lib/libc/locale/ldpart.c

   1 /*
   2  * Copyright (c) 2000, 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  * $FreeBSD: head/lib/libc/locale/ldpart.c 241046 2012-09-29 11:54:34Z jilles $
  27  */
  28
  29
  30 #include "namespace.h"
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33
  34 #include <errno.h>
  35 #include <fcntl.h>
  36 #include <limits.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40 #include "un-namespace.h"
  41
  42 #include "ldpart.h"
  43 #include "setlocale.h"
  44
  45 static int split_lines(char *, const char *);
  46
  47 int
  48 __part_load_locale(const char *name,
  49                 int *using_locale,
  50                 char **locale_buf,
  51                 const char *category_filename,
  52                 int locale_buf_size_max,
  53                 int locale_buf_size_min,
  54                 const char **dst_localebuf)
  55 {
  56         int             saverr, fd, i, num_lines;
  57         char            *lbuf, *p;
  58         const char      *plim;
  59         char            filename[PATH_MAX];
  60         struct stat     st;
  61         size_t          namesize, bufsize;
  62
  63         /* 'name' must be already checked. */
  64         if (strcmp(name, "C") == 0 || strcmp(name, "POSIX") == 0) {
  65                 *using_locale = 0;
  66                 return (_LDP_CACHE);
  67         }
  68
  69         /*
  70          * If the locale name is the same as our cache, use the cache.
  71          */
  72         if (*locale_buf != NULL && strcmp(name, *locale_buf) == 0) {
  73                 *using_locale = 1;
  74                 return (_LDP_CACHE);
  75         }
  76
  77         /*
  78          * Slurp the locale file into the cache.
  79          */
  80         namesize = strlen(name) + 1;
  81
  82         /* 'PathLocale' must be already set & checked. */
  83
  84         /* Range checking not needed, 'name' size is limited */
  85         strcpy(filename, _PathLocale);
  86         strcat(filename, "/");
  87         strcat(filename, name);
  88         strcat(filename, "/");
  89         strcat(filename, category_filename);
  90         if ((fd = _open(filename, O_RDONLY | O_CLOEXEC)) < 0)
  91                 return (_LDP_ERROR);
  92         if (_fstat(fd, &st) != 0)
  93                 goto bad_locale;
  94         if (st.st_size <= 0) {
  95                 errno = EFTYPE;
  96                 goto bad_locale;
  97         }
  98         bufsize = namesize + st.st_size;
  99         if ((lbuf = malloc(bufsize)) == NULL) {
 100                 errno = ENOMEM;
 101                 goto bad_locale;
 102         }
 103         (void)strcpy(lbuf, name);
 104         p = lbuf + namesize;
 105         plim = p + st.st_size;
 106         if (_read(fd, p, (size_t) st.st_size) != st.st_size)
 107                 goto bad_lbuf;
 108         /*
 109          * Parse the locale file into localebuf.
 110          */
 111         if (plim[-1] != '\n') {
 112                 errno = EFTYPE;
 113                 goto bad_lbuf;
 114         }
 115         num_lines = split_lines(p, plim);
 116         if (num_lines >= locale_buf_size_max)
 117                 num_lines = locale_buf_size_max;
 118         else if (num_lines >= locale_buf_size_min)
 119                 num_lines = locale_buf_size_min;
 120         else {
 121                 errno = EFTYPE;
 122                 goto bad_lbuf;
 123         }
 124         (void)_close(fd);
 125         /*
 126          * Record the successful parse in the cache.
 127          */
 128         if (*locale_buf != NULL)
 129                 free(*locale_buf);
 130         *locale_buf = lbuf;
 131         for (p = *locale_buf, i = 0; i < num_lines; i++)
 132                 dst_localebuf[i] = (p += strlen(p) + 1);
 133         for (i = num_lines; i < locale_buf_size_max; i++)
 134                 dst_localebuf[i] = NULL;
 135         *using_locale = 1;
 136
 137         return (_LDP_LOADED);
 138
 139 bad_lbuf:
 140         saverr = errno;
 141         free(lbuf);
 142         errno = saverr;
 143 bad_locale:
 144         saverr = errno;
 145         (void)_close(fd);
 146         errno = saverr;
 147
 148         return (_LDP_ERROR);
 149 }
 150
 151 static int
 152 split_lines(char *p, const char *plim)
 153 {
 154         int i;
 155
 156         i = 0;
 157         while (p < plim) {
 158                 if (*p == '\n') {
 159                         *p = '\0';
 160                         i++;
 161                 }
 162                 p++;
 163         }
 164         return (i);
 165 }
 166