1 /* vi: set sw=4 ts=4: */
4 * I use a static buffer in this function. Plan accordingly.
6 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
13 /* do nothing signal handler */
14 static void askpass_timeout(int UNUSED_PARAM ignore)
18 char* FAST_FUNC bb_ask_stdin(const char *prompt)
20 return bb_ask(STDIN_FILENO, 0, prompt);
22 char* FAST_FUNC bb_ask(const int fd, int timeout, const char *prompt)
24 /* Was static char[BIGNUM] */
25 enum { sizeof_passwd = 128 };
30 struct sigaction sa, oldsa;
31 struct termios tio, oldtio;
33 fputs(prompt, stdout);
35 tcflush(fd, TCIFLUSH);
37 tcgetattr(fd, &oldtio);
40 /* Switch off UPPERCASE->lowercase conversion (never used since 198x)
41 * and XON/XOFF (why we want to mess with this??)
46 tio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
49 tio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL);
50 tcsetattr(fd, TCSANOW, &tio);
52 memset(&sa, 0, sizeof(sa));
53 /* sa.sa_flags = 0; - no SA_RESTART! */
54 /* SIGINT and SIGALRM will interrupt reads below */
55 sa.sa_handler = askpass_timeout;
56 sigaction(SIGINT, &sa, &oldsa);
58 sigaction_set(SIGALRM, &sa);
63 passwd = xmalloc(sizeof_passwd);
67 int r = read(fd, &ret[i], 1);
68 if ((i == 0 && r == 0) /* EOF (^D) with no password */
71 /* read is interrupted by timeout or ^C */
76 || ret[i] == '\r' || ret[i] == '\n' /* EOL */
77 || ++i == sizeof_passwd-1 /* line limit */
87 sigaction_set(SIGINT, &oldsa);
88 tcsetattr(fd, TCSANOW, &oldtio);