HCoop / bpt / guile.git / blame
| Commit | Line | Data |
|---|---|---|
| 24d56127 | 1 | /* Conversion UCS-4 to UTF-8. |
| f0007cad | 2 | Copyright (C) 2002, 2006-2007, 2009-2012 Free Software Foundation, Inc. |
| 24d56127 LC |
3 | Written by Bruno Haible <bruno@clisp.org>, 2002. |
| 4 | ||
| 5 | This program is free software: you can redistribute it and/or modify it | |
| 6 | under the terms of the GNU Lesser General Public License as published | |
| 7 | by the Free Software Foundation; either version 3 of the License, or | |
| 8 | (at your option) any later version. | |
| 9 | ||
| 10 | This program is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Lesser General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public License | |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
| 17 | ||
| 18 | #include <config.h> | |
| 19 | ||
| 20 | /* Specification. */ | |
| 21 | #include "unistr.h" | |
| 22 | ||
| 23 | int | |
| 24 | u8_uctomb_aux (uint8_t *s, ucs4_t uc, int n) | |
| 25 | { | |
| 26 | int count; | |
| 27 | ||
| 28 | if (uc < 0x80) | |
| 29 | /* The case n >= 1 is already handled by the caller. */ | |
| 30 | return -2; | |
| 31 | else if (uc < 0x800) | |
| 32 | count = 2; | |
| 33 | else if (uc < 0x10000) | |
| 34 | { | |
| 35 | if (uc < 0xd800 || uc >= 0xe000) | |
| 1cd4fffc | 36 | count = 3; |
| 24d56127 | 37 | else |
| 1cd4fffc | 38 | return -1; |
| 24d56127 LC |
39 | } |
| 40 | #if 0 | |
| 41 | else if (uc < 0x200000) | |
| 42 | count = 4; | |
| 43 | else if (uc < 0x4000000) | |
| 44 | count = 5; | |
| 45 | else if (uc <= 0x7fffffff) | |
| 46 | count = 6; | |
| 47 | #else | |
| 48 | else if (uc < 0x110000) | |
| 49 | count = 4; | |
| 50 | #endif | |
| 51 | else | |
| 52 | return -1; | |
| 53 | ||
| 54 | if (n < count) | |
| 55 | return -2; | |
| 56 | ||
| 57 | switch (count) /* note: code falls through cases! */ | |
| 58 | { | |
| 59 | #if 0 | |
| 60 | case 6: s[5] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x4000000; | |
| 61 | case 5: s[4] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x200000; | |
| 62 | #endif | |
| 63 | case 4: s[3] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x10000; | |
| 64 | case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800; | |
| 65 | case 2: s[1] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0xc0; | |
| 66 | /*case 1:*/ s[0] = uc; | |
| 67 | } | |
| 68 | return count; | |
| 69 | } |