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60918275
LP		 1/*-*- Mode: C; c-basic-offset: 8 -*-*/
2
a7334b09
LP		 3/***
4 This file is part of systemd.
5
6 Copyright 2010 Lennart Poettering
7
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20***/
21
60918275
LP		 22#include <assert.h>
23#include <string.h>
24#include <unistd.h>
25#include <errno.h>
85261803 26#include <stdlib.h>
034c6ed7
LP		 27#include <signal.h>
28#include <stdio.h>
1dccbe19
LP		 29#include <syslog.h>
30#include <sched.h>
31#include <sys/resource.h>
ef886c6a 32#include <linux/sched.h>
a9f5d454
LP		 33#include <sys/types.h>
34#include <sys/stat.h>
3a0ecb08 35#include <fcntl.h>
60918275
LP		 36
37#include "macro.h"
38#include "util.h"
1dccbe19
LP		 39#include "ioprio.h"
40#include "missing.h"
a9f5d454 41#include "log.h"
65d2ebdc 42#include "strv.h"
60918275 43
47be870b 44usec_t now(clockid_t clock_id) {
60918275
LP		 45 struct timespec ts;
46
47be870b 47 assert_se(clock_gettime(clock_id, &ts) == 0);
60918275
LP		 48
49 return timespec_load(&ts);
50}
51
52usec_t timespec_load(const struct timespec *ts) {
53 assert(ts);
54
55 return
56 (usec_t) ts->tv_sec * USEC_PER_SEC +
57 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
58}
59
60struct timespec *timespec_store(struct timespec *ts, usec_t u) {
61 assert(ts);
62
63 ts->tv_sec = (time_t) (u / USEC_PER_SEC);
64 ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
65
66 return ts;
67}
68
69usec_t timeval_load(const struct timeval *tv) {
70 assert(tv);
71
72 return
73 (usec_t) tv->tv_sec * USEC_PER_SEC +
74 (usec_t) tv->tv_usec;
75}
76
77struct timeval *timeval_store(struct timeval *tv, usec_t u) {
78 assert(tv);
79
80 tv->tv_sec = (time_t) (u / USEC_PER_SEC);
81 tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
82
83 return tv;
84}
85
86bool endswith(const char *s, const char *postfix) {
87 size_t sl, pl;
88
89 assert(s);
90 assert(postfix);
91
92 sl = strlen(s);
93 pl = strlen(postfix);
94
95 if (sl < pl)
96 return false;
97
98 return memcmp(s + sl - pl, postfix, pl) == 0;
99}
100
101bool startswith(const char *s, const char *prefix) {
102 size_t sl, pl;
103
104 assert(s);
105 assert(prefix);
106
107 sl = strlen(s);
108 pl = strlen(prefix);
109
110 if (sl < pl)
111 return false;
112
113 return memcmp(s, prefix, pl) == 0;
114}
115
79d6d816
LP		 116bool first_word(const char *s, const char *word) {
117 size_t sl, wl;
118
119 assert(s);
120 assert(word);
121
122 sl = strlen(s);
123 wl = strlen(word);
124
125 if (sl < wl)
126 return false;
127
128 if (memcmp(s, word, wl) != 0)
129 return false;
130
131 return (s[wl] == 0 ||
132 strchr(WHITESPACE, s[wl]));
133}
134
42f4e3c4 135int close_nointr(int fd) {
60918275
LP		 136 assert(fd >= 0);
137
138 for (;;) {
139 int r;
140
141 if ((r = close(fd)) >= 0)
142 return r;
143
144 if (errno != EINTR)
145 return r;
146 }
147}
85261803 148
85f136b5
LP		 149void close_nointr_nofail(int fd) {
150
151 /* like close_nointr() but cannot fail, and guarantees errno
152 * is unchanged */
153
154 assert_se(close_nointr(fd) == 0);
155}
156
85261803
LP		 157int parse_boolean(const char *v) {
158 assert(v);
159
44d8db9e 160 if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on"))
85261803 161 return 1;
44d8db9e 162 else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off"))
85261803
LP		 163 return 0;
164
165 return -EINVAL;
166}
167
168int safe_atou(const char *s, unsigned *ret_u) {
169 char *x = NULL;
034c6ed7 170 unsigned long l;
85261803
LP		 171
172 assert(s);
173 assert(ret_u);
174
175 errno = 0;
176 l = strtoul(s, &x, 0);
177
178 if (!x || *x || errno)
179 return errno ? -errno : -EINVAL;
180
034c6ed7 181 if ((unsigned long) (unsigned) l != l)
85261803
LP		 182 return -ERANGE;
183
184 *ret_u = (unsigned) l;
185 return 0;
186}
187
188int safe_atoi(const char *s, int *ret_i) {
189 char *x = NULL;
034c6ed7 190 long l;
85261803
LP		 191
192 assert(s);
193 assert(ret_i);
194
195 errno = 0;
196 l = strtol(s, &x, 0);
197
198 if (!x || *x || errno)
199 return errno ? -errno : -EINVAL;
200
034c6ed7 201 if ((long) (int) l != l)
85261803
LP		 202 return -ERANGE;
203
034c6ed7
LP		 204 *ret_i = (int) l;
205 return 0;
206}
207
208int safe_atolu(const char *s, long unsigned *ret_lu) {
209 char *x = NULL;
210 unsigned long l;
211
212 assert(s);
213 assert(ret_lu);
214
215 errno = 0;
216 l = strtoul(s, &x, 0);
217
218 if (!x || *x || errno)
219 return errno ? -errno : -EINVAL;
220
221 *ret_lu = l;
222 return 0;
223}
224
225int safe_atoli(const char *s, long int *ret_li) {
226 char *x = NULL;
227 long l;
228
229 assert(s);
230 assert(ret_li);
231
232 errno = 0;
233 l = strtol(s, &x, 0);
234
235 if (!x || *x || errno)
236 return errno ? -errno : -EINVAL;
237
238 *ret_li = l;
239 return 0;
240}
241
242int safe_atollu(const char *s, long long unsigned *ret_llu) {
243 char *x = NULL;
244 unsigned long long l;
245
246 assert(s);
247 assert(ret_llu);
248
249 errno = 0;
250 l = strtoull(s, &x, 0);
251
252 if (!x || *x || errno)
253 return errno ? -errno : -EINVAL;
254
255 *ret_llu = l;
256 return 0;
257}
258
259int safe_atolli(const char *s, long long int *ret_lli) {
260 char *x = NULL;
261 long long l;
262
263 assert(s);
264 assert(ret_lli);
265
266 errno = 0;
267 l = strtoll(s, &x, 0);
268
269 if (!x || *x || errno)
270 return errno ? -errno : -EINVAL;
271
272 *ret_lli = l;
85261803
LP		 273 return 0;
274}
a41e8209 275
a41e8209 276/* Split a string into words. */
65d2ebdc 277char *split(const char *c, size_t *l, const char *separator, char **state) {
a41e8209
LP		 278 char *current;
279
280 current = *state ? *state : (char*) c;
281
282 if (!*current || *c == 0)
283 return NULL;
284
65d2ebdc
LP		 285 current += strspn(current, separator);
286 *l = strcspn(current, separator);
82919e3d
LP		 287 *state = current+*l;
288
289 return (char*) current;
290}
291
034c6ed7
LP		 292/* Split a string into words, but consider strings enclosed in '' and
293 * "" as words even if they include spaces. */
294char *split_quoted(const char *c, size_t *l, char **state) {
295 char *current;
296
297 current = *state ? *state : (char*) c;
298
299 if (!*current || *c == 0)
300 return NULL;
301
302 current += strspn(current, WHITESPACE);
303
304 if (*current == '\'') {
305 current ++;
306 *l = strcspn(current, "'");
307 *state = current+*l;
308
309 if (**state == '\'')
310 (*state)++;
311 } else if (*current == '\"') {
312 current ++;
b858b600 313 *l = strcspn(current, "\"");
034c6ed7
LP		 314 *state = current+*l;
315
316 if (**state == '\"')
317 (*state)++;
318 } else {
319 *l = strcspn(current, WHITESPACE);
320 *state = current+*l;
321 }
322
44d8db9e
LP		 323 /* FIXME: Cannot deal with strings that have spaces AND ticks
324 * in them */
325
034c6ed7
LP		 326 return (char*) current;
327}
328
65d2ebdc
LP		 329char **split_path_and_make_absolute(const char *p) {
330 char **l;
331 assert(p);
332
333 if (!(l = strv_split(p, ":")))
334 return NULL;
335
336 if (!strv_path_make_absolute_cwd(l)) {
337 strv_free(l);
338 return NULL;
339 }
340
341 return l;
342}
343
034c6ed7
LP		 344int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
345 int r;
346 FILE *f;
347 char fn[132], line[256], *p;
348 long long unsigned ppid;
349
350 assert(pid >= 0);
351 assert(_ppid);
352
353 assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%llu/stat", (unsigned long long) pid) < (int) (sizeof(fn)-1));
354 fn[sizeof(fn)-1] = 0;
355
356 if (!(f = fopen(fn, "r")))
357 return -errno;
358
359 if (!(fgets(line, sizeof(line), f))) {
360 r = -errno;
361 fclose(f);
362 return r;
363 }
364
365 fclose(f);
366
367 /* Let's skip the pid and comm fields. The latter is enclosed
368 * in () but does not escape any () in its value, so let's
369 * skip over it manually */
370
371 if (!(p = strrchr(line, ')')))
372 return -EIO;
373
374 p++;
375
376 if (sscanf(p, " "
377 "%*c " /* state */
378 "%llu ", /* ppid */
379 &ppid) != 1)
380 return -EIO;
381
382 if ((long long unsigned) (pid_t) ppid != ppid)
383 return -ERANGE;
384
385 *_ppid = (pid_t) ppid;
386
387 return 0;
388}
389
390int write_one_line_file(const char *fn, const char *line) {
391 FILE *f;
392 int r;
393
394 assert(fn);
395 assert(line);
396
397 if (!(f = fopen(fn, "we")))
398 return -errno;
399
400 if (fputs(line, f) < 0) {
401 r = -errno;
402 goto finish;
403 }
404
405 r = 0;
406finish:
407 fclose(f);
408 return r;
409}
410
411int read_one_line_file(const char *fn, char **line) {
412 FILE *f;
413 int r;
414 char t[64], *c;
415
416 assert(fn);
417 assert(line);
418
419 if (!(f = fopen(fn, "re")))
420 return -errno;
421
422 if (!(fgets(t, sizeof(t), f))) {
423 r = -errno;
424 goto finish;
425 }
426
427 if (!(c = strdup(t))) {
428 r = -ENOMEM;
429 goto finish;
430 }
431
432 *line = c;
433 r = 0;
434
435finish:
436 fclose(f);
437 return r;
438}
44d8db9e
LP		 439
440char *strappend(const char *s, const char *suffix) {
441 size_t a, b;
442 char *r;
443
444 assert(s);
445 assert(suffix);
446
447 a = strlen(s);
448 b = strlen(suffix);
449
450 if (!(r = new(char, a+b+1)))
451 return NULL;
452
453 memcpy(r, s, a);
454 memcpy(r+a, suffix, b);
455 r[a+b] = 0;
456
457 return r;
458}
87f0e418
LP		 459
460int readlink_malloc(const char *p, char **r) {
461 size_t l = 100;
462
463 assert(p);
464 assert(r);
465
466 for (;;) {
467 char *c;
468 ssize_t n;
469
470 if (!(c = new(char, l)))
471 return -ENOMEM;
472
473 if ((n = readlink(p, c, l-1)) < 0) {
474 int ret = -errno;
475 free(c);
476 return ret;
477 }
478
479 if ((size_t) n < l-1) {
480 c[n] = 0;
481 *r = c;
482 return 0;
483 }
484
485 free(c);
486 l *= 2;
487 }
488}
489
490char *file_name_from_path(const char *p) {
491 char *r;
492
493 assert(p);
494
495 if ((r = strrchr(p, '/')))
496 return r + 1;
497
498 return (char*) p;
499}
0301abf4
LP		 500
501bool path_is_absolute(const char *p) {
502 assert(p);
503
504 return p[0] == '/';
505}
506
507bool is_path(const char *p) {
508
509 return !!strchr(p, '/');
510}
511
512char *path_make_absolute(const char *p, const char *prefix) {
513 char *r;
514
515 assert(p);
516
65d2ebdc
LP		 517 /* Makes every item in the list an absolute path by prepending
518 * the prefix, if specified and necessary */
519
0301abf4
LP		 520 if (path_is_absolute(p) || !prefix)
521 return strdup(p);
522
523 if (asprintf(&r, "%s/%s", prefix, p) < 0)
524 return NULL;
525
526 return r;
527}
2a987ee8 528
65d2ebdc
LP		 529char *path_make_absolute_cwd(const char *p) {
530 char *cwd, *r;
531
532 assert(p);
533
534 /* Similar to path_make_absolute(), but prefixes with the
535 * current working directory. */
536
537 if (path_is_absolute(p))
538 return strdup(p);
539
540 if (!(cwd = get_current_dir_name()))
541 return NULL;
542
543 r = path_make_absolute(p, cwd);
544 free(cwd);
545
546 return r;
547}
548
549char **strv_path_make_absolute_cwd(char **l) {
550 char **s;
551
552 /* Goes through every item in the string list and makes it
553 * absolute. This works in place and won't rollback any
554 * changes on failure. */
555
556 STRV_FOREACH(s, l) {
557 char *t;
558
559 if (!(t = path_make_absolute_cwd(*s)))
560 return NULL;
561
562 free(*s);
563 *s = t;
564 }
565
566 return l;
567}
568
2a987ee8
LP		 569int reset_all_signal_handlers(void) {
570 int sig;
571
572 for (sig = 1; sig < _NSIG; sig++) {
573 struct sigaction sa;
574
575 if (sig == SIGKILL || sig == SIGSTOP)
576 continue;
577
578 zero(sa);
579 sa.sa_handler = SIG_DFL;
431c32bf 580 sa.sa_flags = SA_RESTART;
2a987ee8
LP		 581
582 /* On Linux the first two RT signals are reserved by
583 * glibc, and sigaction() will return EINVAL for them. */
584 if ((sigaction(sig, &sa, NULL) < 0))
585 if (errno != EINVAL)
586 return -errno;
587 }
588
8e274523 589 return 0;
2a987ee8 590}
4a72ff34
LP		 591
592char *strstrip(char *s) {
593 char *e, *l = NULL;
594
595 /* Drops trailing whitespace. Modifies the string in
596 * place. Returns pointer to first non-space character */
597
598 s += strspn(s, WHITESPACE);
599
600 for (e = s; *e; e++)
601 if (!strchr(WHITESPACE, *e))
602 l = e;
603
604 if (l)
605 *(l+1) = 0;
606 else
607 *s = 0;
608
609 return s;
610
611}
612
613char *file_in_same_dir(const char *path, const char *filename) {
614 char *e, *r;
615 size_t k;
616
617 assert(path);
618 assert(filename);
619
620 /* This removes the last component of path and appends
621 * filename, unless the latter is absolute anyway or the
622 * former isn't */
623
624 if (path_is_absolute(filename))
625 return strdup(filename);
626
627 if (!(e = strrchr(path, '/')))
628 return strdup(filename);
629
630 k = strlen(filename);
631 if (!(r = new(char, e-path+1+k+1)))
632 return NULL;
633
634 memcpy(r, path, e-path+1);
635 memcpy(r+(e-path)+1, filename, k+1);
636
637 return r;
638}
fb624d04 639
a9f5d454
LP		 640int mkdir_parents(const char *path, mode_t mode) {
641 const char *p, *e;
642
643 assert(path);
644
645 /* Creates every parent directory in the path except the last
646 * component. */
647
648 p = path + strspn(path, "/");
649 for (;;) {
650 int r;
651 char *t;
652
653 e = p + strcspn(p, "/");
654 p = e + strspn(e, "/");
655
656 /* Is this the last component? If so, then we're
657 * done */
658 if (*p == 0)
659 return 0;
660
661 if (!(t = strndup(path, e - path)))
662 return -ENOMEM;
663
664 r = mkdir(t, mode);
665
666 free(t);
667
668 if (r < 0 && errno != EEXIST)
669 return -errno;
670 }
671}
672
fb624d04
LP		 673char hexchar(int x) {
674 static const char table[16] = "0123456789abcdef";
675
676 return table[x & 15];
677}
4fe88d28
LP		 678
679int unhexchar(char c) {
680
681 if (c >= '0' && c <= '9')
682 return c - '0';
683
684 if (c >= 'a' && c <= 'f')
ea430986 685 return c - 'a' + 10;
4fe88d28
LP		 686
687 if (c >= 'A' && c <= 'F')
ea430986 688 return c - 'A' + 10;
4fe88d28
LP		 689
690 return -1;
691}
692
693char octchar(int x) {
694 return '0' + (x & 7);
695}
696
697int unoctchar(char c) {
698
699 if (c >= '0' && c <= '7')
700 return c - '0';
701
702 return -1;
703}
704
5af98f82
LP		 705char decchar(int x) {
706 return '0' + (x % 10);
707}
708
709int undecchar(char c) {
710
711 if (c >= '0' && c <= '9')
712 return c - '0';
713
714 return -1;
715}
716
4fe88d28
LP		 717char *cescape(const char *s) {
718 char *r, *t;
719 const char *f;
720
721 assert(s);
722
723 /* Does C style string escaping. */
724
725 if (!(r = new(char, strlen(s)*4 + 1)))
726 return NULL;
727
728 for (f = s, t = r; *f; f++)
729
730 switch (*f) {
731
732 case '\a':
733 *(t++) = '\\';
734 *(t++) = 'a';
735 break;
736 case '\b':
737 *(t++) = '\\';
738 *(t++) = 'b';
739 break;
740 case '\f':
741 *(t++) = '\\';
742 *(t++) = 'f';
743 break;
744 case '\n':
745 *(t++) = '\\';
746 *(t++) = 'n';
747 break;
748 case '\r':
749 *(t++) = '\\';
750 *(t++) = 'r';
751 break;
752 case '\t':
753 *(t++) = '\\';
754 *(t++) = 't';
755 break;
756 case '\v':
757 *(t++) = '\\';
758 *(t++) = 'v';
759 break;
760 case '\\':
761 *(t++) = '\\';
762 *(t++) = '\\';
763 break;
764 case '"':
765 *(t++) = '\\';
766 *(t++) = '"';
767 break;
768 case '\'':
769 *(t++) = '\\';
770 *(t++) = '\'';
771 break;
772
773 default:
774 /* For special chars we prefer octal over
775 * hexadecimal encoding, simply because glib's
776 * g_strescape() does the same */
777 if ((*f < ' ') || (*f >= 127)) {
778 *(t++) = '\\';
779 *(t++) = octchar((unsigned char) *f >> 6);
780 *(t++) = octchar((unsigned char) *f >> 3);
781 *(t++) = octchar((unsigned char) *f);
782 } else
783 *(t++) = *f;
784 break;
785 }
786
787 *t = 0;
788
789 return r;
790}
791
792char *cunescape(const char *s) {
793 char *r, *t;
794 const char *f;
795
796 assert(s);
797
798 /* Undoes C style string escaping */
799
800 if (!(r = new(char, strlen(s)+1)))
801 return r;
802
803 for (f = s, t = r; *f; f++) {
804
805 if (*f != '\\') {
806 *(t++) = *f;
807 continue;
808 }
809
810 f++;
811
812 switch (*f) {
813
814 case 'a':
815 *(t++) = '\a';
816 break;
817 case 'b':
818 *(t++) = '\b';
819 break;
820 case 'f':
821 *(t++) = '\f';
822 break;
823 case 'n':
824 *(t++) = '\n';
825 break;
826 case 'r':
827 *(t++) = '\r';
828 break;
829 case 't':
830 *(t++) = '\t';
831 break;
832 case 'v':
833 *(t++) = '\v';
834 break;
835 case '\\':
836 *(t++) = '\\';
837 break;
838 case '"':
839 *(t++) = '"';
840 break;
841 case '\'':
842 *(t++) = '\'';
843 break;
844
845 case 'x': {
846 /* hexadecimal encoding */
847 int a, b;
848
849 if ((a = unhexchar(f[1])) < 0 ||
850 (b = unhexchar(f[2])) < 0) {
851 /* Invalid escape code, let's take it literal then */
852 *(t++) = '\\';
853 *(t++) = 'x';
854 } else {
855 *(t++) = (char) ((a << 4) | b);
856 f += 2;
857 }
858
859 break;
860 }
861
862 case '0':
863 case '1':
864 case '2':
865 case '3':
866 case '4':
867 case '5':
868 case '6':
869 case '7': {
870 /* octal encoding */
871 int a, b, c;
872
873 if ((a = unoctchar(f[0])) < 0 ||
874 (b = unoctchar(f[1])) < 0 ||
875 (c = unoctchar(f[2])) < 0) {
876 /* Invalid escape code, let's take it literal then */
877 *(t++) = '\\';
878 *(t++) = f[0];
879 } else {
880 *(t++) = (char) ((a << 6) | (b << 3) | c);
881 f += 2;
882 }
883
884 break;
885 }
886
887 case 0:
888 /* premature end of string.*/
889 *(t++) = '\\';
890 goto finish;
891
892 default:
893 /* Invalid escape code, let's take it literal then */
894 *(t++) = '\\';
895 *(t++) = 'f';
896 break;
897 }
898 }
899
900finish:
901 *t = 0;
902 return r;
903}
904
905
906char *xescape(const char *s, const char *bad) {
907 char *r, *t;
908 const char *f;
909
910 /* Escapes all chars in bad, in addition to \ and all special
911 * chars, in \xFF style escaping. May be reversed with
912 * cunescape. */
913
914 if (!(r = new(char, strlen(s)*4+1)))
915 return NULL;
916
917 for (f = s, t = r; *f; f++) {
918
b866264a
LP		 919 if ((*f < ' ') || (*f >= 127) ||
920 (*f == '\\') || strchr(bad, *f)) {
4fe88d28
LP		 921 *(t++) = '\\';
922 *(t++) = 'x';
923 *(t++) = hexchar(*f >> 4);
924 *(t++) = hexchar(*f);
925 } else
926 *(t++) = *f;
927 }
928
929 *t = 0;
930
931 return r;
932}
933
ea430986 934char *bus_path_escape(const char *s) {
ea430986
LP		 935 char *r, *t;
936 const char *f;
937
47be870b
LP		 938 assert(s);
939
ea430986
LP		 940 /* Escapes all chars that D-Bus' object path cannot deal
941 * with. Can be reverse with bus_path_unescape() */
942
943 if (!(r = new(char, strlen(s)*3+1)))
944 return NULL;
945
946 for (f = s, t = r; *f; f++) {
947
948 if (!(*f >= 'A' && *f <= 'Z') &&
949 !(*f >= 'a' && *f <= 'z') &&
950 !(*f >= '0' && *f <= '9')) {
951 *(t++) = '_';
952 *(t++) = hexchar(*f >> 4);
953 *(t++) = hexchar(*f);
954 } else
955 *(t++) = *f;
956 }
957
958 *t = 0;
959
960 return r;
961}
962
963char *bus_path_unescape(const char *s) {
ea430986
LP		 964 char *r, *t;
965 const char *f;
966
47be870b
LP		 967 assert(s);
968
ea430986
LP		 969 if (!(r = new(char, strlen(s)+1)))
970 return NULL;
971
972 for (f = s, t = r; *f; f++) {
973
974 if (*f == '_') {
975 int a, b;
976
977 if ((a = unhexchar(f[1])) < 0 ||
978 (b = unhexchar(f[2])) < 0) {
979 /* Invalid escape code, let's take it literal then */
980 *(t++) = '_';
981 } else {
982 *(t++) = (char) ((a << 4) | b);
983 f += 2;
984 }
985 } else
986 *(t++) = *f;
987 }
988
989 *t = 0;
990
991 return r;
992}
993
4fe88d28
LP		 994char *path_kill_slashes(char *path) {
995 char *f, *t;
996 bool slash = false;
997
998 /* Removes redundant inner and trailing slashes. Modifies the
999 * passed string in-place.
1000 *
1001 * ///foo///bar/ becomes /foo/bar
1002 */
1003
1004 for (f = path, t = path; *f; f++) {
1005
1006 if (*f == '/') {
1007 slash = true;
1008 continue;
1009 }
1010
1011 if (slash) {
1012 slash = false;
1013 *(t++) = '/';
1014 }
1015
1016 *(t++) = *f;
1017 }
1018
1019 /* Special rule, if we are talking of the root directory, a
1020 trailing slash is good */
1021
1022 if (t == path && slash)
1023 *(t++) = '/';
1024
1025 *t = 0;
1026 return path;
1027}
1028
1029bool path_startswith(const char *path, const char *prefix) {
1030 assert(path);
1031 assert(prefix);
1032
1033 if ((path[0] == '/') != (prefix[0] == '/'))
1034 return false;
1035
1036 for (;;) {
1037 size_t a, b;
1038
1039 path += strspn(path, "/");
1040 prefix += strspn(prefix, "/");
1041
1042 if (*prefix == 0)
1043 return true;
1044
1045 if (*path == 0)
1046 return false;
1047
1048 a = strcspn(path, "/");
1049 b = strcspn(prefix, "/");
1050
1051 if (a != b)
1052 return false;
1053
1054 if (memcmp(path, prefix, a) != 0)
1055 return false;
1056
1057 path += a;
1058 prefix += b;
1059 }
1060}
1061
67d51650 1062char *ascii_strlower(char *t) {
4fe88d28
LP		 1063 char *p;
1064
67d51650 1065 assert(t);
4fe88d28 1066
67d51650 1067 for (p = t; *p; p++)
4fe88d28
LP		 1068 if (*p >= 'A' && *p <= 'Z')
1069 *p = *p - 'A' + 'a';
1070
67d51650 1071 return t;
4fe88d28 1072}
1dccbe19 1073
c85dc17b
LP		 1074bool ignore_file(const char *filename) {
1075 assert(filename);
1076
1077 return
1078 filename[0] == '.' ||
1079 endswith(filename, "~") ||
1080 endswith(filename, ".rpmnew") ||
1081 endswith(filename, ".rpmsave") ||
1082 endswith(filename, ".rpmorig") ||
1083 endswith(filename, ".dpkg-old") ||
1084 endswith(filename, ".dpkg-new") ||
1085 endswith(filename, ".swp");
1086}
1087
3a0ecb08
LP		 1088int fd_nonblock(int fd, bool nonblock) {
1089 int flags;
1090
1091 assert(fd >= 0);
1092
1093 if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
1094 return -errno;
1095
1096 if (nonblock)
1097 flags |= O_NONBLOCK;
1098 else
1099 flags &= ~O_NONBLOCK;
1100
1101 if (fcntl(fd, F_SETFL, flags) < 0)
1102 return -errno;
1103
1104 return 0;
1105}
1106
1107int fd_cloexec(int fd, bool cloexec) {
1108 int flags;
1109
1110 assert(fd >= 0);
1111
1112 if ((flags = fcntl(fd, F_GETFD, 0)) < 0)
1113 return -errno;
1114
1115 if (cloexec)
1116 flags |= FD_CLOEXEC;
1117 else
1118 flags &= ~FD_CLOEXEC;
1119
1120 if (fcntl(fd, F_SETFD, flags) < 0)
1121 return -errno;
1122
1123 return 0;
1124}
1125
1dccbe19
LP		 1126static const char *const ioprio_class_table[] = {
1127 [IOPRIO_CLASS_NONE] = "none",
1128 [IOPRIO_CLASS_RT] = "realtime",
1129 [IOPRIO_CLASS_BE] = "best-effort",
1130 [IOPRIO_CLASS_IDLE] = "idle"
1131};
1132
1133DEFINE_STRING_TABLE_LOOKUP(ioprio_class, int);
1134
1135static const char *const sigchld_code_table[] = {
1136 [CLD_EXITED] = "exited",
1137 [CLD_KILLED] = "killed",
1138 [CLD_DUMPED] = "dumped",
1139 [CLD_TRAPPED] = "trapped",
1140 [CLD_STOPPED] = "stopped",
1141 [CLD_CONTINUED] = "continued",
1142};
1143
1144DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
1145
1146static const char *const log_facility_table[LOG_NFACILITIES] = {
1147 [LOG_FAC(LOG_KERN)] = "kern",
1148 [LOG_FAC(LOG_USER)] = "user",
1149 [LOG_FAC(LOG_MAIL)] = "mail",
1150 [LOG_FAC(LOG_DAEMON)] = "daemon",
1151 [LOG_FAC(LOG_AUTH)] = "auth",
1152 [LOG_FAC(LOG_SYSLOG)] = "syslog",
1153 [LOG_FAC(LOG_LPR)] = "lpr",
1154 [LOG_FAC(LOG_NEWS)] = "news",
1155 [LOG_FAC(LOG_UUCP)] = "uucp",
1156 [LOG_FAC(LOG_CRON)] = "cron",
1157 [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
1158 [LOG_FAC(LOG_FTP)] = "ftp",
1159 [LOG_FAC(LOG_LOCAL0)] = "local0",
1160 [LOG_FAC(LOG_LOCAL1)] = "local1",
1161 [LOG_FAC(LOG_LOCAL2)] = "local2",
1162 [LOG_FAC(LOG_LOCAL3)] = "local3",
1163 [LOG_FAC(LOG_LOCAL4)] = "local4",
1164 [LOG_FAC(LOG_LOCAL5)] = "local5",
1165 [LOG_FAC(LOG_LOCAL6)] = "local6",
1166 [LOG_FAC(LOG_LOCAL7)] = "local7"
1167};
1168
1169DEFINE_STRING_TABLE_LOOKUP(log_facility, int);
1170
1171static const char *const log_level_table[] = {
1172 [LOG_EMERG] = "emerg",
1173 [LOG_ALERT] = "alert",
1174 [LOG_CRIT] = "crit",
1175 [LOG_ERR] = "err",
1176 [LOG_WARNING] = "warning",
1177 [LOG_NOTICE] = "notice",
1178 [LOG_INFO] = "info",
1179 [LOG_DEBUG] = "debug"
1180};
1181
1182DEFINE_STRING_TABLE_LOOKUP(log_level, int);
1183
1184static const char* const sched_policy_table[] = {
1185 [SCHED_OTHER] = "other",
1186 [SCHED_BATCH] = "batch",
1187 [SCHED_IDLE] = "idle",
1188 [SCHED_FIFO] = "fifo",
1189 [SCHED_RR] = "rr"
1190};
1191
1192DEFINE_STRING_TABLE_LOOKUP(sched_policy, int);
1193
1194static const char* const rlimit_table[] = {
1195 [RLIMIT_CPU] = "LimitCPU",
1196 [RLIMIT_FSIZE] = "LimitFSIZE",
1197 [RLIMIT_DATA] = "LimitDATA",
1198 [RLIMIT_STACK] = "LimitSTACK",
1199 [RLIMIT_CORE] = "LimitCORE",
1200 [RLIMIT_RSS] = "LimitRSS",
1201 [RLIMIT_NOFILE] = "LimitNOFILE",
1202 [RLIMIT_AS] = "LimitAS",
1203 [RLIMIT_NPROC] = "LimitNPROC",
1204 [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
1205 [RLIMIT_LOCKS] = "LimitLOCKS",
1206 [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
1207 [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
1208 [RLIMIT_NICE] = "LimitNICE",
1209 [RLIMIT_RTPRIO] = "LimitRTPRIO",
1210 [RLIMIT_RTTIME] = "LimitRTTIME"
1211};
1212
1213DEFINE_STRING_TABLE_LOOKUP(rlimit, int);
Michael's branch of systemd.