Annotation of src/lib/libintl/gettext_iconv.c, Revision 1.8
1.8 ! yamt 1: /* $NetBSD: gettext_iconv.c,v 1.7 2004/08/02 13:38:21 tshiozak Exp $ */
1.1 yamt 2:
3: /*-
4: * Copyright (c) 2004 Citrus Project,
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: * $Citrus$
29: */
30:
31:
32: #include <sys/types.h>
33: #include <sys/param.h>
34:
35: #include <errno.h>
36: #include <iconv.h>
37: #include <libintl.h>
38: #include <langinfo.h>
39: #include <search.h>
40: #include <stdlib.h>
41: #include <string.h>
42:
43: #include "libintl_local.h"
44:
45: struct cache {
46: const char *c_origmsg;
47: const char *c_resultmsg;
48: };
49:
50: static const struct cache *cache_find(const char *, struct domainbinding *);
51: static int cache_enter(const char *, const char *);
52: static int cache_cmp(const void *, const void *);
53:
54: static void *cacheroot;
55:
1.3 yamt 56: /* ARGSUSED1 */
1.1 yamt 57: static const struct cache *
58: cache_find(const char *msg, struct domainbinding *db)
59: {
60: struct cache key;
61: struct cache **c;
62:
63: key.c_origmsg = msg;
64: c = tfind(&key, &cacheroot, cache_cmp);
65:
66: return c ? *c : NULL;
67: }
68:
69: static int
70: cache_enter(const char *origmsg, const char *resultmsg)
71: {
72: struct cache *c;
73:
74: c = malloc(sizeof(*c));
75: if (c == NULL)
76: return -1;
77:
78: c->c_origmsg = origmsg;
79: c->c_resultmsg = resultmsg;
80:
81: if (tsearch(c, &cacheroot, cache_cmp) == NULL) {
82: free(c);
83: return -1;
84: }
85:
86: return 0;
87: }
88:
89: static int
90: cache_cmp(const void *va, const void *vb)
91: {
92: const struct cache *a = va;
93: const struct cache *b = vb;
94: int result;
95:
1.8 ! yamt 96: if (a->c_origmsg > b->c_origmsg) {
! 97: result = 1;
! 98: } else if (a->c_origmsg < b->c_origmsg) {
! 99: result = -1;
! 100: } else {
! 101: result = 0;
! 102: }
1.1 yamt 103:
104: return result;
105: }
106:
1.5 uebayasi 107: #define GETTEXT_ICONV_MALLOC_CHUNK (16 * 1024)
1.1 yamt 108:
109: const char *
110: __gettext_iconv(const char *origmsg, struct domainbinding *db)
111: {
112: const char *tocode;
113: const char *fromcode = db->mohandle.mo.mo_charset;
114: const struct cache *cache;
115: const char *result;
116: iconv_t cd;
117: const char *src;
118: char *dst;
119: size_t origlen;
120: size_t srclen;
121: size_t dstlen;
122: size_t nvalid;
123: int savederrno = errno;
124:
1.2 yamt 125: /*
126: * static buffer for converted texts.
127: *
128: * note:
129: * we never free buffers once returned to callers.
130: * because of interface design of gettext, we can't know
131: * the lifetime of them.
132: */
1.1 yamt 133: static char *buffer;
134: static size_t bufferlen;
135:
1.5 uebayasi 136: /*
137: * don't convert message if *.mo doesn't specify codeset.
138: */
139: if (fromcode == NULL)
140: return origmsg;
141:
1.1 yamt 142: tocode = db->codeset;
143: if (tocode == NULL) {
144: /*
1.2 yamt 145: * codeset isn't specified explicitly by
146: * bind_textdomain_codeset().
1.4 yamt 147: * use current locale(LC_CTYPE)'s codeset.
1.1 yamt 148: *
149: * XXX maybe wrong; it can mismatch with
150: * environment variable setting.
151: */
152: tocode = nl_langinfo(CODESET);
153: }
154:
155: /*
156: * shortcut if possible.
157: * XXX should handle aliases
158: */
159: if (!strcasecmp(tocode, fromcode))
160: return origmsg;
161:
162: /* XXX LOCK */
163:
164: /* XXX should detect change of tocode and purge caches? */
165:
166: /*
167: * see if we have already converted this message.
168: */
169: cache = cache_find(origmsg, db);
170: if (cache) {
171: result = cache->c_resultmsg;
172: goto out;
173: }
174:
175: origlen = strlen(origmsg) + 1;
176: again:
177: cd = iconv_open(tocode, fromcode);
178: if (cd == (iconv_t)-1) {
179: result = origmsg;
180: goto out;
181: }
182:
183: src = origmsg;
184: srclen = origlen;
185: dst = buffer;
186: dstlen = bufferlen;
1.7 tshiozak 187: nvalid = iconv(cd, &src, &srclen, &dst, &dstlen);
1.1 yamt 188: iconv_close(cd);
189:
190: if (nvalid == (size_t)-1) {
191: /*
192: * try to allocate a new buffer.
193: *
194: * just give up if GETTEXT_ICONV_MALLOC_CHUNK was not enough.
195: */
196: if (errno == E2BIG &&
197: bufferlen != GETTEXT_ICONV_MALLOC_CHUNK) {
198: buffer = malloc(GETTEXT_ICONV_MALLOC_CHUNK);
199: if (buffer) {
200: bufferlen = GETTEXT_ICONV_MALLOC_CHUNK;
201: goto again;
202: }
203: }
204:
205: result = origmsg;
206: } else if (cache_enter(origmsg, buffer)) {
207: /*
208: * failed to enter cache. give up.
209: */
210: result = origmsg;
211: } else {
212: size_t resultlen = dst - buffer;
213:
214: result = buffer;
215: bufferlen -= resultlen;
216: buffer += resultlen;
217: }
218:
219: out:
220: /* XXX UNLOCK */
221: errno = savederrno;
222:
223: return result;
224: }
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