86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2011 Thomas Martitz
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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/* A simple replacement program for (
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* dd if=$file1 of=$file2 bs=1 skip=$offset count=$size
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*
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* Written because byte-size operations with dd are unbearably slow.
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*/
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void usage(void)
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{
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fprintf(stderr, "Usage: extract_section <romfile> <outfile> <offset> <byte count>\n");
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exit(1);
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}
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void die(const char* fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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exit(1);
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}
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int main(int argc, const char* argv[])
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{
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if (argc != 5)
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usage();
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int ifd, ofd;
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ssize_t size = atol(argv[4]);
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long skip = atol(argv[3]);
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if (!size)
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die("invalid byte count\n");
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ifd = open(argv[1], O_RDONLY);
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if (ifd < 0)
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die("Could not open %s for reading!\n", argv[1]);
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ofd = open(argv[2], O_WRONLY|O_CREAT|O_TRUNC, 0666);
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if (ofd < 0)
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die("Could not create %s\n", argv[2]);
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void *buf = malloc(size);
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if (!buf) die("OOM\n");
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lseek(ifd, skip, SEEK_SET);
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lseek(ofd, 0, SEEK_SET);
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if (read(ifd, buf, size) != size)
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die("Read failed\n");
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if (write(ofd, buf, size) != size)
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die("write failed\n");
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close(ifd);
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close(ofd);
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exit(EXIT_SUCCESS);
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}
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