ldpart.c revision 72331
1/* 2 * Copyright (c) 2000, 2001 Alexey Zelkin 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 72331 2001-02-10 19:57:26Z phantom $ 27 */ 28 29#include "namespace.h" 30#include <sys/types.h> 31#include <sys/stat.h> 32#include <sys/syslimits.h> 33#include <fcntl.h> 34#include "un-namespace.h" 35#include <stdlib.h> 36#include <string.h> 37#include "setlocale.h" 38#include "ldpart.h" 39 40static int split_lines(char *, const char *); 41static void set_from_buf(const char *, int, const char **); 42 43int 44__part_load_locale(const char *name, 45 int* using_locale, 46 char *locale_buf, 47 const char *category_name, 48 int locale_buf_size, 49 const char **dst_localebuf) { 50 51 static char locale_buf_C[] = "C"; 52 static int num_lines; 53 54 int fd; 55 char * lbuf; 56 char * p; 57 const char * plim; 58 char filename[PATH_MAX]; 59 struct stat st; 60 size_t namesize; 61 size_t bufsize; 62 int save_using_locale; 63 64 save_using_locale = *using_locale; 65 *using_locale = 0; 66 67 if (name == NULL) 68 goto no_locale; 69 70 if (!strcmp(name, "C") || !strcmp(name, "POSIX")) 71 return 0; 72 73 /* 74 ** If the locale name is the same as our cache, use the cache. 75 */ 76 lbuf = locale_buf; 77 if (lbuf != NULL && strcmp(name, lbuf) == 0) { 78 set_from_buf(lbuf, num_lines, dst_localebuf); 79 *using_locale = 1; 80 return 0; 81 } 82 /* 83 ** Slurp the locale file into the cache. 84 */ 85 namesize = strlen(name) + 1; 86 87 if (!_PathLocale) 88 goto no_locale; 89 /* Range checking not needed, 'name' size is limited */ 90 strcpy(filename, _PathLocale); 91 strcat(filename, "/"); 92 strcat(filename, name); 93 strcat(filename, "/"); 94 strcat(filename, category_name); 95 fd = _open(filename, O_RDONLY); 96 if (fd < 0) 97 goto no_locale; 98 if (fstat(fd, &st) != 0) 99 goto bad_locale; 100 if (st.st_size <= 0) 101 goto bad_locale; 102 bufsize = namesize + st.st_size; 103 locale_buf = NULL; 104 lbuf = (lbuf == NULL || lbuf == locale_buf_C) ? 105 malloc(bufsize) : reallocf(lbuf, bufsize); 106 if (lbuf == NULL) 107 goto bad_locale; 108 (void) strcpy(lbuf, name); 109 p = lbuf + namesize; 110 plim = p + st.st_size; 111 if (_read(fd, p, (size_t) st.st_size) != st.st_size) 112 goto bad_lbuf; 113 if (_close(fd) != 0) 114 goto bad_lbuf; 115 /* 116 ** Parse the locale file into localebuf. 117 */ 118 if (plim[-1] != '\n') 119 goto bad_lbuf; 120 num_lines = split_lines(p, plim); 121 if (num_lines >= locale_buf_size) 122 num_lines = locale_buf_size; 123 else 124 goto reset_locale; 125 set_from_buf(lbuf, num_lines, dst_localebuf); 126 /* 127 ** Record the successful parse in the cache. 128 */ 129 locale_buf = lbuf; 130 131 *using_locale = 1; 132 return 0; 133 134reset_locale: 135 locale_buf = locale_buf_C; 136 save_using_locale = 0; 137bad_lbuf: 138 free(lbuf); 139bad_locale: 140 (void)_close(fd); 141no_locale: 142 *using_locale = save_using_locale; 143 return -1; 144} 145 146static int 147split_lines(char *p, const char *plim) 148{ 149 int i; 150 151 for (i = 0; p < plim; i++) { 152 p = strchr(p, '\n'); 153 *p++ = '\0'; 154 } 155 return i; 156} 157 158static void 159set_from_buf(const char *p, int num_lines, const char **dst_localebuf) 160{ 161 const char **ap; 162 int i; 163 164 for (ap = dst_localebuf, i = 0; i < num_lines; ++ap, ++i) 165 *ap = p += strlen(p) + 1; 166} 167 168