1 /* Licensed under BSD-MIT - see LICENSE file for details */
4 #include <ccan/tal/tal.h>
5 #include <ccan/tal/tal.h>
10 * tal_strdup - duplicate a string
11 * @ctx: NULL, or tal allocated object to be parent.
12 * @p: the string to copy (can be take()).
14 char *tal_strdup(const tal_t *ctx, const char *p);
17 * tal_strndup - duplicate a limited amount of a string.
18 * @ctx: NULL, or tal allocated object to be parent.
19 * @p: the string to copy (can be take()).
20 * @n: the maximum length to copy.
22 * Always gives a nul-terminated string, with strlen() <= @n.
24 char *tal_strndup(const tal_t *ctx, const char *p, size_t n);
27 * tal_asprintf - allocate a formatted string
28 * @ctx: NULL, or tal allocated object to be parent.
29 * @fmt: the printf-style format (can be take()).
31 char *tal_asprintf(const tal_t *ctx, const char *fmt, ...) PRINTF_FMT(2,3);
34 * tal_vasprintf - allocate a formatted string (va_list version)
35 * @ctx: NULL, or tal allocated object to be parent.
36 * @fmt: the printf-style format (can be take()).
37 * @va: the va_list containing the format args.
39 char *tal_vasprintf(const tal_t *ctx, const char *fmt, va_list ap)
48 * tal_strsplit - Split string into an array of substrings
49 * @ctx: the context to tal from (often NULL).
50 * @string: the string to split (can be take()).
51 * @delims: delimiters where lines should be split (can be take()).
52 * @flags: whether to include empty substrings.
54 * This function splits a single string into multiple strings.
56 * If @string is take(), the returned array will point into the
59 * Multiple delimiters result in empty substrings. By definition, no
60 * delimiters will appear in the substrings.
62 * The final char * in the array will be NULL, and tal_count() will
63 * return the number of elements plus 1 (for that NULL).
66 * #include <ccan/tal/str/str.h>
68 * static unsigned int count_long_lines(const char *string)
71 * unsigned int i, long_lines = 0;
73 * // Can only fail on out-of-memory.
74 * lines = tal_strsplit(NULL, string, "\n", STR_NO_EMPTY);
75 * for (i = 0; lines[i] != NULL; i++)
76 * if (strlen(lines[i]) > 80)
82 char **tal_strsplit(const tal_t *ctx,
83 const char *string, const char *delims, enum strsplit flag);
91 * tal_strjoin - Join an array of substrings into one long string
92 * @ctx: the context to tal from (often NULL).
93 * @strings: the NULL-terminated array of strings to join (can be take())
94 * @delim: the delimiter to insert between the strings (can be take())
95 * @flags: whether to add a delimieter to the end
97 * This function joins an array of strings into a single string. The
98 * return value is allocated using tal. Each string in @strings is
99 * followed by a copy of @delim.
102 * // Append the string "--EOL" to each line.
103 * static char *append_to_all_lines(const char *string)
105 * char **lines, *ret;
107 * lines = tal_strsplit(NULL, string, "\n", STR_EMPTY_OK);
108 * ret = tal_strjoin(NULL, lines, "-- EOL\n", STR_TRAIL);
113 char *tal_strjoin(const void *ctx, char *strings[], const char *delim,
117 * tal_strreg - match/extract from a string via (extended) regular expressions.
118 * @ctx: the context to tal from (often NULL)
119 * @string: the string to try to match (can be take())
120 * @regex: the regular expression to match (can be take())
121 * ...: pointers to strings to allocate for subexpressions.
123 * Returns true if we matched, in which case any parenthesized
124 * expressions in @regex are allocated and placed in the char **
125 * arguments following @regex. NULL arguments mean the match is not
126 * saved. The order of the strings is the order
127 * of opening braces in the expression: in the case of repeated
128 * expressions (eg "([a-z])*") the last one is saved, in the case of
129 * non-existent matches (eg "([a-z]*)?") the pointer is set to NULL.
131 * Allocation failures or malformed regular expressions return false.
134 * regcomp(3), regex(3).
137 * // Given 'My name is Rusty' outputs 'Hello Rusty!'
138 * // Given 'my first name is Rusty Russell' outputs 'Hello Rusty Russell!'
139 * // Given 'My name isnt Rusty Russell' outputs 'Hello there!'
140 * int main(int argc, char *argv[])
142 * char *person, *input;
144 * // Join args and trim trailing space.
145 * input = tal_strjoin(NULL, argv+1, " ", STR_NO_TRAIL);
146 * if (tal_strreg(NULL, input,
147 * "[Mm]y (first )?name is ([A-Za-z ]+)",
149 * printf("Hello %s!\n", person);
151 * printf("Hello there!\n");
155 bool tal_strreg(const void *ctx, const char *string, const char *regex, ...);
156 #endif /* CCAN_STR_TAL_H */