busybox/libbb/bb_askpass.c
Denys Vlasenko 02859aaeb2 use auto_string() where appropriate to kill a few statics
Custom linker script 'busybox_ldscript' found, using it
function                                             old     new   delta
static.str                                             4       -      -4
static.passwd                                          4       0      -4
bb_ask                                               322     311     -11
ether_print                                           63      47     -16
UNSPEC_print                                          82      66     -16
INET_sprint                                           59      38     -21
INET6_sprint                                          54      30     -24
make_human_readable_str                              292     235     -57
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 0/7 up/down: 0/-153)           Total: -153 bytes
   text	   data	    bss	    dec	    hex	filename
 939880	    992	  17480	 958352	  e9f90	busybox_old
 939736	    992	  17456	 958184	  e9ee8	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-09 18:16:40 +02:00

94 lines
2.0 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Ask for a password
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include "libbb.h"
/* do nothing signal handler */
static void askpass_timeout(int UNUSED_PARAM ignore)
{
}
char* FAST_FUNC bb_ask_stdin(const char *prompt)
{
return bb_ask(STDIN_FILENO, 0, prompt);
}
char* FAST_FUNC bb_ask(const int fd, int timeout, const char *prompt)
{
/* Was static char[BIGNUM] */
enum { sizeof_passwd = 128 };
char *passwd;
char *ret;
int i;
struct sigaction sa, oldsa;
struct termios tio, oldtio;
tcflush(fd, TCIFLUSH);
/* Was buggy: was printing prompt *before* flushing input,
* which was upsetting "expect" based scripts of some users.
*/
fputs(prompt, stdout);
fflush_all();
tcgetattr(fd, &oldtio);
tio = oldtio;
#if 0
/* Switch off UPPERCASE->lowercase conversion (never used since 198x)
* and XON/XOFF (why we want to mess with this??)
*/
# ifndef IUCLC
# define IUCLC 0
# endif
tio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
#endif
/* Switch off echo */
tio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL);
tcsetattr(fd, TCSANOW, &tio);
memset(&sa, 0, sizeof(sa));
/* sa.sa_flags = 0; - no SA_RESTART! */
/* SIGINT and SIGALRM will interrupt reads below */
sa.sa_handler = askpass_timeout;
sigaction(SIGINT, &sa, &oldsa);
if (timeout) {
sigaction_set(SIGALRM, &sa);
alarm(timeout);
}
passwd = auto_string(xmalloc(sizeof_passwd));
ret = passwd;
i = 0;
while (1) {
int r = read(fd, &ret[i], 1);
if ((i == 0 && r == 0) /* EOF (^D) with no password */
|| r < 0
) {
/* read is interrupted by timeout or ^C */
ret = NULL;
break;
}
if (r == 0 /* EOF */
|| ret[i] == '\r' || ret[i] == '\n' /* EOL */
|| ++i == sizeof_passwd-1 /* line limit */
) {
ret[i] = '\0';
break;
}
}
if (timeout) {
alarm(0);
}
sigaction_set(SIGINT, &oldsa);
tcsetattr(fd, TCSANOW, &oldtio);
bb_putchar('\n');
fflush_all();
return ret;
}