81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/*
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* $NetBSD: pread.c,v 1.2 1997/03/22 01:48:38 thorpej Exp $
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*/
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/*-
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* Copyright (c) 1996
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* Matthias Drochner. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project
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* by Matthias Drochner.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/* read into destination in flat addr space */
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#include <stand.h>
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#include "libi386.h"
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#ifdef SAVE_MEMORY
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#define BUFSIZE (1*1024)
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#else
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#define BUFSIZE (4*1024)
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#endif
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static char buf[BUFSIZE];
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int
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pread(fd, dest, size)
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int fd;
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vm_offset_t dest;
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int size;
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{
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int rsize;
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rsize = size;
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while (rsize > 0) {
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int count, got;
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count = (rsize < BUFSIZE ? rsize : BUFSIZE);
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got = read(fd, buf, count);
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if (got < 0)
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return (-1);
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/* put to physical space */
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vpbcopy(buf, dest, got);
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dest += got;
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rsize -= got;
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if (got < count)
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break; /* EOF */
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}
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return (size - rsize);
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}
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