xref: /dragonfly/lib/libc/locale/collate.c (revision 2ee85085) 
1 /*-
2  * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
3  *		at Electronni Visti IA, Kiev, Ukraine.
4  *			All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  *
27  * $FreeBSD: src/lib/libc/locale/collate.c,v 1.21.2.4 2002/10/11 10:36:47 ache Exp $
28  * $DragonFly: src/lib/libc/locale/collate.c,v 1.6 2005/04/21 16:36:34 joerg Exp $
29  */
30 
31 #include "namespace.h"
32 #include <arpa/inet.h>
33 #include <rune.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <errno.h>
38 #include <unistd.h>
39 #include <sysexits.h>
40 #include "un-namespace.h"
41 
42 #include "collate.h"
43 
44 #define	ENCODING_LEN	31
45 #define _LDP_LOADED 0
46 #define _LDP_ERROR  (-1)
47 #define _LDP_CACHE  1
48 
49 int __collate_load_error = 1;
50 int __collate_substitute_nontrivial;
51 
52 u_char __collate_substitute_table[UCHAR_MAX + 1][STR_LEN];
53 struct __collate_st_char_pri __collate_char_pri_table[UCHAR_MAX + 1];
54 struct __collate_st_chain_pri *__collate_chain_pri_table;
55 
56 void __collate_err(int ex, const char *f) __dead2;
57 
58 int
59 __collate_load_tables(const char *encoding)
60 {
61 	FILE *fp;
62 	int i, saverr, chains;
63 	uint32_t u32;
64 	char strbuf[STR_LEN], buf[PATH_MAX];
65 	void *TMP_substitute_table, *TMP_char_pri_table, *TMP_chain_pri_table;
66 	static char collate_encoding[ENCODING_LEN + 1];
67 
68 	/* 'encoding' must be already checked. */
69 	if (strcmp(encoding, "C") == 0 || strcmp(encoding, "POSIX") == 0) {
70 		__collate_load_error = 1;
71 		return (_LDP_CACHE);
72 	}
73 
74 	/*
75 	 * If the locale name is the same as our cache, use the cache.
76 	 */
77 	if (strcmp(encoding, collate_encoding) == 0) {
78 		__collate_load_error = 0;
79 		return (_LDP_CACHE);
80 	}
81 
82 	/*
83 	 * Slurp the locale file into the cache.
84 	 */
85 
86 	/* 'PathLocale' must be already set & checked. */
87 	/* Range checking not needed, encoding has fixed size */
88 	(void)strcpy(buf, _PathLocale);
89 	(void)strcat(buf, "/");
90 	(void)strcat(buf, encoding);
91 	(void)strcat(buf, "/LC_COLLATE");
92 	if ((fp = fopen(buf, "r")) == NULL)
93 		return (_LDP_ERROR);
94 
95 	if (fread(strbuf, sizeof(strbuf), 1, fp) != 1) {
96 		saverr = errno;
97 		(void)fclose(fp);
98 		errno = saverr;
99 		return (_LDP_ERROR);
100 	}
101 	chains = -1;
102 	if (strcmp(strbuf, COLLATE_VERSION) == 0)
103 		chains = 0;
104 	else if (strcmp(strbuf, COLLATE_VERSION1_1) == 0)
105 		chains = 1;
106 	if (chains < 0) {
107 		(void)fclose(fp);
108 		errno = EFTYPE;
109 		return (_LDP_ERROR);
110 	}
111 	if (chains) {
112 		if (fread(&u32, sizeof(u32), 1, fp) != 1) {
113 			saverr = errno;
114 			(void)fclose(fp);
115 			errno = saverr;
116 			return (_LDP_ERROR);
117 		}
118 		if ((chains = (int)ntohl(u32)) < 1) {
119 			(void)fclose(fp);
120 			errno = EFTYPE;
121 			return (_LDP_ERROR);
122 		}
123 	} else
124 		chains = TABLE_SIZE;
125 
126 	if ((TMP_substitute_table =
127 	     malloc(sizeof(__collate_substitute_table))) == NULL) {
128 		saverr = errno;
129 		(void)fclose(fp);
130 		errno = saverr;
131 		return (_LDP_ERROR);
132 	}
133 	if ((TMP_char_pri_table =
134 	     malloc(sizeof(__collate_char_pri_table))) == NULL) {
135 		saverr = errno;
136 		free(TMP_substitute_table);
137 		(void)fclose(fp);
138 		errno = saverr;
139 		return (_LDP_ERROR);
140 	}
141 	if ((TMP_chain_pri_table =
142 	     malloc(sizeof(*__collate_chain_pri_table) * chains)) == NULL) {
143 		saverr = errno;
144 		free(TMP_substitute_table);
145 		free(TMP_char_pri_table);
146 		(void)fclose(fp);
147 		errno = saverr;
148 		return (_LDP_ERROR);
149 	}
150 
151 #define FREAD(a, b, c, d) \
152 { \
153 	if ( fread(a, b, c, d) != c) { \
154 		saverr = errno; \
155 		free(TMP_substitute_table); \
156 		free(TMP_char_pri_table); \
157 		free(TMP_chain_pri_table); \
158 		(void)fclose(d); \
159 		errno = saverr; \
160 		return (_LDP_ERROR); \
161 	} \
162 }
163 
164 	FREAD(TMP_substitute_table, sizeof(__collate_substitute_table), 1, fp);
165 	FREAD(TMP_char_pri_table, sizeof(__collate_char_pri_table), 1, fp);
166 	FREAD(TMP_chain_pri_table,
167 	      sizeof(*__collate_chain_pri_table), chains, fp);
168 	(void)fclose(fp);
169 
170 	(void)strcpy(collate_encoding, encoding);
171 	if (__collate_substitute_table_ptr != NULL)
172 		free(__collate_substitute_table_ptr);
173 	__collate_substitute_table_ptr = TMP_substitute_table;
174 	if (__collate_char_pri_table_ptr != NULL)
175 		free(__collate_char_pri_table_ptr);
176 	__collate_char_pri_table_ptr = TMP_char_pri_table;
177 	if (__collate_chain_pri_table != NULL)
178 		free(__collate_chain_pri_table);
179 	__collate_chain_pri_table = TMP_chain_pri_table;
180 
181 	__collate_substitute_nontrivial = 0;
182 	for (i = 0; i < UCHAR_MAX + 1; i++) {
183 		if (__collate_substitute_table[i][0] != i ||
184 		    __collate_substitute_table[i][1] != 0) {
185 			__collate_substitute_nontrivial = 1;
186 			break;
187 		}
188 	}
189 	__collate_load_error = 0;
190 
191 	return (_LDP_LOADED);
192 }
193 
194 u_char *
195 __collate_substitute(s)
196 	const u_char *s;
197 {
198 	int dest_len, len, nlen;
199 	int delta = strlen(s);
200 	u_char *dest_str = NULL;
201 
202 	if (s == NULL || *s == '\0')
203 		return (__collate_strdup(""));
204 	delta += delta / 8;
205 	dest_str = malloc(dest_len = delta);
206 	if (dest_str == NULL)
207 		__collate_err(EX_OSERR, __func__);
208 	len = 0;
209 	while (*s) {
210 		nlen = len + strlen(__collate_substitute_table[*s]);
211 		if (dest_len <= nlen) {
212 			dest_str = reallocf(dest_str, dest_len = nlen + delta);
213 			if (dest_str == NULL)
214 				__collate_err(EX_OSERR, __func__);
215 		}
216 		(void)strcpy(dest_str + len, __collate_substitute_table[*s++]);
217 		len = nlen;
218 	}
219 	return (dest_str);
220 }
221 
222 void
223 __collate_lookup(t, len, prim, sec)
224 	const u_char *t;
225 	int *len, *prim, *sec;
226 {
227 	struct __collate_st_chain_pri *p2;
228 
229 	*len = 1;
230 	*prim = *sec = 0;
231 	for (p2 = __collate_chain_pri_table; p2->str[0] != '\0'; p2++) {
232 		if (*t == p2->str[0] &&
233 		    strncmp(t, p2->str, strlen(p2->str)) == 0) {
234 			*len = strlen(p2->str);
235 			*prim = p2->prim;
236 			*sec = p2->sec;
237 			return;
238 		}
239 	}
240 	*prim = __collate_char_pri_table[*t].prim;
241 	*sec = __collate_char_pri_table[*t].sec;
242 }
243 
244 u_char *
245 __collate_strdup(s)
246 	u_char *s;
247 {
248 	u_char *t = strdup(s);
249 
250 	if (t == NULL)
251 		__collate_err(EX_OSERR, __func__);
252 	return (t);
253 }
254 
255 void
256 __collate_err(int ex, const char *f)
257 {
258 	const char *progname;
259 	int serrno = errno;
260 
261 	progname = getprogname();
262 	_write(STDERR_FILENO, progname, strlen(progname));
263 	_write(STDERR_FILENO, ": ", 2);
264 	_write(STDERR_FILENO, f, strlen(f));
265 	_write(STDERR_FILENO, ": ", 2);
266 	f = strerror(serrno);
267 	_write(STDERR_FILENO, f, strlen(f));
268 	_write(STDERR_FILENO, "\n", 1);
269 	exit(ex);
270 }
271 
272 #ifdef COLLATE_DEBUG
273 void
274 __collate_print_tables()
275 {
276 	int i;
277 	struct __collate_st_chain_pri *p2;
278 
279 	printf("Substitute table:\n");
280 	for (i = 0; i < UCHAR_MAX + 1; i++)
281 	    if (i != *__collate_substitute_table[i])
282 		printf("\t'%c' --> \"%s\"\n", i,
283 		       __collate_substitute_table[i]);
284 	printf("Chain priority table:\n");
285 	for (p2 = __collate_chain_pri_table; p2->str[0] != '\0'; p2++)
286 		printf("\t\"%s\" : %d %d\n", p2->str, p2->prim, p2->sec);
287 	printf("Char priority table:\n");
288 	for (i = 0; i < UCHAR_MAX + 1; i++)
289 		printf("\t'%c' : %d %d\n", i, __collate_char_pri_table[i].prim,
290 		       __collate_char_pri_table[i].sec);
291 }
292 #endif
293