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Do not check `NULL` to call free(): free() accepts `NULL`
[babeltrace.git] / src / common / common.c
1 /*
2 * Babeltrace common functions
3 *
4 * Copyright 2016 Philippe Proulx <pproulx@efficios.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 */
24
25 #define BT_LOG_OUTPUT_LEVEL log_level
26 #define BT_LOG_TAG "COMMON"
27 #include "logging/log.h"
28
29 #include <unistd.h>
30 #include <string.h>
31 #include <inttypes.h>
32 #include <sys/types.h>
33 #include <sys/stat.h>
34 #include <unistd.h>
35 #include "common/assert.h"
36 #include <stdarg.h>
37 #include <ctype.h>
38 #include <glib.h>
39 #include <stdlib.h>
40 #include <stdio.h>
41 #include <wchar.h>
42 #include <stdbool.h>
43 #include "common/macros.h"
44 #include "common/common.h"
45 #include "compat/unistd.h"
46
47 #ifndef __MINGW32__
48 #include <pwd.h>
49 #include <sys/ioctl.h>
50 #endif
51
52 #define SYSTEM_PLUGIN_PATH BABELTRACE_PLUGINS_DIR
53 #define HOME_ENV_VAR "HOME"
54 #define HOME_PLUGIN_SUBPATH "/.local/lib/babeltrace2/plugins"
55
56 static const char *bt_common_color_code_reset = "";
57 static const char *bt_common_color_code_bold = "";
58 static const char *bt_common_color_code_fg_default = "";
59 static const char *bt_common_color_code_fg_red = "";
60 static const char *bt_common_color_code_fg_green = "";
61 static const char *bt_common_color_code_fg_yellow = "";
62 static const char *bt_common_color_code_fg_blue = "";
63 static const char *bt_common_color_code_fg_magenta = "";
64 static const char *bt_common_color_code_fg_cyan = "";
65 static const char *bt_common_color_code_fg_light_gray = "";
66 static const char *bt_common_color_code_bg_default = "";
67 static const char *bt_common_color_code_bg_red = "";
68 static const char *bt_common_color_code_bg_green = "";
69 static const char *bt_common_color_code_bg_yellow = "";
70 static const char *bt_common_color_code_bg_blue = "";
71 static const char *bt_common_color_code_bg_magenta = "";
72 static const char *bt_common_color_code_bg_cyan = "";
73 static const char *bt_common_color_code_bg_light_gray = "";
74
75 static
76 void __attribute__((constructor)) bt_common_color_ctor(void)
77 {
78 if (bt_common_colors_supported()) {
79 bt_common_color_code_reset = BT_COMMON_COLOR_RESET;
80 bt_common_color_code_bold = BT_COMMON_COLOR_BOLD;
81 bt_common_color_code_fg_default = BT_COMMON_COLOR_FG_DEFAULT;
82 bt_common_color_code_fg_red = BT_COMMON_COLOR_FG_RED;
83 bt_common_color_code_fg_green = BT_COMMON_COLOR_FG_GREEN;
84 bt_common_color_code_fg_yellow = BT_COMMON_COLOR_FG_YELLOW;
85 bt_common_color_code_fg_blue = BT_COMMON_COLOR_FG_BLUE;
86 bt_common_color_code_fg_magenta = BT_COMMON_COLOR_FG_MAGENTA;
87 bt_common_color_code_fg_cyan = BT_COMMON_COLOR_FG_CYAN;
88 bt_common_color_code_fg_light_gray = BT_COMMON_COLOR_FG_LIGHT_GRAY;
89 bt_common_color_code_bg_default = BT_COMMON_COLOR_BG_DEFAULT;
90 bt_common_color_code_bg_red = BT_COMMON_COLOR_BG_RED;
91 bt_common_color_code_bg_green = BT_COMMON_COLOR_BG_GREEN;
92 bt_common_color_code_bg_yellow = BT_COMMON_COLOR_BG_YELLOW;
93 bt_common_color_code_bg_blue = BT_COMMON_COLOR_BG_BLUE;
94 bt_common_color_code_bg_magenta = BT_COMMON_COLOR_BG_MAGENTA;
95 bt_common_color_code_bg_cyan = BT_COMMON_COLOR_BG_CYAN;
96 bt_common_color_code_bg_light_gray = BT_COMMON_COLOR_BG_LIGHT_GRAY;
97 }
98 }
99
100 BT_HIDDEN
101 const char *bt_common_get_system_plugin_path(void)
102 {
103 return SYSTEM_PLUGIN_PATH;
104 }
105
106 #ifdef __MINGW32__
107 BT_HIDDEN
108 bool bt_common_is_setuid_setgid(void)
109 {
110 return false;
111 }
112 #else /* __MINGW32__ */
113 BT_HIDDEN
114 bool bt_common_is_setuid_setgid(void)
115 {
116 return (geteuid() != getuid() || getegid() != getgid());
117 }
118 #endif /* __MINGW32__ */
119
120 #ifdef __MINGW32__
121 static
122 const char *bt_get_home_dir(int log_level)
123 {
124 return g_get_home_dir();
125 }
126 #else /* __MINGW32__ */
127 static
128 char *bt_secure_getenv(const char *name, int log_level)
129 {
130 if (bt_common_is_setuid_setgid()) {
131 BT_LOGD("Disregarding environment variable for setuid/setgid binary: "
132 "name=\"%s\"", name);
133 return NULL;
134 }
135 return getenv(name);
136 }
137
138 static
139 const char *bt_get_home_dir(int log_level)
140 {
141 char *val = NULL;
142 struct passwd *pwd;
143
144 val = bt_secure_getenv(HOME_ENV_VAR, log_level);
145 if (val) {
146 goto end;
147 }
148 /* Fallback on password file. */
149 pwd = getpwuid(getuid());
150 if (!pwd) {
151 goto end;
152 }
153 val = pwd->pw_dir;
154 end:
155 return val;
156 }
157 #endif /* __MINGW32__ */
158
159 BT_HIDDEN
160 char *bt_common_get_home_plugin_path(int log_level)
161 {
162 char *path = NULL;
163 const char *home_dir;
164 size_t length;
165
166 home_dir = bt_get_home_dir(log_level);
167 if (!home_dir) {
168 goto end;
169 }
170
171 length = strlen(home_dir) + strlen(HOME_PLUGIN_SUBPATH) + 1;
172
173 if (length >= PATH_MAX) {
174 BT_LOGW("Home directory path is too long: "
175 "length=%zu, max-length=%u", length, PATH_MAX);
176 goto end;
177 }
178
179 path = malloc(PATH_MAX);
180 if (!path) {
181 goto end;
182 }
183
184 strcpy(path, home_dir);
185 strcat(path, HOME_PLUGIN_SUBPATH);
186
187 end:
188 return path;
189 }
190
191 BT_HIDDEN
192 int bt_common_append_plugin_path_dirs(const char *paths, GPtrArray *dirs)
193 {
194 int ret = 0;
195 const char *at;
196 const char *end;
197 size_t init_dirs_len;
198
199 BT_ASSERT(dirs);
200 init_dirs_len = dirs->len;
201
202 if (!paths) {
203 /* Nothing to append */
204 goto end;
205 }
206
207 at = paths;
208 end = paths + strlen(paths);
209
210 while (at < end) {
211 GString *path;
212 const char *next_sep;
213
214 next_sep = strchr(at, G_SEARCHPATH_SEPARATOR);
215 if (next_sep == at) {
216 /*
217 * Empty path: try next character (supported
218 * to conform to the typical parsing of $PATH).
219 */
220 at++;
221 continue;
222 } else if (!next_sep) {
223 /* No more separator: use the remaining */
224 next_sep = paths + strlen(paths);
225 }
226
227 path = g_string_new(NULL);
228 if (!path) {
229 goto error;
230 }
231
232 g_string_append_len(path, at, next_sep - at);
233 at = next_sep + 1;
234 g_ptr_array_add(dirs, path);
235 }
236
237 goto end;
238
239 error:
240 ret = -1;
241
242 /* Remove the new entries in dirs */
243 while (dirs->len > init_dirs_len) {
244 g_ptr_array_remove_index(dirs, init_dirs_len);
245 }
246
247 end:
248 return ret;
249 }
250
251 static
252 bool isarealtty(int fd)
253 {
254 bool istty = false;
255 struct stat tty_stats;
256
257 if (!isatty(fd)) {
258 /* Not a TTY */
259 goto end;
260 }
261
262 if (fstat(fd, &tty_stats) == 0) {
263 if (!S_ISCHR(tty_stats.st_mode)) {
264 /* Not a character device: not a TTY */
265 goto end;
266 }
267 }
268
269 istty = true;
270
271 end:
272 return istty;
273 }
274
275 BT_HIDDEN
276 bool bt_common_colors_supported(void)
277 {
278 static bool supports_colors = false;
279 static bool supports_colors_set = false;
280 const char *term_env_var;
281 const char *term_color_env_var;
282
283 if (supports_colors_set) {
284 goto end;
285 }
286
287 supports_colors_set = true;
288
289 /*
290 * `BABELTRACE_TERM_COLOR` environment variable always overrides
291 * the automatic color support detection.
292 */
293 term_color_env_var = getenv("BABELTRACE_TERM_COLOR");
294 if (term_color_env_var) {
295 if (g_ascii_strcasecmp(term_color_env_var, "always") == 0) {
296 /* Force colors */
297 supports_colors = true;
298 } else if (g_ascii_strcasecmp(term_color_env_var, "never") == 0) {
299 /* Force no colors */
300 goto end;
301 }
302 }
303
304 /* We need a compatible, known terminal */
305 term_env_var = getenv("TERM");
306 if (!term_env_var) {
307 goto end;
308 }
309
310 if (strncmp(term_env_var, "xterm", 5) != 0 &&
311 strncmp(term_env_var, "rxvt", 4) != 0 &&
312 strncmp(term_env_var, "konsole", 7) != 0 &&
313 strncmp(term_env_var, "gnome", 5) != 0 &&
314 strncmp(term_env_var, "screen", 5) != 0 &&
315 strncmp(term_env_var, "tmux", 4) != 0 &&
316 strncmp(term_env_var, "putty", 5) != 0) {
317 goto end;
318 }
319
320 /* Both standard output and error streams need to be TTYs */
321 if (!isarealtty(STDOUT_FILENO) || !isarealtty(STDERR_FILENO)) {
322 goto end;
323 }
324
325 supports_colors = true;
326
327 end:
328 return supports_colors;
329 }
330
331 BT_HIDDEN
332 const char *bt_common_color_reset(void)
333 {
334 return bt_common_color_code_reset;
335 }
336
337 BT_HIDDEN
338 const char *bt_common_color_bold(void)
339 {
340 return bt_common_color_code_bold;
341 }
342
343 BT_HIDDEN
344 const char *bt_common_color_fg_default(void)
345 {
346 return bt_common_color_code_fg_default;
347 }
348
349 BT_HIDDEN
350 const char *bt_common_color_fg_red(void)
351 {
352 return bt_common_color_code_fg_red;
353 }
354
355 BT_HIDDEN
356 const char *bt_common_color_fg_green(void)
357 {
358 return bt_common_color_code_fg_green;
359 }
360
361 BT_HIDDEN
362 const char *bt_common_color_fg_yellow(void)
363 {
364 return bt_common_color_code_fg_yellow;
365 }
366
367 BT_HIDDEN
368 const char *bt_common_color_fg_blue(void)
369 {
370 return bt_common_color_code_fg_blue;
371 }
372
373 BT_HIDDEN
374 const char *bt_common_color_fg_magenta(void)
375 {
376 return bt_common_color_code_fg_magenta;
377 }
378
379 BT_HIDDEN
380 const char *bt_common_color_fg_cyan(void)
381 {
382 return bt_common_color_code_fg_cyan;
383 }
384
385 BT_HIDDEN
386 const char *bt_common_color_fg_light_gray(void)
387 {
388 return bt_common_color_code_fg_light_gray;
389 }
390
391 BT_HIDDEN
392 const char *bt_common_color_bg_default(void)
393 {
394 return bt_common_color_code_bg_default;
395 }
396
397 BT_HIDDEN
398 const char *bt_common_color_bg_red(void)
399 {
400 return bt_common_color_code_bg_red;
401 }
402
403 BT_HIDDEN
404 const char *bt_common_color_bg_green(void)
405 {
406 return bt_common_color_code_bg_green;
407 }
408
409 BT_HIDDEN
410 const char *bt_common_color_bg_yellow(void)
411 {
412 return bt_common_color_code_bg_yellow;
413 }
414
415 BT_HIDDEN
416 const char *bt_common_color_bg_blue(void)
417 {
418 return bt_common_color_code_bg_blue;
419 }
420
421 BT_HIDDEN
422 const char *bt_common_color_bg_magenta(void)
423 {
424 return bt_common_color_code_bg_magenta;
425 }
426
427 BT_HIDDEN
428 const char *bt_common_color_bg_cyan(void)
429 {
430 return bt_common_color_code_bg_cyan;
431 }
432
433 BT_HIDDEN
434 const char *bt_common_color_bg_light_gray(void)
435 {
436 return bt_common_color_code_bg_light_gray;
437 }
438
439 BT_HIDDEN
440 GString *bt_common_string_until(const char *input, const char *escapable_chars,
441 const char *end_chars, size_t *end_pos)
442 {
443 GString *output = g_string_new(NULL);
444 const char *ch;
445 const char *es_char;
446 const char *end_char;
447
448 if (!output) {
449 goto error;
450 }
451
452 for (ch = input; *ch != '\0'; ch++) {
453 if (*ch == '\\') {
454 bool continue_loop = false;
455
456 if (ch[1] == '\0') {
457 /* `\` at the end of the string: append `\` */
458 g_string_append_c(output, *ch);
459 ch++;
460 goto set_end_pos;
461 }
462
463 for (es_char = escapable_chars; *es_char != '\0'; es_char++) {
464 if (ch[1] == *es_char) {
465 /*
466 * `\` followed by an escapable
467 * character: append the escaped
468 * character only.
469 */
470 g_string_append_c(output, ch[1]);
471 ch++;
472 continue_loop = true;
473 break;
474 }
475 }
476
477 if (continue_loop) {
478 continue;
479 }
480
481 /*
482 * `\` followed by a non-escapable character:
483 * append `\` and the character.
484 */
485 g_string_append_c(output, *ch);
486 g_string_append_c(output, ch[1]);
487 ch++;
488 continue;
489 } else {
490 for (end_char = end_chars; *end_char != '\0'; end_char++) {
491 if (*ch == *end_char) {
492 /*
493 * End character found:
494 * terminate this loop.
495 */
496 goto set_end_pos;
497 }
498 }
499
500 /* Normal character: append */
501 g_string_append_c(output, *ch);
502 }
503 }
504
505 set_end_pos:
506 if (end_pos) {
507 *end_pos = ch - input;
508 }
509
510 goto end;
511
512 error:
513 if (output) {
514 g_string_free(output, TRUE);
515 }
516
517 end:
518 return output;
519 }
520
521 BT_HIDDEN
522 GString *bt_common_shell_quote(const char *input, bool with_single_quotes)
523 {
524 GString *output = g_string_new(NULL);
525 const char *ch;
526 bool no_quote = true;
527
528 if (!output) {
529 goto end;
530 }
531
532 if (strlen(input) == 0) {
533 if (with_single_quotes) {
534 g_string_assign(output, "''");
535 }
536
537 goto end;
538 }
539
540 for (ch = input; *ch != '\0'; ch++) {
541 const char c = *ch;
542
543 if (!g_ascii_isalpha(c) && !g_ascii_isdigit(c) && c != '_' &&
544 c != '@' && c != '%' && c != '+' && c != '=' &&
545 c != ':' && c != ',' && c != '.' && c != '/' &&
546 c != '-') {
547 no_quote = false;
548 break;
549 }
550 }
551
552 if (no_quote) {
553 g_string_assign(output, input);
554 goto end;
555 }
556
557 if (with_single_quotes) {
558 g_string_assign(output, "'");
559 }
560
561 for (ch = input; *ch != '\0'; ch++) {
562 if (*ch == '\'') {
563 g_string_append(output, "'\"'\"'");
564 } else {
565 g_string_append_c(output, *ch);
566 }
567 }
568
569 if (with_single_quotes) {
570 g_string_append_c(output, '\'');
571 }
572
573 end:
574 return output;
575 }
576
577 BT_HIDDEN
578 bool bt_common_string_is_printable(const char *input)
579 {
580 const char *ch;
581 bool printable = true;
582 BT_ASSERT(input);
583
584 for (ch = input; *ch != '\0'; ch++) {
585 if (!isprint(*ch) && *ch != '\n' && *ch != '\r' &&
586 *ch != '\t' && *ch != '\v') {
587 printable = false;
588 goto end;
589 }
590 }
591
592 end:
593 return printable;
594 }
595
596 BT_HIDDEN
597 void bt_common_destroy_lttng_live_url_parts(
598 struct bt_common_lttng_live_url_parts *parts)
599 {
600 if (!parts) {
601 goto end;
602 }
603
604 if (parts->proto) {
605 g_string_free(parts->proto, TRUE);
606 parts->proto = NULL;
607 }
608
609 if (parts->hostname) {
610 g_string_free(parts->hostname, TRUE);
611 parts->hostname = NULL;
612 }
613
614 if (parts->target_hostname) {
615 g_string_free(parts->target_hostname, TRUE);
616 parts->target_hostname = NULL;
617 }
618
619 if (parts->session_name) {
620 g_string_free(parts->session_name, TRUE);
621 parts->session_name = NULL;
622 }
623
624 end:
625 return;
626 }
627
628 BT_HIDDEN
629 struct bt_common_lttng_live_url_parts bt_common_parse_lttng_live_url(
630 const char *url, char *error_buf, size_t error_buf_size)
631 {
632 struct bt_common_lttng_live_url_parts parts;
633 const char *at = url;
634 size_t end_pos;
635
636 BT_ASSERT(url);
637 memset(&parts, 0, sizeof(parts));
638 parts.port = -1;
639
640 /* Protocol */
641 parts.proto = bt_common_string_until(at, "", ":", &end_pos);
642 if (!parts.proto || parts.proto->len == 0) {
643 if (error_buf) {
644 snprintf(error_buf, error_buf_size, "Missing protocol");
645 }
646
647 goto error;
648 }
649
650 if (strcmp(parts.proto->str, "net") == 0) {
651 g_string_assign(parts.proto, "net4");
652 }
653
654 if (strcmp(parts.proto->str, "net4") != 0 &&
655 strcmp(parts.proto->str, "net6") != 0) {
656 if (error_buf) {
657 snprintf(error_buf, error_buf_size,
658 "Unknown protocol: `%s`", parts.proto->str);
659 }
660
661 goto error;
662 }
663
664 if (at[end_pos] != ':') {
665 if (error_buf) {
666 snprintf(error_buf, error_buf_size,
667 "Expecting `:` after `%s`", parts.proto->str);
668 }
669
670 goto error;
671 }
672
673 at += end_pos;
674
675 /* :// */
676 if (strncmp(at, "://", 3) != 0) {
677 if (error_buf) {
678 snprintf(error_buf, error_buf_size,
679 "Expecting `://` after protocol");
680 }
681
682 goto error;
683 }
684
685 at += 3;
686
687 /* Hostname */
688 parts.hostname = bt_common_string_until(at, "", ":/", &end_pos);
689 if (!parts.hostname || parts.hostname->len == 0) {
690 if (error_buf) {
691 snprintf(error_buf, error_buf_size, "Missing hostname");
692 }
693
694 goto error;
695 }
696
697 if (at[end_pos] == ':') {
698 /* Port */
699 GString *port;
700
701 at += end_pos + 1;
702 port = bt_common_string_until(at, "", "/", &end_pos);
703 if (!port || port->len == 0) {
704 if (error_buf) {
705 snprintf(error_buf, error_buf_size, "Missing port");
706 }
707
708 goto error;
709 }
710
711 if (sscanf(port->str, "%d", &parts.port) != 1) {
712 if (error_buf) {
713 snprintf(error_buf, error_buf_size,
714 "Invalid port: `%s`", port->str);
715 }
716
717 g_string_free(port, TRUE);
718 goto error;
719 }
720
721 g_string_free(port, TRUE);
722
723 if (parts.port < 0 || parts.port >= 65536) {
724 if (error_buf) {
725 snprintf(error_buf, error_buf_size,
726 "Invalid port: %d", parts.port);
727 }
728
729 goto error;
730 }
731 }
732
733 if (at[end_pos] == '\0') {
734 goto end;
735 }
736
737 at += end_pos;
738
739 /* /host/ */
740 if (strncmp(at, "/host/", 6) != 0) {
741 if (error_buf) {
742 snprintf(error_buf, error_buf_size,
743 "Expecting `/host/` after hostname or port");
744 }
745
746 goto error;
747 }
748
749 at += 6;
750
751 /* Target hostname */
752 parts.target_hostname = bt_common_string_until(at, "", "/", &end_pos);
753 if (!parts.target_hostname || parts.target_hostname->len == 0) {
754 if (error_buf) {
755 snprintf(error_buf, error_buf_size,
756 "Missing target hostname");
757 }
758
759 goto error;
760 }
761
762 if (at[end_pos] == '\0') {
763 goto end;
764 }
765
766 at += end_pos + 1;
767
768 /* Session name */
769 parts.session_name = bt_common_string_until(at, "", "/", &end_pos);
770 if (!parts.session_name || parts.session_name->len == 0) {
771 if (error_buf) {
772 snprintf(error_buf, error_buf_size,
773 "Missing session name");
774 }
775
776 goto error;
777 }
778
779 if (at[end_pos] == '/') {
780 if (error_buf) {
781 snprintf(error_buf, error_buf_size,
782 "Unexpected `/` after session name (`%s`)",
783 parts.session_name->str);
784 }
785
786 goto error;
787 }
788
789 goto end;
790
791 error:
792 bt_common_destroy_lttng_live_url_parts(&parts);
793
794 end:
795 return parts;
796 }
797
798 BT_HIDDEN
799 void bt_common_normalize_star_glob_pattern(char *pattern)
800 {
801 const char *p;
802 char *np;
803 bool got_star = false;
804
805 BT_ASSERT(pattern);
806
807 for (p = pattern, np = pattern; *p != '\0'; p++) {
808 switch (*p) {
809 case '*':
810 if (got_star) {
811 /* Avoid consecutive stars. */
812 continue;
813 }
814
815 got_star = true;
816 break;
817 case '\\':
818 /* Copy backslash character. */
819 *np = *p;
820 np++;
821 p++;
822
823 if (*p == '\0') {
824 goto end;
825 }
826
827 /* fall-through */
828 default:
829 got_star = false;
830 break;
831 }
832
833 /* Copy single character. */
834 *np = *p;
835 np++;
836 }
837
838 end:
839 *np = '\0';
840 }
841
842 static inline
843 bool at_end_of_pattern(const char *p, const char *pattern, size_t pattern_len)
844 {
845 return (p - pattern) == pattern_len || *p == '\0';
846 }
847
848 /*
849 * Globbing matching function with the star feature only (`?` and
850 * character sets are not supported). This matches `candidate` (plain
851 * string) against `pattern`. A literal star can be escaped with `\` in
852 * `pattern`.
853 *
854 * `pattern_len` or `candidate_len` can be greater than the actual
855 * string length of `pattern` or `candidate` if the string is
856 * null-terminated.
857 */
858 BT_HIDDEN
859 bool bt_common_star_glob_match(const char *pattern, size_t pattern_len,
860 const char *candidate, size_t candidate_len) {
861 const char *retry_c = candidate, *retry_p = pattern, *c, *p;
862 bool got_a_star = false;
863
864 retry:
865 c = retry_c;
866 p = retry_p;
867
868 /*
869 * The concept here is to retry a match in the specific case
870 * where we already got a star. The retry position for the
871 * pattern is just after the most recent star, and the retry
872 * position for the candidate is the character following the
873 * last try's first character.
874 *
875 * Example:
876 *
877 * candidate: hi ev every onyx one
878 * ^
879 * pattern: hi*every*one
880 * ^
881 *
882 * candidate: hi ev every onyx one
883 * ^
884 * pattern: hi*every*one
885 * ^
886 *
887 * candidate: hi ev every onyx one
888 * ^
889 * pattern: hi*every*one
890 * ^
891 *
892 * candidate: hi ev every onyx one
893 * ^
894 * pattern: hi*every*one
895 * ^ MISMATCH
896 *
897 * candidate: hi ev every onyx one
898 * ^
899 * pattern: hi*every*one
900 * ^
901 *
902 * candidate: hi ev every onyx one
903 * ^^
904 * pattern: hi*every*one
905 * ^^
906 *
907 * candidate: hi ev every onyx one
908 * ^ ^
909 * pattern: hi*every*one
910 * ^ ^ MISMATCH
911 *
912 * candidate: hi ev every onyx one
913 * ^
914 * pattern: hi*every*one
915 * ^ MISMATCH
916 *
917 * candidate: hi ev every onyx one
918 * ^
919 * pattern: hi*every*one
920 * ^ MISMATCH
921 *
922 * candidate: hi ev every onyx one
923 * ^
924 * pattern: hi*every*one
925 * ^
926 *
927 * candidate: hi ev every onyx one
928 * ^^
929 * pattern: hi*every*one
930 * ^^
931 *
932 * candidate: hi ev every onyx one
933 * ^ ^
934 * pattern: hi*every*one
935 * ^ ^
936 *
937 * candidate: hi ev every onyx one
938 * ^ ^
939 * pattern: hi*every*one
940 * ^ ^
941 *
942 * candidate: hi ev every onyx one
943 * ^ ^
944 * pattern: hi*every*one
945 * ^ ^
946 *
947 * candidate: hi ev every onyx one
948 * ^
949 * pattern: hi*every*one
950 * ^
951 *
952 * candidate: hi ev every onyx one
953 * ^
954 * pattern: hi*every*one
955 * ^ MISMATCH
956 *
957 * candidate: hi ev every onyx one
958 * ^
959 * pattern: hi*every*one
960 * ^
961 *
962 * candidate: hi ev every onyx one
963 * ^^
964 * pattern: hi*every*one
965 * ^^
966 *
967 * candidate: hi ev every onyx one
968 * ^ ^
969 * pattern: hi*every*one
970 * ^ ^ MISMATCH
971 *
972 * candidate: hi ev every onyx one
973 * ^
974 * pattern: hi*every*one
975 * ^ MISMATCH
976 *
977 * candidate: hi ev every onyx one
978 * ^
979 * pattern: hi*every*one
980 * ^ MISMATCH
981 *
982 * candidate: hi ev every onyx one
983 * ^
984 * pattern: hi*every*one
985 * ^ MISMATCH
986 *
987 * candidate: hi ev every onyx one
988 * ^
989 * pattern: hi*every*one
990 * ^ MISMATCH
991 *
992 * candidate: hi ev every onyx one
993 * ^
994 * pattern: hi*every*one
995 * ^
996 *
997 * candidate: hi ev every onyx one
998 * ^^
999 * pattern: hi*every*one
1000 * ^^
1001 *
1002 * candidate: hi ev every onyx one
1003 * ^ ^
1004 * pattern: hi*every*one
1005 * ^ ^
1006 *
1007 * candidate: hi ev every onyx one
1008 * ^ ^
1009 * pattern: hi*every*one
1010 * ^ ^ SUCCESS
1011 */
1012 while ((c - candidate) < candidate_len && *c != '\0') {
1013 BT_ASSERT(*c);
1014
1015 if (at_end_of_pattern(p, pattern, pattern_len)) {
1016 goto end_of_pattern;
1017 }
1018
1019 switch (*p) {
1020 case '*':
1021 got_a_star = true;
1022
1023 /*
1024 * Our first try starts at the current candidate
1025 * character and after the star in the pattern.
1026 */
1027 retry_c = c;
1028 retry_p = p + 1;
1029
1030 if (at_end_of_pattern(retry_p, pattern, pattern_len)) {
1031 /*
1032 * Star at the end of the pattern at
1033 * this point: automatic match.
1034 */
1035 return true;
1036 }
1037
1038 goto retry;
1039 case '\\':
1040 /* Go to escaped character. */
1041 p++;
1042
1043 /*
1044 * Fall through the default case which compares
1045 * the escaped character now.
1046 */
1047 /* fall-through */
1048 default:
1049 if (at_end_of_pattern(p, pattern, pattern_len) ||
1050 *c != *p) {
1051 end_of_pattern:
1052 /* Character mismatch OR end of pattern. */
1053 if (!got_a_star) {
1054 /*
1055 * We didn't get any star yet,
1056 * so this first mismatch
1057 * automatically makes the whole
1058 * test fail.
1059 */
1060 return false;
1061 }
1062
1063 /*
1064 * Next try: next candidate character,
1065 * original pattern character (following
1066 * the most recent star).
1067 */
1068 retry_c++;
1069 goto retry;
1070 }
1071 break;
1072 }
1073
1074 /* Next pattern and candidate characters. */
1075 c++;
1076 p++;
1077 }
1078
1079 /*
1080 * We checked every candidate character and we're still in a
1081 * success state: the only pattern character allowed to remain
1082 * is a star.
1083 */
1084 if (at_end_of_pattern(p, pattern, pattern_len)) {
1085 return true;
1086 }
1087
1088 p++;
1089 return p[-1] == '*' && at_end_of_pattern(p, pattern, pattern_len);
1090 }
1091
1092 #ifdef __MINGW32__
1093 BT_HIDDEN
1094 GString *bt_common_normalize_path(const char *path, const char *wd)
1095 {
1096 char *tmp;
1097 GString *norm_path = NULL;
1098
1099 BT_ASSERT(path);
1100
1101 tmp = _fullpath(NULL, path, PATH_MAX);
1102 if (!tmp) {
1103 goto error;
1104 }
1105
1106 norm_path = g_string_new(tmp);
1107 if (!norm_path) {
1108 goto error;
1109 }
1110
1111 goto end;
1112 error:
1113 if (norm_path) {
1114 g_string_free(norm_path, TRUE);
1115 norm_path = NULL;
1116 }
1117 end:
1118 free(tmp);
1119 return norm_path;
1120 }
1121 #else
1122 static
1123 void append_path_parts(const char *path, GPtrArray *parts)
1124 {
1125 const char *ch = path;
1126 const char *last = path;
1127
1128 while (true) {
1129 if (*ch == G_DIR_SEPARATOR || *ch == '\0') {
1130 if (ch - last > 0) {
1131 GString *part = g_string_new(NULL);
1132
1133 BT_ASSERT(part);
1134 g_string_append_len(part, last, ch - last);
1135 g_ptr_array_add(parts, part);
1136 }
1137
1138 if (*ch == '\0') {
1139 break;
1140 }
1141
1142 last = ch + 1;
1143 }
1144
1145 ch++;
1146 }
1147 }
1148
1149 static
1150 void destroy_gstring(void *gstring)
1151 {
1152 (void) g_string_free(gstring, TRUE);
1153 }
1154
1155 BT_HIDDEN
1156 GString *bt_common_normalize_path(const char *path, const char *wd)
1157 {
1158 size_t i;
1159 GString *norm_path;
1160 GPtrArray *parts = NULL;
1161
1162 BT_ASSERT(path);
1163 norm_path = g_string_new(G_DIR_SEPARATOR_S);
1164 if (!norm_path) {
1165 goto error;
1166 }
1167
1168 parts = g_ptr_array_new_with_free_func(destroy_gstring);
1169 if (!parts) {
1170 goto error;
1171 }
1172
1173 if (path[0] != G_DIR_SEPARATOR) {
1174 /* Relative path: start with working directory */
1175 if (wd) {
1176 append_path_parts(wd, parts);
1177 } else {
1178 gchar *cd = g_get_current_dir();
1179
1180 append_path_parts(cd, parts);
1181 g_free(cd);
1182 }
1183 }
1184
1185 /* Append parts of the path parameter */
1186 append_path_parts(path, parts);
1187
1188 /* Resolve special `..` and `.` parts */
1189 for (i = 0; i < parts->len; i++) {
1190 GString *part = g_ptr_array_index(parts, i);
1191
1192 if (strcmp(part->str, "..") == 0) {
1193 if (i == 0) {
1194 /*
1195 * First part of absolute path is `..`:
1196 * this is invalid.
1197 */
1198 goto error;
1199 }
1200
1201 /* Remove `..` and previous part */
1202 g_ptr_array_remove_index(parts, i - 1);
1203 g_ptr_array_remove_index(parts, i - 1);
1204 i -= 2;
1205 } else if (strcmp(part->str, ".") == 0) {
1206 /* Remove `.` */
1207 g_ptr_array_remove_index(parts, i);
1208 i -= 1;
1209 }
1210 }
1211
1212 /* Create normalized path with what's left */
1213 for (i = 0; i < parts->len; i++) {
1214 GString *part = g_ptr_array_index(parts, i);
1215
1216 g_string_append(norm_path, part->str);
1217
1218 if (i < parts->len - 1) {
1219 g_string_append_c(norm_path, G_DIR_SEPARATOR);
1220 }
1221 }
1222
1223 goto end;
1224
1225 error:
1226 if (norm_path) {
1227 g_string_free(norm_path, TRUE);
1228 norm_path = NULL;
1229 }
1230
1231 end:
1232 if (parts) {
1233 g_ptr_array_free(parts, TRUE);
1234 }
1235
1236 return norm_path;
1237 }
1238 #endif
1239
1240 BT_HIDDEN
1241 size_t bt_common_get_page_size(int log_level)
1242 {
1243 int page_size;
1244
1245 page_size = bt_sysconf(_SC_PAGESIZE);
1246 if (page_size < 0) {
1247 BT_LOGF("Cannot get system's page size: ret=%d",
1248 page_size);
1249 abort();
1250 }
1251
1252 return page_size;
1253 }
1254
1255 #define BUF_STD_APPEND(...) \
1256 do { \
1257 char _tmp_fmt[64]; \
1258 int _count; \
1259 size_t _size = buf_size - (size_t) (*buf_ch - buf); \
1260 size_t _tmp_fmt_size = (size_t) (fmt_ch - *out_fmt_ch); \
1261 strncpy(_tmp_fmt, *out_fmt_ch, _tmp_fmt_size); \
1262 _tmp_fmt[_tmp_fmt_size] = '\0'; \
1263 _count = snprintf(*buf_ch, _size, _tmp_fmt, __VA_ARGS__); \
1264 BT_ASSERT(_count >= 0); \
1265 *buf_ch += MIN(_count, _size); \
1266 } while (0)
1267
1268 #define BUF_STD_APPEND_SINGLE_ARG(_type) \
1269 do { \
1270 _type _arg = va_arg(*args, _type); \
1271 BUF_STD_APPEND(_arg); \
1272 } while (0)
1273
1274 static inline void handle_conversion_specifier_std(char *buf, char **buf_ch,
1275 size_t buf_size, const char **out_fmt_ch, va_list *args)
1276 {
1277 const char *fmt_ch = *out_fmt_ch;
1278 enum LENGTH_MODIFIER {
1279 LENGTH_MOD_H,
1280 LENGTH_MOD_HH,
1281 LENGTH_MOD_NONE,
1282 LENGTH_MOD_LOW_L,
1283 LENGTH_MOD_LOW_LL,
1284 LENGTH_MOD_UP_L,
1285 LENGTH_MOD_Z,
1286 } length_mod = LENGTH_MOD_NONE;
1287
1288 /* skip '%' */
1289 fmt_ch++;
1290
1291 if (*fmt_ch == '%') {
1292 fmt_ch++;
1293 **buf_ch = '%';
1294 (*buf_ch)++;
1295 goto update_rw_fmt;
1296 }
1297
1298 /* flags */
1299 for (;;) {
1300 switch (*fmt_ch) {
1301 case '-':
1302 case '+':
1303 case ' ':
1304 case '#':
1305 case '0':
1306 case '\'':
1307 fmt_ch++;
1308 continue;
1309 default:
1310 break;
1311 }
1312 break;
1313 }
1314
1315 /* width */
1316 for (;;) {
1317 if (*fmt_ch < '0' || *fmt_ch > '9') {
1318 break;
1319 }
1320
1321 fmt_ch++;
1322 }
1323
1324 /* precision */
1325 if (*fmt_ch == '.') {
1326 fmt_ch++;
1327
1328 for (;;) {
1329 if (*fmt_ch < '0' || *fmt_ch > '9') {
1330 break;
1331 }
1332
1333 fmt_ch++;
1334 }
1335 }
1336
1337 /* format (PRI*64) */
1338 if (strncmp(fmt_ch, PRId64, sizeof(PRId64) - 1) == 0) {
1339 fmt_ch += sizeof(PRId64) - 1;
1340 BUF_STD_APPEND_SINGLE_ARG(int64_t);
1341 goto update_rw_fmt;
1342 } else if (strncmp(fmt_ch, PRIu64, sizeof(PRIu64) - 1) == 0) {
1343 fmt_ch += sizeof(PRIu64) - 1;
1344 BUF_STD_APPEND_SINGLE_ARG(uint64_t);
1345 goto update_rw_fmt;
1346 } else if (strncmp(fmt_ch, PRIx64, sizeof(PRIx64) - 1) == 0) {
1347 fmt_ch += sizeof(PRIx64) - 1;
1348 BUF_STD_APPEND_SINGLE_ARG(uint64_t);
1349 goto update_rw_fmt;
1350 } else if (strncmp(fmt_ch, PRIX64, sizeof(PRIX64) - 1) == 0) {
1351 fmt_ch += sizeof(PRIX64) - 1;
1352 BUF_STD_APPEND_SINGLE_ARG(uint64_t);
1353 goto update_rw_fmt;
1354 } else if (strncmp(fmt_ch, PRIo64, sizeof(PRIo64) - 1) == 0) {
1355 fmt_ch += sizeof(PRIo64) - 1;
1356 BUF_STD_APPEND_SINGLE_ARG(uint64_t);
1357 goto update_rw_fmt;
1358 } else if (strncmp(fmt_ch, PRIi64, sizeof(PRIi64) - 1) == 0) {
1359 fmt_ch += sizeof(PRIi64) - 1;
1360 BUF_STD_APPEND_SINGLE_ARG(int64_t);
1361 goto update_rw_fmt;
1362 }
1363
1364 // length modifier
1365 switch (*fmt_ch) {
1366 case 'h':
1367 length_mod = LENGTH_MOD_H;
1368 fmt_ch++;
1369
1370 if (*fmt_ch == 'h') {
1371 length_mod = LENGTH_MOD_HH;
1372 fmt_ch++;
1373 break;
1374 }
1375 break;
1376 case 'l':
1377 length_mod = LENGTH_MOD_LOW_L;
1378 fmt_ch++;
1379
1380 if (*fmt_ch == 'l') {
1381 length_mod = LENGTH_MOD_LOW_LL;
1382 fmt_ch++;
1383 break;
1384 }
1385 break;
1386 case 'L':
1387 length_mod = LENGTH_MOD_UP_L;
1388 fmt_ch++;
1389 break;
1390 case 'z':
1391 length_mod = LENGTH_MOD_Z;
1392 fmt_ch++;
1393 break;
1394 default:
1395 break;
1396 }
1397
1398 // format
1399 switch (*fmt_ch) {
1400 case 'c':
1401 {
1402 fmt_ch++;
1403
1404 switch (length_mod) {
1405 case LENGTH_MOD_NONE:
1406 BUF_STD_APPEND_SINGLE_ARG(int);
1407 break;
1408 case LENGTH_MOD_LOW_L:
1409 BUF_STD_APPEND_SINGLE_ARG(wint_t);
1410 break;
1411 default:
1412 abort();
1413 }
1414 break;
1415 }
1416 case 's':
1417 fmt_ch++;
1418
1419 switch (length_mod) {
1420 case LENGTH_MOD_NONE:
1421 BUF_STD_APPEND_SINGLE_ARG(char *);
1422 break;
1423 case LENGTH_MOD_LOW_L:
1424 BUF_STD_APPEND_SINGLE_ARG(wchar_t *);
1425 break;
1426 default:
1427 abort();
1428 }
1429 break;
1430 case 'd':
1431 case 'i':
1432 fmt_ch++;
1433
1434 switch (length_mod) {
1435 case LENGTH_MOD_NONE:
1436 case LENGTH_MOD_H:
1437 case LENGTH_MOD_HH:
1438 BUF_STD_APPEND_SINGLE_ARG(int);
1439 break;
1440 case LENGTH_MOD_LOW_L:
1441 BUF_STD_APPEND_SINGLE_ARG(long);
1442 break;
1443 case LENGTH_MOD_LOW_LL:
1444 BUF_STD_APPEND_SINGLE_ARG(long long);
1445 break;
1446 case LENGTH_MOD_Z:
1447 BUF_STD_APPEND_SINGLE_ARG(size_t);
1448 break;
1449 default:
1450 abort();
1451 }
1452 break;
1453 case 'o':
1454 case 'x':
1455 case 'X':
1456 case 'u':
1457 fmt_ch++;
1458
1459 switch (length_mod) {
1460 case LENGTH_MOD_NONE:
1461 case LENGTH_MOD_H:
1462 case LENGTH_MOD_HH:
1463 BUF_STD_APPEND_SINGLE_ARG(unsigned int);
1464 break;
1465 case LENGTH_MOD_LOW_L:
1466 BUF_STD_APPEND_SINGLE_ARG(unsigned long);
1467 break;
1468 case LENGTH_MOD_LOW_LL:
1469 BUF_STD_APPEND_SINGLE_ARG(unsigned long long);
1470 break;
1471 case LENGTH_MOD_Z:
1472 BUF_STD_APPEND_SINGLE_ARG(size_t);
1473 break;
1474 default:
1475 abort();
1476 }
1477 break;
1478 case 'f':
1479 case 'F':
1480 case 'e':
1481 case 'E':
1482 case 'g':
1483 case 'G':
1484 fmt_ch++;
1485
1486 switch (length_mod) {
1487 case LENGTH_MOD_NONE:
1488 BUF_STD_APPEND_SINGLE_ARG(double);
1489 break;
1490 case LENGTH_MOD_UP_L:
1491 BUF_STD_APPEND_SINGLE_ARG(long double);
1492 break;
1493 default:
1494 abort();
1495 }
1496 break;
1497 case 'p':
1498 fmt_ch++;
1499
1500 if (length_mod == LENGTH_MOD_NONE) {
1501 BUF_STD_APPEND_SINGLE_ARG(void *);
1502 } else {
1503 abort();
1504 }
1505 break;
1506 default:
1507 abort();
1508 }
1509
1510 update_rw_fmt:
1511 *out_fmt_ch = fmt_ch;
1512 }
1513
1514 BT_HIDDEN
1515 void bt_common_custom_vsnprintf(char *buf, size_t buf_size,
1516 char intro,
1517 bt_common_handle_custom_specifier_func handle_specifier,
1518 void *priv_data, const char *fmt, va_list *args)
1519 {
1520 const char *fmt_ch = fmt;
1521 char *buf_ch = buf;
1522
1523 BT_ASSERT(buf);
1524 BT_ASSERT(fmt);
1525
1526 while (*fmt_ch != '\0') {
1527 switch (*fmt_ch) {
1528 case '%':
1529 BT_ASSERT(fmt_ch[1] != '\0');
1530
1531 if (fmt_ch[1] == intro) {
1532 handle_specifier(priv_data, &buf_ch,
1533 buf_size - (size_t) (buf_ch - buf),
1534 &fmt_ch, args);
1535 } else {
1536 handle_conversion_specifier_std(buf, &buf_ch,
1537 buf_size, &fmt_ch, args);
1538 }
1539
1540 if (buf_ch >= buf + buf_size - 1) {
1541 fmt_ch = "";
1542 }
1543 break;
1544 default:
1545 *buf_ch = *fmt_ch;
1546 buf_ch++;
1547 if (buf_ch >= buf + buf_size - 1) {
1548 fmt_ch = "";
1549 }
1550
1551 fmt_ch++;
1552 }
1553 }
1554
1555 *buf_ch = '\0';
1556 }
1557
1558 BT_HIDDEN
1559 void bt_common_custom_snprintf(char *buf, size_t buf_size,
1560 char intro,
1561 bt_common_handle_custom_specifier_func handle_specifier,
1562 void *priv_data, const char *fmt, ...)
1563 {
1564 va_list args;
1565 va_start(args, fmt);
1566 bt_common_custom_vsnprintf(buf, buf_size, intro, handle_specifier,
1567 priv_data, fmt, &args);
1568 va_end(args);
1569 }
1570
1571 BT_HIDDEN
1572 void bt_common_sep_digits(char *str, unsigned int digits_per_group, char sep)
1573 {
1574 const char *rd;
1575 char *wr;
1576 uint64_t i = 0;
1577 uint64_t orig_len;
1578 uint64_t sep_count;
1579 uint64_t new_len;
1580
1581 BT_ASSERT(digits_per_group > 0);
1582 BT_ASSERT(sep != '\0');
1583
1584 /* Compute new length of `str` */
1585 orig_len = strlen(str);
1586 BT_ASSERT(orig_len > 0);
1587 sep_count = (orig_len - 1) / digits_per_group;
1588 new_len = strlen(str) + sep_count;
1589
1590 /*
1591 * Do the work in place. Have the reading pointer `rd` start at
1592 * the end of the original string, and the writing pointer `wr`
1593 * start at the end of the new string, making sure to also put a
1594 * null character there.
1595 */
1596 rd = str + orig_len - 1;
1597 wr = str + new_len;
1598 *wr = '\0';
1599 wr--;
1600
1601 /*
1602 * Here's what the process looks like (3 digits per group):
1603 *
1604 * Source: 12345678
1605 * ^
1606 * Destination: 12345678#8
1607 * ^
1608 *
1609 * Source: 12345678
1610 * ^
1611 * Destination: 1234567878
1612 * ^
1613 *
1614 * Source: 12345678
1615 * ^
1616 * Destination: 1234567678
1617 * ^
1618 *
1619 * Source: 12345678
1620 * ^
1621 * Destination: 123456,678
1622 * ^
1623 *
1624 * Source: 12345678
1625 * ^
1626 * Destination: 123455,678
1627 * ^
1628 *
1629 * Source: 12345678
1630 * ^
1631 * Destination: 123445,678
1632 * ^
1633 *
1634 * Source: 12345678
1635 * ^
1636 * Destination: 123345,678
1637 * ^
1638 *
1639 * Source: 12345678
1640 * ^
1641 * Destination: 12,345,678
1642 * ^
1643 *
1644 * Source: 12345678
1645 * ^
1646 * Destination: 12,345,678
1647 * ^
1648 *
1649 * Source: 12345678
1650 * ^
1651 * Destination: 12,345,678
1652 * ^
1653 */
1654 while (rd != str - 1) {
1655 if (i == digits_per_group) {
1656 /*
1657 * Time to append the separator: decrement `wr`,
1658 * but keep `rd` as is.
1659 */
1660 i = 0;
1661 *wr = sep;
1662 wr--;
1663 continue;
1664 }
1665
1666 /* Copy read-side character to write-side character */
1667 *wr = *rd;
1668 wr--;
1669 rd--;
1670 i++;
1671 }
1672 }
1673
1674 BT_HIDDEN
1675 GString *bt_common_fold(const char *str, unsigned int total_length,
1676 unsigned int indent)
1677 {
1678 const unsigned int content_length = total_length - indent;
1679 GString *folded = g_string_new(NULL);
1680 GString *tmp_line = g_string_new(NULL);
1681 gchar **lines = NULL;
1682 gchar **line_words = NULL;
1683 gchar * const *line;
1684 unsigned int i;
1685
1686 BT_ASSERT(str);
1687 BT_ASSERT(indent < total_length);
1688 BT_ASSERT(tmp_line);
1689 BT_ASSERT(folded);
1690
1691 if (strlen(str) == 0) {
1692 /* Empty input string: empty output string */
1693 goto end;
1694 }
1695
1696 /* Split lines */
1697 lines = g_strsplit(str, "\n", 0);
1698 BT_ASSERT(lines);
1699
1700 /* For each source line */
1701 for (line = lines; *line; line++) {
1702 gchar * const *word;
1703
1704 /*
1705 * Append empty line without indenting if source line is
1706 * empty.
1707 */
1708 if (strlen(*line) == 0) {
1709 g_string_append_c(folded, '\n');
1710 continue;
1711 }
1712
1713 /* Split words */
1714 line_words = g_strsplit(*line, " ", 0);
1715 BT_ASSERT(line_words);
1716
1717 /*
1718 * Indent for first line (we know there's at least one
1719 * word at this point).
1720 */
1721 for (i = 0; i < indent; i++) {
1722 g_string_append_c(folded, ' ');
1723 }
1724
1725 /* Append words, folding when necessary */
1726 g_string_assign(tmp_line, "");
1727
1728 for (word = line_words; *word; word++) {
1729 /*
1730 * `tmp_line->len > 0` is in the condition so
1731 * that words that are larger than
1732 * `content_length` are at least written on
1733 * their own line.
1734 *
1735 * `tmp_line->len - 1` because the temporary
1736 * line always contains a trailing space which
1737 * won't be part of the line if we fold.
1738 */
1739 if (tmp_line->len > 0 &&
1740 tmp_line->len - 1 + strlen(*word) >= content_length) {
1741 /* Fold (without trailing space) */
1742 g_string_append_len(folded,
1743 tmp_line->str, tmp_line->len - 1);
1744 g_string_append_c(folded, '\n');
1745
1746 /* Indent new line */
1747 for (i = 0; i < indent; i++) {
1748 g_string_append_c(folded, ' ');
1749 }
1750
1751 g_string_assign(tmp_line, "");
1752 }
1753
1754 /* Append current word and space to temporary line */
1755 g_string_append(tmp_line, *word);
1756 g_string_append_c(tmp_line, ' ');
1757 }
1758
1759 /* Append last line if any, without trailing space */
1760 if (tmp_line->len > 0) {
1761 g_string_append_len(folded, tmp_line->str,
1762 tmp_line->len - 1);
1763 }
1764
1765 /* Append source newline */
1766 g_string_append_c(folded, '\n');
1767
1768 /* Free array of this line's words */
1769 g_strfreev(line_words);
1770 line_words = NULL;
1771 }
1772
1773 /* Remove trailing newline if any */
1774 if (folded->str[folded->len - 1] == '\n') {
1775 g_string_truncate(folded, folded->len - 1);
1776 }
1777
1778 end:
1779 if (lines) {
1780 g_strfreev(lines);
1781 }
1782
1783 if (line_words) {
1784 g_strfreev(line_words);
1785 }
1786
1787 if (tmp_line) {
1788 g_string_free(tmp_line, TRUE);
1789 }
1790
1791 return folded;
1792 }
1793
1794 #ifdef __MINGW32__
1795 BT_HIDDEN
1796 int bt_common_get_term_size(unsigned int *width, unsigned int *height)
1797 {
1798 /* Not supported on Windows yet */
1799 return -1;
1800 }
1801 #else /* __MINGW32__ */
1802 BT_HIDDEN
1803 int bt_common_get_term_size(unsigned int *width, unsigned int *height)
1804 {
1805 int ret = 0;
1806 struct winsize winsize;
1807
1808 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &winsize) < 0) {
1809 ret = -1;
1810 goto end;
1811 }
1812
1813 if (width) {
1814 *width = (unsigned int) winsize.ws_col;
1815 }
1816
1817 if (height) {
1818 *height = (unsigned int) winsize.ws_row;
1819 }
1820
1821 end:
1822 return ret;
1823 }
1824 #endif /* __MINGW32__ */
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