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/* Compare bytes from an open file.
Copyright (C) 2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <support/file_contents.h>
/* Check that an already-open file has exactly the given bytes,
starting at the current offset. */
int
support_compare_file_bytes (FILE *fp, const char *contents, size_t length)
{
int c;
while (length > 0)
{
c = getc (fp);
if (c == EOF || (unsigned char) c != (unsigned char) contents[0])
return 1;
contents++;
length--;
}
c = getc (fp);
if (c != EOF || ferror (fp))
return 1;
return 0;
}
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