1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28 /**
29 * \file string.h
30 * \brief Strings that know their length.
31 * \author Mike Becker
32 * \author Olaf Wintermann
33 * \copyright 2-Clause BSD License
34 */
35
36 #ifndef UCX_STRING_H
37 #define UCX_STRING_H
38
39 #include "common.h"
40 #include "allocator.h"
41
42 /**
43 * The maximum length of the "needle" in cx_strstr() that can use SBO.
44 */
45 extern unsigned const cx_strstr_sbo_size;
46
47 /**
48 * The UCX string structure.
49 */
50 struct cx_mutstr_s {
51 /**
52 * A pointer to the string.
53 * \note The string is not necessarily \c NULL terminated.
54 * Always use the length.
55 */
56 char *ptr;
57 /** The length of the string */
58 size_t length;
59 };
60
61 /**
62 * A mutable string.
63 */
64 typedef struct cx_mutstr_s cxmutstr;
65
66 /**
67 * The UCX string structure for immutable (constant) strings.
68 */
69 struct cx_string_s {
70 /**
71 * A pointer to the immutable string.
72 * \note The string is not necessarily \c NULL terminated.
73 * Always use the length.
74 */
75 char const *ptr;
76 /** The length of the string */
77 size_t length;
78 };
79
80 /**
81 * An immutable string.
82 */
83 typedef struct cx_string_s cxstring;
84
85 /**
86 * Context for string tokenizing.
87 */
88 struct cx_strtok_ctx_s {
89 /**
90 * The string to tokenize.
91 */
92 cxstring str;
93 /**
94 * The primary delimiter.
95 */
96 cxstring delim;
97 /**
98 * Optional array of more delimiters.
99 */
100 cxstring const *delim_more;
101 /**
102 * Length of the array containing more delimiters.
103 */
104 size_t delim_more_count;
105 /**
106 * Position of the currently active token in the source string.
107 */
108 size_t pos;
109 /**
110 * Position of next delimiter in the source string.
111 *
112 * If the tokenizer has not yet returned a token, the content of this field
113 * is undefined. If the tokenizer reached the end of the string, this field
114 * contains the length of the source string.
115 */
116 size_t delim_pos;
117 /**
118 * The position of the next token in the source string.
119 */
120 size_t next_pos;
121 /**
122 * The number of already found tokens.
123 */
124 size_t found;
125 /**
126 * The maximum number of tokens that shall be returned.
127 */
128 size_t limit;
129 };
130
131 /**
132 * A string tokenizing context.
133 */
134 typedef struct cx_strtok_ctx_s CxStrtokCtx;
135
136 #ifdef __cplusplus
137 extern "C" {
138
139 /**
140 * A literal initializer for an UCX string structure.
141 *
142 * @param literal the string literal
143 */
144 #define CX_STR(literal) cxstring{literal, sizeof(literal) - 1}
145
146 #else // __cplusplus
147
148 /**
149 * A literal initializer for an UCX string structure.
150 *
151 * The argument MUST be a string (const char*) \em literal.
152 *
153 * @param literal the string literal
154 */
155 #define CX_STR(literal) (cxstring){literal, sizeof(literal) - 1}
156
157 #endif
158
159
160 /**
161 * Wraps a mutable string that must be zero-terminated.
162 *
163 * The length is implicitly inferred by using a call to \c strlen().
164 *
165 * \note the wrapped string will share the specified pointer to the string.
166 * If you do want a copy, use cx_strdup() on the return value of this function.
167 *
168 * If you need to wrap a constant string, use cx_str().
169 *
170 * @param cstring the string to wrap, must be zero-terminated
171 * @return the wrapped string
172 *
173 * @see cx_mutstrn()
174 */
175 __attribute__((__warn_unused_result__, __nonnull__))
176 cxmutstr cx_mutstr(char *cstring);
177
178 /**
179 * Wraps a string that does not need to be zero-terminated.
180 *
181 * The argument may be \c NULL if the length is zero.
182 *
183 * \note the wrapped string will share the specified pointer to the string.
184 * If you do want a copy, use cx_strdup() on the return value of this function.
185 *
186 * If you need to wrap a constant string, use cx_strn().
187 *
188 * @param cstring the string to wrap (or \c NULL, only if the length is zero)
189 * @param length the length of the string
190 * @return the wrapped string
191 *
192 * @see cx_mutstr()
193 */
194 __attribute__((__warn_unused_result__))
195 cxmutstr cx_mutstrn(
196 char *cstring,
197 size_t length
198 );
199
200 /**
201 * Wraps a string that must be zero-terminated.
202 *
203 * The length is implicitly inferred by using a call to \c strlen().
204 *
205 * \note the wrapped string will share the specified pointer to the string.
206 * If you do want a copy, use cx_strdup() on the return value of this function.
207 *
208 * If you need to wrap a non-constant string, use cx_mutstr().
209 *
210 * @param cstring the string to wrap, must be zero-terminated
211 * @return the wrapped string
212 *
213 * @see cx_strn()
214 */
215 __attribute__((__warn_unused_result__, __nonnull__))
216 cxstring cx_str(char const *cstring);
217
218
219 /**
220 * Wraps a string that does not need to be zero-terminated.
221 *
222 * The argument may be \c NULL if the length is zero.
223 *
224 * \note the wrapped string will share the specified pointer to the string.
225 * If you do want a copy, use cx_strdup() on the return value of this function.
226 *
227 * If you need to wrap a non-constant string, use cx_mutstrn().
228 *
229 * @param cstring the string to wrap (or \c NULL, only if the length is zero)
230 * @param length the length of the string
231 * @return the wrapped string
232 *
233 * @see cx_str()
234 */
235 __attribute__((__warn_unused_result__))
236 cxstring cx_strn(
237 char const *cstring,
238 size_t length
239 );
240
241 /**
242 * Casts a mutable string to an immutable string.
243 *
244 * \note This is not seriously a cast. Instead you get a copy
245 * of the struct with the desired pointer type. Both structs still
246 * point to the same location, though!
247 *
248 * @param str the mutable string to cast
249 * @return an immutable copy of the string pointer
250 */
251 __attribute__((__warn_unused_result__))
252 cxstring cx_strcast(cxmutstr str);
253
254 /**
255 * Passes the pointer in this string to \c free().
256 *
257 * The pointer in the struct is set to \c NULL and the length is set to zero.
258 *
259 * \note There is no implementation for cxstring, because it is unlikely that
260 * you ever have a \c char \c const* you are really supposed to free. If you
261 * encounter such situation, you should double-check your code.
262 *
263 * @param str the string to free
264 */
265 __attribute__((__nonnull__))
266 void cx_strfree(cxmutstr *str);
267
268 /**
269 * Passes the pointer in this string to the allocators free function.
270 *
271 * The pointer in the struct is set to \c NULL and the length is set to zero.
272 *
273 * \note There is no implementation for cxstring, because it is unlikely that
274 * you ever have a \c char \c const* you are really supposed to free. If you
275 * encounter such situation, you should double-check your code.
276 *
277 * @param alloc the allocator
278 * @param str the string to free
279 */
280 __attribute__((__nonnull__))
281 void cx_strfree_a(
282 CxAllocator const *alloc,
283 cxmutstr *str
284 );
285
286 /**
287 * Returns the accumulated length of all specified strings.
288 *
289 * \attention if the count argument is larger than the number of the
290 * specified strings, the behavior is undefined.
291 *
292 * @param count the total number of specified strings
293 * @param ... all strings
294 * @return the accumulated length of all strings
295 */
296 __attribute__((__warn_unused_result__))
297 size_t cx_strlen(
298 size_t count,
299 ...
300 );
301
302 /**
303 * Concatenates strings.
304 *
305 * The resulting string will be allocated by the specified allocator.
306 * So developers \em must pass the return value to cx_strfree_a() eventually.
307 *
308 * If \p str already contains a string, the memory will be reallocated and
309 * the other strings are appended. Otherwise, new memory is allocated.
310 *
311 * \note It is guaranteed that there is only one allocation.
312 * It is also guaranteed that the returned string is zero-terminated.
313 *
314 * @param alloc the allocator to use
315 * @param str the string the other strings shall be concatenated to
316 * @param count the number of the other following strings to concatenate
317 * @param ... all other strings
318 * @return the concatenated string
319 */
320 __attribute__((__warn_unused_result__, __nonnull__))
321 cxmutstr cx_strcat_ma(
322 CxAllocator const *alloc,
323 cxmutstr str,
324 size_t count,
325 ...
326 );
327
328 /**
329 * Concatenates strings and returns a new string.
330 *
331 * The resulting string will be allocated by the specified allocator.
332 * So developers \em must pass the return value to cx_strfree_a() eventually.
333 *
334 * \note It is guaranteed that there is only one allocation.
335 * It is also guaranteed that the returned string is zero-terminated.
336 *
337 * @param alloc the allocator to use
338 * @param count the number of the other following strings to concatenate
339 * @param ... all other strings
340 * @return the concatenated string
341 */
342 #define cx_strcat_a(alloc, count, ...) \
343 cx_strcat_ma(alloc, cx_mutstrn(NULL, 0), count, __VA_ARGS__)
344
345 /**
346 * Concatenates strings and returns a new string.
347 *
348 * The resulting string will be allocated by standard \c malloc().
349 * So developers \em must pass the return value to cx_strfree() eventually.
350 *
351 * \note It is guaranteed that there is only one allocation.
352 * It is also guaranteed that the returned string is zero-terminated.
353 *
354 * @param count the number of the other following strings to concatenate
355 * @param ... all other strings
356 * @return the concatenated string
357 */
358 #define cx_strcat(count, ...) \
359 cx_strcat_ma(cxDefaultAllocator, cx_mutstrn(NULL, 0), count, __VA_ARGS__)
360
361 /**
362 * Concatenates strings.
363 *
364 * The resulting string will be allocated by standard \c malloc().
365 * So developers \em must pass the return value to cx_strfree() eventually.
366 *
367 * If \p str already contains a string, the memory will be reallocated and
368 * the other strings are appended. Otherwise, new memory is allocated.
369 *
370 * \note It is guaranteed that there is only one allocation.
371 * It is also guaranteed that the returned string is zero-terminated.
372 *
373 * @param str the string the other strings shall be concatenated to
374 * @param count the number of the other following strings to concatenate
375 * @param ... all other strings
376 * @return the concatenated string
377 */
378 #define cx_strcat_m(str, count, ...) \
379 cx_strcat_ma(cxDefaultAllocator, str, count, __VA_ARGS__)
380
381 /**
382 * Returns a substring starting at the specified location.
383 *
384 * \attention the new string references the same memory area as the
385 * input string and is usually \em not zero-terminated.
386 * Use cx_strdup() to get a copy.
387 *
388 * @param string input string
389 * @param start start location of the substring
390 * @return a substring of \p string starting at \p start
391 *
392 * @see cx_strsubsl()
393 * @see cx_strsubs_m()
394 * @see cx_strsubsl_m()
395 */
396 __attribute__((__warn_unused_result__))
397 cxstring cx_strsubs(
398 cxstring string,
399 size_t start
400 );
401
402 /**
403 * Returns a substring starting at the specified location.
404 *
405 * The returned string will be limited to \p length bytes or the number
406 * of bytes available in \p string, whichever is smaller.
407 *
408 * \attention the new string references the same memory area as the
409 * input string and is usually \em not zero-terminated.
410 * Use cx_strdup() to get a copy.
411 *
412 * @param string input string
413 * @param start start location of the substring
414 * @param length the maximum length of the returned string
415 * @return a substring of \p string starting at \p start
416 *
417 * @see cx_strsubs()
418 * @see cx_strsubs_m()
419 * @see cx_strsubsl_m()
420 */
421 __attribute__((__warn_unused_result__))
422 cxstring cx_strsubsl(
423 cxstring string,
424 size_t start,
425 size_t length
426 );
427
428 /**
429 * Returns a substring starting at the specified location.
430 *
431 * \attention the new string references the same memory area as the
432 * input string and is usually \em not zero-terminated.
433 * Use cx_strdup() to get a copy.
434 *
435 * @param string input string
436 * @param start start location of the substring
437 * @return a substring of \p string starting at \p start
438 *
439 * @see cx_strsubsl_m()
440 * @see cx_strsubs()
441 * @see cx_strsubsl()
442 */
443 __attribute__((__warn_unused_result__))
444 cxmutstr cx_strsubs_m(
445 cxmutstr string,
446 size_t start
447 );
448
449 /**
450 * Returns a substring starting at the specified location.
451 *
452 * The returned string will be limited to \p length bytes or the number
453 * of bytes available in \p string, whichever is smaller.
454 *
455 * \attention the new string references the same memory area as the
456 * input string and is usually \em not zero-terminated.
457 * Use cx_strdup() to get a copy.
458 *
459 * @param string input string
460 * @param start start location of the substring
461 * @param length the maximum length of the returned string
462 * @return a substring of \p string starting at \p start
463 *
464 * @see cx_strsubs_m()
465 * @see cx_strsubs()
466 * @see cx_strsubsl()
467 */
468 __attribute__((__warn_unused_result__))
469 cxmutstr cx_strsubsl_m(
470 cxmutstr string,
471 size_t start,
472 size_t length
473 );
474
475 /**
476 * Returns a substring starting at the location of the first occurrence of the
477 * specified character.
478 *
479 * If the string does not contain the character, an empty string is returned.
480 *
481 * @param string the string where to locate the character
482 * @param chr the character to locate
483 * @return a substring starting at the first location of \p chr
484 *
485 * @see cx_strchr_m()
486 */
487 __attribute__((__warn_unused_result__))
488 cxstring cx_strchr(
489 cxstring string,
490 int chr
491 );
492
493 /**
494 * Returns a substring starting at the location of the first occurrence of the
495 * specified character.
496 *
497 * If the string does not contain the character, an empty string is returned.
498 *
499 * @param string the string where to locate the character
500 * @param chr the character to locate
501 * @return a substring starting at the first location of \p chr
502 *
503 * @see cx_strchr()
504 */
505 __attribute__((__warn_unused_result__))
506 cxmutstr cx_strchr_m(
507 cxmutstr string,
508 int chr
509 );
510
511 /**
512 * Returns a substring starting at the location of the last occurrence of the
513 * specified character.
514 *
515 * If the string does not contain the character, an empty string is returned.
516 *
517 * @param string the string where to locate the character
518 * @param chr the character to locate
519 * @return a substring starting at the last location of \p chr
520 *
521 * @see cx_strrchr_m()
522 */
523 __attribute__((__warn_unused_result__))
524 cxstring cx_strrchr(
525 cxstring string,
526 int chr
527 );
528
529 /**
530 * Returns a substring starting at the location of the last occurrence of the
531 * specified character.
532 *
533 * If the string does not contain the character, an empty string is returned.
534 *
535 * @param string the string where to locate the character
536 * @param chr the character to locate
537 * @return a substring starting at the last location of \p chr
538 *
539 * @see cx_strrchr()
540 */
541 __attribute__((__warn_unused_result__))
542 cxmutstr cx_strrchr_m(
543 cxmutstr string,
544 int chr
545 );
546
547 /**
548 * Returns a substring starting at the location of the first occurrence of the
549 * specified string.
550 *
551 * If \p haystack does not contain \p needle, an empty string is returned.
552 *
553 * If \p needle is an empty string, the complete \p haystack is
554 * returned.
555 *
556 * @param haystack the string to be scanned
557 * @param needle string containing the sequence of characters to match
558 * @return a substring starting at the first occurrence of
559 * \p needle, or an empty string, if the sequence is not
560 * contained
561 * @see cx_strstr_m()
562 */
563 __attribute__((__warn_unused_result__))
564 cxstring cx_strstr(
565 cxstring haystack,
566 cxstring needle
567 );
568
569 /**
570 * Returns a substring starting at the location of the first occurrence of the
571 * specified string.
572 *
573 * If \p haystack does not contain \p needle, an empty string is returned.
574 *
575 * If \p needle is an empty string, the complete \p haystack is
576 * returned.
577 *
578 * @param haystack the string to be scanned
579 * @param needle string containing the sequence of characters to match
580 * @return a substring starting at the first occurrence of
581 * \p needle, or an empty string, if the sequence is not
582 * contained
583 * @see cx_strstr()
584 */
585 __attribute__((__warn_unused_result__))
586 cxmutstr cx_strstr_m(
587 cxmutstr haystack,
588 cxstring needle
589 );
590
591 /**
592 * Splits a given string using a delimiter string.
593 *
594 * \note The resulting array contains strings that point to the source
595 * \p string. Use cx_strdup() to get copies.
596 *
597 * @param string the string to split
598 * @param delim the delimiter
599 * @param limit the maximum number of split items
600 * @param output a pre-allocated array of at least \p limit length
601 * @return the actual number of split items
602 */
603 __attribute__((__warn_unused_result__, __nonnull__))
604 size_t cx_strsplit(
605 cxstring string,
606 cxstring delim,
607 size_t limit,
608 cxstring *output
609 );
610
611 /**
612 * Splits a given string using a delimiter string.
613 *
614 * The array pointed to by \p output will be allocated by \p allocator.
615 *
616 * \note The resulting array contains strings that point to the source
617 * \p string. Use cx_strdup() to get copies.
618 *
619 * \attention If allocation fails, the \c NULL pointer will be written to
620 * \p output and the number returned will be zero.
621 *
622 * @param allocator the allocator to use for allocating the resulting array
623 * @param string the string to split
624 * @param delim the delimiter
625 * @param limit the maximum number of split items
626 * @param output a pointer where the address of the allocated array shall be
627 * written to
628 * @return the actual number of split items
629 */
630 __attribute__((__warn_unused_result__, __nonnull__))
631 size_t cx_strsplit_a(
632 CxAllocator const *allocator,
633 cxstring string,
634 cxstring delim,
635 size_t limit,
636 cxstring **output
637 );
638
639
640 /**
641 * Splits a given string using a delimiter string.
642 *
643 * \note The resulting array contains strings that point to the source
644 * \p string. Use cx_strdup() to get copies.
645 *
646 * @param string the string to split
647 * @param delim the delimiter
648 * @param limit the maximum number of split items
649 * @param output a pre-allocated array of at least \p limit length
650 * @return the actual number of split items
651 */
652 __attribute__((__warn_unused_result__, __nonnull__))
653 size_t cx_strsplit_m(
654 cxmutstr string,
655 cxstring delim,
656 size_t limit,
657 cxmutstr *output
658 );
659
660 /**
661 * Splits a given string using a delimiter string.
662 *
663 * The array pointed to by \p output will be allocated by \p allocator.
664 *
665 * \note The resulting array contains strings that point to the source
666 * \p string. Use cx_strdup() to get copies.
667 *
668 * \attention If allocation fails, the \c NULL pointer will be written to
669 * \p output and the number returned will be zero.
670 *
671 * @param allocator the allocator to use for allocating the resulting array
672 * @param string the string to split
673 * @param delim the delimiter
674 * @param limit the maximum number of split items
675 * @param output a pointer where the address of the allocated array shall be
676 * written to
677 * @return the actual number of split items
678 */
679 __attribute__((__warn_unused_result__, __nonnull__))
680 size_t cx_strsplit_ma(
681 CxAllocator const *allocator,
682 cxmutstr string,
683 cxstring delim,
684 size_t limit,
685 cxmutstr **output
686 );
687
688 /**
689 * Compares two strings.
690 *
691 * @param s1 the first string
692 * @param s2 the second string
693 * @return negative if \p s1 is smaller than \p s2, positive if \p s1 is larger
694 * than \p s2, zero if both strings equal
695 */
696 __attribute__((__warn_unused_result__))
697 int cx_strcmp(
698 cxstring s1,
699 cxstring s2
700 );
701
702 /**
703 * Compares two strings ignoring case.
704 *
705 * @param s1 the first string
706 * @param s2 the second string
707 * @return negative if \p s1 is smaller than \p s2, positive if \p s1 is larger
708 * than \p s2, zero if both strings equal ignoring case
709 */
710 __attribute__((__warn_unused_result__))
711 int cx_strcasecmp(
712 cxstring s1,
713 cxstring s2
714 );
715
716 /**
717 * Compares two strings.
718 *
719 * This function has a compatible signature for the use as a cx_compare_func.
720 *
721 * @param s1 the first string
722 * @param s2 the second string
723 * @return negative if \p s1 is smaller than \p s2, positive if \p s1 is larger
724 * than \p s2, zero if both strings equal
725 */
726 __attribute__((__warn_unused_result__, __nonnull__))
727 int cx_strcmp_p(
728 void const *s1,
729 void const *s2
730 );
731
732 /**
733 * Compares two strings ignoring case.
734 *
735 * This function has a compatible signature for the use as a cx_compare_func.
736 *
737 * @param s1 the first string
738 * @param s2 the second string
739 * @return negative if \p s1 is smaller than \p s2, positive if \p s1 is larger
740 * than \p s2, zero if both strings equal ignoring case
741 */
742 __attribute__((__warn_unused_result__, __nonnull__))
743 int cx_strcasecmp_p(
744 void const *s1,
745 void const *s2
746 );
747
748
749 /**
750 * Creates a duplicate of the specified string.
751 *
752 * The new string will contain a copy allocated by \p allocator.
753 *
754 * \note The returned string is guaranteed to be zero-terminated.
755 *
756 * @param allocator the allocator to use
757 * @param string the string to duplicate
758 * @return a duplicate of the string
759 * @see cx_strdup()
760 */
761 __attribute__((__warn_unused_result__, __nonnull__))
762 cxmutstr cx_strdup_a(
763 CxAllocator const *allocator,
764 cxstring string
765 );
766
767 /**
768 * Creates a duplicate of the specified string.
769 *
770 * The new string will contain a copy allocated by standard
771 * \c malloc(). So developers \em must pass the return value to cx_strfree().
772 *
773 * \note The returned string is guaranteed to be zero-terminated.
774 *
775 * @param string the string to duplicate
776 * @return a duplicate of the string
777 * @see cx_strdup_a()
778 */
779 #define cx_strdup(string) cx_strdup_a(cxDefaultAllocator, string)
780
781
782 /**
783 * Creates a duplicate of the specified string.
784 *
785 * The new string will contain a copy allocated by \p allocator.
786 *
787 * \note The returned string is guaranteed to be zero-terminated.
788 *
789 * @param allocator the allocator to use
790 * @param string the string to duplicate
791 * @return a duplicate of the string
792 * @see cx_strdup_m()
793 */
794 #define cx_strdup_ma(allocator, string) cx_strdup_a(allocator, cx_strcast(string))
795
796 /**
797 * Creates a duplicate of the specified string.
798 *
799 * The new string will contain a copy allocated by standard
800 * \c malloc(). So developers \em must pass the return value to cx_strfree().
801 *
802 * \note The returned string is guaranteed to be zero-terminated.
803 *
804 * @param string the string to duplicate
805 * @return a duplicate of the string
806 * @see cx_strdup_ma()
807 */
808 #define cx_strdup_m(string) cx_strdup_a(cxDefaultAllocator, cx_strcast(string))
809
810 /**
811 * Omits leading and trailing spaces.
812 *
813 * \note the returned string references the same memory, thus you
814 * must \em not free the returned memory.
815 *
816 * @param string the string that shall be trimmed
817 * @return the trimmed string
818 */
819 __attribute__((__warn_unused_result__))
820 cxstring cx_strtrim(cxstring string);
821
822 /**
823 * Omits leading and trailing spaces.
824 *
825 * \note the returned string references the same memory, thus you
826 * must \em not free the returned memory.
827 *
828 * @param string the string that shall be trimmed
829 * @return the trimmed string
830 */
831 __attribute__((__warn_unused_result__))
832 cxmutstr cx_strtrim_m(cxmutstr string);
833
834 /**
835 * Checks, if a string has a specific prefix.
836 *
837 * @param string the string to check
838 * @param prefix the prefix the string should have
839 * @return \c true, if and only if the string has the specified prefix,
840 * \c false otherwise
841 */
842 __attribute__((__warn_unused_result__))
843 bool cx_strprefix(
844 cxstring string,
845 cxstring prefix
846 );
847
848 /**
849 * Checks, if a string has a specific suffix.
850 *
851 * @param string the string to check
852 * @param suffix the suffix the string should have
853 * @return \c true, if and only if the string has the specified suffix,
854 * \c false otherwise
855 */
856 __attribute__((__warn_unused_result__))
857 bool cx_strsuffix(
858 cxstring string,
859 cxstring suffix
860 );
861
862 /**
863 * Checks, if a string has a specific prefix, ignoring the case.
864 *
865 * @param string the string to check
866 * @param prefix the prefix the string should have
867 * @return \c true, if and only if the string has the specified prefix,
868 * \c false otherwise
869 */
870 __attribute__((__warn_unused_result__))
871 bool cx_strcaseprefix(
872 cxstring string,
873 cxstring prefix
874 );
875
876 /**
877 * Checks, if a string has a specific suffix, ignoring the case.
878 *
879 * @param string the string to check
880 * @param suffix the suffix the string should have
881 * @return \c true, if and only if the string has the specified suffix,
882 * \c false otherwise
883 */
884 __attribute__((__warn_unused_result__))
885 bool cx_strcasesuffix(
886 cxstring string,
887 cxstring suffix
888 );
889
890 /**
891 * Converts the string to lower case.
892 *
893 * The change is made in-place. If you want a copy, use cx_strdup(), first.
894 *
895 * @param string the string to modify
896 * @see cx_strdup()
897 */
898 void cx_strlower(cxmutstr string);
899
900 /**
901 * Converts the string to upper case.
902 *
903 * The change is made in-place. If you want a copy, use cx_strdup(), first.
904 *
905 * @param string the string to modify
906 * @see cx_strdup()
907 */
908 void cx_strupper(cxmutstr string);
909
910 /**
911 * Replaces a pattern in a string with another string.
912 *
913 * The pattern is taken literally and is no regular expression.
914 * Replaces at most \p replmax occurrences.
915 *
916 * The returned string will be allocated by \p allocator and is guaranteed
917 * to be zero-terminated.
918 *
919 * If allocation fails, or the input string is empty,
920 * the returned string will be empty.
921 *
922 * @param allocator the allocator to use
923 * @param str the string where replacements should be applied
924 * @param pattern the pattern to search for
925 * @param replacement the replacement string
926 * @param replmax maximum number of replacements
927 * @return the resulting string after applying the replacements
928 */
929 __attribute__((__warn_unused_result__, __nonnull__))
930 cxmutstr cx_strreplacen_a(
931 CxAllocator const *allocator,
932 cxstring str,
933 cxstring pattern,
934 cxstring replacement,
935 size_t replmax
936 );
937
938 /**
939 * Replaces a pattern in a string with another string.
940 *
941 * The pattern is taken literally and is no regular expression.
942 * Replaces at most \p replmax occurrences.
943 *
944 * The returned string will be allocated by \c malloc() and is guaranteed
945 * to be zero-terminated.
946 *
947 * If allocation fails, or the input string is empty,
948 * the returned string will be empty.
949 *
950 * @param str the string where replacements should be applied
951 * @param pattern the pattern to search for
952 * @param replacement the replacement string
953 * @param replmax maximum number of replacements
954 * @return the resulting string after applying the replacements
955 */
956 #define cx_strreplacen(str, pattern, replacement, replmax) \
957 cx_strreplacen_a(cxDefaultAllocator, str, pattern, replacement, replmax)
958
959 /**
960 * Replaces a pattern in a string with another string.
961 *
962 * The pattern is taken literally and is no regular expression.
963 *
964 * The returned string will be allocated by \p allocator and is guaranteed
965 * to be zero-terminated.
966 *
967 * If allocation fails, or the input string is empty,
968 * the returned string will be empty.
969 *
970 * @param allocator the allocator to use
971 * @param str the string where replacements should be applied
972 * @param pattern the pattern to search for
973 * @param replacement the replacement string
974 * @return the resulting string after applying the replacements
975 */
976 #define cx_strreplace_a(allocator, str, pattern, replacement) \
977 cx_strreplacen_a(allocator, str, pattern, replacement, SIZE_MAX)
978
979 /**
980 * Replaces a pattern in a string with another string.
981 *
982 * The pattern is taken literally and is no regular expression.
983 * Replaces at most \p replmax occurrences.
984 *
985 * The returned string will be allocated by \c malloc() and is guaranteed
986 * to be zero-terminated.
987 *
988 * If allocation fails, or the input string is empty,
989 * the returned string will be empty.
990 *
991 * @param str the string where replacements should be applied
992 * @param pattern the pattern to search for
993 * @param replacement the replacement string
994 * @return the resulting string after applying the replacements
995 */
996 #define cx_strreplace(str, pattern, replacement) \
997 cx_strreplacen_a(cxDefaultAllocator, str, pattern, replacement, SIZE_MAX)
998
999 /**
1000 * Creates a string tokenization context.
1001 *
1002 * @param str the string to tokenize
1003 * @param delim the delimiter (must not be empty)
1004 * @param limit the maximum number of tokens that shall be returned
1005 * @return a new string tokenization context
1006 */
1007 __attribute__((__warn_unused_result__))
1008 CxStrtokCtx cx_strtok(
1009 cxstring str,
1010 cxstring delim,
1011 size_t limit
1012 );
1013
1014 /**
1015 * Creates a string tokenization context for a mutable string.
1016 *
1017 * @param str the string to tokenize
1018 * @param delim the delimiter (must not be empty)
1019 * @param limit the maximum number of tokens that shall be returned
1020 * @return a new string tokenization context
1021 */
1022 __attribute__((__warn_unused_result__))
1023 CxStrtokCtx cx_strtok_m(
1024 cxmutstr str,
1025 cxstring delim,
1026 size_t limit
1027 );
1028
1029 /**
1030 * Returns the next token.
1031 *
1032 * The token will point to the source string.
1033 *
1034 * @param ctx the tokenization context
1035 * @param token a pointer to memory where the next token shall be stored
1036 * @return true if successful, false if the limit or the end of the string
1037 * has been reached
1038 */
1039 __attribute__((__warn_unused_result__, __nonnull__))
1040 bool cx_strtok_next(
1041 CxStrtokCtx *ctx,
1042 cxstring *token
1043 );
1044
1045 /**
1046 * Returns the next token of a mutable string.
1047 *
1048 * The token will point to the source string.
1049 * If the context was not initialized over a mutable string, modifying
1050 * the data of the returned token is undefined behavior.
1051 *
1052 * @param ctx the tokenization context
1053 * @param token a pointer to memory where the next token shall be stored
1054 * @return true if successful, false if the limit or the end of the string
1055 * has been reached
1056 */
1057 __attribute__((__warn_unused_result__, __nonnull__))
1058 bool cx_strtok_next_m(
1059 CxStrtokCtx *ctx,
1060 cxmutstr *token
1061 );
1062
1063 /**
1064 * Defines an array of more delimiters for the specified tokenization context.
1065 *
1066 * @param ctx the tokenization context
1067 * @param delim array of more delimiters
1068 * @param count number of elements in the array
1069 */
1070 __attribute__((__nonnull__))
1071 void cx_strtok_delim(
1072 CxStrtokCtx *ctx,
1073 cxstring const *delim,
1074 size_t count
1075 );
1076
1077
1078 #ifdef __cplusplus
1079 } // extern "C"
1080 #endif
1081
1082 #endif //UCX_STRING_H
1083