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sortix--sortix/libc/fread.cpp
2012-12-14 14:13:36 +01:00

45 lines
1.6 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>
#include <errno.h>
extern "C" size_t fread(void* ptr, size_t size, size_t nmemb, FILE* fp)
{
if ( fp->numpushedback && size != 1 ) { errno = ENOSYS; return 0; }
if ( fp->numpushedback && nmemb )
{
unsigned char* buf = (unsigned char*) ptr;
size_t amount = nmemb < fp->numpushedback ? nmemb : fp->numpushedback;
for ( size_t i = 0; i < amount; i++ )
{
buf[i] = fp->pushedback[--(fp->numpushedback)];
}
if ( nmemb <= amount ) { return nmemb; }
return amount + fread(buf + amount, size, nmemb - amount, fp);
}
if ( !fp->read_func ) { errno = EBADF; return 0; }
fp->flags &= ~_FILE_LAST_WRITE; fp->flags |= _FILE_LAST_READ;
return fp->read_func(ptr, size, nmemb, fp->user);
}