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07630cea LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
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 Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 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 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
11c3a366 TA |
22 | #include <errno.h> |
23 | #include <stdarg.h> | |
24 | #include <stdint.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | ||
b5efdb8a | 28 | #include "alloc-util.h" |
07630cea | 29 | #include "gunicode.h" |
11c3a366 | 30 | #include "macro.h" |
b11d6a7b | 31 | #include "string-util.h" |
07630cea LP |
32 | #include "utf8.h" |
33 | #include "util.h" | |
07630cea LP |
34 | |
35 | int strcmp_ptr(const char *a, const char *b) { | |
36 | ||
37 | /* Like strcmp(), but tries to make sense of NULL pointers */ | |
38 | if (a && b) | |
39 | return strcmp(a, b); | |
40 | ||
41 | if (!a && b) | |
42 | return -1; | |
43 | ||
44 | if (a && !b) | |
45 | return 1; | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
50 | char* endswith(const char *s, const char *postfix) { | |
51 | size_t sl, pl; | |
52 | ||
53 | assert(s); | |
54 | assert(postfix); | |
55 | ||
56 | sl = strlen(s); | |
57 | pl = strlen(postfix); | |
58 | ||
59 | if (pl == 0) | |
60 | return (char*) s + sl; | |
61 | ||
62 | if (sl < pl) | |
63 | return NULL; | |
64 | ||
65 | if (memcmp(s + sl - pl, postfix, pl) != 0) | |
66 | return NULL; | |
67 | ||
68 | return (char*) s + sl - pl; | |
69 | } | |
70 | ||
71 | char* endswith_no_case(const char *s, const char *postfix) { | |
72 | size_t sl, pl; | |
73 | ||
74 | assert(s); | |
75 | assert(postfix); | |
76 | ||
77 | sl = strlen(s); | |
78 | pl = strlen(postfix); | |
79 | ||
80 | if (pl == 0) | |
81 | return (char*) s + sl; | |
82 | ||
83 | if (sl < pl) | |
84 | return NULL; | |
85 | ||
86 | if (strcasecmp(s + sl - pl, postfix) != 0) | |
87 | return NULL; | |
88 | ||
89 | return (char*) s + sl - pl; | |
90 | } | |
91 | ||
92 | char* first_word(const char *s, const char *word) { | |
93 | size_t sl, wl; | |
94 | const char *p; | |
95 | ||
96 | assert(s); | |
97 | assert(word); | |
98 | ||
99 | /* Checks if the string starts with the specified word, either | |
100 | * followed by NUL or by whitespace. Returns a pointer to the | |
101 | * NUL or the first character after the whitespace. */ | |
102 | ||
103 | sl = strlen(s); | |
104 | wl = strlen(word); | |
105 | ||
106 | if (sl < wl) | |
107 | return NULL; | |
108 | ||
109 | if (wl == 0) | |
110 | return (char*) s; | |
111 | ||
112 | if (memcmp(s, word, wl) != 0) | |
113 | return NULL; | |
114 | ||
115 | p = s + wl; | |
116 | if (*p == 0) | |
117 | return (char*) p; | |
118 | ||
119 | if (!strchr(WHITESPACE, *p)) | |
120 | return NULL; | |
121 | ||
122 | p += strspn(p, WHITESPACE); | |
123 | return (char*) p; | |
124 | } | |
125 | ||
126 | static size_t strcspn_escaped(const char *s, const char *reject) { | |
127 | bool escaped = false; | |
128 | int n; | |
129 | ||
130 | for (n=0; s[n]; n++) { | |
131 | if (escaped) | |
132 | escaped = false; | |
133 | else if (s[n] == '\\') | |
134 | escaped = true; | |
135 | else if (strchr(reject, s[n])) | |
136 | break; | |
137 | } | |
138 | ||
139 | /* if s ends in \, return index of previous char */ | |
140 | return n - escaped; | |
141 | } | |
142 | ||
143 | /* Split a string into words. */ | |
144 | const char* split(const char **state, size_t *l, const char *separator, bool quoted) { | |
145 | const char *current; | |
146 | ||
147 | current = *state; | |
148 | ||
149 | if (!*current) { | |
150 | assert(**state == '\0'); | |
151 | return NULL; | |
152 | } | |
153 | ||
154 | current += strspn(current, separator); | |
155 | if (!*current) { | |
156 | *state = current; | |
157 | return NULL; | |
158 | } | |
159 | ||
160 | if (quoted && strchr("\'\"", *current)) { | |
161 | char quotechars[2] = {*current, '\0'}; | |
162 | ||
163 | *l = strcspn_escaped(current + 1, quotechars); | |
164 | if (current[*l + 1] == '\0' || current[*l + 1] != quotechars[0] || | |
165 | (current[*l + 2] && !strchr(separator, current[*l + 2]))) { | |
166 | /* right quote missing or garbage at the end */ | |
167 | *state = current; | |
168 | return NULL; | |
169 | } | |
170 | *state = current++ + *l + 2; | |
171 | } else if (quoted) { | |
172 | *l = strcspn_escaped(current, separator); | |
173 | if (current[*l] && !strchr(separator, current[*l])) { | |
174 | /* unfinished escape */ | |
175 | *state = current; | |
176 | return NULL; | |
177 | } | |
178 | *state = current + *l; | |
179 | } else { | |
180 | *l = strcspn(current, separator); | |
181 | *state = current + *l; | |
182 | } | |
183 | ||
184 | return current; | |
185 | } | |
186 | ||
187 | char *strnappend(const char *s, const char *suffix, size_t b) { | |
188 | size_t a; | |
189 | char *r; | |
190 | ||
191 | if (!s && !suffix) | |
192 | return strdup(""); | |
193 | ||
194 | if (!s) | |
195 | return strndup(suffix, b); | |
196 | ||
197 | if (!suffix) | |
198 | return strdup(s); | |
199 | ||
200 | assert(s); | |
201 | assert(suffix); | |
202 | ||
203 | a = strlen(s); | |
204 | if (b > ((size_t) -1) - a) | |
205 | return NULL; | |
206 | ||
207 | r = new(char, a+b+1); | |
208 | if (!r) | |
209 | return NULL; | |
210 | ||
211 | memcpy(r, s, a); | |
212 | memcpy(r+a, suffix, b); | |
213 | r[a+b] = 0; | |
214 | ||
215 | return r; | |
216 | } | |
217 | ||
218 | char *strappend(const char *s, const char *suffix) { | |
219 | return strnappend(s, suffix, suffix ? strlen(suffix) : 0); | |
220 | } | |
221 | ||
222 | char *strjoin(const char *x, ...) { | |
223 | va_list ap; | |
224 | size_t l; | |
225 | char *r, *p; | |
226 | ||
227 | va_start(ap, x); | |
228 | ||
229 | if (x) { | |
230 | l = strlen(x); | |
231 | ||
232 | for (;;) { | |
233 | const char *t; | |
234 | size_t n; | |
235 | ||
236 | t = va_arg(ap, const char *); | |
237 | if (!t) | |
238 | break; | |
239 | ||
240 | n = strlen(t); | |
241 | if (n > ((size_t) -1) - l) { | |
242 | va_end(ap); | |
243 | return NULL; | |
244 | } | |
245 | ||
246 | l += n; | |
247 | } | |
248 | } else | |
249 | l = 0; | |
250 | ||
251 | va_end(ap); | |
252 | ||
253 | r = new(char, l+1); | |
254 | if (!r) | |
255 | return NULL; | |
256 | ||
257 | if (x) { | |
258 | p = stpcpy(r, x); | |
259 | ||
260 | va_start(ap, x); | |
261 | ||
262 | for (;;) { | |
263 | const char *t; | |
264 | ||
265 | t = va_arg(ap, const char *); | |
266 | if (!t) | |
267 | break; | |
268 | ||
269 | p = stpcpy(p, t); | |
270 | } | |
271 | ||
272 | va_end(ap); | |
273 | } else | |
274 | r[0] = 0; | |
275 | ||
276 | return r; | |
277 | } | |
278 | ||
279 | char *strstrip(char *s) { | |
280 | char *e; | |
281 | ||
282 | /* Drops trailing whitespace. Modifies the string in | |
283 | * place. Returns pointer to first non-space character */ | |
284 | ||
285 | s += strspn(s, WHITESPACE); | |
286 | ||
287 | for (e = strchr(s, 0); e > s; e --) | |
288 | if (!strchr(WHITESPACE, e[-1])) | |
289 | break; | |
290 | ||
291 | *e = 0; | |
292 | ||
293 | return s; | |
294 | } | |
295 | ||
296 | char *delete_chars(char *s, const char *bad) { | |
297 | char *f, *t; | |
298 | ||
299 | /* Drops all whitespace, regardless where in the string */ | |
300 | ||
301 | for (f = s, t = s; *f; f++) { | |
302 | if (strchr(bad, *f)) | |
303 | continue; | |
304 | ||
305 | *(t++) = *f; | |
306 | } | |
307 | ||
308 | *t = 0; | |
309 | ||
310 | return s; | |
311 | } | |
312 | ||
313 | char *truncate_nl(char *s) { | |
314 | assert(s); | |
315 | ||
316 | s[strcspn(s, NEWLINE)] = 0; | |
317 | return s; | |
318 | } | |
319 | ||
b577e3d5 LP |
320 | char ascii_tolower(char x) { |
321 | ||
322 | if (x >= 'A' && x <= 'Z') | |
323 | return x - 'A' + 'a'; | |
324 | ||
325 | return x; | |
326 | } | |
327 | ||
07630cea LP |
328 | char *ascii_strlower(char *t) { |
329 | char *p; | |
330 | ||
331 | assert(t); | |
332 | ||
333 | for (p = t; *p; p++) | |
b577e3d5 LP |
334 | *p = ascii_tolower(*p); |
335 | ||
336 | return t; | |
337 | } | |
338 | ||
339 | char *ascii_strlower_n(char *t, size_t n) { | |
340 | size_t i; | |
341 | ||
342 | if (n <= 0) | |
343 | return t; | |
344 | ||
345 | for (i = 0; i < n; i++) | |
346 | t[i] = ascii_tolower(t[i]); | |
07630cea LP |
347 | |
348 | return t; | |
349 | } | |
522d85ae LP |
350 | |
351 | int ascii_strcasecmp_n(const char *a, const char *b, size_t n) { | |
352 | ||
353 | for (; n > 0; a++, b++, n--) { | |
354 | int x, y; | |
355 | ||
356 | x = (int) (uint8_t) ascii_tolower(*a); | |
357 | y = (int) (uint8_t) ascii_tolower(*b); | |
358 | ||
359 | if (x != y) | |
360 | return x - y; | |
361 | } | |
362 | ||
363 | return 0; | |
364 | } | |
c1749834 LP |
365 | |
366 | int ascii_strcasecmp_nn(const char *a, size_t n, const char *b, size_t m) { | |
367 | int r; | |
368 | ||
369 | r = ascii_strcasecmp_n(a, b, MIN(n, m)); | |
370 | if (r != 0) | |
371 | return r; | |
372 | ||
373 | if (n < m) | |
374 | return -1; | |
375 | else if (n > m) | |
376 | return 1; | |
377 | else | |
378 | return 0; | |
379 | } | |
07630cea LP |
380 | |
381 | bool chars_intersect(const char *a, const char *b) { | |
382 | const char *p; | |
383 | ||
384 | /* Returns true if any of the chars in a are in b. */ | |
385 | for (p = a; *p; p++) | |
386 | if (strchr(b, *p)) | |
387 | return true; | |
388 | ||
389 | return false; | |
390 | } | |
391 | ||
392 | bool string_has_cc(const char *p, const char *ok) { | |
393 | const char *t; | |
394 | ||
395 | assert(p); | |
396 | ||
397 | /* | |
398 | * Check if a string contains control characters. If 'ok' is | |
399 | * non-NULL it may be a string containing additional CCs to be | |
400 | * considered OK. | |
401 | */ | |
402 | ||
403 | for (t = p; *t; t++) { | |
404 | if (ok && strchr(ok, *t)) | |
405 | continue; | |
406 | ||
407 | if (*t > 0 && *t < ' ') | |
408 | return true; | |
409 | ||
410 | if (*t == 127) | |
411 | return true; | |
412 | } | |
413 | ||
414 | return false; | |
415 | } | |
416 | ||
417 | static char *ascii_ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) { | |
418 | size_t x; | |
419 | char *r; | |
420 | ||
421 | assert(s); | |
422 | assert(percent <= 100); | |
423 | assert(new_length >= 3); | |
424 | ||
425 | if (old_length <= 3 || old_length <= new_length) | |
426 | return strndup(s, old_length); | |
427 | ||
428 | r = new0(char, new_length+1); | |
429 | if (!r) | |
430 | return NULL; | |
431 | ||
432 | x = (new_length * percent) / 100; | |
433 | ||
434 | if (x > new_length - 3) | |
435 | x = new_length - 3; | |
436 | ||
437 | memcpy(r, s, x); | |
438 | r[x] = '.'; | |
439 | r[x+1] = '.'; | |
440 | r[x+2] = '.'; | |
441 | memcpy(r + x + 3, | |
442 | s + old_length - (new_length - x - 3), | |
443 | new_length - x - 3); | |
444 | ||
445 | return r; | |
446 | } | |
447 | ||
448 | char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) { | |
449 | size_t x; | |
450 | char *e; | |
451 | const char *i, *j; | |
452 | unsigned k, len, len2; | |
453 | ||
454 | assert(s); | |
455 | assert(percent <= 100); | |
456 | assert(new_length >= 3); | |
457 | ||
458 | /* if no multibyte characters use ascii_ellipsize_mem for speed */ | |
459 | if (ascii_is_valid(s)) | |
460 | return ascii_ellipsize_mem(s, old_length, new_length, percent); | |
461 | ||
462 | if (old_length <= 3 || old_length <= new_length) | |
463 | return strndup(s, old_length); | |
464 | ||
465 | x = (new_length * percent) / 100; | |
466 | ||
467 | if (x > new_length - 3) | |
468 | x = new_length - 3; | |
469 | ||
470 | k = 0; | |
471 | for (i = s; k < x && i < s + old_length; i = utf8_next_char(i)) { | |
dcd12626 | 472 | int c; |
07630cea LP |
473 | |
474 | c = utf8_encoded_to_unichar(i); | |
475 | if (c < 0) | |
476 | return NULL; | |
477 | k += unichar_iswide(c) ? 2 : 1; | |
478 | } | |
479 | ||
480 | if (k > x) /* last character was wide and went over quota */ | |
481 | x ++; | |
482 | ||
483 | for (j = s + old_length; k < new_length && j > i; ) { | |
dcd12626 | 484 | int c; |
07630cea LP |
485 | |
486 | j = utf8_prev_char(j); | |
487 | c = utf8_encoded_to_unichar(j); | |
488 | if (c < 0) | |
489 | return NULL; | |
490 | k += unichar_iswide(c) ? 2 : 1; | |
491 | } | |
492 | assert(i <= j); | |
493 | ||
494 | /* we don't actually need to ellipsize */ | |
495 | if (i == j) | |
496 | return memdup(s, old_length + 1); | |
497 | ||
498 | /* make space for ellipsis */ | |
499 | j = utf8_next_char(j); | |
500 | ||
501 | len = i - s; | |
502 | len2 = s + old_length - j; | |
503 | e = new(char, len + 3 + len2 + 1); | |
504 | if (!e) | |
505 | return NULL; | |
506 | ||
507 | /* | |
508 | printf("old_length=%zu new_length=%zu x=%zu len=%u len2=%u k=%u\n", | |
509 | old_length, new_length, x, len, len2, k); | |
510 | */ | |
511 | ||
512 | memcpy(e, s, len); | |
513 | e[len] = 0xe2; /* tri-dot ellipsis: … */ | |
514 | e[len + 1] = 0x80; | |
515 | e[len + 2] = 0xa6; | |
516 | ||
517 | memcpy(e + len + 3, j, len2 + 1); | |
518 | ||
519 | return e; | |
520 | } | |
521 | ||
522 | char *ellipsize(const char *s, size_t length, unsigned percent) { | |
523 | return ellipsize_mem(s, strlen(s), length, percent); | |
524 | } | |
525 | ||
526 | bool nulstr_contains(const char*nulstr, const char *needle) { | |
527 | const char *i; | |
528 | ||
529 | if (!nulstr) | |
530 | return false; | |
531 | ||
532 | NULSTR_FOREACH(i, nulstr) | |
533 | if (streq(i, needle)) | |
534 | return true; | |
535 | ||
536 | return false; | |
537 | } | |
538 | ||
539 | char* strshorten(char *s, size_t l) { | |
540 | assert(s); | |
541 | ||
542 | if (l < strlen(s)) | |
543 | s[l] = 0; | |
544 | ||
545 | return s; | |
546 | } | |
547 | ||
548 | char *strreplace(const char *text, const char *old_string, const char *new_string) { | |
549 | const char *f; | |
550 | char *t, *r; | |
551 | size_t l, old_len, new_len; | |
552 | ||
553 | assert(text); | |
554 | assert(old_string); | |
555 | assert(new_string); | |
556 | ||
557 | old_len = strlen(old_string); | |
558 | new_len = strlen(new_string); | |
559 | ||
560 | l = strlen(text); | |
561 | r = new(char, l+1); | |
562 | if (!r) | |
563 | return NULL; | |
564 | ||
565 | f = text; | |
566 | t = r; | |
567 | while (*f) { | |
568 | char *a; | |
569 | size_t d, nl; | |
570 | ||
571 | if (!startswith(f, old_string)) { | |
572 | *(t++) = *(f++); | |
573 | continue; | |
574 | } | |
575 | ||
576 | d = t - r; | |
577 | nl = l - old_len + new_len; | |
578 | a = realloc(r, nl + 1); | |
579 | if (!a) | |
580 | goto oom; | |
581 | ||
582 | l = nl; | |
583 | r = a; | |
584 | t = r + d; | |
585 | ||
586 | t = stpcpy(t, new_string); | |
587 | f += old_len; | |
588 | } | |
589 | ||
590 | *t = 0; | |
591 | return r; | |
592 | ||
593 | oom: | |
594 | free(r); | |
595 | return NULL; | |
596 | } | |
597 | ||
598 | char *strip_tab_ansi(char **ibuf, size_t *_isz) { | |
599 | const char *i, *begin = NULL; | |
600 | enum { | |
601 | STATE_OTHER, | |
602 | STATE_ESCAPE, | |
603 | STATE_BRACKET | |
604 | } state = STATE_OTHER; | |
605 | char *obuf = NULL; | |
606 | size_t osz = 0, isz; | |
607 | FILE *f; | |
608 | ||
609 | assert(ibuf); | |
610 | assert(*ibuf); | |
611 | ||
612 | /* Strips ANSI color and replaces TABs by 8 spaces */ | |
613 | ||
614 | isz = _isz ? *_isz : strlen(*ibuf); | |
615 | ||
616 | f = open_memstream(&obuf, &osz); | |
617 | if (!f) | |
618 | return NULL; | |
619 | ||
620 | for (i = *ibuf; i < *ibuf + isz + 1; i++) { | |
621 | ||
622 | switch (state) { | |
623 | ||
624 | case STATE_OTHER: | |
625 | if (i >= *ibuf + isz) /* EOT */ | |
626 | break; | |
627 | else if (*i == '\x1B') | |
628 | state = STATE_ESCAPE; | |
629 | else if (*i == '\t') | |
630 | fputs(" ", f); | |
631 | else | |
632 | fputc(*i, f); | |
633 | break; | |
634 | ||
635 | case STATE_ESCAPE: | |
636 | if (i >= *ibuf + isz) { /* EOT */ | |
637 | fputc('\x1B', f); | |
638 | break; | |
639 | } else if (*i == '[') { | |
640 | state = STATE_BRACKET; | |
641 | begin = i + 1; | |
642 | } else { | |
643 | fputc('\x1B', f); | |
644 | fputc(*i, f); | |
645 | state = STATE_OTHER; | |
646 | } | |
647 | ||
648 | break; | |
649 | ||
650 | case STATE_BRACKET: | |
651 | ||
652 | if (i >= *ibuf + isz || /* EOT */ | |
653 | (!(*i >= '0' && *i <= '9') && *i != ';' && *i != 'm')) { | |
654 | fputc('\x1B', f); | |
655 | fputc('[', f); | |
656 | state = STATE_OTHER; | |
657 | i = begin-1; | |
658 | } else if (*i == 'm') | |
659 | state = STATE_OTHER; | |
660 | break; | |
661 | } | |
662 | } | |
663 | ||
664 | if (ferror(f)) { | |
665 | fclose(f); | |
666 | free(obuf); | |
667 | return NULL; | |
668 | } | |
669 | ||
670 | fclose(f); | |
671 | ||
672 | free(*ibuf); | |
673 | *ibuf = obuf; | |
674 | ||
675 | if (_isz) | |
676 | *_isz = osz; | |
677 | ||
678 | return obuf; | |
679 | } | |
680 | ||
681 | char *strextend(char **x, ...) { | |
682 | va_list ap; | |
683 | size_t f, l; | |
684 | char *r, *p; | |
685 | ||
686 | assert(x); | |
687 | ||
688 | l = f = *x ? strlen(*x) : 0; | |
689 | ||
690 | va_start(ap, x); | |
691 | for (;;) { | |
692 | const char *t; | |
693 | size_t n; | |
694 | ||
695 | t = va_arg(ap, const char *); | |
696 | if (!t) | |
697 | break; | |
698 | ||
699 | n = strlen(t); | |
700 | if (n > ((size_t) -1) - l) { | |
701 | va_end(ap); | |
702 | return NULL; | |
703 | } | |
704 | ||
705 | l += n; | |
706 | } | |
707 | va_end(ap); | |
708 | ||
709 | r = realloc(*x, l+1); | |
710 | if (!r) | |
711 | return NULL; | |
712 | ||
713 | p = r + f; | |
714 | ||
715 | va_start(ap, x); | |
716 | for (;;) { | |
717 | const char *t; | |
718 | ||
719 | t = va_arg(ap, const char *); | |
720 | if (!t) | |
721 | break; | |
722 | ||
723 | p = stpcpy(p, t); | |
724 | } | |
725 | va_end(ap); | |
726 | ||
727 | *p = 0; | |
728 | *x = r; | |
729 | ||
730 | return r + l; | |
731 | } | |
732 | ||
733 | char *strrep(const char *s, unsigned n) { | |
734 | size_t l; | |
735 | char *r, *p; | |
736 | unsigned i; | |
737 | ||
738 | assert(s); | |
739 | ||
740 | l = strlen(s); | |
741 | p = r = malloc(l * n + 1); | |
742 | if (!r) | |
743 | return NULL; | |
744 | ||
745 | for (i = 0; i < n; i++) | |
746 | p = stpcpy(p, s); | |
747 | ||
748 | *p = 0; | |
749 | return r; | |
750 | } | |
751 | ||
752 | int split_pair(const char *s, const char *sep, char **l, char **r) { | |
753 | char *x, *a, *b; | |
754 | ||
755 | assert(s); | |
756 | assert(sep); | |
757 | assert(l); | |
758 | assert(r); | |
759 | ||
760 | if (isempty(sep)) | |
761 | return -EINVAL; | |
762 | ||
763 | x = strstr(s, sep); | |
764 | if (!x) | |
765 | return -EINVAL; | |
766 | ||
767 | a = strndup(s, x - s); | |
768 | if (!a) | |
769 | return -ENOMEM; | |
770 | ||
771 | b = strdup(x + strlen(sep)); | |
772 | if (!b) { | |
773 | free(a); | |
774 | return -ENOMEM; | |
775 | } | |
776 | ||
777 | *l = a; | |
778 | *r = b; | |
779 | ||
780 | return 0; | |
781 | } | |
782 | ||
783 | int free_and_strdup(char **p, const char *s) { | |
784 | char *t; | |
785 | ||
786 | assert(p); | |
787 | ||
788 | /* Replaces a string pointer with an strdup()ed new string, | |
789 | * possibly freeing the old one. */ | |
790 | ||
791 | if (streq_ptr(*p, s)) | |
792 | return 0; | |
793 | ||
794 | if (s) { | |
795 | t = strdup(s); | |
796 | if (!t) | |
797 | return -ENOMEM; | |
798 | } else | |
799 | t = NULL; | |
800 | ||
801 | free(*p); | |
802 | *p = t; | |
803 | ||
804 | return 1; | |
805 | } | |
806 | ||
9fe4ea21 LP |
807 | #pragma GCC push_options |
808 | #pragma GCC optimize("O0") | |
809 | ||
810 | void* memory_erase(void *p, size_t l) { | |
811 | volatile uint8_t* x = (volatile uint8_t*) p; | |
812 | ||
813 | /* This basically does what memset() does, but hopefully isn't | |
814 | * optimized away by the compiler. One of those days, when | |
815 | * glibc learns memset_s() we should replace this call by | |
816 | * memset_s(), but until then this has to do. */ | |
817 | ||
818 | for (; l > 0; l--) | |
819 | *(x++) = 'x'; | |
820 | ||
821 | return p; | |
822 | } | |
823 | ||
824 | #pragma GCC pop_options | |
825 | ||
826 | char* string_erase(char *x) { | |
07630cea LP |
827 | |
828 | if (!x) | |
9fe4ea21 | 829 | return NULL; |
07630cea LP |
830 | |
831 | /* A delicious drop of snake-oil! To be called on memory where | |
832 | * we stored passphrases or so, after we used them. */ | |
833 | ||
9fe4ea21 | 834 | return memory_erase(x, strlen(x)); |
07630cea LP |
835 | } |
836 | ||
837 | char *string_free_erase(char *s) { | |
9fe4ea21 | 838 | return mfree(string_erase(s)); |
07630cea | 839 | } |
f3e2e81d LP |
840 | |
841 | bool string_is_safe(const char *p) { | |
842 | const char *t; | |
843 | ||
844 | if (!p) | |
845 | return false; | |
846 | ||
847 | for (t = p; *t; t++) { | |
848 | if (*t > 0 && *t < ' ') /* no control characters */ | |
849 | return false; | |
850 | ||
851 | if (strchr(QUOTES "\\\x7f", *t)) | |
852 | return false; | |
853 | } | |
854 | ||
855 | return true; | |
856 | } |