1 /* Searching a string for a character among a given set of characters. 2 Copyright (C) 1999, 2002, 2006-2021 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2007. 4 5 This file is free software: you can redistribute it and/or modify 6 it under the terms of the GNU Lesser General Public License as 7 published by the Free Software Foundation; either version 3 of the 8 License, or (at your option) any later version. 9 10 This file 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 13 GNU 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 <https://www.gnu.org/licenses/>. */ 17 18 #include <config.h> 19 20 /* Specification. */ 21 #include <string.h> 22 23 #include "mbuiter.h" 24 25 /* Find the first occurrence in the character string STRING of any character 26 in the character string ACCEPT. Return the number of bytes from the 27 beginning of the string to this occurrence, or to the end of the string 28 if none exists. */ 29 size_t 30 mbscspn (const char *string, const char *accept) /* */ 31 { 32 /* Optimize two cases. */ 33 if (accept[0] == '\0') 34 return strlen (string); 35 if (accept[1] == '\0') 36 { 37 const char *ptr = mbschr (string, accept[0]); 38 return (ptr != NULL ? ptr - string : strlen (string)); 39 } 40 /* General case. */ 41 if (MB_CUR_MAX > 1) 42 { 43 mbui_iterator_t iter; 44 45 for (mbui_init (iter, string); mbui_avail (iter); mbui_advance (iter)) 46 { 47 if (mb_len (mbui_cur (iter)) == 1) 48 { 49 if (mbschr (accept, * mbui_cur_ptr (iter))) 50 goto found; 51 } 52 else 53 { 54 mbui_iterator_t aiter; 55 56 for (mbui_init (aiter, accept); 57 mbui_avail (aiter); 58 mbui_advance (aiter)) 59 if (mb_equal (mbui_cur (aiter), mbui_cur (iter))) 60 goto found; 61 } 62 } 63 found: 64 return mbui_cur_ptr (iter) - string; 65 } 66 else 67 return strcspn (string, accept); 68 }