usr/src/lib/libc/port/locale/fix_grouping.c

   1 /*
   2  * Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 /*
  28  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
  29  * Use is subject to license terms.
  30  */
  31
  32 #include "lint.h"
  33 #include <ctype.h>
  34 #include <limits.h>
  35 #include <stddef.h>
  36
  37 static const char nogrouping[] = { CHAR_MAX, '\0' };
  38
  39 /*
  40  * Internal helper used to convert grouping sequences from string
  41  * representation into POSIX specified form, i.e.
  42  *
  43  * "3;3;-1" -> "\003\003\177\000"
  44  */
  45
  46 const char *
  47 __fix_locale_grouping_str(const char *str)
  48 {
  49         char *src, *dst;
  50         char n;
  51
  52         if (str == NULL || *str == '\0') {
  53                 return (nogrouping);
  54         }
  55
  56         for (src = (char *)str, dst = (char *)str; *src != '\0'; src++) {
  57
  58                 /* input string examples: "3;3", "3;2;-1" */
  59                 if (*src == ';')
  60                         continue;
  61
  62                 if (*src == '-' && *(src+1) == '1') {
  63                         *dst++ = CHAR_MAX;
  64                         src++;
  65                         continue;
  66                 }
  67
  68                 if (!isdigit((unsigned char)*src)) {
  69                         /* broken grouping string */
  70                         return (nogrouping);
  71                 }
  72
  73                 /* assume all numbers <= 99 */
  74                 n = *src - '0';
  75                 if (isdigit((unsigned char)*(src+1))) {
  76                         src++;
  77                         n *= 10;
  78                         n += *src - '0';
  79                 }
  80
  81                 *dst = n;
  82                 /* NOTE: assume all input started with "0" as 'no grouping' */
  83                 if (*dst == '\0')
  84                         return ((dst == (char *)str) ? nogrouping : str);
  85                 dst++;
  86         }
  87         *dst = '\0';
  88         return (str);
  89 }