source: branches/samba-3.3.x/source/lib/iconv.c@ 206

Last change on this file since 206 was 206, checked in by Herwig Bauernfeind, 16 years ago

Import Samba 3.3 branch at 3.0.0 level (psmedley's port)
File size: 18.3 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 minimal iconv implementation
4 Copyright (C) Andrew Tridgell 2001
5 Copyright (C) Jelmer Vernooij 2002,2003
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
19*/
20
21#include "includes.h"
22
23/*
24 * We have to use strcasecmp here as the character conversions
25 * haven't been initialised yet. JRA.
26 */
27
28#undef strcasecmp
29
30/**
31 * @file
32 *
33 * @brief Samba wrapper/stub for iconv character set conversion.
34 *
35 * iconv is the XPG2 interface for converting between character
36 * encodings. This file provides a Samba wrapper around it, and also
37 * a simple reimplementation that is used if the system does not
38 * implement iconv.
39 *
40 * Samba only works with encodings that are supersets of ASCII: ascii
41 * characters like whitespace can be tested for directly, multibyte
42 * sequences start with a byte with the high bit set, and strings are
43 * terminated by a nul byte.
44 *
45 * Note that the only function provided by iconv is conversion between
46 * characters. It doesn't directly support operations like
47 * uppercasing or comparison. We have to convert to UCS-2 and compare
48 * there.
49 *
50 * @sa Samba Developers Guide
51 **/
52
53static_decl_charset;
54
55static size_t ascii_pull(void *,const char **, size_t *, char **, size_t *);
56static size_t ascii_push(void *,const char **, size_t *, char **, size_t *);
57static size_t latin1_push(void *,const char **, size_t *, char **, size_t *);
58static size_t utf8_pull(void *,const char **, size_t *, char **, size_t *);
59static size_t utf8_push(void *,const char **, size_t *, char **, size_t *);
60static size_t ucs2hex_pull(void *,const char **, size_t *, char **, size_t *);
61static size_t ucs2hex_push(void *,const char **, size_t *, char **, size_t *);
62static size_t iconv_copy(void *,const char **, size_t *, char **, size_t *);
63static size_t iconv_swab (void *,const char **, size_t *, char **, size_t *);
64
65static struct charset_functions builtin_functions[] = {
66 /* windows is really neither UCS-2 not UTF-16 */
67 {"UCS-2LE", iconv_copy, iconv_copy},
68 {"UTF-16LE", iconv_copy, iconv_copy},
69 {"UCS-2BE", iconv_swab, iconv_swab},
70 {"UTF-16BE", iconv_swab, iconv_swab},
71
72 /* we include the UTF-8 alias to cope with differing locale settings */
73 {"UTF8", utf8_pull, utf8_push},
74 {"UTF-8", utf8_pull, utf8_push},
75 {"ASCII", ascii_pull, ascii_push},
76 {"646", ascii_pull, ascii_push},
77 {"ISO-8859-1", ascii_pull, latin1_push},
78 {"UCS2-HEX", ucs2hex_pull, ucs2hex_push},
79 {NULL, NULL, NULL}
80};
81
82static struct charset_functions *charsets = NULL;
83
84static struct charset_functions *find_charset_functions(const char *name)
85{
86 struct charset_functions *c = charsets;
87
88 while(c) {
89 if (strcasecmp(name, c->name) == 0) {
90 return c;
91 }
92 c = c->next;
93 }
94
95 return NULL;
96}
97
98NTSTATUS smb_register_charset(struct charset_functions *funcs)
99{
100 if (!funcs) {
101 return NT_STATUS_INVALID_PARAMETER;
102 }
103
104 DEBUG(5, ("Attempting to register new charset %s\n", funcs->name));
105 /* Check whether we already have this charset... */
106 if (find_charset_functions(funcs->name)) {
107 DEBUG(0, ("Duplicate charset %s, not registering\n", funcs->name));
108 return NT_STATUS_OBJECT_NAME_COLLISION;
109 }
110
111 funcs->next = funcs->prev = NULL;
112 DEBUG(5, ("Registered charset %s\n", funcs->name));
113 DLIST_ADD(charsets, funcs);
114 return NT_STATUS_OK;
115}
116
117static void lazy_initialize_iconv(void)
118{
119 static bool initialized;
120 int i;
121
122 if (!initialized) {
123 initialized = True;
124 for(i = 0; builtin_functions[i].name; i++)
125 smb_register_charset(&builtin_functions[i]);
126 static_init_charset;
127 }
128}
129
130#ifdef HAVE_NATIVE_ICONV
131/* if there was an error then reset the internal state,
132 this ensures that we don't have a shift state remaining for
133 character sets like SJIS */
134static size_t sys_iconv(void *cd,
135 const char **inbuf, size_t *inbytesleft,
136 char **outbuf, size_t *outbytesleft)
137{
138#ifdef __OS2__
139 uint16 *outbuf_uc = ( uint16 * )*outbuf;
140#endif
141
142 size_t ret = iconv((iconv_t)cd,
143 (void *)inbuf, inbytesleft,
144 outbuf, outbytesleft);
145 if (ret == (size_t)-1) {
146 int saved_errno = errno;
147 iconv(cd, NULL, NULL, NULL, NULL);
148 errno = saved_errno;
149 }
150#ifdef __OS2__
151 /* Workaround for path separator on OS/2 */
152 else
153 {
154 while(( char * )outbuf_uc < *outbuf )
155 {
156 if( *outbuf_uc == 0x20a9 || /* Korean WON */
157 *outbuf_uc == 0x00a5 ) /* Japanese YEN */
158 *outbuf_uc = '\\';
159
160 outbuf_uc++;
161 }
162 }
163#endif
164 return ret;
165}
166#endif
167
168/**
169 * This is a simple portable iconv() implementaion.
170 *
171 * It only knows about a very small number of character sets - just
172 * enough that Samba works on systems that don't have iconv.
173 **/
174size_t smb_iconv(smb_iconv_t cd,
175 const char **inbuf, size_t *inbytesleft,
176 char **outbuf, size_t *outbytesleft)
177{
178 char cvtbuf[2048];
179 char *bufp = cvtbuf;
180 size_t bufsize;
181
182 /* in many cases we can go direct */
183 if (cd->direct) {
184 return cd->direct(cd->cd_direct,
185 inbuf, inbytesleft, outbuf, outbytesleft);
186 }
187
188
189 /* otherwise we have to do it chunks at a time */
190 while (*inbytesleft > 0) {
191 bufp = cvtbuf;
192 bufsize = sizeof(cvtbuf);
193
194 if (cd->pull(cd->cd_pull,
195 inbuf, inbytesleft, &bufp, &bufsize) == -1
196 && errno != E2BIG) {
197DEBUG(0,("smb_iconv 2\n"));
198return -1;}
199
200 bufp = cvtbuf;
201 bufsize = sizeof(cvtbuf) - bufsize;
202
203 if (cd->push(cd->cd_push,
204 (const char **)&bufp, &bufsize,
205 outbuf, outbytesleft) == -1) {
206DEBUG(0,("smb_iconv 3\n"));
207return -1;}
208 }
209
210 return 0;
211}
212
213
214static bool is_utf16(const char *name)
215{
216 return strcasecmp(name, "UCS-2LE") == 0 ||
217 strcasecmp(name, "UTF-16LE") == 0;
218}
219
220/*
221 simple iconv_open() wrapper
222 */
223smb_iconv_t smb_iconv_open(const char *tocode, const char *fromcode)
224{
225 smb_iconv_t ret;
226 struct charset_functions *from, *to;
227
228 lazy_initialize_iconv();
229 from = charsets;
230 to = charsets;
231
232 ret = SMB_MALLOC_P(struct _smb_iconv_t);
233 if (!ret) {
234 errno = ENOMEM;
235 return (smb_iconv_t)-1;
236 }
237 memset(ret, 0, sizeof(struct _smb_iconv_t));
238
239 ret->from_name = SMB_STRDUP(fromcode);
240 ret->to_name = SMB_STRDUP(tocode);
241
242 /* check for the simplest null conversion */
243 if (strcasecmp(fromcode, tocode) == 0) {
244 ret->direct = iconv_copy;
245 return ret;
246 }
247
248 /* check if we have a builtin function for this conversion */
249 from = find_charset_functions(fromcode);
250 if(from)ret->pull = from->pull;
251
252 to = find_charset_functions(tocode);
253 if(to)ret->push = to->push;
254
255 /* check if we can use iconv for this conversion */
256#ifdef HAVE_NATIVE_ICONV
257 if (!ret->pull) {
258 ret->cd_pull = iconv_open("UTF-16LE", fromcode);
259 if (ret->cd_pull == (iconv_t)-1)
260 ret->cd_pull = iconv_open("UCS-2LE", fromcode);
261 if (ret->cd_pull != (iconv_t)-1)
262 ret->pull = sys_iconv;
263 }
264
265 if (!ret->push) {
266 ret->cd_push = iconv_open(tocode, "UTF-16LE");
267 if (ret->cd_push == (iconv_t)-1)
268 ret->cd_push = iconv_open(tocode, "UCS-2LE");
269 if (ret->cd_push != (iconv_t)-1)
270 ret->push = sys_iconv;
271 }
272#endif
273
274 /* check if there is a module available that can do this conversion */
275 if (!ret->pull && NT_STATUS_IS_OK(smb_probe_module("charset", fromcode))) {
276 if(!(from = find_charset_functions(fromcode)))
277 DEBUG(0, ("Module %s doesn't provide charset %s!\n", fromcode, fromcode));
278 else
279 ret->pull = from->pull;
280 }
281
282 if (!ret->push && NT_STATUS_IS_OK(smb_probe_module("charset", tocode))) {
283 if(!(to = find_charset_functions(tocode)))
284 DEBUG(0, ("Module %s doesn't provide charset %s!\n", tocode, tocode));
285 else
286 ret->push = to->push;
287 }
288
289 if (!ret->push || !ret->pull) {
290 SAFE_FREE(ret->from_name);
291 SAFE_FREE(ret->to_name);
292 SAFE_FREE(ret);
293 errno = EINVAL;
294 return (smb_iconv_t)-1;
295 }
296
297 /* check for conversion to/from ucs2 */
298 if (is_utf16(fromcode) && to) {
299 ret->direct = to->push;
300 ret->push = ret->pull = NULL;
301 return ret;
302 }
303
304 if (is_utf16(tocode) && from) {
305 ret->direct = from->pull;
306 ret->push = ret->pull = NULL;
307 return ret;
308 }
309
310 /* Check if we can do the conversion direct */
311#ifdef HAVE_NATIVE_ICONV
312 if (is_utf16(fromcode)) {
313 ret->direct = sys_iconv;
314 ret->cd_direct = ret->cd_push;
315 ret->cd_push = NULL;
316 return ret;
317 }
318 if (is_utf16(tocode)) {
319 ret->direct = sys_iconv;
320 ret->cd_direct = ret->cd_pull;
321 ret->cd_pull = NULL;
322 return ret;
323 }
324#endif
325
326 return ret;
327}
328
329/*
330 simple iconv_close() wrapper
331*/
332int smb_iconv_close (smb_iconv_t cd)
333{
334#ifdef HAVE_NATIVE_ICONV
335 if (cd->cd_direct) iconv_close((iconv_t)cd->cd_direct);
336 if (cd->cd_pull) iconv_close((iconv_t)cd->cd_pull);
337 if (cd->cd_push) iconv_close((iconv_t)cd->cd_push);
338#endif
339
340 SAFE_FREE(cd->from_name);
341 SAFE_FREE(cd->to_name);
342
343 memset(cd, 0, sizeof(*cd));
344 SAFE_FREE(cd);
345 return 0;
346}
347
348
349/**********************************************************************
350 the following functions implement the builtin character sets in Samba
351 and also the "test" character sets that are designed to test
352 multi-byte character set support for english users
353***********************************************************************/
354
355static size_t ascii_pull(void *cd, const char **inbuf, size_t *inbytesleft,
356 char **outbuf, size_t *outbytesleft)
357{
358 while (*inbytesleft >= 1 && *outbytesleft >= 2) {
359 (*outbuf)[0] = (*inbuf)[0];
360 (*outbuf)[1] = 0;
361 (*inbytesleft) -= 1;
362 (*outbytesleft) -= 2;
363 (*inbuf) += 1;
364 (*outbuf) += 2;
365 }
366
367 if (*inbytesleft > 0) {
368 errno = E2BIG;
369 return -1;
370 }
371
372 return 0;
373}
374
375static size_t ascii_push(void *cd, const char **inbuf, size_t *inbytesleft,
376 char **outbuf, size_t *outbytesleft)
377{
378 int ir_count=0;
379
380 while (*inbytesleft >= 2 && *outbytesleft >= 1) {
381 (*outbuf)[0] = (*inbuf)[0] & 0x7F;
382 if ((*inbuf)[1]) ir_count++;
383 (*inbytesleft) -= 2;
384 (*outbytesleft) -= 1;
385 (*inbuf) += 2;
386 (*outbuf) += 1;
387 }
388
389 if (*inbytesleft == 1) {
390 errno = EINVAL;
391 return -1;
392 }
393
394 if (*inbytesleft > 1) {
395 errno = E2BIG;
396 return -1;
397 }
398
399 return ir_count;
400}
401
402static size_t latin1_push(void *cd, const char **inbuf, size_t *inbytesleft,
403 char **outbuf, size_t *outbytesleft)
404{
405 int ir_count=0;
406
407 while (*inbytesleft >= 2 && *outbytesleft >= 1) {
408 (*outbuf)[0] = (*inbuf)[0];
409 if ((*inbuf)[1]) ir_count++;
410 (*inbytesleft) -= 2;
411 (*outbytesleft) -= 1;
412 (*inbuf) += 2;
413 (*outbuf) += 1;
414 }
415
416 if (*inbytesleft == 1) {
417 errno = EINVAL;
418 return -1;
419 }
420
421 if (*inbytesleft > 1) {
422 errno = E2BIG;
423 return -1;
424 }
425
426 return ir_count;
427}
428
429static size_t ucs2hex_pull(void *cd, const char **inbuf, size_t *inbytesleft,
430 char **outbuf, size_t *outbytesleft)
431{
432 while (*inbytesleft >= 1 && *outbytesleft >= 2) {
433 unsigned v;
434
435 if ((*inbuf)[0] != '@') {
436 /* seven bit ascii case */
437 (*outbuf)[0] = (*inbuf)[0];
438 (*outbuf)[1] = 0;
439 (*inbytesleft) -= 1;
440 (*outbytesleft) -= 2;
441 (*inbuf) += 1;
442 (*outbuf) += 2;
443 continue;
444 }
445 /* it's a hex character */
446 if (*inbytesleft < 5) {
447 errno = EINVAL;
448 return -1;
449 }
450
451 if (sscanf(&(*inbuf)[1], "%04x", &v) != 1) {
452 errno = EILSEQ;
453 return -1;
454 }
455
456 (*outbuf)[0] = v&0xff;
457 (*outbuf)[1] = v>>8;
458 (*inbytesleft) -= 5;
459 (*outbytesleft) -= 2;
460 (*inbuf) += 5;
461 (*outbuf) += 2;
462 }
463
464 if (*inbytesleft > 0) {
465 errno = E2BIG;
466 return -1;
467 }
468
469 return 0;
470}
471
472static size_t ucs2hex_push(void *cd, const char **inbuf, size_t *inbytesleft,
473 char **outbuf, size_t *outbytesleft)
474{
475 while (*inbytesleft >= 2 && *outbytesleft >= 1) {
476 char buf[6];
477
478 if ((*inbuf)[1] == 0 &&
479 ((*inbuf)[0] & 0x80) == 0 &&
480 (*inbuf)[0] != '@') {
481 (*outbuf)[0] = (*inbuf)[0];
482 (*inbytesleft) -= 2;
483 (*outbytesleft) -= 1;
484 (*inbuf) += 2;
485 (*outbuf) += 1;
486 continue;
487 }
488 if (*outbytesleft < 5) {
489 errno = E2BIG;
490 return -1;
491 }
492 snprintf(buf, 6, "@%04x", SVAL(*inbuf, 0));
493 memcpy(*outbuf, buf, 5);
494 (*inbytesleft) -= 2;
495 (*outbytesleft) -= 5;
496 (*inbuf) += 2;
497 (*outbuf) += 5;
498 }
499
500 if (*inbytesleft == 1) {
501 errno = EINVAL;
502 return -1;
503 }
504
505 if (*inbytesleft > 1) {
506 errno = E2BIG;
507 return -1;
508 }
509
510 return 0;
511}
512
513static size_t iconv_swab(void *cd, const char **inbuf, size_t *inbytesleft,
514 char **outbuf, size_t *outbytesleft)
515{
516 int n;
517
518 n = MIN(*inbytesleft, *outbytesleft);
519
520 swab(*inbuf, *outbuf, (n&~1));
521 if (n&1) {
522 (*outbuf)[n-1] = 0;
523 }
524
525 (*inbytesleft) -= n;
526 (*outbytesleft) -= n;
527 (*inbuf) += n;
528 (*outbuf) += n;
529
530 if (*inbytesleft > 0) {
531 errno = E2BIG;
532 return -1;
533 }
534
535 return 0;
536}
537
538static size_t iconv_copy(void *cd, const char **inbuf, size_t *inbytesleft,
539 char **outbuf, size_t *outbytesleft)
540{
541 int n;
542
543 n = MIN(*inbytesleft, *outbytesleft);
544
545 memmove(*outbuf, *inbuf, n);
546
547 (*inbytesleft) -= n;
548 (*outbytesleft) -= n;
549 (*inbuf) += n;
550 (*outbuf) += n;
551
552 if (*inbytesleft > 0) {
553 errno = E2BIG;
554 return -1;
555 }
556
557 return 0;
558}
559
560static size_t utf8_pull(void *cd, const char **inbuf, size_t *inbytesleft,
561 char **outbuf, size_t *outbytesleft)
562{
563 size_t in_left=*inbytesleft, out_left=*outbytesleft;
564 const uint8 *c = (const uint8 *)*inbuf;
565 uint8 *uc = (uint8 *)*outbuf;
566
567 while (in_left >= 1 && out_left >= 2) {
568 unsigned int codepoint;
569
570 if ((c[0] & 0x80) == 0) {
571 uc[0] = c[0];
572 uc[1] = 0;
573 c += 1;
574 in_left -= 1;
575 out_left -= 2;
576 uc += 2;
577 continue;
578 }
579
580 if ((c[0] & 0xe0) == 0xc0) {
581 if (in_left < 2 ||
582 (c[1] & 0xc0) != 0x80) {
583 errno = EILSEQ;
584 goto error;
585 }
586 codepoint = (c[1]&0x3f) | ((c[0]&0x1f)<<6);
587 if (codepoint < 0x80) {
588 /* don't accept UTF-8 characters that are not minimally packed */
589 errno = EILSEQ;
590 goto error;
591 }
592 uc[1] = codepoint >> 8;
593 uc[0] = codepoint & 0xff;
594 c += 2;
595 in_left -= 2;
596 out_left -= 2;
597 uc += 2;
598 continue;
599 }
600
601 if ((c[0] & 0xf0) == 0xe0) {
602 if (in_left < 3 ||
603 (c[1] & 0xc0) != 0x80 ||
604 (c[2] & 0xc0) != 0x80) {
605 errno = EILSEQ;
606 goto error;
607 }
608 codepoint = (c[2]&0x3f) | ((c[1]&0x3f)<<6) | ((c[0]&0xf)<<12);
609 if (codepoint < 0x800) {
610 /* don't accept UTF-8 characters that are not minimally packed */
611 errno = EILSEQ;
612 goto error;
613 }
614 uc[1] = codepoint >> 8;
615 uc[0] = codepoint & 0xff;
616 c += 3;
617 in_left -= 3;
618 out_left -= 2;
619 uc += 2;
620 continue;
621 }
622
623 if ((c[0] & 0xf8) == 0xf0) {
624 if (in_left < 4 ||
625 (c[1] & 0xc0) != 0x80 ||
626 (c[2] & 0xc0) != 0x80 ||
627 (c[3] & 0xc0) != 0x80) {
628 errno = EILSEQ;
629 goto error;
630 }
631 codepoint =
632 (c[3]&0x3f) |
633 ((c[2]&0x3f)<<6) |
634 ((c[1]&0x3f)<<12) |
635 ((c[0]&0x7)<<18);
636 if (codepoint < 0x10000 || codepoint > 0x10ffff) {
637 /* don't accept UTF-8 characters that are not minimally packed */
638 errno = EILSEQ;
639 goto error;
640 }
641
642 codepoint -= 0x10000;
643
644 if (out_left < 4) {
645 errno = E2BIG;
646 goto error;
647 }
648
649 uc[0] = (codepoint>>10) & 0xFF;
650 uc[1] = (codepoint>>18) | 0xd8;
651 uc[2] = codepoint & 0xFF;
652 uc[3] = ((codepoint>>8) & 0x3) | 0xdc;
653 c += 4;
654 in_left -= 4;
655 out_left -= 4;
656 uc += 4;
657 continue;
658 }
659
660 /* we don't handle 5 byte sequences */
661 errno = EINVAL;
662 goto error;
663 }
664
665 if (in_left > 0) {
666 errno = E2BIG;
667 goto error;
668 }
669
670 *inbytesleft = in_left;
671 *outbytesleft = out_left;
672 *inbuf = (char *)c;
673 *outbuf = (char *)uc;
674 return 0;
675
676error:
677 *inbytesleft = in_left;
678 *outbytesleft = out_left;
679 *inbuf = (char *)c;
680 *outbuf = (char *)uc;
681 return -1;
682}
683
684static size_t utf8_push(void *cd, const char **inbuf, size_t *inbytesleft,
685 char **outbuf, size_t *outbytesleft)
686{
687 size_t in_left=*inbytesleft, out_left=*outbytesleft;
688 uint8 *c = (uint8 *)*outbuf;
689 const uint8 *uc = (const uint8 *)*inbuf;
690
691 while (in_left >= 2 && out_left >= 1) {
692 unsigned int codepoint;
693
694 if (uc[1] == 0 && !(uc[0] & 0x80)) {
695 /* simplest case */
696 c[0] = uc[0];
697 in_left -= 2;
698 out_left -= 1;
699 uc += 2;
700 c += 1;
701 continue;
702 }
703
704 if ((uc[1]&0xf8) == 0) {
705 /* next simplest case */
706 if (out_left < 2) {
707 errno = E2BIG;
708 goto error;
709 }
710 c[0] = 0xc0 | (uc[0]>>6) | (uc[1]<<2);
711 c[1] = 0x80 | (uc[0] & 0x3f);
712 in_left -= 2;
713 out_left -= 2;
714 uc += 2;
715 c += 2;
716 continue;
717 }
718
719 if ((uc[1] & 0xfc) == 0xdc) {
720 /* its the second part of a 4 byte sequence. Illegal */
721 if (in_left < 4) {
722 errno = EINVAL;
723 } else {
724 errno = EILSEQ;
725 }
726 goto error;
727 }
728
729 if ((uc[1] & 0xfc) != 0xd8) {
730 codepoint = uc[0] | (uc[1]<<8);
731 if (out_left < 3) {
732 errno = E2BIG;
733 goto error;
734 }
735 c[0] = 0xe0 | (codepoint >> 12);
736 c[1] = 0x80 | ((codepoint >> 6) & 0x3f);
737 c[2] = 0x80 | (codepoint & 0x3f);
738
739 in_left -= 2;
740 out_left -= 3;
741 uc += 2;
742 c += 3;
743 continue;
744 }
745
746 /* its the first part of a 4 byte sequence */
747 if (in_left < 4) {
748 errno = EINVAL;
749 goto error;
750 }
751 if ((uc[3] & 0xfc) != 0xdc) {
752 errno = EILSEQ;
753 goto error;
754 }
755 codepoint = 0x10000 + (uc[2] | ((uc[3] & 0x3)<<8) |
756 (uc[0]<<10) | ((uc[1] & 0x3)<<18));
757
758 if (out_left < 4) {
759 errno = E2BIG;
760 goto error;
761 }
762 c[0] = 0xf0 | (codepoint >> 18);
763 c[1] = 0x80 | ((codepoint >> 12) & 0x3f);
764 c[2] = 0x80 | ((codepoint >> 6) & 0x3f);
765 c[3] = 0x80 | (codepoint & 0x3f);
766
767 in_left -= 4;
768 out_left -= 4;
769 uc += 4;
770 c += 4;
771 }
772
773 if (in_left == 1) {
774 errno = EINVAL;
775 goto error;
776 }
777
778 if (in_left > 1) {
779 errno = E2BIG;
780 goto error;
781 }
782
783 *inbytesleft = in_left;
784 *outbytesleft = out_left;
785 *inbuf = (char *)uc;
786 *outbuf = (char *)c;
787
788 return 0;
789
790error:
791 *inbytesleft = in_left;
792 *outbytesleft = out_left;
793 *inbuf = (char *)uc;
794 *outbuf = (char *)c;
795 return -1;
796}
797
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