1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <ctype.h> 30 #include <limits.h> 31 #include <stddef.h> 32 33 static const char nogrouping[] = { '\0' }; 34 35 /* 36 * Internal helper used to convert grouping sequences from string 37 * representation into POSIX specified form, i.e. 38 * 39 * "3;3;-1" -> "\003\003\177\000" 40 */ 41 42 const char * 43 __fix_locale_grouping_str(const char *str) 44 { 45 char *src, *dst; 46 char n; 47 48 if (str == NULL || *str == '\0') { 49 return nogrouping; 50 } 51 52 for (src = (char*)str, dst = (char*)str; *src != '\0'; src++) { 53 54 /* input string examples: "3;3", "3;2;-1" */ 55 if (*src == ';') 56 continue; 57 58 if (*src == '-' && *(src+1) == '1') { 59 *dst++ = CHAR_MAX; 60 src++; 61 continue; 62 } 63 64 if (!isdigit((unsigned char)*src)) { 65 /* broken grouping string */ 66 return nogrouping; 67 } 68 69 /* assume all numbers <= 99 */ 70 n = *src - '0'; 71 if (isdigit((unsigned char)*(src+1))) { 72 src++; 73 n *= 10; 74 n += *src - '0'; 75 } 76 77 *dst = n; 78 /* NOTE: assume all input started with "0" as 'no grouping' */ 79 if (*dst == '\0') 80 return (dst == (char*)str) ? nogrouping : str; 81 dst++; 82 } 83 *dst = '\0'; 84 return str; 85 } 86