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/* fwrite( const void *, size_t, size_t, FILE * )
This file is part of the Public Domain C Library (PDCLib).
Permission is granted to use, modify, and / or redistribute at will.
*/
#include <stdio.h>
#include <string.h>
#ifndef REGTEST
#include "pdclib/_PDCLIB_glue.h"
#ifndef __STDC_NO_THREADS__
#include <threads.h>
#endif
size_t fwrite( const void * _PDCLIB_restrict ptr, size_t size, size_t nmemb, struct _PDCLIB_file_t * _PDCLIB_restrict stream )
{
_PDCLIB_size_t offset = 0;
/* TODO: lineend */
/* int lineend = 0; */
size_t nmemb_i;
_PDCLIB_LOCK( stream->mtx );
if ( _PDCLIB_prepwrite( stream ) == EOF )
{
_PDCLIB_UNLOCK( stream->mtx );
return 0;
}
for ( nmemb_i = 0; nmemb_i < nmemb; ++nmemb_i )
{
size_t size_i;
for ( size_i = 0; size_i < size; ++size_i )
{
if ( ( stream->buffer[ stream->bufidx++ ] = ( ( char * )ptr )[ nmemb_i * size + size_i ] ) == '\n' )
{
/* Remember last newline, in case we have to do a partial line-buffered flush */
offset = stream->bufidx;
/* lineend = true; */
}
if ( stream->bufidx == stream->bufsize )
{
if ( _PDCLIB_flushbuffer( stream ) == EOF )
{
/* Returning number of objects completely buffered */
_PDCLIB_UNLOCK( stream->mtx );
return nmemb_i;
}
offset = 0;
/* lineend = false; */
}
}
}
/* Fully-buffered streams are OK. Non-buffered streams must be flushed,
line-buffered streams only if there's a newline in the buffer.
*/
switch ( stream->status & ( _IONBF | _IOLBF ) )
{
case _IONBF:
if ( _PDCLIB_flushbuffer( stream ) == EOF )
{
/* We are in a pinch here. We have an error, which requires a
return value < nmemb. On the other hand, all objects have
been written to buffer, which means all the caller had to
do was removing the error cause, and re-flush the stream...
Catch 22. We'll return a value one short, to indicate the
error, and can't really do anything about the inconsistency.
*/
_PDCLIB_UNLOCK( stream->mtx );
return nmemb_i - 1;
}
break;
case _IOLBF:
if ( offset > 0 )
{
size_t bufidx = stream->bufidx;
stream->bufidx = offset;
if ( _PDCLIB_flushbuffer( stream ) == EOF )
{
/* See comment above. */
stream->bufidx = bufidx;
_PDCLIB_UNLOCK( stream->mtx );
return nmemb_i - 1;
}
stream->bufidx = bufidx - offset;
memmove( stream->buffer, stream->buffer + offset, stream->bufidx );
}
}
_PDCLIB_UNLOCK( stream->mtx );
return nmemb_i;
}
#endif
#ifdef TEST
#include "_PDCLIB_test.h"
int main( void )
{
/* Testing covered by fread(). */
return TEST_RESULTS;
}
#endif
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