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_fmt - 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_fmt(const tal_t *ctx, const char *fmt, ...) PRINTF_FMT(2,3);
34 * tal_vfmt - 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_vfmt(const tal_t *ctx, const char *fmt, va_list ap)
43 * tal_append_fmt - append a formatted string to a talloc string.
44 * @baseptr: a pointer to the tal string to be appended to.
45 * @fmt: the printf-style format (can be take()).
47 * Returns false on allocation failure.
49 bool tal_append_fmt(char **baseptr, const char *fmt, ...) PRINTF_FMT(2,3);
52 * tal_append_vfmt - append a formatted string to a talloc string (va_list)
53 * @baseptr: a pointer to the tal string to be appended to.
54 * @fmt: the printf-style format (can be take()).
55 * @va: the va_list containing the format args.
57 * Returns false on allocation failure.
59 bool tal_append_vfmt(char **baseptr, const char *fmt, va_list ap);
62 * tal_strcat - join two strings together
63 * @ctx: NULL, or tal allocated object to be parent.
64 * @s1: the first string (can be take()).
65 * @s2: the second string (can be take()).
67 char *tal_strcat(const tal_t *ctx, const char *s1, const char *s2);
75 * tal_strsplit - Split string into an array of substrings
76 * @ctx: the context to tal from (often NULL).
77 * @string: the string to split (can be take()).
78 * @delims: delimiters where lines should be split (can be take()).
79 * @flags: whether to include empty substrings.
81 * This function splits a single string into multiple strings.
83 * If @string is take(), the returned array will point into the
86 * Multiple delimiters result in empty substrings. By definition, no
87 * delimiters will appear in the substrings.
89 * The final char * in the array will be NULL, and tal_count() will
90 * return the number of elements plus 1 (for that NULL).
93 * #include <ccan/tal/str/str.h>
95 * static unsigned int count_long_lines(const char *string)
98 * unsigned int i, long_lines = 0;
100 * // Can only fail on out-of-memory.
101 * lines = tal_strsplit(NULL, string, "\n", STR_NO_EMPTY);
102 * for (i = 0; lines[i] != NULL; i++)
103 * if (strlen(lines[i]) > 80)
109 char **tal_strsplit(const tal_t *ctx,
110 const char *string, const char *delims, enum strsplit flag);
118 * tal_strjoin - Join an array of substrings into one long string
119 * @ctx: the context to tal from (often NULL).
120 * @strings: the NULL-terminated array of strings to join (can be take())
121 * @delim: the delimiter to insert between the strings (can be take())
122 * @flags: whether to add a delimieter to the end
124 * This function joins an array of strings into a single string. The
125 * return value is allocated using tal. Each string in @strings is
126 * followed by a copy of @delim.
129 * // Append the string "--EOL" to each line.
130 * static char *append_to_all_lines(const char *string)
132 * char **lines, *ret;
134 * lines = tal_strsplit(NULL, string, "\n", STR_EMPTY_OK);
135 * ret = tal_strjoin(NULL, lines, "-- EOL\n", STR_TRAIL);
140 char *tal_strjoin(const void *ctx, char *strings[], const char *delim,
144 * tal_strreg - match/extract from a string via (extended) regular expressions.
145 * @ctx: the context to tal from (often NULL)
146 * @string: the string to try to match (can be take())
147 * @regex: the regular expression to match (can be take())
148 * ...: pointers to strings to allocate for subexpressions.
150 * Returns true if we matched, in which case any parenthesized
151 * expressions in @regex are allocated and placed in the char **
152 * arguments following @regex. NULL arguments mean the match is not
153 * saved. The order of the strings is the order
154 * of opening braces in the expression: in the case of repeated
155 * expressions (eg "([a-z])*") the last one is saved, in the case of
156 * non-existent matches (eg "([a-z]*)?") the pointer is set to NULL.
158 * Allocation failures or malformed regular expressions return false.
161 * regcomp(3), regex(3).
164 * // Given 'My name is Rusty' outputs 'Hello Rusty!'
165 * // Given 'my first name is Rusty Russell' outputs 'Hello Rusty Russell!'
166 * // Given 'My name isnt Rusty Russell' outputs 'Hello there!'
167 * int main(int argc, char *argv[])
169 * char *person, *input;
171 * // Join args and trim trailing space.
172 * input = tal_strjoin(NULL, argv+1, " ", STR_NO_TRAIL);
173 * if (tal_strreg(NULL, input,
174 * "[Mm]y (first )?name is ([A-Za-z ]+)",
176 * printf("Hello %s!\n", person);
178 * printf("Hello there!\n");
182 bool tal_strreg(const void *ctx, const char *string, const char *regex, ...);
183 #endif /* CCAN_STR_TAL_H */