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#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char **const argv)
{
int ret = EXIT_FAILURE;
FILE *in = NULL, *out = NULL;
if (argc < 3)
{
fprintf(stderr, "%s [arg ...] <in-file> <out-file>\n", *argv);
goto end;
}
const char *const in_path = argv[argc - 2],
*const out_path = argv[argc - 1];
if (!(out = fopen(out_path, "wb")))
{
fprintf(stderr, "could not open %s: %s\n", out_path, strerror(errno));
goto end;
}
else if (!(in = fopen(in_path, "rb")))
{
fprintf(stderr, "could not open %s: %s\n", in_path, strerror(errno));
goto end;
}
for (int i = 1; i < argc - 2; i++)
{
if (fprintf(out, "%s", argv[i]) < 0
|| putc('\0', out) == EOF
|| ferror(out))
{
fprintf(stderr, "failed writing to %s\n", out_path);
goto end;
}
}
while (!feof(in))
{
char c;
if ((!fread(&c, sizeof c, 1, in)
|| !fwrite(&c, sizeof c, 1, out))
&& (ferror(in) || ferror(out)))
{
fprintf(stderr, "ferror(%s)=%d, ferror(%s)=%d\n",
in_path, ferror(in), out_path, ferror(out));
goto end;
}
}
ret = EXIT_SUCCESS;
end:
if (out)
fclose(out);
if (in)
fclose(in);
return ret;
}
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