1 /* Store a character in UTF-8 string. 2 Copyright (C) 2002, 2005-2006, 2009-2020 Free Software Foundation, Inc. 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 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 General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 17 18 #include <config.h> 19 20 #if defined IN_LIBUNISTRING 21 /* Tell unistr.h to declare u8_uctomb as 'extern', not 'static inline'. */ 22 # include "unistring-notinline.h" 23 #endif 24 25 /* Specification. */ 26 #include "unistr.h" 27 28 #if !HAVE_INLINE 29 30 int 31 u8_uctomb (uint8_t *s, ucs4_t uc, int n) 32 { 33 if (uc < 0x80) 34 { 35 if (n > 0) 36 { 37 s[0] = uc; 38 return 1; 39 } 40 /* else return -2, below. */ 41 } 42 else 43 { 44 int count; 45 46 if (uc < 0x800) 47 count = 2; 48 else if (uc < 0x10000) 49 { 50 if (uc < 0xd800 || uc >= 0xe000) 51 count = 3; 52 else 53 return -1; 54 } 55 else if (uc < 0x110000) 56 count = 4; 57 else 58 return -1; 59 60 if (n >= count) 61 { 62 switch (count) /* note: code falls through cases! */ 63 { 64 case 4: s[3] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x10000; 65 case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800; 66 case 2: s[1] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0xc0; 67 /*case 1:*/ s[0] = uc; 68 } 69 return count; 70 } 71 } 72 return -2; 73 } 74 75 #endif 76