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break;
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default:
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return __UNKNOWN_10646_CHAR;
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}
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if (cp[0] == '\0')
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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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