toolchain/gcc/newlib/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
  27 #include <sys/cdefs.h>
  28
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <sys/syslimits.h>
  32 #include <fcntl.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <unistd.h>
  36
  37 #include "setlocale.h"
  38 #include "ldpart.h"
  39
  40 static int split_lines(char *, const char *);
  41 static void set_from_buf(const char *, int, const char **);
  42
  43 int
  44 __part_load_locale(const char *name,
  45                 int *using_locale,
  46                 char *locale_buf,
  47                 const char *category_filename,
  48                 int locale_buf_size_max,
  49                 int locale_buf_size_min,
  50                 const char **dst_localebuf) {
  51
  52         static char             locale_buf_C[] = "C";
  53         static int              num_lines;
  54
  55         int                      fd;
  56         char                    *lbuf;
  57         char                    *p;
  58         const char              *plim;
  59         char                     filename[PATH_MAX];
  60         struct stat              st;
  61         size_t                   namesize;
  62         size_t                   bufsize;
  63         int                      save_using_locale;
  64         char *nptr;
  65
  66         save_using_locale = *using_locale;
  67         *using_locale = 0;
  68
  69         if (name == NULL)
  70                 goto no_locale;
  71
  72         if (!strcmp(name, "C") || !strcmp(name, "POSIX"))
  73                 return 0;
  74
  75         /*
  76          * If the locale name is the same as our cache, use the cache.
  77          */
  78         lbuf = locale_buf;
  79         if (lbuf != NULL && strcmp(name, lbuf) == 0) {
  80                 set_from_buf(lbuf, num_lines, dst_localebuf);
  81                 *using_locale = 1;
  82                 return 0;
  83         }
  84
  85         /*
  86          * Slurp the locale file into the cache.
  87          */
  88         namesize = strlen(name) + 1;
  89
  90         if (!_PathLocale)
  91                 goto no_locale;
  92         /* Range checking not needed, 'name' size is limited */
  93         strcpy(filename, _PathLocale);
  94         strcat(filename, "/");
  95         strcat(filename, name);
  96         strcat(filename, "/");
  97         strcat(filename, category_filename);
  98         fd = open(filename, O_RDONLY);
  99         if (fd < 0)
 100                 goto no_locale;
 101 #ifdef __USE_INTERNAL_STAT64
 102         if (fstat64(fd, &st) != 0)
 103 #else
 104         if (fstat(fd, &st) != 0)
 105 #endif
 106                 goto bad_locale;
 107         if (st.st_size <= 0)
 108                 goto bad_locale;
 109         bufsize = namesize + st.st_size;
 110         locale_buf = NULL;
 111
 112         if (lbuf == NULL || lbuf == locale_buf_C)
 113           {
 114             lbuf = malloc(bufsize);
 115           }
 116         else
 117           {
 118             nptr = realloc(lbuf, bufsize);
 119             if (!nptr && lbuf)
 120               free (lbuf);
 121             lbuf = nptr;
 122           }
 123
 124         if (lbuf == NULL)
 125                 goto bad_locale;
 126         (void) strcpy(lbuf, name);
 127         p = lbuf + namesize;
 128         plim = p + st.st_size;
 129         if (read(fd, p, (size_t) st.st_size) != st.st_size)
 130                 goto bad_lbuf;
 131         if (close(fd) != 0)
 132                 goto bad_lbuf;
 133         /*
 134          * Parse the locale file into localebuf.
 135          */
 136         if (plim[-1] != '\n')
 137                 goto bad_lbuf;
 138         num_lines = split_lines(p, plim);
 139         if (num_lines >= locale_buf_size_max)
 140                 num_lines = locale_buf_size_max;
 141         else if (num_lines >= locale_buf_size_min)
 142                 num_lines = locale_buf_size_min;
 143         else
 144                 goto reset_locale;
 145         set_from_buf(lbuf, num_lines, dst_localebuf);
 146         /*
 147          * Record the successful parse in the cache.
 148          */
 149         locale_buf = lbuf;
 150
 151         *using_locale = 1;
 152         return 0;
 153
 154 reset_locale:
 155         locale_buf = locale_buf_C;
 156         save_using_locale = 0;
 157 bad_lbuf:
 158         free(lbuf);
 159 bad_locale:
 160         (void)close(fd);
 161 no_locale:
 162         *using_locale = save_using_locale;
 163         return -1;
 164 }
 165
 166 static int
 167 split_lines(char *p, const char *plim) {
 168
 169         int i;
 170
 171         for (i = 0; p < plim; i++) {
 172                 p = strchr(p, '\n');
 173                 *p++ = '\0';
 174         }
 175         return i;
 176 }
 177
 178 static void
 179 set_from_buf(const char *p, int num_lines, const char **dst_localebuf) {
 180
 181         const char **ap;
 182         int i;
 183
 184         for (ap = dst_localebuf, i = 0; i < num_lines; ++ap, ++i)
 185                 *ap = p += strlen(p) + 1;
 186 }
 187