1 /************************************************* 2 * Perl-Compatible Regular Expressions * 3 *************************************************/ 4 5 /* PCRE is a library of functions to support regular expressions whose syntax 6 and semantics are as close as possible to those of the Perl 5 language. 7 8 Written by Philip Hazel 9 Original API code Copyright (c) 1997-2012 University of Cambridge 10 New API code Copyright (c) 2016 University of Cambridge 11 12 ----------------------------------------------------------------------------- 13 Redistribution and use in source and binary forms, with or without 14 modification, are permitted provided that the following conditions are met: 15 16 * Redistributions of source code must retain the above copyright notice, 17 this list of conditions and the following disclaimer. 18 19 * Redistributions in binary form must reproduce the above copyright 20 notice, this list of conditions and the following disclaimer in the 21 documentation and/or other materials provided with the distribution. 22 23 * Neither the name of the University of Cambridge nor the names of its 24 contributors may be used to endorse or promote products derived from 25 this software without specific prior written permission. 26 27 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 28 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 31 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 POSSIBILITY OF SUCH DAMAGE. 38 ----------------------------------------------------------------------------- 39 */ 40 41 42 /* This file contains a function that converts a Unicode character code point 43 into a UTF string. The behaviour is different for each code unit width. */ 44 45 46 #ifdef HAVE_CONFIG_H 47 #include "config.h" 48 #endif 49 50 #include "pcre2_internal.h" 51 52 53 /* If SUPPORT_UNICODE is not defined, this function will never be called. 54 Supply a dummy function because some compilers do not like empty source 55 modules. */ 56 57 #ifndef SUPPORT_UNICODE 58 unsigned int 59 PRIV(ord2utf)(uint32_t cvalue, PCRE2_UCHAR *buffer) 60 { 61 (void)(cvalue); 62 (void)(buffer); 63 return 0; 64 } 65 #else /* SUPPORT_UNICODE */ 66 67 68 /************************************************* 69 * Convert code point to UTF * 70 *************************************************/ 71 72 /* 73 Arguments: 74 cvalue the character value 75 buffer pointer to buffer for result 76 77 Returns: number of code units placed in the buffer 78 */ 79 80 unsigned int 81 PRIV(ord2utf)(uint32_t cvalue, PCRE2_UCHAR *buffer) 82 { 83 /* Convert to UTF-8 */ 84 85 #if PCRE2_CODE_UNIT_WIDTH == 8 86 int i, j; 87 for (i = 0; i < PRIV(utf8_table1_size); i++) 88 if ((int)cvalue <= PRIV(utf8_table1)[i]) break; 89 buffer += i; 90 for (j = i; j > 0; j--) 91 { 92 *buffer-- = 0x80 | (cvalue & 0x3f); 93 cvalue >>= 6; 94 } 95 *buffer = PRIV(utf8_table2)[i] | cvalue; 96 return i + 1; 97 98 /* Convert to UTF-16 */ 99 100 #elif PCRE2_CODE_UNIT_WIDTH == 16 101 if (cvalue <= 0xffff) 102 { 103 *buffer = (PCRE2_UCHAR)cvalue; 104 return 1; 105 } 106 cvalue -= 0x10000; 107 *buffer++ = 0xd800 | (cvalue >> 10); 108 *buffer = 0xdc00 | (cvalue & 0x3ff); 109 return 2; 110 111 /* Convert to UTF-32 */ 112 113 #else 114 *buffer = (PCRE2_UCHAR)cvalue; 115 return 1; 116 #endif 117 } 118 #endif /* SUPPORT_UNICODE */ 119 120 /* End of pcre_ord2utf.c */ 121