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The advantage is that the buffer will always contain the number
of characters as returned from the function, which allows one to use
a sequence like
/* No more audit module output. */
line_length = xgetline (&buffer, &buffer_length, fp);
TEST_COMPARE_BLOB ("", 0, buffer, line_length);
to check for an expected EOF, while also reporting any unexpected
extra data encountered.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
38 lines
1.3 KiB
C
38 lines
1.3 KiB
C
/* Error-checking wrappers for stdio functions.
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Copyright (C) 2016-2020 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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#ifndef SUPPORT_XSTDIO_H
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#define SUPPORT_XSTDIO_H
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#include <stdio.h>
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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FILE *xfopen (const char *path, const char *mode);
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void xfclose (FILE *);
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/* Read a line from FP, using getline. *BUFFER must be NULL, or a
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heap-allocated pointer of *LENGTH bytes. Return the number of
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bytes in the line if a line was read, or 0 on EOF. */
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size_t xgetline (char **lineptr, size_t *n, FILE *stream);
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__END_DECLS
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#endif /* SUPPORT_XSTDIO_H */
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