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#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>
/* A very simple keygrabber. */
struct termios tp;
void reset_term(int x) {
tcsetattr(0,TCSANOW,&tp);
exit(x);
}
int main(int argc, char **argv) {
char foo[2];
char *list = NULL;
char *waitmessage = NULL;
char *waitprint, *waitsprint;
int waitseconds=0;
int alarmlen=0;
int tp_if,tp_of,tp_lf;
int x, r;
struct pollfd ufds; /* only one, no need for an array... */
for (++argv, --argc; argc; argc--, argv++) {
if (argv[0][0]=='-') {
if (argv[0][1]=='c') {
argc--; argv++;
waitseconds = atoi(argv[0]);
} else if (argv[0][1]=='m') {
argc--; argv++;
waitmessage=argv[0];
} else if (isdigit(argv[0][1])) {
waitseconds = atoi(argv[0]);
}
} else {
list = argv[0];
for (x=0;list[x];x++) list[x]=toupper(list[x]);
}
}
if (waitseconds) {
alarmlen = waitseconds;
}
foo[0]=foo[1]='\0';
signal(SIGTERM,reset_term);
alarm(alarmlen);
signal(SIGALRM,reset_term);
tcgetattr(0,&tp);
tp_if=tp.c_iflag;
tp_of=tp.c_oflag;
tp_lf=tp.c_lflag;
tp.c_iflag=0;
tp.c_oflag &= ~OPOST;
tp.c_lflag &= ~(ISIG | ICANON);
tcsetattr(0,TCSANOW,&tp);
tp.c_iflag=tp_if;
tp.c_oflag=tp_of;
tp.c_lflag=tp_lf;
ufds.events = POLLIN;
ufds.fd = 0;
if (waitseconds && waitmessage) {
waitprint = alloca (strlen(waitmessage)+15); /* long enough */
waitprint[0] = '\r';
waitsprint = waitprint + 1;
}
while (1) {
if (waitseconds) {
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) {
read(0,foo,1);
foo[0]=toupper(foo[0]);
/* Die if we get a control-c or control-d */
if (foo[0]==3 || foo[0]==4) reset_term(1);
if ((!list) || strstr(list,foo)) {
reset_term(0);
}
}
}
}
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