Home | History | Annotate | Line # | Download | only in locale
fix_grouping.c revision 1.4.2.2 
      1 /* $NetBSD: fix_grouping.c,v 1.4.2.2 2009/01/15 03:24:07 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 1.4.2.2 2009/01/15 03:24:07 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 static const char nogrouping[] = { NBCHAR_MAX, '\0' };
     48 
     49 /* don't use libc's isdigit, it owes locale. */
     50 #undef isdigit
     51 #define isdigit(c)	(c >= '0' && c <= '9')
     52 
     53 /*
     54  * Internal helper used to convert grouping sequences from string
     55  * representation into POSIX specified form, i.e.
     56  *
     57  * "3;3;-1" -> "\003\003\177\000"
     58  */
     59 
     60 const char *
     61 __fix_locale_grouping_str(const char *str)
     62 {
     63 	char *src, *dst;
     64 	char n;
     65 
     66 	if (str == NULL || *str == '\0') {
     67 		return nogrouping;
     68 	}
     69 
     70 	for (src = __UNCONST(str), dst = __UNCONST(str); *src != '\0'; src++) {
     71 
     72 		/* input string examples: "3;3", "3;2;-1" */
     73 		if (*src == ';')
     74 			continue;
     75 
     76 		if (*src == '-' && *(src+1) == '1') {
     77 			*dst++ = NBCHAR_MAX;
     78 			src++;
     79 			continue;
     80 		}
     81 
     82 		if (!isdigit((unsigned char)*src)) {
     83 			/* broken grouping string */
     84 			return nogrouping;
     85 		}
     86 
     87 		/* assume all numbers <= 99 */
     88 		n = *src - '0';
     89 		if (isdigit((unsigned char)*(src+1))) {
     90 			src++;
     91 			n *= 10;
     92 			n += *src - '0';
     93 		}
     94 
     95 		*dst = n;
     96 		/* NOTE: assume all input started with "0" as 'no grouping' */
     97 		if (*dst == '\0')
     98 			return (dst == __UNCONST(str)) ? nogrouping : str;
     99 		dst++;
    100 	}
    101 	*dst = '\0';
    102 	return str;
    103 }
    104