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/* @(#)fileread.c 1.12 01/02/17 Copyright 1986 J. Schilling */
/*
* Copyright (c) 1986 J. Schilling
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "io.h"
static char _readerr[] = "file_read_err";
#ifdef HAVE_USG_STDIO
EXPORT int
fileread(f, buf, len)
register FILE *f;
void *buf;
int len;
{
int cnt;
register int n;
down2(f, _IOREAD, _IORW);
if (f->_flag & _IONBF){
cnt = _niread (fileno(f), buf, len);
if (cnt < 0) {
f->_flag |= _IOERR;
if (!(my_flag(f) & _IONORAISE))
raisecond(_readerr, 0L);
}
if (cnt == 0 && len)
f->_flag |= _IOEOF;
return cnt;
}
cnt = 0;
while (len > 0) {
if (f->_cnt <= 0){
if (usg_filbuf(f) == EOF)
break;
f->_cnt++;
f->_ptr--;
}
n = f->_cnt >= len ? len : f->_cnt;
buf = (void *)movebytes (f->_ptr, buf, n);
f->_ptr += n;
f->_cnt -= n;
cnt += n;
len -= n;
}
if (!ferror(f))
return cnt;
if (!(my_flag(f) & _IONORAISE))
raisecond(_readerr, 0L);
return -1;
}
#else
EXPORT int
fileread(f, buf, len)
register FILE *f;
void *buf;
int len;
{
int cnt;
down2(f, _IOREAD, _IORW);
if (my_flag(f) & _IOUNBUF)
return _niread(fileno(f), buf, len);
cnt = fread(buf, 1, len, f);
if (!ferror(f))
return cnt;
if (!(my_flag(f) & _IONORAISE))
raisecond(_readerr, 0L);
return -1;
}
#endif /* HAVE_USG_STDIO */
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