2 This file is part of systemd.
4 Copyright 2010 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include "alloc-util.h"
29 #include "string-util.h"
33 int strcmp_ptr(const char *a, const char *b) {
35 /* Like strcmp(), but tries to make sense of NULL pointers */
48 char* endswith(const char *s, const char *postfix) {
58 return (char*) s + sl;
63 if (memcmp(s + sl - pl, postfix, pl) != 0)
66 return (char*) s + sl - pl;
69 char* endswith_no_case(const char *s, const char *postfix) {
79 return (char*) s + sl;
84 if (strcasecmp(s + sl - pl, postfix) != 0)
87 return (char*) s + sl - pl;
90 char* first_word(const char *s, const char *word) {
97 /* Checks if the string starts with the specified word, either
98 * followed by NUL or by whitespace. Returns a pointer to the
99 * NUL or the first character after the whitespace. */
110 if (memcmp(s, word, wl) != 0)
117 if (!strchr(WHITESPACE, *p))
120 p += strspn(p, WHITESPACE);
124 static size_t strcspn_escaped(const char *s, const char *reject) {
125 bool escaped = false;
128 for (n=0; s[n]; n++) {
131 else if (s[n] == '\\')
133 else if (strchr(reject, s[n]))
137 /* if s ends in \, return index of previous char */
141 /* Split a string into words. */
142 const char* split(const char **state, size_t *l, const char *separator, bool quoted) {
148 assert(**state == '\0');
152 current += strspn(current, separator);
158 if (quoted && strchr("\'\"", *current)) {
159 char quotechars[2] = {*current, '\0'};
161 *l = strcspn_escaped(current + 1, quotechars);
162 if (current[*l + 1] == '\0' || current[*l + 1] != quotechars[0] ||
163 (current[*l + 2] && !strchr(separator, current[*l + 2]))) {
164 /* right quote missing or garbage at the end */
168 *state = current++ + *l + 2;
170 *l = strcspn_escaped(current, separator);
171 if (current[*l] && !strchr(separator, current[*l])) {
172 /* unfinished escape */
176 *state = current + *l;
178 *l = strcspn(current, separator);
179 *state = current + *l;
185 char *strnappend(const char *s, const char *suffix, size_t b) {
193 return strndup(suffix, b);
202 if (b > ((size_t) -1) - a)
205 r = new(char, a+b+1);
210 memcpy(r+a, suffix, b);
216 char *strappend(const char *s, const char *suffix) {
217 return strnappend(s, suffix, suffix ? strlen(suffix) : 0);
220 char *strjoin(const char *x, ...) {
234 t = va_arg(ap, const char *);
239 if (n > ((size_t) -1) - l) {
263 t = va_arg(ap, const char *);
277 char *strstrip(char *s) {
280 /* Drops trailing whitespace. Modifies the string in
281 * place. Returns pointer to first non-space character */
283 s += strspn(s, WHITESPACE);
285 for (e = strchr(s, 0); e > s; e --)
286 if (!strchr(WHITESPACE, e[-1]))
294 char *delete_chars(char *s, const char *bad) {
297 /* Drops all whitespace, regardless where in the string */
299 for (f = s, t = s; *f; f++) {
311 char *truncate_nl(char *s) {
314 s[strcspn(s, NEWLINE)] = 0;
318 char ascii_tolower(char x) {
320 if (x >= 'A' && x <= 'Z')
321 return x - 'A' + 'a';
326 char *ascii_strlower(char *t) {
332 *p = ascii_tolower(*p);
337 char *ascii_strlower_n(char *t, size_t n) {
343 for (i = 0; i < n; i++)
344 t[i] = ascii_tolower(t[i]);
349 int ascii_strcasecmp_n(const char *a, const char *b, size_t n) {
351 for (; n > 0; a++, b++, n--) {
354 x = (int) (uint8_t) ascii_tolower(*a);
355 y = (int) (uint8_t) ascii_tolower(*b);
364 int ascii_strcasecmp_nn(const char *a, size_t n, const char *b, size_t m) {
367 r = ascii_strcasecmp_n(a, b, MIN(n, m));
379 bool chars_intersect(const char *a, const char *b) {
382 /* Returns true if any of the chars in a are in b. */
390 bool string_has_cc(const char *p, const char *ok) {
396 * Check if a string contains control characters. If 'ok' is
397 * non-NULL it may be a string containing additional CCs to be
401 for (t = p; *t; t++) {
402 if (ok && strchr(ok, *t))
405 if (*t > 0 && *t < ' ')
415 static char *ascii_ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) {
420 assert(percent <= 100);
421 assert(new_length >= 3);
423 if (old_length <= 3 || old_length <= new_length)
424 return strndup(s, old_length);
426 r = new0(char, new_length+1);
430 x = (new_length * percent) / 100;
432 if (x > new_length - 3)
440 s + old_length - (new_length - x - 3),
446 char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) {
450 unsigned k, len, len2;
454 assert(percent <= 100);
455 assert(new_length >= 3);
457 /* if no multibyte characters use ascii_ellipsize_mem for speed */
458 if (ascii_is_valid(s))
459 return ascii_ellipsize_mem(s, old_length, new_length, percent);
461 if (old_length <= 3 || old_length <= new_length)
462 return strndup(s, old_length);
464 x = (new_length * percent) / 100;
466 if (x > new_length - 3)
470 for (i = s; k < x && i < s + old_length; i = utf8_next_char(i)) {
473 r = utf8_encoded_to_unichar(i, &c);
476 k += unichar_iswide(c) ? 2 : 1;
479 if (k > x) /* last character was wide and went over quota */
482 for (j = s + old_length; k < new_length && j > i; ) {
485 j = utf8_prev_char(j);
486 r = utf8_encoded_to_unichar(j, &c);
489 k += unichar_iswide(c) ? 2 : 1;
493 /* we don't actually need to ellipsize */
495 return memdup(s, old_length + 1);
497 /* make space for ellipsis */
498 j = utf8_next_char(j);
501 len2 = s + old_length - j;
502 e = new(char, len + 3 + len2 + 1);
507 printf("old_length=%zu new_length=%zu x=%zu len=%u len2=%u k=%u\n",
508 old_length, new_length, x, len, len2, k);
512 e[len] = 0xe2; /* tri-dot ellipsis: … */
516 memcpy(e + len + 3, j, len2 + 1);
521 char *ellipsize(const char *s, size_t length, unsigned percent) {
522 return ellipsize_mem(s, strlen(s), length, percent);
525 bool nulstr_contains(const char*nulstr, const char *needle) {
531 NULSTR_FOREACH(i, nulstr)
532 if (streq(i, needle))
538 char* strshorten(char *s, size_t l) {
547 char *strreplace(const char *text, const char *old_string, const char *new_string) {
550 size_t l, old_len, new_len;
556 old_len = strlen(old_string);
557 new_len = strlen(new_string);
570 if (!startswith(f, old_string)) {
576 nl = l - old_len + new_len;
577 a = realloc(r, nl + 1);
585 t = stpcpy(t, new_string);
597 char *strip_tab_ansi(char **ibuf, size_t *_isz) {
598 const char *i, *begin = NULL;
603 } state = STATE_OTHER;
611 /* Strips ANSI color and replaces TABs by 8 spaces */
613 isz = _isz ? *_isz : strlen(*ibuf);
615 f = open_memstream(&obuf, &osz);
619 for (i = *ibuf; i < *ibuf + isz + 1; i++) {
624 if (i >= *ibuf + isz) /* EOT */
626 else if (*i == '\x1B')
627 state = STATE_ESCAPE;
635 if (i >= *ibuf + isz) { /* EOT */
638 } else if (*i == '[') {
639 state = STATE_BRACKET;
651 if (i >= *ibuf + isz || /* EOT */
652 (!(*i >= '0' && *i <= '9') && *i != ';' && *i != 'm')) {
657 } else if (*i == 'm')
680 char *strextend(char **x, ...) {
687 l = f = *x ? strlen(*x) : 0;
694 t = va_arg(ap, const char *);
699 if (n > ((size_t) -1) - l) {
708 r = realloc(*x, l+1);
718 t = va_arg(ap, const char *);
732 char *strrep(const char *s, unsigned n) {
740 p = r = malloc(l * n + 1);
744 for (i = 0; i < n; i++)
751 int split_pair(const char *s, const char *sep, char **l, char **r) {
766 a = strndup(s, x - s);
770 b = strdup(x + strlen(sep));
782 int free_and_strdup(char **p, const char *s) {
787 /* Replaces a string pointer with an strdup()ed new string,
788 * possibly freeing the old one. */
790 if (streq_ptr(*p, s))
806 #pragma GCC push_options
807 #pragma GCC optimize("O0")
809 void* memory_erase(void *p, size_t l) {
810 volatile uint8_t* x = (volatile uint8_t*) p;
812 /* This basically does what memset() does, but hopefully isn't
813 * optimized away by the compiler. One of those days, when
814 * glibc learns memset_s() we should replace this call by
815 * memset_s(), but until then this has to do. */
823 #pragma GCC pop_options
825 char* string_erase(char *x) {
830 /* A delicious drop of snake-oil! To be called on memory where
831 * we stored passphrases or so, after we used them. */
833 return memory_erase(x, strlen(x));
836 char *string_free_erase(char *s) {
837 return mfree(string_erase(s));
840 bool string_is_safe(const char *p) {
846 for (t = p; *t; t++) {
847 if (*t > 0 && *t < ' ') /* no control characters */
850 if (strchr(QUOTES "\\\x7f", *t))