1 files changed, 192 insertions, 0 deletions
diff --git a/ccan/tal/str/str.h b/ccan/tal/str/str.h
new file mode 100644
index 0000000..ec853de
--- /dev/null
+++ b/ccan/tal/str/str.h
@@ -0,0 +1,192 @@
+/* Licensed under BSD-MIT - see LICENSE file for details */
+#ifndef CCAN_STR_TAL_H
+#define CCAN_STR_TAL_H
+#ifdef TAL_USE_TALLOC
+#include <ccan/tal/talloc/talloc.h>
+#else
+#include <ccan/tal/tal.h>
+#endif
+#include <string.h>
+#include <stdbool.h>
+
+/**
+ * tal_strdup - duplicate a string
+ * @ctx: NULL, or tal allocated object to be parent.
+ * @p: the string to copy (can be take()).
+ */
+char *tal_strdup(const tal_t *ctx, const char *p TAKES);
+
+/**
+ * tal_strndup - duplicate a limited amount of a string.
+ * @ctx: NULL, or tal allocated object to be parent.
+ * @p: the string to copy (can be take()).
+ * @n: the maximum length to copy.
+ *
+ * Always gives a nul-terminated string, with strlen() <= @n.
+ */
+char *tal_strndup(const tal_t *ctx, const char *p TAKES, size_t n);
+
+/**
+ * tal_fmt - allocate a formatted string
+ * @ctx: NULL, or tal allocated object to be parent.
+ * @fmt: the printf-style format (can be take()).
+ */
+char *tal_fmt(const tal_t *ctx, const char *fmt TAKES, ...) PRINTF_FMT(2,3);
+
+/**
+ * tal_vfmt - allocate a formatted string (va_list version)
+ * @ctx: NULL, or tal allocated object to be parent.
+ * @fmt: the printf-style format (can be take()).
+ * @va: the va_list containing the format args.
+ */
+char *tal_vfmt(const tal_t *ctx, const char *fmt TAKES, va_list ap)
+	PRINTF_FMT(2,0);
+
+/**
+ * tal_append_fmt - append a formatted string to a talloc string.
+ * @baseptr: a pointer to the tal string to be appended to.
+ * @fmt: the printf-style format (can be take()).
+ *
+ * Returns false on allocation failure.
+ */
+bool tal_append_fmt(char **baseptr, const char *fmt TAKES, ...) PRINTF_FMT(2,3);
+
+/**
+ * tal_append_vfmt - append a formatted string to a talloc string (va_list)
+ * @baseptr: a pointer to the tal string to be appended to.
+ * @fmt: the printf-style format (can be take()).
+ * @va: the va_list containing the format args.
+ *
+ * Returns false on allocation failure.
+ */
+bool tal_append_vfmt(char **baseptr, const char *fmt TAKES, va_list ap);
+
+/**
+ * tal_strcat - join two strings together
+ * @ctx: NULL, or tal allocated object to be parent.
+ * @s1: the first string (can be take()).
+ * @s2: the second string (can be take()).
+ */
+char *tal_strcat(const tal_t *ctx, const char *s1 TAKES, const char *s2 TAKES);
+
+enum strsplit {
+	STR_EMPTY_OK,
+	STR_NO_EMPTY
+};
+
+/**
+ * tal_strsplit - Split string into an array of substrings
+ * @ctx: the context to tal from (often NULL).
+ * @string: the string to split (can be take()).
+ * @delims: delimiters where lines should be split (can be take()).
+ * @flags: whether to include empty substrings.
+ *
+ * This function splits a single string into multiple strings.
+ *
+ * If @string is take(), the returned array will point into the
+ * mangled @string.
+ *
+ * Multiple delimiters result in empty substrings.  By definition, no
+ * delimiters will appear in the substrings.
+ *
+ * The final char * in the array will be NULL, and tal_count() will
+ * return the number of elements plus 1 (for that NULL).
+ *
+ * Example:
+ *	#include <ccan/tal/str/str.h>
+ *	...
+ *	static unsigned int count_long_lines(const char *string)
+ *	{
+ *		char **lines;
+ *		unsigned int i, long_lines = 0;
+ *
+ *		// Can only fail on out-of-memory.
+ *		lines = tal_strsplit(NULL, string, "\n", STR_NO_EMPTY);
+ *		for (i = 0; lines[i] != NULL; i++)
+ *			if (strlen(lines[i]) > 80)
+ *				long_lines++;
+ *		tal_free(lines);
+ *		return long_lines;
+ *	}
+ */
+char **tal_strsplit(const tal_t *ctx,
+		    const char *string TAKES,
+		    const char *delims TAKES,
+		    enum strsplit flag);
+
+enum strjoin {
+	STR_TRAIL,
+	STR_NO_TRAIL
+};
+
+/**
+ * tal_strjoin - Join an array of substrings into one long string
+ * @ctx: the context to tal from (often NULL).
+ * @strings: the NULL-terminated array of strings to join (can be take())
+ * @delim: the delimiter to insert between the strings (can be take())
+ * @flags: whether to add a delimieter to the end
+ *
+ * This function joins an array of strings into a single string.  The
+ * return value is allocated using tal.  Each string in @strings is
+ * followed by a copy of @delim.
+ *
+ * Example:
+ *	// Append the string "--EOL" to each line.
+ *	static char *append_to_all_lines(const char *string)
+ *	{
+ *		char **lines, *ret;
+ *
+ *		lines = tal_strsplit(NULL, string, "\n", STR_EMPTY_OK);
+ *		ret = tal_strjoin(NULL, lines, "-- EOL\n", STR_TRAIL);
+ *		tal_free(lines);
+ *		return ret;
+ *	}
+ */
+char *tal_strjoin(const void *ctx,
+		  char *strings[] TAKES,
+		  const char *delim TAKES,
+		  enum strjoin flags);
+
+/**
+ * tal_strreg - match/extract from a string via (extended) regular expressions.
+ * @ctx: the context to tal from (often NULL)
+ * @string: the string to try to match (can be take())
+ * @regex: the regular expression to match (can be take())
+ * ...: pointers to strings to allocate for subexpressions.
+ *
+ * Returns true if we matched, in which case any parenthesized
+ * expressions in @regex are allocated and placed in the char **
+ * arguments following @regex.  NULL arguments mean the match is not
+ * saved.  The order of the strings is the order
+ * of opening braces in the expression: in the case of repeated
+ * expressions (eg "([a-z])*") the last one is saved, in the case of
+ * non-existent matches (eg "([a-z]*)?") the pointer is set to NULL.
+ *
+ * Allocation failures or malformed regular expressions return false.
+ *
+ * See Also:
+ *	regcomp(3), regex(3).
+ *
+ * Example:
+ *	// Given "My name is Rusty" outputs "Hello Rusty!\n"
+ *	// Given "my first name is Rusty Russell" outputs "Hello Rusty Russell!\n"
+ *	// Given "My name isnt Rusty Russell" outputs "Hello there!\n"
+ *	int main(int argc, char *argv[])
+ *	{
+ *		char *person, *input;
+ *
+ *		(void)argc;
+ *		// Join args and trim trailing space.
+ *		input = tal_strjoin(NULL, argv+1, " ", STR_NO_TRAIL);
+ *		if (tal_strreg(NULL, input,
+ *			       "[Mm]y (first )?name is ([A-Za-z ]+)",
+ *			       NULL, &person))
+ *			printf("Hello %s!\n", person);
+ *		else
+ *			printf("Hello there!\n");
+ *		return 0;
+ *	}
+ */
+bool tal_strreg(const void *ctx, const char *string TAKES,
+		const char *regex TAKES, ...);
+#endif /* CCAN_STR_TAL_H */