Initial commit

filter.c

@@ -0,0 +1,76 @@
+
+#include <assert.h>
+#include <pcre.h>
+#include <stdio.h>
+#include <string.h>
+#include "filter.h"
+
+static inline pcre* compile(const char *pattern) {
+
+	const char *error;
+	int eoffset;
+	pcre *regex;
+
+	regex = pcre_compile(pattern, 0, &error, &eoffset, NULL);
+	if (!regex) {
+		fprintf(stderr, "Error compiling expression\n");
+		return NULL;
+	}
+
+	return regex;
+}
+
+static inline int match(pcre *pcre, const char *subject) {
+
+	int ovector[1];
+
+	return pcre_exec(pcre, NULL, subject, strlen(subject), 0, 0,
+		ovector, sizeof(ovector));
+}
+
+int filter_check_syntax(const char *pattern) {
+
+	const char *error;
+	int eoffset;
+	pcre *regex;
+
+	regex = pcre_compile(pattern, 0, &error, &eoffset, NULL);
+	if (!regex) {
+		fprintf(stderr, "filter: error in expression '%s': %s\n",
+			pattern, error);
+		return 0;
+	}
+	return 1;
+}
+
+int filter_match(const char *pattern, const char *subject) {
+
+	pcre *regex;
+	int rc;
+
+	if (!pattern || !subject)
+		return 0;
+
+	regex = compile(pattern);
+	if (!regex)
+		return 0;
+
+	rc = match(regex, subject);
+
+	pcre_free(regex);
+
+	return rc > 0;
+}
+
+int filter_match_list(char **patterns, unsigned n, const char *subject) {
+
+	int i;
+
+	for(i=0; i < n; i++) {
+
+		/* return true at the first matching pattern */
+		if (filter_match(patterns[i], subject))
+			return 1;
+	}
+	return 0;
+}