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