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[QUOTE="Ben Bacarisse, post: 5029431"]
Here's an example (not my code):

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
char buf [2048];
FILE *fp_in;
FILE *fp_out;
size_t ch_read;
if ((fp_in = fopen ("as.exe", "rb")) == NULL)
{
fprintf (stderr, "failed to open input file\n");
exit (EXIT_FAILURE);
}
if ((fp_out = fopen ("a.exe", "wb")) == NULL)
{
fprintf (stderr, "failed to open output file\n");
fclose (fp_in);
exit (EXIT_FAILURE);
}
ch_read = sizeof(buf);
while (ch_read == sizeof(buf))
{
ch_read = fread (buf, 1, sizeof(buf), fp_in);
if ((ch_read != sizeof(buf)  &&  ferror(fp_in))
{
fprintf (stderr, "read error\n");
fclose (fp_in);
fclose (fp_out);
exit (EXIT_FAILURE);
}
if (fwrite (buf, 1, ch_read, fp_out) != ch_read)
{
fprintf (stderr, "write error\n");
fclose (fp_in);
fclose (fp_out);
exit (EXIT_FAILURE);
}
}
fclose (fp_in);
fclose (fp_out);
return 0;
}

It's Nick Keighley's example from 2008 -- simplified to remove a couple
of possibly confusing C idioms.

Source is Message-ID:
<657c2320-02d8-4413-9281-dee4a63d1583@f63g2000hsf.googlegroups.com>
[/QUOTE]

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