Add filter functionality.

1 files changed, 123 insertions, 0 deletions

diff --git a/debug_filter.c b/debug_filter.c
new file mode 100644
index 0000000..f93b4c9
--- /dev/null
+++ b/debug_filter.c
@@ -0,0 +1,123 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set et sw=2 ts=2: */
+/***************************************************************************
+ *            debug_filter.c
+ *
+ *  Fri Dec  7 14:24:27 CET 2012
+ *  Copyright 2012 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of Debug Module.
+ *
+ *  Debug Module 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.
+ *
+ *  Debug Module 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 Debug Module; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#include "debug_filter.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+#define NELEM(x)	(sizeof(x)/sizeof((x)[0]))
+struct __debug_channel
+{
+	char name[32];
+	unsigned flags;
+};
+
+#define __DEBUG_CHANNEL_MAX 256
+
+static struct __debug_channel debug_channel[__DEBUG_CHANNEL_MAX];
+static unsigned n_debug_channel = 0;
+static unsigned debug_flags = (1 << __class_err) | (1 << __class_fixme);
+
+int dbg_filter_enabled(const enum __debug_class cl, const char *ch)
+{
+	unsigned i;
+	for(i = 0; i < n_debug_channel; i++) {
+		if(!strcmp(ch, debug_channel[i].name)) {
+			return (debug_channel[i].flags & (1 << cl)) != 0;
+		}
+	}
+	return debug_flags & (1 << cl);
+}
+
+extern const char * const *debug_class_str;
+
+/*
+ * fmt := [set[,set]*]*
+ * set := [+-]channel
+ *     |  class[+-]channel
+ *     |  [+-]all
+ */
+int dbg_filter_parse(const char *filter)
+{
+	char *s;
+	char *next;
+	char *opt;
+
+	if(!(s = strdup(filter))) return 1;
+
+	for(opt = s; opt; opt = next) {
+		int set = 0;
+		int clr = 0;
+		unsigned i;
+		if((next = strchr(opt, ','))) *next++ = '\0';
+		char *p = opt + strcspn(opt, "+-");
+		if(!*p) p = opt;	// All chars -> a channel name
+		if(p > opt) {
+			// we have a class
+			for(i = 0; i < NELEM(debug_class_str); i++) {
+				int n = strlen(debug_class_str[i]);
+				if(n != (p - opt)) continue;
+				if(!memcmp(opt, debug_class_str[i], n)) {
+					// Found the class
+					if(*p == '+')
+						set = 1 << i;
+					else
+						clr = 1 << i;
+					break;
+				}
+			}
+			if(i == NELEM(debug_class_str)) continue;
+		} else {
+			if(*p == '-')
+				clr = ~0;
+			else
+				set = ~0;
+		}
+		if(*p == '+' || *p == '-') p++;
+		if(!*p) continue;
+		if(!strcmp("all", p)) {
+			debug_flags = (debug_flags & ~clr) | set;
+		} else {
+			if(strlen(p) >= sizeof(debug_channel[0].name)) continue;
+			for(i = 0; i < n_debug_channel; i++) {
+				if(!strcmp(p, debug_channel[i].name)) {
+					debug_channel[i].flags = (debug_channel[i].flags & ~clr) | set;
+					break;
+				}
+			}
+			if(i == n_debug_channel && n_debug_channel < __DEBUG_CHANNEL_MAX) {
+				strcpy(debug_channel[i].name, p);
+				debug_channel[i].flags = (debug_flags & ~clr) | set;
+				n_debug_channel++;
+			}
+		}
+	}
+	free(s);
+
+  return 0;
+}