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 tcflush(fd, TCIFLUSH);
34 /* Was buggy: was printing prompt *before* flushing input,
35 * which was upsetting "expect" based scripts of some users.
37 fputs(prompt, stdout);
40 tcgetattr(fd, &oldtio);
43 /* Switch off UPPERCASE->lowercase conversion (never used since 198x)
44 * and XON/XOFF (why we want to mess with this??)
49 tio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
52 tio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL);
53 tcsetattr(fd, TCSANOW, &tio);
55 memset(&sa, 0, sizeof(sa));
56 /* sa.sa_flags = 0; - no SA_RESTART! */
57 /* SIGINT and SIGALRM will interrupt reads below */
58 sa.sa_handler = askpass_timeout;
59 sigaction(SIGINT, &sa, &oldsa);
61 sigaction_set(SIGALRM, &sa);
66 passwd = xmalloc(sizeof_passwd);
70 int r = read(fd, &ret[i], 1);
71 if ((i == 0 && r == 0) /* EOF (^D) with no password */
74 /* read is interrupted by timeout or ^C */
79 || ret[i] == '\r' || ret[i] == '\n' /* EOL */
80 || ++i == sizeof_passwd-1 /* line limit */
90 sigaction_set(SIGINT, &oldsa);
91 tcsetattr(fd, TCSANOW, &oldtio);