void cli_loop(void)
{
char buffer[CLI_BUFFER_SIZE];
char c;
int buffer_pos;
uart_printf("%s", cli_prompt);
buffer_pos = 0;
while(1) {
//wait until a character is available
while((c = uart_getchar()) == 0) { ; }
//new line means end of the command
if(c == '\n') {
//only process a command if something was entered
if(buffer_pos) {
buffer[buffer_pos] = '\0';
cli_process_command(buffer);
}
buffer_pos = 0;
memset(buffer, 0, CLI_BUFFER_SIZE);
uart_printf("%s", cli_prompt);
}
//there is more to come...
else if(isgraph(c) || isspace(c)) {
buffer[buffer_pos++] = c;
}
//
else if(c == ASCII_DEL) {
if(buffer_pos) {
buffer_pos--;
buffer[buffer_pos] = '\0';
}
}
//ignore for now
else {
continue;
}
//is the command too long?
if(buffer_pos >= CLI_BUFFER_SIZE) {
uart_printf("\n--Error--, command is too long. Command ignored.\n");
buffer_pos = 0;
memset(buffer, 0, CLI_BUFFER_SIZE);
uart_printf("%s", cli_prompt);
}
}
}
// Parse user-input and implement commands
int cli_service(void)
{
int received_bytes = 0;
char c;
bool buffers_updated = false;
// process received bytes from the ring buffer and move them into the
// command buffer
while ((received_bytes = serial_get_received_bytes(USB_COMM)) != g_receive_buffer.ring_buffer_position) {
// add the current byte to the command buffer
buffers_updated = true;
c = g_receive_buffer.ring_buffer[g_receive_buffer.ring_buffer_position];
LOG("%c", c);
if (c == '\b') {
if (g_receive_buffer.command_buffer_length) {
LOG(" \b"); /* erase previous character from screen */
g_receive_buffer.command_buffer_length--; /* backspace */
} else {
LOG(" "); /* fill back space */
}
} else {
g_receive_buffer.command_buffer[g_receive_buffer.command_buffer_length++] = c;
}
if (g_receive_buffer.ring_buffer_position == sizeof(g_receive_buffer.ring_buffer)) {
g_receive_buffer.ring_buffer_position = 0;
} else {
g_receive_buffer.ring_buffer_position++;
}
}
// Scan for a "line" (that is words followed by \r\n or \r\r\n. If found,
// record that we have a match and null terminate the string
if (buffers_updated) {
char *loc;
int idx;
int end_of_command = false;
bool command_waiting = false;
if ((loc = strstr(g_receive_buffer.command_buffer, "\r\n")) != NULL) {
LOG("\r\n");
idx = loc - g_receive_buffer.command_buffer;
command_waiting = true;
end_of_command = idx + 1;
g_receive_buffer.command_buffer[idx] = '\0';
g_receive_buffer.command_buffer[idx + 1] = '\0';
} else if ((loc = strchr(g_receive_buffer.command_buffer, '\r')) != NULL) {
LOG("\r\n");
idx = loc - g_receive_buffer.command_buffer;
command_waiting = true;
end_of_command = idx;
g_receive_buffer.command_buffer[idx] = '\0';
}
if (command_waiting) {
// now, process the command and move any modify the contents of the
// command_buffer to be in a valid state again
cli_process_command(g_receive_buffer.command_buffer);
LOG("#> ");
memcpy(g_receive_buffer.command_buffer,
&g_receive_buffer.command_buffer[end_of_command + 1],
sizeof(g_receive_buffer.command_buffer) - end_of_command);
g_receive_buffer.command_buffer_length -= (end_of_command + 1);
}
}
return 0;
} // end menu()
