/**
* Start Tiny Shell process.
*/
void tiny_shell_init() {
uint32_t buff_position = 0;
uint8_t prompt_line = 0;
parse_prompt();
print_prompt();
// start scan keyboard...
while(1) {
enum KEYCODE key = scan_keyboard();
switch (key) {
case KEY_RETURN:
// terminate command_buffer string
command_buffer[buff_position] = 0;
vga_text_mode_putc('\n');
if (!tsh_exec()) {
kprintf("tshell: %s: command not found", command_buffer);
}
// reset buffer position
buff_position = 0;
print_prompt();
prompt_line = 0;
break;
case KEY_BACKSPACE:
// delete previous character on line
if (vga_text_mode_cursor_getX() >= _prompt_info.prompt_len && prompt_line==0) {
vga_text_mode_putc(kbrd_key_to_ascii(key));
if (buff_position>0)
buff_position--;
}
// roll-back cursor to previous line and delete character
if (prompt_line>0) {
if (prompt_line>0 && ((buff_position+_prompt_info.prompt_len-1) == (prompt_line)*COLS))
prompt_line--;
vga_text_mode_putc(kbrd_key_to_ascii(key));
if (buff_position>0)
buff_position--;
}
break;
default :
if (isascii(key)) {
if (buff_position <= max_len_com_buffer-1) {
command_buffer[buff_position++] = kbrd_key_to_ascii(key);
if (prompt_line>0 && ((buff_position+_prompt_info.prompt_len-2) == (prompt_line+1)*COLS))
prompt_line++;
if (prompt_line==0 && (buff_position+_prompt_info.prompt_len-1 > COLS))
prompt_line++;
vga_text_mode_putc(kbrd_key_to_ascii(key));
}
}
}
}
}
int syscall_read(unsigned int fd, char * buf, unsigned int size)
{
int read = -1;
enum KEYCODE keycode = KEY_UNKNOWN;
char code;
/* this function will return when the buffer gets consumed! */
while ((keycode = kbrd_get_key()) != KEY_UNKNOWN) {
read++;
/* Most naive version to get keys working */
code = kbrd_key_to_ascii(keycode);
if(code != 0)
{
buf[read] = code;
}
}
return read;
}
