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/*
* Copyright (c) 1999-2003, 2006 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* getkey
*
* A very simple keygrabber.
*
*/
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <sys/poll.h>
#include "popt.h"
static struct termios orig_tp;
static void reset_term(int x) {
tcsetattr(0,TCSANOW,&orig_tp);
_exit(x);
}
int main(int argc, char **argv) {
static const char default_list[] = "";
const char *list;
char *waitmessage = NULL;
char *waitprint, *waitsprint;
int waitseconds=0;
int alarmlen=0;
int ignore_control=0;
struct termios tp;
int r;
struct pollfd ufds; /* only one, no need for an array... */
poptContext context;
struct poptOption options[] = {
{ "wait", 'c', POPT_ARG_INT, &waitseconds, 0, "Number of seconds to wait for keypress", NULL },
{ "message", 'm', POPT_ARG_STRING, &waitmessage, 0, "Message to print out while waiting for string\nNOTE: The message may have a \"%d\" in it, to hold the number of seconds left to wait.", NULL },
{ "ignore-control-chars", 'i', POPT_ARG_NONE, &ignore_control, 0, "Ignore Control-C and Control-D", NULL },
POPT_AUTOHELP
POPT_TABLEEND
};
context = poptGetContext("getkey", argc, (const char **)argv, options,
POPT_CONTEXT_POSIXMEHARDER);
poptSetOtherOptionHelp(context, "[keys]");
r = poptGetNextOpt(context);
if (r < -1) {
fprintf(stderr, "%s: %s\n",
poptBadOption(context, POPT_BADOPTION_NOALIAS),
poptStrerror(r));
return -1;
}
list = poptGetArg(context);
if (list != NULL) {
char *p;
p = strdup(list);
list = p;
while (*p != 0) {
*p = toupper(*p);
p++;
}
} else
list = default_list;
if (waitseconds) {
if (waitseconds < 0) {
fprintf(stderr, "--wait: Invalid time %d seconds\n",
waitseconds);
return -1;
}
alarmlen = waitseconds;
}
tcgetattr(0,&tp);
orig_tp = tp;
signal(SIGTERM,reset_term);
if (alarmlen != 0) {
signal(SIGALRM,reset_term);
alarm(alarmlen);
}
tp.c_iflag=0;
tp.c_oflag &= ~OPOST;
tp.c_lflag &= ~(ISIG | ICANON);
tcsetattr(0,TCSANOW,&tp);
ufds.events = POLLIN;
ufds.fd = 0;
if (waitmessage) {
waitprint = alloca (strlen(waitmessage)+15); /* long enough */
waitprint[0] = '\r';
waitsprint = waitprint + 1;
}
while (1) {
if (waitmessage) {
sprintf (waitsprint, waitmessage, waitseconds);
write (1, waitprint, strlen(waitprint));
}
r = poll(&ufds, 1, alarmlen ? 1000 : -1);
if (r == 0) {
/* we have waited a whole second with no keystroke... */
waitseconds--;
}
if (r > 0) {
char ch;
read(0, &ch, sizeof(ch));
ch = toupper(ch);
/* Die if we get a control-c or control-d */
if (ignore_control == 0 && (ch == 3 || ch == 4))
reset_term(1);
/* Don't let a null character be interpreted as a match
by strchr */
if (ch != 0
&& (strcmp(list, "") == 0 || strchr(list, ch) != NULL))
reset_term(0);
}
}
}
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