#include "int.h"
#include "sys.h"


int main() {
  // Test the write syscall
  intptr_t n = write(STDIO, "Hello\n", 6);
  if(n != 6) return n;

  // Test the fork syscall
  uint64_t pid = fork();
  // Print the pid in hex
  char msg[17] = {' '};
  msg[16] = '\n';
  for(int i = 0; i < 16; ++i) {
    char nibble = (pid >> ((15 - i) * 4)) & 0xf;
    char c;
    if (nibble > 9) {c = nibble + '7';}
    else {c = nibble + '0';}
    msg[i] = c;
  }
  write(STDIO, msg, 17);

  // Child process exits
  if(pid == 0) return 0;
  //TODO: wait on child to remove zombie process

  // Test the read syscall
  #define INPUT_BUFFER_LEN 4096
  char input_buffer[INPUT_BUFFER_LEN] = {0};
  write(STDIO, "Enter some text:", 16);
  intptr_t n_read = read(STDIO, input_buffer, INPUT_BUFFER_LEN);
  write(STDIO, input_buffer, n_read);

  return 69;
}

void __libc_start_main() {exit(main());}

void _start() {
  __libc_start_main();
}

void __start() {
  _start();
}