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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/select.h>
// utility to read non-blockingly from stdin.
// returns exit code 1 on EOF. returns EXIT_FAILURE on error.
// public domain
int main(int argc, char *argv[]) {
long int max_chars = -1;
if (argc > 1) max_chars = atoi(argv[1]);
fd_set readset;
FD_ZERO(&readset);
FD_SET(STDIN_FILENO, &readset);
struct timeval timeout = {0,0};
int result;
size_t n = 0;
while ((result = select(1, &readset, NULL, NULL, &timeout)) != -1) {
if (result == 0) return 0; // there is nothing to read
int c = getc(stdin);
if (c == EOF) {
if (feof(stdin)) return 1;
else {
perror(argv[0]);
return EXIT_FAILURE;
}
} else putc(c, stdout);
if (++n == max_chars) return 0;
}
return 0;
}
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