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#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
char buf[BUFSIZ];
const char * const utf8bom = "\xef\xbb\xbf";
static void usage(const char *);
static void
usage(const char * const prog)
{
fprintf(stderr, "usage: %s\n", prog);
exit(1);
}
int
main(const int argc, const char * const argv[])
{
size_t nread;
if (argc > 1)
usage(argv[0]);
nread = fread(buf, 1, strlen(utf8bom), stdin);
if (nread == 0)
return 0;
if (strcmp(buf, utf8bom) != 0)
if (fwrite(buf, 1, nread, stdout) < nread)
exit(1);
for (;;) {
nread = fread(buf, 1, sizeof buf, stdin);
if (nread == 0)
return ferror(stdin) && 1;
if (fwrite(buf, 1, nread, stdout) < nread)
exit(1);
}
return 0;
}
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