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sortix--sortix/libc/fread.cpp
2013-12-17 14:30:29 +01:00

57 lines
1.7 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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/>.
fread.cpp
Reads data from a FILE.
*******************************************************************************/
#include <stdio.h>
extern "C" size_t fread(void* ptr, size_t size, size_t nmemb, FILE* fp)
{
if ( fp->buffer_mode == _IONBF )
{
if ( !(fp->flags & _FILE_BUFFER_MODE_SET) )
if ( fsetdefaultbuf(fp) != 0 )
return EOF; // TODO: ferror doesn't report error!
if ( !fp->read_func )
return 0; // TODO: ferror doesn't report error!
if ( fp->flags & _FILE_LAST_WRITE )
fflush_stop_writing(fp);
fp->flags |= _FILE_LAST_READ;
return fp->read_func(ptr, size, nmemb, fp->user);
}
unsigned char* buf = (unsigned char*) ptr;
for ( size_t n = 0; n < nmemb; n++ )
{
size_t offset = n * size;
for ( size_t i = 0; i < size; i++ )
{
int c = fgetc(fp);
if ( c == EOF )
return n;
size_t index = i + offset;
buf[index] = c;
}
}
return nmemb;
}