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sortix--sortix/libmaxsi/fwrite.cpp
2012-07-31 14:35:54 +02:00

64 lines
1.8 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
This file is part of LibMaxsi.
LibMaxsi is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
details.
You should have received a copy of the GNU Lesser General Public License
along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
fwrote.cpp
Writes data to a FILE.
*******************************************************************************/
#include <stdio.h>
#include <errno.h>
extern "C" size_t fwrite(const void* ptr, size_t size, size_t nmemb, FILE* fp)
{
if ( !fp->write_func ) { errno = EBADF; return 0; }
fp->flags &= ~_FILE_LAST_READ; fp->flags |= _FILE_LAST_WRITE;
char* str = (char*) ptr;
size_t total = size * nmemb;
size_t sofar = 0;
while ( sofar < total )
{
size_t left = total - sofar;
if ( (!fp->bufferused && fp->buffersize <= left) ||
(fp->flags & _FILE_NO_BUFFER) )
{
return sofar + fp->write_func(str + sofar, 1, left, fp->user);
}
size_t available = fp->buffersize - fp->bufferused;
size_t count = ( left < available ) ? left : available;
count = left;
for ( size_t i = 0; i < count; i++ )
{
char c = str[sofar++];
fp->buffer[fp->bufferused++] = c;
if ( c == '\n' )
{
if ( fflush(fp) ) { return sofar; }
break;
}
}
if ( fp->buffersize <= fp->bufferused )
{
if ( fflush(fp) ) { return sofar; }
}
}
return sofar;
}