Repository copy libkern/{Makefile,iconv*} -> libiconv, and modify the
[dragonfly.git] / sys / libiconv / iconv.c
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984263bc
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1/*
2 * Copyright (c) 2000-2001, Boris Popov
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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: src/sys/libkern/iconv.c,v 1.1.2.1 2001/05/21 08:28:07 bp Exp $
678a32ed 33 * $DragonFly: src/sys/libiconv/iconv.c,v 1.3 2004/03/18 18:27:47 dillon Exp $
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34 */
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/kernel.h>
38#include <sys/iconv.h>
39#include <sys/malloc.h>
40
41#include "iconv_converter_if.h"
42
43SYSCTL_DECL(_kern_iconv);
44
45SYSCTL_NODE(_kern, OID_AUTO, iconv, CTLFLAG_RW, NULL, "kernel iconv interface");
46
47MALLOC_DEFINE(M_ICONV, "ICONV", "ICONV structures");
48MALLOC_DEFINE(M_ICONVDATA, "ICONV data", "ICONV data");
49
50MODULE_VERSION(libiconv, 1);
51
52#ifdef notnow
53/*
54 * iconv converter instance
55 */
56struct iconv_converter {
57 KOBJ_FIELDS;
58 void * c_data;
59};
60#endif
61
62struct sysctl_oid *iconv_oid_hook = &sysctl___kern_iconv;
63
64/*
65 * List of loaded converters
66 */
67static TAILQ_HEAD(iconv_converter_list, iconv_converter_class)
68 iconv_converters = TAILQ_HEAD_INITIALIZER(iconv_converters);
69
70/*
71 * List of supported/loaded charsets pairs
72 */
73static TAILQ_HEAD(, iconv_cspair)
74 iconv_cslist = TAILQ_HEAD_INITIALIZER(iconv_cslist);
75static int iconv_csid = 1;
76
77static char iconv_unicode_string[] = "unicode"; /* save eight bytes when possible */
78
79static void iconv_unregister_cspair(struct iconv_cspair *csp);
80
81static int
82iconv_mod_unload(void)
83{
84 struct iconv_cspair *csp;
85
86 while ((csp = TAILQ_FIRST(&iconv_cslist)) != NULL) {
87 if (csp->cp_refcount)
88 return EBUSY;
89 iconv_unregister_cspair(csp);
90 }
91 return 0;
92}
93
94static int
95iconv_mod_handler(module_t mod, int type, void *data)
96{
97 int error;
98
99 switch (type) {
100 case MOD_LOAD:
101 error = 0;
102 break;
103 case MOD_UNLOAD:
104 error = iconv_mod_unload();
105 break;
106 default:
107 error = EINVAL;
108 }
109 return error;
110}
111
112static moduledata_t iconv_mod = {
113 "iconv", iconv_mod_handler, NULL
114};
115
116DECLARE_MODULE(iconv, iconv_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
117
118static int
119iconv_register_converter(struct iconv_converter_class *dcp)
120{
121 kobj_class_compile((struct kobj_class*)dcp);
122 dcp->refs++;
123 TAILQ_INSERT_TAIL(&iconv_converters, dcp, cc_link);
124 return 0;
125}
126
127static int
128iconv_unregister_converter(struct iconv_converter_class *dcp)
129{
130 if (dcp->refs > 1) {
131 ICDEBUG("converter have %d referenses left\n", dcp->refs);
132 return EBUSY;
133 }
134 TAILQ_REMOVE(&iconv_converters, dcp, cc_link);
135 kobj_class_free((struct kobj_class*)dcp);
136 return 0;
137}
138
139static int
140iconv_lookupconv(const char *name, struct iconv_converter_class **dcpp)
141{
142 struct iconv_converter_class *dcp;
143
144 TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
145 if (name == NULL)
146 continue;
147 if (strcmp(name, ICONV_CONVERTER_NAME(dcp)) == 0) {
148 if (dcpp)
149 *dcpp = dcp;
150 return 0;
151 }
152 }
153 return ENOENT;
154}
155
156static int
157iconv_lookupcs(const char *to, const char *from, struct iconv_cspair **cspp)
158{
159 struct iconv_cspair *csp;
160
161 TAILQ_FOREACH(csp, &iconv_cslist, cp_link) {
162 if (strcmp(csp->cp_to, to) == 0 &&
163 strcmp(csp->cp_from, from) == 0) {
164 if (cspp)
165 *cspp = csp;
166 return 0;
167 }
168 }
169 return ENOENT;
170}
171
172static int
173iconv_register_cspair(const char *to, const char *from,
174 struct iconv_converter_class *dcp, void *data,
175 struct iconv_cspair **cspp)
176{
177 struct iconv_cspair *csp;
178 char *cp;
179 int csize, ucsto, ucsfrom;
180
181 if (iconv_lookupcs(to, from, NULL) == 0)
182 return EEXIST;
183 csize = sizeof(*csp);
184 ucsto = strcmp(to, iconv_unicode_string) == 0;
185 if (!ucsto)
186 csize += strlen(to) + 1;
187 ucsfrom = strcmp(from, iconv_unicode_string) == 0;
188 if (!ucsfrom)
189 csize += strlen(from) + 1;
190 csp = malloc(csize, M_ICONV, M_WAITOK);
191 bzero(csp, csize);
192 csp->cp_id = iconv_csid++;
193 csp->cp_dcp = dcp;
194 cp = (char*)(csp + 1);
195 if (!ucsto) {
196 strcpy(cp, to);
197 csp->cp_to = cp;
198 cp += strlen(cp) + 1;
199 } else
200 csp->cp_to = iconv_unicode_string;
201 if (!ucsfrom) {
202 strcpy(cp, from);
203 csp->cp_from = cp;
204 } else
205 csp->cp_from = iconv_unicode_string;
206 csp->cp_data = data;
207
208 TAILQ_INSERT_TAIL(&iconv_cslist, csp, cp_link);
209 *cspp = csp;
210 return 0;
211}
212
213static void
214iconv_unregister_cspair(struct iconv_cspair *csp)
215{
216 TAILQ_REMOVE(&iconv_cslist, csp, cp_link);
217 if (csp->cp_data)
218 free(csp->cp_data, M_ICONVDATA);
219 free(csp, M_ICONV);
220}
221
222/*
223 * Lookup and create an instance of converter.
224 * Currently this layer didn't have associated 'instance' structure
225 * to avoid unnesessary memory allocation.
226 */
227int
228iconv_open(const char *to, const char *from, void **handle)
229{
230 struct iconv_cspair *csp, *cspfrom, *cspto;
231 struct iconv_converter_class *dcp;
232 const char *cnvname;
233 int error;
234
235 /*
236 * First, lookup fully qualified cspairs
237 */
238 error = iconv_lookupcs(to, from, &csp);
239 if (error == 0)
240 return ICONV_CONVERTER_OPEN(csp->cp_dcp, csp, NULL, handle);
241
242 /*
243 * Well, nothing found. Now try to construct a composite conversion
244 * ToDo: add a 'capability' field to converter
245 */
246 TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
247 cnvname = ICONV_CONVERTER_NAME(dcp);
248 if (cnvname == NULL)
249 continue;
250 error = iconv_lookupcs(cnvname, from, &cspfrom);
251 if (error)
252 continue;
253 error = iconv_lookupcs(to, cnvname, &cspto);
254 if (error)
255 continue;
256 /*
257 * Fine, we're found a pair which can be combined together
258 */
259 return ICONV_CONVERTER_OPEN(dcp, cspto, cspfrom, handle);
260 }
261 return ENOENT;
262}
263
264int
265iconv_close(void *handle)
266{
267 return ICONV_CONVERTER_CLOSE(handle);
268}
269
270int
271iconv_conv(void *handle, const char **inbuf,
272 size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
273{
274 return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft);
275}
276
277/*
278 * Give a list of loaded converters. Each name terminated with 0.
279 * An empty string terminates the list.
280 */
281static int
282iconv_sysctl_drvlist(SYSCTL_HANDLER_ARGS)
283{
284 struct iconv_converter_class *dcp;
285 const char *name;
286 char spc;
287 int error;
288
289 error = 0;
290
291 TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
292 name = ICONV_CONVERTER_NAME(dcp);
293 if (name == NULL)
294 continue;
295 error = SYSCTL_OUT(req, name, strlen(name) + 1);
296 if (error)
297 break;
298 }
299 if (error)
300 return error;
301 spc = 0;
302 error = SYSCTL_OUT(req, &spc, sizeof(spc));
303 return error;
304}
305
306SYSCTL_PROC(_kern_iconv, OID_AUTO, drvlist, CTLFLAG_RD | CTLTYPE_OPAQUE,
307 NULL, 0, iconv_sysctl_drvlist, "S,xlat", "registered converters");
308
309/*
310 * List all available charset pairs.
311 */
312static int
313iconv_sysctl_cslist(SYSCTL_HANDLER_ARGS)
314{
315 struct iconv_cspair *csp;
316 struct iconv_cspair_info csi;
317 int error;
318
319 error = 0;
320 bzero(&csi, sizeof(csi));
321 csi.cs_version = ICONV_CSPAIR_INFO_VER;
322
323 TAILQ_FOREACH(csp, &iconv_cslist, cp_link) {
324 csi.cs_id = csp->cp_id;
325 csi.cs_refcount = csp->cp_refcount;
326 csi.cs_base = csp->cp_base ? csp->cp_base->cp_id : 0;
327 strcpy(csi.cs_to, csp->cp_to);
328 strcpy(csi.cs_from, csp->cp_from);
329 error = SYSCTL_OUT(req, &csi, sizeof(csi));
330 if (error)
331 break;
332 }
333 return error;
334}
335
336SYSCTL_PROC(_kern_iconv, OID_AUTO, cslist, CTLFLAG_RD | CTLTYPE_OPAQUE,
337 NULL, 0, iconv_sysctl_cslist, "S,xlat", "registered charset pairs");
338
339/*
340 * Add new charset pair
341 */
342static int
343iconv_sysctl_add(SYSCTL_HANDLER_ARGS)
344{
345 struct iconv_converter_class *dcp;
346 struct iconv_cspair *csp;
347 struct iconv_add_in din;
348 struct iconv_add_out dout;
349 int error;
350
351 error = SYSCTL_IN(req, &din, sizeof(din));
352 if (error)
353 return error;
354 if (din.ia_version != ICONV_ADD_VER)
355 return EINVAL;
356 if (din.ia_datalen > ICONV_CSMAXDATALEN)
357 return EINVAL;
358 if (iconv_lookupconv(din.ia_converter, &dcp) != 0)
359 return EINVAL;
360 error = iconv_register_cspair(din.ia_to, din.ia_from, dcp, NULL, &csp);
361 if (error)
362 return error;
363 if (din.ia_datalen) {
364 csp->cp_data = malloc(din.ia_datalen, M_ICONVDATA, M_WAITOK);
365 error = copyin(din.ia_data, csp->cp_data, din.ia_datalen);
366 if (error)
367 goto bad;
368 }
369 dout.ia_csid = csp->cp_id;
370 error = SYSCTL_OUT(req, &dout, sizeof(dout));
371 if (error)
372 goto bad;
373 return 0;
374bad:
375 iconv_unregister_cspair(csp);
376 return error;
377}
378
379SYSCTL_PROC(_kern_iconv, OID_AUTO, add, CTLFLAG_RW | CTLTYPE_OPAQUE,
380 NULL, 0, iconv_sysctl_add, "S,xlat", "register charset pair");
381
382/*
383 * Default stubs for converters
384 */
385int
386iconv_converter_initstub(struct iconv_converter_class *dp)
387{
388 return 0;
389}
390
391int
392iconv_converter_donestub(struct iconv_converter_class *dp)
393{
394 return 0;
395}
396
397int
398iconv_converter_handler(module_t mod, int type, void *data)
399{
400 struct iconv_converter_class *dcp = data;
401 int error;
402
403 switch (type) {
404 case MOD_LOAD:
405 error = iconv_register_converter(dcp);
406 if (error)
407 break;
408 error = ICONV_CONVERTER_INIT(dcp);
409 if (error)
410 iconv_unregister_converter(dcp);
411 break;
412 case MOD_UNLOAD:
413 ICONV_CONVERTER_DONE(dcp);
414 error = iconv_unregister_converter(dcp);
415 break;
416 default:
417 error = EINVAL;
418 }
419 return error;
420}
421
422/*
423 * Common used functions
424 */
425char *
426iconv_convstr(void *handle, char *dst, const char *src)
427{
428 char *p = dst;
429 int inlen, outlen, error;
430
431 if (handle == NULL) {
432 strcpy(dst, src);
433 return dst;
434 }
435 inlen = outlen = strlen(src);
436 error = iconv_conv(handle, NULL, NULL, &p, &outlen);
437 if (error)
438 return NULL;
439 error = iconv_conv(handle, &src, &inlen, &p, &outlen);
440 if (error)
441 return NULL;
442 *p = 0;
443 return dst;
444}
445
446void *
447iconv_convmem(void *handle, void *dst, const void *src, int size)
448{
449 const char *s = src;
450 char *d = dst;
451 int inlen, outlen, error;
452
453 if (size == 0)
454 return dst;
455 if (handle == NULL) {
456 memcpy(dst, src, size);
457 return dst;
458 }
459 inlen = outlen = size;
460 error = iconv_conv(handle, NULL, NULL, &d, &outlen);
461 if (error)
462 return NULL;
463 error = iconv_conv(handle, &s, &inlen, &d, &outlen);
464 if (error)
465 return NULL;
466 return dst;
467}
468
469int
470iconv_lookupcp(char **cpp, const char *s)
471{
472 if (cpp == NULL) {
473 ICDEBUG("warning a NULL list passed\n");
474 return ENOENT;
475 }
476 for (; *cpp; cpp++)
477 if (strcmp(*cpp, s) == 0)
478 return 0;
479 return ENOENT;
480}