mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
|
|
|
|
This file is part of the Sortix C Library.
|
|
|
|
The Sortix C Library 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.
|
|
|
|
The Sortix C Library 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 the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
stdio/fwrite_unlocked.cpp
|
|
Writes data to a FILE.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <errno.h>
|
|
#include <limits.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
|
|
extern "C"
|
|
size_t fwrite_unlocked(const void* ptr,
|
|
size_t element_size,
|
|
size_t num_elements,
|
|
FILE* fp)
|
|
{
|
|
if ( !(fp->flags & _FILE_WRITABLE) )
|
|
return errno = EBADF, fp->flags |= _FILE_STATUS_ERROR, -1;
|
|
|
|
const unsigned char* buf = (const unsigned char*) ptr;
|
|
size_t count = element_size * num_elements;
|
|
|
|
if ( fp->buffer_mode == _IONBF )
|
|
{
|
|
if ( !(fp->flags & _FILE_BUFFER_MODE_SET) )
|
|
if ( fsetdefaultbuf_unlocked(fp) != 0 )
|
|
return EOF;
|
|
if ( !fp->write_func )
|
|
return errno = EBADF, fp->flags |= _FILE_STATUS_ERROR, 0;
|
|
if ( fp->flags & _FILE_LAST_READ )
|
|
fflush_stop_reading_unlocked(fp);
|
|
fp->flags |= _FILE_LAST_WRITE;
|
|
fp->flags &= ~_FILE_STATUS_EOF;
|
|
size_t sofar = 0;
|
|
while ( sofar < count )
|
|
{
|
|
size_t request = count - sofar;
|
|
if ( (size_t) SSIZE_MAX < request )
|
|
request = SSIZE_MAX;
|
|
ssize_t amount = fp->write_func(fp->user, buf + sofar, request);
|
|
if ( amount < 0 )
|
|
return fp->flags |= _FILE_STATUS_ERROR, sofar / num_elements;
|
|
if ( amount == 0 )
|
|
return fp->flags |= _FILE_STATUS_EOF, sofar / num_elements;
|
|
sofar += amount;
|
|
}
|
|
return sofar / element_size;
|
|
}
|
|
|
|
for ( size_t n = 0; n < num_elements; n++ )
|
|
{
|
|
size_t offset = n * element_size;
|
|
for ( size_t i = 0; i < element_size; i++ )
|
|
{
|
|
size_t index = offset + i;
|
|
if ( fputc_unlocked(buf[index], fp) == EOF )
|
|
return n;
|
|
}
|
|
}
|
|
|
|
return num_elements;
|
|
}
|