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      1 /* $NetBSD: fix_grouping.c,v 1.7 2024/06/07 13:53:12 riastradh Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2001 Alexey Zelkin <phantom (at) 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  * Original version ID:
     29  *     FreeBSD: fix_grouping.c,v 1.8 2003/06/26 10:46:16 phantom Exp
     30  */
     31 
     32 #if HAVE_NBTOOL_CONFIG_H
     33 #include "nbtool_config.h"
     34 #endif
     35 
     36 #include <sys/cdefs.h>
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 __RCSID("$NetBSD: fix_grouping.c,v 1.7 2024/06/07 13:53:12 riastradh Exp $");
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include <limits.h>
     42 #include <stddef.h>
     43 
     44 #include "fix_grouping.h"
     45 
     46 #ifndef NBCHAR_MAX
     47 #define NBCHAR_MAX	CHAR_MAX
     48 #endif
     49 
     50 #ifndef __UNCONST
     51 #define __UNCONST(a)    ((void *)(unsigned long)(const void *)(a))
     52 #endif
     53 
     54 static const char nogrouping[] = { NBCHAR_MAX, '\0' };
     55 
     56 /* don't use libc's isdigit, it owes locale. */
     57 #define isdigit(c)	(c >= '0' && c <= '9')
     58 
     59 /*
     60  * Internal helper used to convert grouping sequences from string
     61  * representation into POSIX specified form, i.e.
     62  *
     63  * "3;3;-1" -> "\003\003\177\000"
     64  */
     65 
     66 const char *
     67 __fix_locale_grouping_str(const char *str)
     68 {
     69 	char *src, *dst;
     70 	char n;
     71 
     72 	if (str == NULL || *str == '\0') {
     73 		return nogrouping;
     74 	}
     75 
     76 	for (src = __UNCONST(str), dst = __UNCONST(str); *src != '\0'; src++) {
     77 
     78 		/* input string examples: "3;3", "3;2;-1" */
     79 		if (*src == ';')
     80 			continue;
     81 
     82 		if (*src == '-' && *(src+1) == '1') {
     83 			*dst++ = NBCHAR_MAX;
     84 			src++;
     85 			continue;
     86 		}
     87 
     88 		if (!isdigit((unsigned char)*src)) {
     89 			/* broken grouping string */
     90 			return nogrouping;
     91 		}
     92 
     93 		/* assume all numbers <= 99 */
     94 		n = *src - '0';
     95 		if (isdigit((unsigned char)*(src+1))) {
     96 			src++;
     97 			n *= 10;
     98 			n += *src - '0';
     99 		}
    100 
    101 		*dst = n;
    102 		/* NOTE: assume all input started with "0" as 'no grouping' */
    103 		if (*dst == '\0')
    104 			return (dst == __UNCONST(str)) ? nogrouping : str;
    105 		dst++;
    106 	}
    107 	*dst = '\0';
    108 	return str;
    109 }
    110