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fix_grouping.c revision 1.4.2.2 
      1  1.4.2.2  snj /* $NetBSD: fix_grouping.c,v 1.4.2.2 2009/01/15 03:24:07 snj Exp $ */
      2  1.4.2.2  snj 
      3  1.4.2.2  snj /*
      4  1.4.2.2  snj  * Copyright (c) 2001 Alexey Zelkin <phantom (at) FreeBSD.org>
      5  1.4.2.2  snj  * All rights reserved.
      6  1.4.2.2  snj  *
      7  1.4.2.2  snj  * Redistribution and use in source and binary forms, with or without
      8  1.4.2.2  snj  * modification, are permitted provided that the following conditions
      9  1.4.2.2  snj  * are met:
     10  1.4.2.2  snj  * 1. Redistributions of source code must retain the above copyright
     11  1.4.2.2  snj  *    notice, this list of conditions and the following disclaimer.
     12  1.4.2.2  snj  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.4.2.2  snj  *    notice, this list of conditions and the following disclaimer in the
     14  1.4.2.2  snj  *    documentation and/or other materials provided with the distribution.
     15  1.4.2.2  snj  *
     16  1.4.2.2  snj  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  1.4.2.2  snj  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  1.4.2.2  snj  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  1.4.2.2  snj  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  1.4.2.2  snj  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  1.4.2.2  snj  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  1.4.2.2  snj  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  1.4.2.2  snj  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  1.4.2.2  snj  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  1.4.2.2  snj  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  1.4.2.2  snj  * SUCH DAMAGE.
     27  1.4.2.2  snj  *
     28  1.4.2.2  snj  * Original version ID:
     29  1.4.2.2  snj  *     FreeBSD: fix_grouping.c,v 1.8 2003/06/26 10:46:16 phantom Exp
     30  1.4.2.2  snj  */
     31  1.4.2.2  snj 
     32  1.4.2.2  snj #include <sys/cdefs.h>
     33  1.4.2.2  snj #if defined(LIBC_SCCS) && !defined(lint)
     34  1.4.2.2  snj __RCSID("$NetBSD: fix_grouping.c,v 1.4.2.2 2009/01/15 03:24:07 snj Exp $");
     35  1.4.2.2  snj #endif /* LIBC_SCCS and not lint */
     36  1.4.2.2  snj 
     37  1.4.2.2  snj #include <ctype.h>
     38  1.4.2.2  snj #include <limits.h>
     39  1.4.2.2  snj #include <stddef.h>
     40  1.4.2.2  snj 
     41  1.4.2.2  snj #include "fix_grouping.h"
     42  1.4.2.2  snj 
     43  1.4.2.2  snj #ifndef NBCHAR_MAX
     44  1.4.2.2  snj #define NBCHAR_MAX	CHAR_MAX
     45  1.4.2.2  snj #endif
     46  1.4.2.2  snj 
     47  1.4.2.2  snj static const char nogrouping[] = { NBCHAR_MAX, '\0' };
     48  1.4.2.2  snj 
     49  1.4.2.2  snj /* don't use libc's isdigit, it owes locale. */
     50  1.4.2.2  snj #undef isdigit
     51  1.4.2.2  snj #define isdigit(c)	(c >= '0' && c <= '9')
     52  1.4.2.2  snj 
     53  1.4.2.2  snj /*
     54  1.4.2.2  snj  * Internal helper used to convert grouping sequences from string
     55  1.4.2.2  snj  * representation into POSIX specified form, i.e.
     56  1.4.2.2  snj  *
     57  1.4.2.2  snj  * "3;3;-1" -> "\003\003\177\000"
     58  1.4.2.2  snj  */
     59  1.4.2.2  snj 
     60  1.4.2.2  snj const char *
     61  1.4.2.2  snj __fix_locale_grouping_str(const char *str)
     62  1.4.2.2  snj {
     63  1.4.2.2  snj 	char *src, *dst;
     64  1.4.2.2  snj 	char n;
     65  1.4.2.2  snj 
     66  1.4.2.2  snj 	if (str == NULL || *str == '\0') {
     67  1.4.2.2  snj 		return nogrouping;
     68  1.4.2.2  snj 	}
     69  1.4.2.2  snj 
     70  1.4.2.2  snj 	for (src = __UNCONST(str), dst = __UNCONST(str); *src != '\0'; src++) {
     71  1.4.2.2  snj 
     72  1.4.2.2  snj 		/* input string examples: "3;3", "3;2;-1" */
     73  1.4.2.2  snj 		if (*src == ';')
     74  1.4.2.2  snj 			continue;
     75  1.4.2.2  snj 
     76  1.4.2.2  snj 		if (*src == '-' && *(src+1) == '1') {
     77  1.4.2.2  snj 			*dst++ = NBCHAR_MAX;
     78  1.4.2.2  snj 			src++;
     79  1.4.2.2  snj 			continue;
     80  1.4.2.2  snj 		}
     81  1.4.2.2  snj 
     82  1.4.2.2  snj 		if (!isdigit((unsigned char)*src)) {
     83  1.4.2.2  snj 			/* broken grouping string */
     84  1.4.2.2  snj 			return nogrouping;
     85  1.4.2.2  snj 		}
     86  1.4.2.2  snj 
     87  1.4.2.2  snj 		/* assume all numbers <= 99 */
     88  1.4.2.2  snj 		n = *src - '0';
     89  1.4.2.2  snj 		if (isdigit((unsigned char)*(src+1))) {
     90  1.4.2.2  snj 			src++;
     91  1.4.2.2  snj 			n *= 10;
     92  1.4.2.2  snj 			n += *src - '0';
     93  1.4.2.2  snj 		}
     94  1.4.2.2  snj 
     95  1.4.2.2  snj 		*dst = n;
     96  1.4.2.2  snj 		/* NOTE: assume all input started with "0" as 'no grouping' */
     97  1.4.2.2  snj 		if (*dst == '\0')
     98  1.4.2.2  snj 			return (dst == __UNCONST(str)) ? nogrouping : str;
     99  1.4.2.2  snj 		dst++;
    100  1.4.2.2  snj 	}
    101  1.4.2.2  snj 	*dst = '\0';
    102  1.4.2.2  snj 	return str;
    103  1.4.2.2  snj }
    104