dte test coverage

Directory: ./
File: src/convert.c
Date: 2025-07-19 20:13:10
Exec Total Coverage
Lines: 151 289 52.2%
Functions: 20 28 71.4%
Branches: 56 138 40.6%
Line Branch Exec Source
1 #include <errno.h>
2 #include <inttypes.h>
3 #include <stdlib.h>
4 #include <string.h>
5 #include "convert.h"
6 #include "block.h"
7 #include "buildvar-iconv.h"
8 #include "encoding.h"
9 #include "util/arith.h"
10 #include "util/debug.h"
11 #include "util/list.h"
12 #include "util/log.h"
13 #include "util/str-util.h"
14 #include "util/utf8.h"
15 #include "util/xmalloc.h"
16 #include "util/xreadwrite.h"
17
18 enum {
19 // If any line exceeds this length when reading a file, syntax
20 // highlighting will be automatically disabled
21 SYN_HIGHLIGHT_MAX_LINE_LEN = 512u << 10, // 512KiB
22 };
23
24 typedef struct {
25 const unsigned char *ibuf;
26 ssize_t ipos;
27 ssize_t isize;
28 struct cconv *cconv;
29 } FileDecoder;
30
31 56 static void add_block(Buffer *buffer, Block *blk)
32 {
33 56 buffer->nl += blk->nl;
34 56 list_insert_before(&blk->node, &buffer->blocks);
35 56 }
36
37 7605 static Block *add_utf8_line (
38 Buffer *buffer,
39 Block *blk,
40 const unsigned char *line,
41 size_t len
42 ) {
43 7605 size_t size = len + 1;
44
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 7605 if (blk) {
45 7577 size_t avail = blk->alloc - blk->size;
46
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 7577 if (size <= avail) {
47 7549 goto copy;
48 }
49 28 add_block(buffer, blk);
50 }
51 56 size = MAX(size, 8192);
52 56 blk = block_new(size);
53
54 7605 copy:
55
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 7605 if (unlikely(len > SYN_HIGHLIGHT_MAX_LINE_LEN && buffer->options.syntax)) {
56 // TODO: Make the limit configurable and add documentation
57 // TODO: Pass in an ErrorBuffer* and use error_msg() instead of LOG_NOTICE()
58 ✗ LOG_NOTICE (
59 "line length (%zu) exceeded limit (%ju); disabling syntax highlighting",
60 len, (uintmax_t)SYN_HIGHLIGHT_MAX_LINE_LEN
61 );
62 ✗ buffer->options.syntax = false;
63 }
64
65 7605 memcpy(blk->data + blk->size, line, len);
66 7605 blk->size += len;
67 7605 blk->data[blk->size++] = '\n';
68 7605 blk->nl++;
69 7605 return blk;
70 }
71
72 7639 static bool read_utf8_line(FileDecoder *dec, const char **linep, size_t *lenp)
73 {
74 7639 const char *line = dec->ibuf + dec->ipos;
75 7639 const char *nl = memchr(line, '\n', dec->isize - dec->ipos);
76 7639 size_t len;
77
78
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 7639 if (nl) {
79 7603 len = nl - line;
80 7603 dec->ipos += len + 1;
81 } else {
82 36 len = dec->isize - dec->ipos;
83
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 36 if (len == 0) {
84 return false;
85 }
86 2 dec->ipos += len;
87 }
88
89 7605 *linep = line;
90 7605 *lenp = len;
91 7605 return true;
92 }
93
94 34 static bool file_decoder_read_utf8(Buffer *buffer, const unsigned char *buf, size_t size)
95 {
96
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 34 if (unlikely(!encoding_is_utf8(buffer->encoding))) {
97 ✗ errno = EINVAL;
98 ✗ return false;
99 }
100
101 34 FileDecoder dec = {
102 .ibuf = buf,
103 .isize = size,
104 };
105
106 34 const char *line;
107 34 size_t len;
108
109
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 34 if (!read_utf8_line(&dec, &line, &len)) {
110 return true;
111 }
112
113
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 28 if (len && line[len - 1] == '\r') {
114 1 buffer->crlf_newlines = true;
115 1 len--;
116 }
117
118 28 Block *blk = add_utf8_line(buffer, NULL, line, len);
119
120
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 28 if (unlikely(buffer->crlf_newlines)) {
121
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 271 while (read_utf8_line(&dec, &line, &len)) {
122
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 270 if (len && line[len - 1] == '\r') {
123 1 len--;
124 }
125 270 blk = add_utf8_line(buffer, blk, line, len);
126 }
127 } else {
128
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 7334 while (read_utf8_line(&dec, &line, &len)) {
129 7307 blk = add_utf8_line(buffer, blk, line, len);
130 }
131 }
132
133
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 28 if (blk) {
134 28 add_block(buffer, blk);
135 }
136
137 return true;
138 }
139
140 1 static size_t unix_to_dos (
141 FileEncoder *enc,
142 const unsigned char *buf,
143 size_t size
144 ) {
145 // TODO: Pass in Buffer::nl and make this size adjustment more conservative
146 // (it's resized to handle the worst possible case, despite the fact that we
147 // already have the number of newlines pre-computed)
148
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 1 if (enc->nsize < size * 2) {
149 1 enc->nsize = size * 2;
150 1 enc->nbuf = xrealloc(enc->nbuf, enc->nsize);
151 }
152
153 // TODO: Optimize this loop, by making use of memccpy(3)
154 size_t d = 0;
155
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 22 for (size_t s = 0; s < size; s++) {
156 21 unsigned char ch = buf[s];
157
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 21 if (ch == '\n') {
158 3 enc->nbuf[d++] = '\r';
159 }
160 21 enc->nbuf[d++] = ch;
161 }
162
163 1 return d;
164 }
165
166 #if ICONV_DISABLE == 1 // iconv not available; use basic, UTF-8 implementation:
167
168 bool conversion_supported_by_iconv (
169 const char* UNUSED_ARG(from),
170 const char* UNUSED_ARG(to)
171 ) {
172 errno = EINVAL;
173 return false;
174 }
175
176 FileEncoder file_encoder(const char *encoding, bool crlf, int fd)
177 {
178 if (unlikely(!encoding_is_utf8(encoding))) {
179 BUG("unsupported conversion; should have been handled earlier");
180 }
181
182 return (FileEncoder) {
183 .crlf = crlf,
184 .fd = fd,
185 };
186 }
187
188 void file_encoder_free(FileEncoder *enc)
189 {
190 free(enc->nbuf);
191 }
192
193 ssize_t file_encoder_write(FileEncoder *enc, const unsigned char *buf, size_t n)
194 {
195 if (unlikely(enc->crlf)) {
196 n = unix_to_dos(enc, buf, n);
197 buf = enc->nbuf;
198 }
199 return xwrite_all(enc->fd, buf, n);
200 }
201
202 size_t file_encoder_get_nr_errors(const FileEncoder* UNUSED_ARG(enc))
203 {
204 return 0;
205 }
206
207 bool file_decoder_read(Buffer *buffer, const unsigned char *buf, size_t size)
208 {
209 return file_decoder_read_utf8(buffer, buf, size);
210 }
211
212 #else // ICONV_DISABLE != 1; use full iconv implementation:
213
214 #include <iconv.h>
215
216 // UTF-8 encoding of U+00BF (inverted question mark; "¿")
217 #define REPLACEMENT "\xc2\xbf"
218
219 struct cconv {
220 iconv_t cd;
221 char *obuf;
222 size_t osize;
223 size_t opos;
224 size_t consumed;
225 size_t errors;
226
227 // Temporary input buffer
228 char tbuf[16];
229 size_t tcount;
230
231 // REPLACEMENT character, in target encoding
232 char rbuf[4];
233 size_t rcount;
234
235 // Input character size in bytes, or zero for UTF-8
236 size_t char_size;
237 };
238
239 1 static struct cconv *create(iconv_t cd)
240 {
241 1 struct cconv *c = xcalloc1(sizeof(*c));
242 1 c->cd = cd;
243 1 c->osize = 8192;
244 1 c->obuf = xmalloc(c->osize);
245 1 return c;
246 }
247
248 2 static size_t iconv_wrapper (
249 iconv_t cd,
250 const char **restrict inbuf,
251 size_t *restrict inbytesleft,
252 char **restrict outbuf,
253 size_t *restrict outbytesleft
254 ) {
255 // POSIX defines the second parameter of iconv(3) as "char **restrict"
256 // but NetBSD declares it as "const char **restrict"
257 #ifdef __NetBSD__
258 const char **restrict in = inbuf;
259 #else
260 2 char **restrict in = (char **restrict)inbuf;
261 #endif
262
263 2 return iconv(cd, in, inbytesleft, outbuf, outbytesleft);
264 }
265
266 ✗ static void resize_obuf(struct cconv *c)
267 {
268 ✗ c->osize = xmul(2, c->osize);
269 ✗ c->obuf = xrealloc(c->obuf, c->osize);
270 ✗ }
271
272 ✗ static void add_replacement(struct cconv *c)
273 {
274 ✗ if (c->osize - c->opos < 4) {
275 ✗ resize_obuf(c);
276 }
277
278 ✗ memcpy(c->obuf + c->opos, c->rbuf, c->rcount);
279 ✗ c->opos += c->rcount;
280 ✗ }
281
282 ✗ static size_t handle_invalid(struct cconv *c, const char *buf, size_t count)
283 {
284 ✗ LOG_DEBUG("%zu %zu", c->char_size, count);
285 ✗ add_replacement(c);
286 ✗ if (c->char_size == 0) {
287 // Converting from UTF-8
288 ✗ size_t idx = 0;
289 ✗ CodePoint u = u_get_char(buf, count, &idx);
290 ✗ LOG_DEBUG("U+%04" PRIX32, u);
291 ✗ return idx;
292 }
293 ✗ if (c->char_size > count) {
294 // wtf
295 ✗ return 1;
296 }
297 return c->char_size;
298 }
299
300 1 static int xiconv(struct cconv *c, const char **ib, size_t *ic)
301 {
302 1 while (1) {
303 1 char *ob = c->obuf + c->opos;
304 1 size_t oc = c->osize - c->opos;
305 1 size_t rc = iconv_wrapper(c->cd, ib, ic, &ob, &oc);
306 1 c->opos = ob - c->obuf;
307
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 1 if (rc == (size_t)-1) {
308 ✗ switch (errno) {
309 ✗ case EILSEQ:
310 ✗ c->errors++;
311 // Reset
312 ✗ iconv(c->cd, NULL, NULL, NULL, NULL);
313 ✗ return errno;
314 case EINVAL:
315 return errno;
316 ✗ case E2BIG:
317 ✗ resize_obuf(c);
318 ✗ continue;
319 ✗ default:
320 − BUG("iconv: %s", strerror(errno));
321 }
322 } else {
323 1 c->errors += rc;
324 }
325 1 return 0;
326 }
327 }
328
329 ✗ static size_t convert_incomplete(struct cconv *c, const char *input, size_t len)
330 {
331 ✗ size_t ipos = 0;
332 ✗ while (c->tcount < sizeof(c->tbuf) && ipos < len) {
333 ✗ c->tbuf[c->tcount++] = input[ipos++];
334 ✗ const char *ib = c->tbuf;
335 ✗ size_t ic = c->tcount;
336 ✗ int rc = xiconv(c, &ib, &ic);
337 ✗ if (ic > 0) {
338 ✗ memmove(c->tbuf, ib, ic);
339 }
340 ✗ c->tcount = ic;
341 ✗ if (rc == EINVAL) {
342 // Incomplete character at end of input buffer; try again
343 // with more input data
344 ✗ continue;
345 }
346 ✗ if (rc == EILSEQ) {
347 // Invalid multibyte sequence
348 ✗ size_t skip = handle_invalid(c, c->tbuf, c->tcount);
349 ✗ c->tcount -= skip;
350 ✗ if (c->tcount > 0) {
351 ✗ LOG_DEBUG("tcount=%zu, skip=%zu", c->tcount, skip);
352 ✗ memmove(c->tbuf, c->tbuf + skip, c->tcount);
353 ✗ continue;
354 }
355 ✗ return ipos;
356 }
357 ✗ break;
358 }
359
360 ✗ LOG_DEBUG("%zu %zu", ipos, c->tcount);
361 ✗ return ipos;
362 }
363
364 1 static void cconv_process(struct cconv *c, const char *input, size_t len)
365 {
366
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 1 if (c->consumed > 0) {
367 ✗ size_t fill = c->opos - c->consumed;
368 ✗ memmove(c->obuf, c->obuf + c->consumed, fill);
369 ✗ c->opos = fill;
370 ✗ c->consumed = 0;
371 }
372
373
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 1 if (c->tcount > 0) {
374 ✗ size_t ipos = convert_incomplete(c, input, len);
375 ✗ input += ipos;
376 ✗ len -= ipos;
377 }
378
379 1 const char *ib = input;
380
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 2 for (size_t ic = len; ic > 0; ) {
381 1 int r = xiconv(c, &ib, &ic);
382
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 1 if (r == EINVAL) {
383 // Incomplete character at end of input buffer
384 ✗ if (ic < sizeof(c->tbuf)) {
385 ✗ memcpy(c->tbuf, ib, ic);
386 ✗ c->tcount = ic;
387 } else {
388 // FIXME
389 ✗ }
390 ✗ ic = 0;
391 ✗ continue;
392 }
393
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 1 if (r == EILSEQ) {
394 // Invalid multibyte sequence
395 ✗ size_t skip = handle_invalid(c, ib, ic);
396 ✗ ic -= skip;
397 ✗ ib += skip;
398 ✗ continue;
399 }
400 }
401 1 }
402
403 ✗ static struct cconv *cconv_to_utf8(const char *encoding)
404 {
405 ✗ iconv_t cd = iconv_open("UTF-8", encoding);
406 ✗ if (cd == (iconv_t)-1) {
407 return NULL;
408 }
409
410 ✗ struct cconv *c = create(cd);
411 ✗ c->rcount = copyliteral(c->rbuf, REPLACEMENT);
412
413 ✗ if (str_has_prefix(encoding, "UTF-16")) {
414 ✗ c->char_size = 2;
415 ✗ } else if (str_has_prefix(encoding, "UTF-32")) {
416 ✗ c->char_size = 4;
417 } else {
418 ✗ c->char_size = 1;
419 }
420
421 return c;
422 }
423
424 1 static void encode_replacement(struct cconv *c)
425 {
426 1 static const unsigned char rep[] = REPLACEMENT;
427 1 const char *ib = rep;
428 1 char *ob = c->rbuf;
429 1 size_t ic = STRLEN(REPLACEMENT);
430 1 size_t oc = sizeof(c->rbuf);
431 1 size_t rc = iconv_wrapper(c->cd, &ib, &ic, &ob, &oc);
432
433
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 1 if (rc == (size_t)-1) {
434 1 c->rbuf[0] = '\xbf';
435 1 c->rcount = 1;
436 } else {
437 ✗ c->rcount = ob - c->rbuf;
438 }
439 1 }
440
441 1 static struct cconv *cconv_from_utf8(const char *encoding)
442 {
443 1 iconv_t cd = iconv_open(encoding, "UTF-8");
444
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 1 if (cd == (iconv_t)-1) {
445 return NULL;
446 }
447 1 struct cconv *c = create(cd);
448 1 encode_replacement(c);
449 1 return c;
450 }
451
452 1 static void cconv_flush(struct cconv *c)
453 {
454
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 1 if (c->tcount > 0) {
455 // Replace incomplete character at end of input buffer
456 ✗ LOG_DEBUG("incomplete character at EOF");
457 ✗ add_replacement(c);
458 ✗ c->tcount = 0;
459 }
460 1 }
461
462 ✗ static char *cconv_consume_line(struct cconv *c, size_t *len)
463 {
464 ✗ char *line = c->obuf + c->consumed;
465 ✗ char *nl = memchr(line, '\n', c->opos - c->consumed);
466 ✗ if (!nl) {
467 ✗ *len = 0;
468 ✗ return NULL;
469 }
470
471 ✗ size_t n = nl - line + 1;
472 ✗ c->consumed += n;
473 ✗ *len = n;
474 ✗ return line;
475 }
476
477 1 static char *cconv_consume_all(struct cconv *c, size_t *len)
478 {
479 1 char *buf = c->obuf + c->consumed;
480 1 *len = c->opos - c->consumed;
481 1 c->consumed = c->opos;
482 1 return buf;
483 }
484
485 1 static void cconv_free(struct cconv *c)
486 {
487 1 BUG_ON(!c);
488 1 iconv_close(c->cd);
489 1 free(c->obuf);
490 1 free(c);
491 1 }
492
493 2 bool conversion_supported_by_iconv(const char *from, const char *to)
494 {
495
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 2 if (unlikely(from[0] == '\0' || to[0] == '\0')) {
496 ✗ errno = EINVAL;
497 ✗ return false;
498 }
499
500 2 iconv_t cd = iconv_open(to, from);
501
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 2 if (cd == (iconv_t)-1) {
502 return false;
503 }
504
505 2 iconv_close(cd);
506 2 return true;
507 }
508
509 21 FileEncoder file_encoder(const char *encoding, bool crlf, int fd)
510 {
511 21 struct cconv *cconv = NULL;
512
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 21 if (unlikely(!encoding_is_utf8(encoding))) {
513 1 cconv = cconv_from_utf8(encoding);
514
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 1 if (!cconv) {
515 − BUG("unsupported conversion; should have been handled earlier");
516 }
517 }
518
519 21 return (FileEncoder) {
520 .cconv = cconv,
521 .crlf = crlf,
522 .fd = fd,
523 };
524 }
525
526 21 void file_encoder_free(FileEncoder *enc)
527 {
528
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 21 if (enc->cconv) {
529 1 cconv_free(enc->cconv);
530 }
531 21 free(enc->nbuf);
532 21 }
533
534 // NOTE: buf must contain whole characters!
535 21 ssize_t file_encoder_write (
536 FileEncoder *enc,
537 const unsigned char *buf,
538 size_t size
539 ) {
540
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 21 if (unlikely(enc->crlf)) {
541 1 size = unix_to_dos(enc, buf, size);
542 1 buf = enc->nbuf;
543 }
544
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 21 if (unlikely(enc->cconv)) {
545 1 cconv_process(enc->cconv, buf, size);
546 1 cconv_flush(enc->cconv);
547 1 buf = cconv_consume_all(enc->cconv, &size);
548 }
549 21 return xwrite_all(enc->fd, buf, size);
550 }
551
552 21 size_t file_encoder_get_nr_errors(const FileEncoder *enc)
553 {
554
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 21 return enc->cconv ? enc->cconv->errors : 0;
555 }
556
557 ✗ static bool fill(FileDecoder *dec)
558 {
559 ✗ if (dec->ipos == dec->isize) {
560 return false;
561 }
562
563 // Smaller than cconv.obuf to make realloc less likely
564 ✗ size_t max = 7 * 1024;
565
566 ✗ size_t icount = MIN(dec->isize - dec->ipos, max);
567 ✗ cconv_process(dec->cconv, dec->ibuf + dec->ipos, icount);
568 ✗ dec->ipos += icount;
569 ✗ if (dec->ipos == dec->isize) {
570 // Must be flushed after all input has been fed
571 ✗ cconv_flush(dec->cconv);
572 }
573 return true;
574 }
575
576 ✗ static bool decode_and_read_line(FileDecoder *dec, const char **linep, size_t *lenp)
577 {
578 ✗ char *line;
579 ✗ size_t len;
580 ✗ while (1) {
581 ✗ line = cconv_consume_line(dec->cconv, &len);
582 ✗ if (line || !fill(dec)) {
583 break;
584 }
585 }
586
587 ✗ if (line) {
588 // Newline not wanted
589 ✗ len--;
590 } else {
591 ✗ line = cconv_consume_all(dec->cconv, &len);
592 ✗ if (len == 0) {
593 return false;
594 }
595 }
596
597 ✗ *linep = line;
598 ✗ *lenp = len;
599 ✗ return true;
600 }
601
602 34 bool file_decoder_read(Buffer *buffer, const unsigned char *buf, size_t size)
603 {
604
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 34 if (encoding_is_utf8(buffer->encoding)) {
605 34 return file_decoder_read_utf8(buffer, buf, size);
606 }
607
608 ✗ struct cconv *cconv = cconv_to_utf8(buffer->encoding);
609 ✗ if (!cconv) {
610 return false;
611 }
612
613 ✗ FileDecoder dec = {
614 .ibuf = buf,
615 .isize = size,
616 .cconv = cconv,
617 };
618
619 ✗ const char *line;
620 ✗ size_t len;
621
622 ✗ if (decode_and_read_line(&dec, &line, &len)) {
623 ✗ if (len && line[len - 1] == '\r') {
624 ✗ buffer->crlf_newlines = true;
625 ✗ len--;
626 }
627 ✗ Block *blk = add_utf8_line(buffer, NULL, line, len);
628 ✗ while (decode_and_read_line(&dec, &line, &len)) {
629 ✗ if (buffer->crlf_newlines && len && line[len - 1] == '\r') {
630 ✗ len--;
631 }
632 ✗ blk = add_utf8_line(buffer, blk, line, len);
633 }
634 ✗ if (blk) {
635 ✗ add_block(buffer, blk);
636 }
637 }
638
639 ✗ cconv_free(cconv);
640 ✗ return true;
641 }
642
643 #endif
644