fusl/src/legacy/getpass.c

#define _GNU_SOURCE
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>

char* getpass(const char* prompt) {
  int fd;
  struct termios s, t;
  ssize_t l;
  static char password[128];

  if ((fd = open("/dev/tty", O_RDWR | O_NOCTTY | O_CLOEXEC)) < 0)
    return 0;

  tcgetattr(fd, &t);
  s = t;
  t.c_lflag &= ~(ECHO | ISIG);
  t.c_lflag |= ICANON;
  t.c_iflag &= ~(INLCR | IGNCR);
  t.c_iflag |= ICRNL;
  tcsetattr(fd, TCSAFLUSH, &t);
  tcdrain(fd);

  dprintf(fd, "%s", prompt);

  l = read(fd, password, sizeof password);
  if (l >= 0) {
    if (l > 0 && password[l - 1] == '\n')
      l--;
    password[l] = 0;
  }

  tcsetattr(fd, TCSAFLUSH, &s);

  dprintf(fd, "\n");
  close(fd);

  return l < 0 ? 0 : password;
}