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fix_grouping.c revision 1.4.2.3 
      1 /* $NetBSD: fix_grouping.c,v 1.4.2.3 2009/01/15 04:00:38 snj 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 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 __RCSID("$NetBSD: fix_grouping.c,v 1.4.2.3 2009/01/15 04:00:38 snj Exp $");
     35 #endif /* LIBC_SCCS and not lint */
     36 
     37 #include <ctype.h>
     38 #include <limits.h>
     39 #include <stddef.h>
     40 
     41 #include "fix_grouping.h"
     42 
     43 #ifndef NBCHAR_MAX
     44 #define NBCHAR_MAX	CHAR_MAX
     45 #endif
     46 
     47 #ifndef __UNCONST
     48 #define __UNCONST(a)    ((void *)(unsigned long)(const void *)(a))
     49 #endif
     50 
     51 static const char nogrouping[] = { NBCHAR_MAX, '\0' };
     52 
     53 /* don't use libc's isdigit, it owes locale. */
     54 #undef isdigit
     55 #define isdigit(c)	(c >= '0' && c <= '9')
     56 
     57 /*
     58  * Internal helper used to convert grouping sequences from string
     59  * representation into POSIX specified form, i.e.
     60  *
     61  * "3;3;-1" -> "\003\003\177\000"
     62  */
     63 
     64 const char *
     65 __fix_locale_grouping_str(const char *str)
     66 {
     67 	char *src, *dst;
     68 	char n;
     69 
     70 	if (str == NULL || *str == '\0') {
     71 		return nogrouping;
     72 	}
     73 
     74 	for (src = __UNCONST(str), dst = __UNCONST(str); *src != '\0'; src++) {
     75 
     76 		/* input string examples: "3;3", "3;2;-1" */
     77 		if (*src == ';')
     78 			continue;
     79 
     80 		if (*src == '-' && *(src+1) == '1') {
     81 			*dst++ = NBCHAR_MAX;
     82 			src++;
     83 			continue;
     84 		}
     85 
     86 		if (!isdigit((unsigned char)*src)) {
     87 			/* broken grouping string */
     88 			return nogrouping;
     89 		}
     90 
     91 		/* assume all numbers <= 99 */
     92 		n = *src - '0';
     93 		if (isdigit((unsigned char)*(src+1))) {
     94 			src++;
     95 			n *= 10;
     96 			n += *src - '0';
     97 		}
     98 
     99 		*dst = n;
    100 		/* NOTE: assume all input started with "0" as 'no grouping' */
    101 		if (*dst == '\0')
    102 			return (dst == __UNCONST(str)) ? nogrouping : str;
    103 		dst++;
    104 	}
    105 	*dst = '\0';
    106 	return str;
    107 }
    108