68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/*
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* Copyright (c) 2012, 2013, 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* stdio/fflush_stop_writing_unlocked.c
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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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#include <sys/types.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdint.h>
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#include <stdio.h>
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int fflush_stop_writing_unlocked(FILE* fp)
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{
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if ( !(fp->flags & _FILE_LAST_WRITE) )
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return 0;
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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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if ( !fp->write_func )
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return errno = EBADF, fp->flags |= _FILE_STATUS_ERROR, EOF;
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int result = 0;
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size_t count = fp->amount_output_buffered;
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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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fp->amount_output_buffered = 0;
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fp->flags &= ~_FILE_LAST_WRITE;
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return result;
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}
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