2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/boot/common/load.c,v 1.3 2003/08/25 23:30:41 obrien Exp $
27 * $DragonFly: src/sys/boot/common/load.c,v 1.3 2003/11/10 06:08:31 dillon Exp $
31 #define LOAD_TINYBUF 2048
34 * Attempt to load the file at (path) into an allocated
35 * area on the heap, return a pointer to it or NULL
38 * Because in many cases it is impossible to determine the
39 * true size of a file without reading it, we do just that.
42 filedup(const char *path, int flags)
48 if ((fd = open(path, F_READ | flags)) == -1)
51 printf("%s open, flags 0x%x\n", path, files[fd].f_flags);
52 buf = alloc(LOAD_TINYBUF);
54 /* Read the first buffer-full */
55 size = read(fd, buf, LOAD_TINYBUF);
57 free(buf, LOAD_TINYBUF);
61 /* If it all fitted, then just return the buffer straight out */
62 if (size < LOAD_TINYBUF) {
68 printf("tinybuf loaded, size %d\n", size);
72 /* Read everything until we know how big it is */
74 result = read(fd, buf, LOAD_TINYBUF);
76 free(buf, LOAD_TINYBUF);
85 /* discard the old buffer, close the file */
86 free(buf, LOAD_TINYBUF);
89 /* reopen the file, realloc the buffer */
90 if ((fd = open(path, F_READ | flags)) == -1)
93 result = read(fd, buf, size);