projects / dragonfly.git / blame
| Commit | Line | Data |
|---|---|---|
| 984263bc | 1 | /* |
| 5ee58eed | 2 | * $NetBSD: pread.c,v 1.2 1997/03/22 01:48:38 thorpej Exp $ |
| 984263bc MD |
3 | */ |
| 4 | ||
| 5ee58eed | 5 | /*- |
| 984263bc MD |
6 | * Copyright (c) 1996 |
| 7 | * Matthias Drochner. All rights reserved. | |
| 8 | * | |
| 9 | * Redistribution and use in source and binary forms, with or without | |
| 10 | * modification, are permitted provided that the following conditions | |
| 11 | * are met: | |
| 12 | * 1. Redistributions of source code must retain the above copyright | |
| 13 | * notice, this list of conditions and the following disclaimer. | |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 15 | * notice, this list of conditions and the following disclaimer in the | |
| 16 | * documentation and/or other materials provided with the distribution. | |
| 17 | * 3. All advertising materials mentioning features or use of this software | |
| 18 | * must display the following acknowledgement: | |
| 19 | * This product includes software developed for the NetBSD Project | |
| 20 | * by Matthias Drochner. | |
| 21 | * 4. The name of the author may not be used to endorse or promote products | |
| 22 | * derived from this software without specific prior written permission. | |
| 23 | * | |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
| 25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
| 26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
| 27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
| 28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
| 29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
| 33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 34 | * | |
| 5ee58eed MD |
35 | * $FreeBSD: src/sys/boot/i386/libi386/pread.c,v 1.3 2003/08/25 23:28:31 obrien Exp $ |
| 36 | * $DragonFly: src/sys/boot/pc32/libi386/pread.c,v 1.3 2003/11/10 06:08:36 dillon Exp $ | |
| 984263bc MD |
37 | */ |
| 38 | ||
| 39 | /* read into destination in flat addr space */ | |
| 40 | ||
| 41 | #include <stand.h> | |
| 42 | ||
| 43 | #include "libi386.h" | |
| 44 | ||
| 45 | #ifdef SAVE_MEMORY | |
| 46 | #define BUFSIZE (1*1024) | |
| 47 | #else | |
| 48 | #define BUFSIZE (4*1024) | |
| 49 | #endif | |
| 50 | ||
| 51 | static char buf[BUFSIZE]; | |
| 52 | ||
| 53 | int | |
| 54 | pread(fd, dest, size) | |
| 55 | int fd; | |
| 56 | vm_offset_t dest; | |
| 57 | int size; | |
| 58 | { | |
| 59 | int rsize; | |
| 60 | ||
| 61 | rsize = size; | |
| 62 | while (rsize > 0) { | |
| 63 | int count, got; | |
| 64 | ||
| 65 | count = (rsize < BUFSIZE ? rsize : BUFSIZE); | |
| 66 | ||
| 67 | got = read(fd, buf, count); | |
| 68 | if (got < 0) | |
| 69 | return (-1); | |
| 70 | ||
| 71 | /* put to physical space */ | |
| 72 | vpbcopy(buf, dest, got); | |
| 73 | ||
| 74 | dest += got; | |
| 75 | rsize -= got; | |
| 76 | if (got < count) | |
| 77 | break; /* EOF */ | |
| 78 | } | |
| 79 | return (size - rsize); | |
| 80 | } |