Fixed potential buffer overflow in Cbuf_Execute, and implemented more Unix-like cmd/cvar tab completion.

src/cmd.c

@@ -201,6 +201,10 @@ void Cbuf_Execute(void){
 				break;
 		}
 		
+		if(i > MAX_STRING_CHARS){  //length check each command
+			Com_Printf("Command exceeded %i chars, discarded\n", MAX_STRING_CHARS);
+			return;
+		}
 		
 		memcpy(line, text, i);
 		line[i] = 0;
@@ -709,31 +713,42 @@ Cmd_CompleteCommand
 */
 char *Cmd_CompleteCommand(char *partial){
 	cmd_function_t *cmd;
-	int	len;
 	cmdalias_t *a;
+	char *match = NULL;
+	int len;
 	
 	len = strlen(partial);
 	
 	if(!len)
 		return NULL;
 		
-	// check for exact match
+	// check for exact match in commands
 	for(cmd = cmd_functions; cmd; cmd = cmd->next)
 		if(!strcmp(partial, cmd->name))
 			return cmd->name;
+	
+	// and then aliases
 	for(a = cmd_alias; a; a = a->next)
 		if(!strcmp(partial, a->name))
 			return a->name;
 	
-	// check for partial match
-	for(cmd = cmd_functions; cmd; cmd = cmd->next)
-		if(!strncmp(partial, cmd->name, len))
-			return cmd->name;
-	for(a = cmd_alias; a; a = a->next)
-		if(!strncmp(partial, a->name, len))
-			return a->name;
+	// check for partial matches in commands
+	for(cmd = cmd_functions; cmd; cmd = cmd->next){
+		if(!strncmp(partial, cmd->name, len)){
+			Com_Printf("%c%s\n", (char)1, cmd->name);
+			match = cmd->name;
+		}
+	}
 	
-	return NULL;
+	// and then aliases
+	for(a = cmd_alias; a; a = a->next){
+		if(!strncmp(partial, a->name, len)){
+			Com_Printf("%c%s\n", (char)1, a->name);
+			match = a->name;
+		}
+	}
+	
+	return match;
 }
 
 

src/cvar.c

@@ -90,6 +90,7 @@ Cvar_CompleteVariable
 */
 char *Cvar_CompleteVariable(char *partial){
 	cvar_t *cvar;
+	char *match = NULL;
 	int len;
 	
 	len = strlen(partial);
@@ -97,17 +98,20 @@ char *Cvar_CompleteVariable(char *partial){
 	if(!len)
 		return NULL;
 		
-	// check exact match
+	// check for exact match
 	for(cvar = cvar_vars; cvar; cvar = cvar->next)
 		if(!strcmp(partial, cvar->name))
 			return cvar->name;
 	
-	// check partial match
-	for(cvar = cvar_vars; cvar; cvar = cvar->next)
-		if(!strncmp(partial, cvar->name, len))
-			return cvar->name;
+	// check for partial matches
+	for(cvar = cvar_vars; cvar; cvar = cvar->next){
+		if(!strncmp(partial, cvar->name, len)){
+			Com_Printf("%s\n", cvar->name);
+			match = cvar->name;
+		}
+	}
 	
-	return NULL;
+	return match;
 }
 
 

src/keys.c

@@ -167,16 +167,27 @@ keyname_t keynames[] = {
 */
 
 void CompleteCommand(void){
-	char	*cmd, *s;
+	char	*cmd, *cvar, *partial;
 	
-	s = key_lines[edit_line] + 1;
-	if(*s == '\\' || *s == '/')
-		s++;
+	partial = key_lines[edit_line] + 1;
+	if(*partial == '\\' || *partial == '/')
+		partial++;
 	
-	cmd = Cmd_CompleteCommand(s);
-	if(!cmd)
-		cmd = Cvar_CompleteVariable(s);
-	if(cmd){
+	if(!*partial) return;  //lets start with at least something
+	
+	cmd = Cmd_CompleteCommand(partial);  //partial command lookup
+	
+	if(!cmd || strcmp(cmd, partial)){  //not exact command match
+		
+		cvar = Cvar_CompleteVariable(partial);  //so try cvars
+		
+		if(cvar){  //found something
+			if(!strcmp(cvar, partial)) cmd = cvar;  //exact cvar match
+			else cmd = NULL;  //no exact match, partial for both
+		}
+	}
+	
+	if(cmd){  //found something
 		key_lines[edit_line][1] = '/';
 		strcpy(key_lines[edit_line] + 2, cmd);
 		key_linepos = strlen(cmd) + 2;