48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
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/* Retrieve information about a FILE stream.
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Copyright (C) 2007-2020 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <stddef.h>
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#include <stdio.h>
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/* Assuming the stream STREAM is open for reading:
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Return the number of bytes waiting in the input buffer of STREAM.
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This includes both the bytes that have been read from the underlying input
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source and the bytes that have been pushed back through 'ungetc'.
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If this number is 0 and the stream is not currently writing,
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fflush (STREAM) is known to be a no-op.
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STREAM must not be wide-character oriented. */
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#if HAVE___FREADAHEAD /* musl libc */
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# include <stdio_ext.h>
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# define freadahead(stream) __freadahead (stream)
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#else
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# ifdef __cplusplus
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extern "C" {
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# endif
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extern size_t freadahead (FILE *stream) _GL_ATTRIBUTE_PURE;
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# ifdef __cplusplus
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}
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# endif
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#endif
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