Added regexp based screen filtering.

screenfilter.c

@@ -0,0 +1,56 @@
+/*
+ * screenfilter.c:
+ *
+ * Copyright (c) 2002 DecisionSoft Ltd.
+ * Paul Warren (pdw) Fri Oct 25 10:21:00 2002
+ *
+ */
+
+#include <sys/types.h>
+#include <regex.h>
+#include <stdio.h>
+#include "iftop.h"
+#include "options.h"
+
+static const char rcsid[] = "$Id$";
+
+extern options_t options ;
+
+regex_t preg;
+
+int screen_filter_set(char* s) {
+    int r;
+
+    if(options.screenfilter != NULL) {
+        xfree(options.screenfilter);
+        options.screenfilter = NULL;
+        regfree(&preg);
+    }
+
+    r = regcomp(&preg, s, 0);
+      
+    if(r == 0) {
+        options.screenfilter = s;
+        return 1;
+    }
+    else {
+        xfree(s);
+        return 0;
+    }
+}
+
+int screen_filter_match(char *s) {
+    int r;
+    if(options.screenfilter == NULL) {
+        return 1;
+    }
+
+    r = regexec(&preg, s, 0, NULL, 0);
+    if(r == 0) {
+        return 1;
+    }
+    else {
+        return 0;
+    }
+}
+