mirror of
https://github.com/topjohnwu/ndk-busybox.git
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88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Ask for a password
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* I use a static buffer in this function. Plan accordingly.
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#define PWD_BUFFER_SIZE 256
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/* do nothing signal handler */
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static void askpass_timeout(int ignore)
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{
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}
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char *bb_askpass(int timeout, const char * prompt)
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{
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char *ret;
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int i, size;
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struct sigaction sa;
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struct termios old, new;
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static char passwd[PWD_BUFFER_SIZE];
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tcgetattr(STDIN_FILENO, &old);
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size = sizeof(passwd);
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ret = passwd;
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memset(passwd, 0, size);
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fputs(prompt, stdout);
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fflush(stdout);
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tcgetattr(STDIN_FILENO, &new);
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new.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
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new.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP);
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tcsetattr(STDIN_FILENO, TCSANOW, &new);
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if (timeout) {
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sa.sa_flags = 0;
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sa.sa_handler = askpass_timeout;
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sigaction(SIGALRM, &sa, NULL);
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alarm(timeout);
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}
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if (read(STDIN_FILENO, passwd, size-1) <= 0) {
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ret = NULL;
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} else {
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for(i = 0; i < size && passwd[i]; i++) {
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if (passwd[i]== '\r' || passwd[i] == '\n') {
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passwd[i]= 0;
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break;
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}
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}
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}
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if (timeout) {
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alarm(0);
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}
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tcsetattr(STDIN_FILENO, TCSANOW, &old);
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fputs("\n", stdout);
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fflush(stdout);
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return ret;
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}
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