Add glob.c/.h, filter.c/.h

- these should be useful when implementing filtering expressions

1 files changed, 94 insertions, 0 deletions

diff --git a/filter.h b/filter.h
new file mode 100644
index 0000000..23ca382
--- /dev/null
+++ b/filter.h
@@ -0,0 +1,94 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2012 Petr Machata, Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+/* This file contains declarations and types for working with symbol
+ * filters.  */
+
+#ifndef FILTER_H
+#define FILTER_H
+
+#include <sys/types.h>
+#include <regex.h>
+
+struct library;
+struct library_symbol;
+
+enum filter_lib_matcher_type {
+	/* Match by name.  */
+	FLM_NAME,
+	/* Match main binary.  */
+	FLM_MAIN,
+};
+
+struct filter_lib_matcher {
+	enum filter_lib_matcher_type type;
+	regex_t libname_re;
+};
+
+enum filter_rule_type {
+	FR_ADD,
+	FR_SUBTRACT,
+};
+
+struct filter_rule {
+	struct filter_rule *next;
+	struct filter_lib_matcher *lib_matcher;
+	regex_t symbol_re; /* Regex for matching symbol name.  */
+	enum filter_rule_type type;
+};
+
+struct filter {
+	struct filter *next;
+	struct filter_rule *rules;
+};
+
+void filter_init(struct filter *filt);
+void filter_destroy(struct filter *filt);
+
+/* Both SYMBOL_RE and MATCHER are owned and destroyed by RULE.  */
+void filter_rule_init(struct filter_rule *rule, enum filter_rule_type type,
+		      struct filter_lib_matcher *matcher,
+		      regex_t symbol_re);
+
+void filter_rule_destroy(struct filter_rule *rule);
+
+/* RULE is added to FILT and owned and destroyed by it.  */
+void filter_add_rule(struct filter *filt, struct filter_rule *rule);
+
+/* Create a matcher that matches based on LIBNAME_RE is owned and
+ * destroyed by MATCHER.  */
+void filter_lib_matcher_name_init(struct filter_lib_matcher *matcher,
+				  regex_t libname_re);
+
+/* Create a matcher that matches main binary.  */
+void filter_lib_matcher_main_init(struct filter_lib_matcher *matcher);
+
+void filter_lib_matcher_destroy(struct filter_lib_matcher *matcher);
+
+/* Ask whether FILTER might match a symbol in LIB.  0 if no, non-0 if
+ * yes.  Note that positive answer doesn't mean that anything will
+ * actually be matched, just that potentially it could.  */
+int filter_matches_library(struct filter *filt, struct library *lib);
+
+/* Ask whether FILTER matches this symbol.  Returns 0 if it doesn't,
+ * or non-0 value if it does.  */
+int filter_matches_symbol(struct filter *filt, struct library_symbol *sym);
+
+#endif /* FILTER_H */