Enable parsing of several commands in single buffer.

It is not guaranteed that each command will come in it's own buffer. In
fact when several changes are made at once the commands are not separated.

cmd.c

 
 bool parse_command(struct videohub_data *data, char *cmd) {
 	unsigned int i;
+	if (!strlen(cmd))
+		return false;
 	struct videohub_commands *v = NULL;
 	for (i = 0; i < ARRAY_SIZE(videohub_commands); i++) {
 		if (!videohub_commands[i].txt)
 
 	return true;
 }
+
+int parse_text_buffer(struct videohub_data *data, char *cmd_buffer) {
+	// The buffer contains only one command, no splitting is needed
+	if (!strstr(cmd_buffer, "\n\n"))
+		return parse_command(data, cmd_buffer);
+	// Split commands and parse them one by one
+	int ok_commands = 0;
+	char *bcopy = xstrdup(cmd_buffer);
+	char *newcmd, *cmd = bcopy;
+	while(1) {
+		newcmd = strstr(cmd, "\n\n"); // Find next command
+		if (!newcmd) {
+			if (parse_command(data, cmd)) // Parse current command
+				ok_commands++;
+			break;
+		}
+		newcmd[0] = '\0'; // Terminate previous command
+		if (parse_command(data, cmd)) // Parse previous command
+			ok_commands++;
+		cmd = newcmd + 2; // Advance cmd to the next command
+	}
+	free(bcopy);
+	return ok_commands;
+}

cmd.h

 #define CMD_H
 
 bool parse_command(struct videohub_data *d, char *cmd);
+bool parse_text_buffer(struct videohub_data *data, char *cmd_buffer);
 
 #endif

videohubctrl.c

 	char buf[8192 + 1];
 	memset(buf, 0, sizeof(buf));
 	while ((ret = fdread_ex(d->dev_fd, buf, sizeof(buf) - 1, 5, 0, 0)) >= 0) {
-		if (parse_command(d, buf))
-			ncommands++;
+		ncommands += parse_text_buffer(d, buf);
 		memset(buf, 0, sizeof(buf));
 	}
 	return ncommands;