src/libs/bsd/getpass.c

   1 /*
   2  * Copyright 2006, Haiku, Inc. All Rights Reserved.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Authors:
   6  *              Axel Dörfler, axeld@pinc-software.de
   7  */
   8
   9
  10 #include <stdbool.h>
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include <termios.h>
  14 #include <unistd.h>
  15
  16
  17 char *
  18 getpass(const char *prompt)
  19 {
  20         static char password[128];
  21         struct termios termios;
  22         bool changed = false;
  23
  24         // Turn off echo
  25
  26         if (tcgetattr(fileno(stdin), &termios) == 0) {
  27                 struct termios noEchoTermios = termios;
  28
  29                 noEchoTermios.c_lflag &= ~(ECHO | ISIG);
  30                 changed = tcsetattr(fileno(stdin), TCSAFLUSH, &noEchoTermios) == 0;
  31     }
  32
  33         // Show prompt
  34         fputs(prompt, stdout);
  35         fflush(stdout);
  36
  37         // Read password
  38         if (fgets(password, sizeof(password), stdin) != NULL) {
  39                 size_t length = strlen(password);
  40
  41                 if (password[length - 1] == '\n')
  42                         password[length - 1] = '\0';
  43
  44                 if (changed) {
  45                         // Manually move to the next line
  46                         putchar('\n');
  47                 }
  48         }
  49
  50         // Restore termios setting
  51         if (changed)
  52                 tcsetattr(fileno(stdin), TCSAFLUSH, &termios);
  53
  54         return password;
  55 }