| 1 | /* Conversion UCS-4 to UTF-8.
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| 2 | Copyright (C) 2002, 2006-2007, 2009-2012 Free Software Foundation, Inc.
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| 3 | Written by Bruno Haible <bruno@clisp.org>, 2002.
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| 4 |
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| 5 | This program is free software: you can redistribute it and/or modify it
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| 6 | under the terms of the GNU General Public License as published
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| 7 | by the Free Software Foundation; either version 3 of the License, or
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| 8 | (at your option) any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | #include <config.h>
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| 19 |
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| 20 | /* Specification. */
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| 21 | #include "unistr.h"
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| 22 |
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| 23 | int
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| 24 | u8_uctomb_aux (uint8_t *s, ucs4_t uc, int n)
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| 25 | {
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| 26 | int count;
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| 27 |
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| 28 | if (uc < 0x80)
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| 29 | /* The case n >= 1 is already handled by the caller. */
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| 30 | return -2;
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| 31 | else if (uc < 0x800)
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| 32 | count = 2;
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| 33 | else if (uc < 0x10000)
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| 34 | {
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| 35 | if (uc < 0xd800 || uc >= 0xe000)
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| 36 | count = 3;
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| 37 | else
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| 38 | return -1;
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| 39 | }
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| 40 | #if 0
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| 41 | else if (uc < 0x200000)
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| 42 | count = 4;
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| 43 | else if (uc < 0x4000000)
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| 44 | count = 5;
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| 45 | else if (uc <= 0x7fffffff)
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| 46 | count = 6;
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| 47 | #else
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| 48 | else if (uc < 0x110000)
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| 49 | count = 4;
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| 50 | #endif
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| 51 | else
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| 52 | return -1;
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| 53 |
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| 54 | if (n < count)
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| 55 | return -2;
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| 56 |
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| 57 | switch (count) /* note: code falls through cases! */
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| 58 | {
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| 59 | #if 0
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| 60 | case 6: s[5] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x4000000;
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| 61 | case 5: s[4] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x200000;
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| 62 | #endif
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| 63 | case 4: s[3] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x10000;
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| 64 | case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800;
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| 65 | case 2: s[1] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0xc0;
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| 66 | /*case 1:*/ s[0] = uc;
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| 67 | }
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| 68 | return count;
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| 69 | }
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