2013-08-31 23:42:02 +00:00
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/*******************************************************************************
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2014-02-27 19:57:14 +00:00
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Copyright(C) Jonas 'Sortie' Termansen 2012, 2013, 2014.
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2013-08-31 23:42:02 +00:00
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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2016-02-28 11:11:02 +00:00
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stdio/fflush_stop_writing_unlocked.c
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2013-08-31 23:42:02 +00:00
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Resets the FILE to a consistent state so it is ready for reading.
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*******************************************************************************/
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2014-06-01 19:10:50 +00:00
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#include <sys/types.h>
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2013-08-31 23:42:02 +00:00
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#include <errno.h>
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2014-06-01 19:10:50 +00:00
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#include <limits.h>
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2014-02-27 19:57:14 +00:00
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#include <stdint.h>
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2013-08-31 23:42:02 +00:00
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#include <stdio.h>
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2016-02-28 11:11:02 +00:00
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int fflush_stop_writing_unlocked(FILE* fp)
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2013-08-31 23:42:02 +00:00
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{
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if ( !(fp->flags & _FILE_LAST_WRITE) )
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return 0;
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2014-02-27 19:57:14 +00:00
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if ( !(fp->flags & _FILE_WRITABLE) )
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return errno = EBADF, fp->flags |= _FILE_STATUS_ERROR, EOF;
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2013-08-31 23:42:02 +00:00
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if ( !fp->write_func )
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2014-02-27 19:57:14 +00:00
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return errno = EBADF, fp->flags |= _FILE_STATUS_ERROR, EOF;
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int result = 0;
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2013-08-31 23:42:02 +00:00
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size_t count = fp->amount_output_buffered;
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2014-02-27 19:57:14 +00:00
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size_t sofar = 0;
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while ( sofar < count )
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{
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size_t request = count - sofar;
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if ( (size_t) SSIZE_MAX < request )
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request = SSIZE_MAX;
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ssize_t amount = fp->write_func(fp->user, fp->buffer + sofar, request);
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if ( amount < 0 )
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{
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fp->flags |= _FILE_STATUS_ERROR;
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result = EOF;
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break;
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}
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if ( amount == 0 )
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{
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fp->flags |= _FILE_STATUS_EOF;
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result = EOF;
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break;
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}
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sofar += amount;
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}
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2013-08-31 23:42:02 +00:00
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fp->amount_output_buffered = 0;
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fp->flags &= ~_FILE_LAST_WRITE;
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2014-02-27 19:57:14 +00:00
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return result;
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2013-08-31 23:42:02 +00:00
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}
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