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

   1 /*
   2  * Copyright 2013 Garrett D'Amore <garrett@damore.org>
   3  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
   4  * Copyright (c) 2000, 2001 Alexey Zelkin <phantom@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
  29 #include "lint.h"
  30 #include "file64.h"
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <errno.h>
  34 #include <fcntl.h>
  35 #include <limits.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <unistd.h>
  39 #include <stdio.h>
  40
  41 #include "libc.h"
  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     char **locale_buf, const char *category_filename,
  50     int locale_buf_size_max, int locale_buf_size_min,
  51     const char **dst_localebuf)
  52 {
  53         int             saverr, fd, i, num_lines;
  54         char            *lbuf, *p;
  55         const char      *plim;
  56         char            filename[PATH_MAX];
  57         struct stat     st;
  58         size_t          namesize, bufsize;
  59
  60         /*
  61          * Slurp the locale file into the cache.
  62          */
  63         namesize = strlen(name) + 1;
  64
  65         /* 'PathLocale' must be already set & checked. */
  66
  67         (void) snprintf(filename, sizeof (filename), "%s/%s/%s/LCL_DATA",
  68             _PathLocale, name, category_filename);
  69
  70         if ((fd = open(filename, O_RDONLY)) < 0)
  71                 return (_LDP_ERROR);
  72         if (fstat(fd, &st) != 0)
  73                 goto bad_locale;
  74         if (st.st_size <= 0) {
  75                 errno = EINVAL;
  76                 goto bad_locale;
  77         }
  78         bufsize = namesize + st.st_size;
  79         if ((lbuf = libc_malloc(bufsize)) == NULL) {
  80                 errno = ENOMEM;
  81                 goto bad_locale;
  82         }
  83         (void) strcpy(lbuf, name);
  84         p = lbuf + namesize;
  85         plim = p + st.st_size;
  86         if (read(fd, p, (size_t)st.st_size) != st.st_size)
  87                 goto bad_lbuf;
  88         /*
  89          * Parse the locale file into localebuf.
  90          */
  91         if (plim[-1] != '\n') {
  92                 errno = EINVAL;
  93                 goto bad_lbuf;
  94         }
  95         num_lines = split_lines(p, plim);
  96         if (num_lines >= locale_buf_size_max)
  97                 num_lines = locale_buf_size_max;
  98         else if (num_lines >= locale_buf_size_min)
  99                 num_lines = locale_buf_size_min;
 100         else {
 101                 errno = EINVAL;
 102                 goto bad_lbuf;
 103         }
 104         (void) close(fd);
 105         /*
 106          * Record the successful parse in the cache.
 107          */
 108         *locale_buf = lbuf;
 109         for (p = *locale_buf, i = 0; i < num_lines; i++)
 110                 dst_localebuf[i] = (p += strlen(p) + 1);
 111         for (i = num_lines; i < locale_buf_size_max; i++)
 112                 dst_localebuf[i] = NULL;
 113
 114         return (_LDP_LOADED);
 115
 116 bad_lbuf:
 117         saverr = errno;
 118         free(lbuf);
 119         errno = saverr;
 120 bad_locale:
 121         saverr = errno;
 122         (void) close(fd);
 123         errno = saverr;
 124
 125         return (_LDP_ERROR);
 126 }
 127
 128 static int
 129 split_lines(char *p, const char *plim)
 130 {
 131         int i;
 132
 133         i = 0;
 134         while (p < plim) {
 135                 if (*p == '\n') {
 136                         *p = '\0';
 137                         i++;
 138                 }
 139                 p++;
 140         }
 141         return (i);
 142 }