#include <limits.h>
#include <stdlib.h>
#include "str_talloc.h"
+#include <sys/types.h>
+#include <regex.h>
+#include <stdarg.h>
+#include <unistd.h>
#include <ccan/talloc/talloc.h>
+#include <ccan/str/str.h>
char **strsplit(const void *ctx, const char *string, const char *delims,
unsigned int *nump)
}
return ret;
}
+
+bool strreg(const void *ctx, const char *string, const char *regex, ...)
+{
+ size_t nmatch = 1 + strcount(regex, "(");
+ regmatch_t *matches = talloc_array(ctx, regmatch_t, nmatch);
+ regex_t r;
+ bool ret;
+
+ if (!matches || regcomp(&r, regex, REG_EXTENDED) != 0)
+ return false;
+
+ if (regexec(&r, string, nmatch, matches, 0) == 0) {
+ unsigned int i;
+ va_list ap;
+
+ ret = true;
+ va_start(ap, regex);
+ for (i = 1; i < nmatch; i++) {
+ char **arg;
+ arg = va_arg(ap, char **);
+ if (arg) {
+ /* eg. ([a-z])? can give "no match". */
+ if (matches[i].rm_so == -1)
+ *arg = NULL;
+ else {
+ *arg = talloc_strndup(ctx,
+ string + matches[i].rm_so,
+ matches[i].rm_eo
+ - matches[i].rm_so);
+ if (!*arg) {
+ ret = false;
+ break;
+ }
+ }
+ }
+ }
+ va_end(ap);
+ } else
+ ret = false;
+ talloc_free(matches);
+ regfree(&r);
+ return ret;
+}
* }
*/
char *strjoin(const void *ctx, char *strings[], const char *delim);
+
+/**
+ * strreg - match and extract from a string via (extended) regular expressions.
+ * @ctx: the context to tallocate from (often NULL)
+ * @string: the string to try to match.
+ * @regex: the regular expression to match.
+ * ...: 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!'
+ * // Given 'my first name is Rusty Russell' outputs 'Hello Rusty Russell!'
+ * // Given 'My name isnt Rusty Russell' outputs 'Hello there!'
+ * int main(int argc, char *argv[])
+ * {
+ * char *person, *input;
+ *
+ * // Join args and trim trailing space.
+ * input = strjoin(NULL, argv+1, " ");
+ * if (strlen(input) != 0)
+ * input[strlen(input)-1] = '\0';
+ *
+ * if (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 strreg(const void *ctx, const char *string, const char *regex, ...);
#endif /* CCAN_STR_TALLOC_H */
--- /dev/null
+#include <ccan/str_talloc/str_talloc.h>
+#include <ccan/str_talloc/str_talloc.c>
+#include <ccan/tap/tap.h>
+
+int main(int argc, char *argv[])
+{
+ void *ctx = talloc_init("toplevel");
+ unsigned int top_blocks = talloc_total_blocks(ctx);
+ char *a, *b;
+ /* If it accesses this, it will crash. */
+ char **invalid = (char **)1L;
+
+ plan_tests(25);
+ /* Simple matching. */
+ ok1(strreg(ctx, "hello world!", "hello") == true);
+ ok1(strreg(ctx, "hello world!", "hi") == false);
+
+ /* No parentheses means we don't use any extra args. */
+ ok1(strreg(ctx, "hello world!", "hello", invalid) == true);
+ ok1(strreg(ctx, "hello world!", "hi", invalid) == false);
+
+ ok1(strreg(ctx, "hello world!", "[a-z]+", invalid) == true);
+ ok1(strreg(ctx, "hello world!", "([a-z]+)", &a, invalid) == true);
+ /* Found string */
+ ok1(streq(a, "hello"));
+ /* Allocated off ctx */
+ ok1(talloc_find_parent_byname(a, "toplevel") == ctx);
+ talloc_free(a);
+
+ ok1(strreg(ctx, "hello world!", "([a-z]*) ([a-z]+)",
+ &a, &b, invalid) == true);
+ ok1(streq(a, "hello"));
+ ok1(streq(b, "world"));
+ ok1(talloc_find_parent_byname(a, "toplevel") == ctx);
+ ok1(talloc_find_parent_byname(b, "toplevel") == ctx);
+ talloc_free(a);
+ talloc_free(b);
+
+ /* * after parentheses returns last match. */
+ ok1(strreg(ctx, "hello world!", "([a-z])* ([a-z]+)",
+ &a, &b, invalid) == true);
+ ok1(streq(a, "o"));
+ ok1(streq(b, "world"));
+ talloc_free(a);
+ talloc_free(b);
+
+ /* Nested parentheses are ordered by open brace. */
+ ok1(strreg(ctx, "hello world!", "(([a-z]*) world)",
+ &a, &b, invalid) == true);
+ ok1(streq(a, "hello world"));
+ ok1(streq(b, "hello"));
+ talloc_free(a);
+ talloc_free(b);
+
+ /* Nested parentheses are ordered by open brace. */
+ ok1(strreg(ctx, "hello world!", "(([a-z]*) world)",
+ &a, &b, invalid) == true);
+ ok1(streq(a, "hello world"));
+ ok1(streq(b, "hello"));
+ talloc_free(a);
+ talloc_free(b);
+
+ /* NULL means we're not interested. */
+ ok1(strreg(ctx, "hello world!", "((hello|goodbye) world)",
+ &a, NULL, invalid) == true);
+ ok1(streq(a, "hello world"));
+ talloc_free(a);
+
+ /* No leaks! */
+ ok1(talloc_total_blocks(ctx) == top_blocks);
+ talloc_free(ctx);
+ talloc_disable_null_tracking();
+
+ return exit_status();
+}
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