Fixed infinite loop in verbose/debug message output.

Setting the module/filename specific message level and then changing it
resulted in the linked list being looped on itself.  Traversing this
linked list is an infinite loop if what you are looking for is not in the
list.

Also plugged some CLI parsing holes in the associated CLI command:

* Removing a nonexistent module from the list actually added it with a
level of zero.

* Setting the non-module specific level to zero is now equivalent to
setting it to "off" as documented.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@291073 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/cli.c

@@ -363,6 +363,7 @@ static char *handle_verbose(struct ast_cli_entry *e, int cmd, struct ast_cli_arg
 {
 	int oldval;
 	int newlevel;
+	unsigned int is_debug;
 	int atleast = 0;
 	int fd = a->fd;
 	int argc = a->argc;
@@ -432,21 +433,22 @@ static char *handle_verbose(struct ast_cli_entry *e, int cmd, struct ast_cli_arg
 		dst = &option_debug;
 		oldval = option_debug;
 		what = "Core debug";
+		is_debug = 1;
 	} else {
 		dst = &option_verbose;
 		oldval = option_verbose;
 		what = "Verbosity";
+		is_debug = 0;
 	}
 	if (argc == e->args + 1 && !strcasecmp(argv[e->args], "off")) {
-		unsigned int debug = (*what == 'C');
 		newlevel = 0;
 
-		dfl = debug ? &debug_files : &verbose_files;
+		dfl = is_debug ? &debug_files : &verbose_files;
 
 		AST_RWLIST_WRLOCK(dfl);
 		while ((adf = AST_RWLIST_REMOVE_HEAD(dfl, entry)))
 			ast_free(adf);
-		ast_clear_flag(&ast_options, debug ? AST_OPT_FLAG_DEBUG_FILE : AST_OPT_FLAG_VERBOSE_FILE);
+		ast_clear_flag(&ast_options, is_debug ? AST_OPT_FLAG_DEBUG_FILE : AST_OPT_FLAG_VERBOSE_FILE);
 		AST_RWLIST_UNLOCK(dfl);
 
 		goto done;
@@ -458,17 +460,23 @@ static char *handle_verbose(struct ast_cli_entry *e, int cmd, struct ast_cli_arg
 	if (sscanf(argv[e->args + atleast], "%30d", &newlevel) != 1)
 		return CLI_SHOWUSAGE;
 	if (argc == e->args + atleast + 2) {
-		unsigned int debug = (*what == 'C');
-		dfl = debug ? &debug_files : &verbose_files;
-
+		/* We have specified a module name. */
 		fn = argv[e->args + atleast + 1];
 
+		dfl = is_debug ? &debug_files : &verbose_files;
+
 		AST_RWLIST_WRLOCK(dfl);
 
-		if ((adf = find_debug_file(fn, debug)) && !newlevel) {
+		adf = find_debug_file(fn, is_debug);
+		if (!newlevel) {
+			if (!adf) {
+				/* Specified off for a nonexistent entry. */
+				AST_RWLIST_UNLOCK(dfl);
+				return CLI_SUCCESS;
+			}
 			AST_RWLIST_REMOVE(dfl, adf, entry);
 			if (AST_RWLIST_EMPTY(dfl))
-				ast_clear_flag(&ast_options, debug ? AST_OPT_FLAG_DEBUG_FILE : AST_OPT_FLAG_VERBOSE_FILE);
+				ast_clear_flag(&ast_options, is_debug ? AST_OPT_FLAG_DEBUG_FILE : AST_OPT_FLAG_VERBOSE_FILE);
 			AST_RWLIST_UNLOCK(dfl);
 			ast_cli(fd, "%s was %d and has been set to 0 for '%s'\n", what, adf->level, fn);
 			ast_free(adf);
@@ -481,23 +489,36 @@ static char *handle_verbose(struct ast_cli_entry *e, int cmd, struct ast_cli_arg
 				AST_RWLIST_UNLOCK(dfl);
 				return CLI_SUCCESS;
 			}
-		} else if (!(adf = ast_calloc(1, sizeof(*adf) + strlen(fn) + 1))) {
-			AST_RWLIST_UNLOCK(dfl);
-			return CLI_FAILURE;
+			oldval = adf->level;
+			adf->level = newlevel;
+		} else {
+			adf = ast_calloc(1, sizeof(*adf) + strlen(fn) + 1);
+			if (!adf) {
+				AST_RWLIST_UNLOCK(dfl);
+				return CLI_FAILURE;
+			}
+			oldval = adf->level;
+			adf->level = newlevel;
+			strcpy(adf->filename, fn);
+			AST_RWLIST_INSERT_TAIL(dfl, adf, entry);
 		}
 
-		oldval = adf->level;
-		adf->level = newlevel;
-		strcpy(adf->filename, fn);
+		ast_set_flag(&ast_options, is_debug ? AST_OPT_FLAG_DEBUG_FILE : AST_OPT_FLAG_VERBOSE_FILE);
 
-		ast_set_flag(&ast_options, debug ? AST_OPT_FLAG_DEBUG_FILE : AST_OPT_FLAG_VERBOSE_FILE);
-
-		AST_RWLIST_INSERT_TAIL(dfl, adf, entry);
 		AST_RWLIST_UNLOCK(dfl);
 
 		ast_cli(fd, "%s was %d and has been set to %d for '%s'\n", what, oldval, adf->level, adf->filename);
 
 		return CLI_SUCCESS;
+	} else if (!newlevel) {
+		/* Specified level as 0 instead of off. */
+		dfl = is_debug ? &debug_files : &verbose_files;
+
+		AST_RWLIST_WRLOCK(dfl);
+		while ((adf = AST_RWLIST_REMOVE_HEAD(dfl, entry)))
+			ast_free(adf);
+		ast_clear_flag(&ast_options, is_debug ? AST_OPT_FLAG_DEBUG_FILE : AST_OPT_FLAG_VERBOSE_FILE);
+		AST_RWLIST_UNLOCK(dfl);
 	}
 
 done: