72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
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/*
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* mapper.c -- simple file that mmap()s a file region and prints it
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*
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* Copyright (C) 1998,2000,2001 Alessandro Rubini
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <errno.h>
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#include <limits.h>
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int main(int argc, char **argv)
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{
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char *fname;
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FILE *f;
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unsigned long offset, len;
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void *address;
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if (argc !=4
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|| sscanf(argv[2],"%li", &offset) != 1
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|| sscanf(argv[3],"%li", &len) != 1) {
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fprintf(stderr, "%s: Usage \"%s <file> <offset> <len>\"\n", argv[0],
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argv[0]);
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exit(1);
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}
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/* the offset might be big (e.g., PCI devices), but conversion trims it */
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if (offset == INT_MAX) {
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if (argv[2][1]=='x')
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sscanf(argv[2]+2, "%lx", &offset);
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else
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sscanf(argv[2], "%lu", &offset);
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}
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fname=argv[1];
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if (!(f=fopen(fname,"r"))) {
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fprintf(stderr, "%s: %s: %s\n", argv[0], fname, strerror(errno));
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exit(1);
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}
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address=mmap(0, len, PROT_READ, MAP_FILE | MAP_PRIVATE, fileno(f), offset);
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if (address == (void *)-1) {
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fprintf(stderr,"%s: mmap(): %s\n",argv[0],strerror(errno));
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exit(1);
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}
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fclose(f);
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fprintf(stderr, "mapped \"%s\" from %lu (0x%08lx) to %lu (0x%08lx)\n",
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fname, offset, offset, offset+len, offset+len);
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fwrite(address, 1, len, stdout);
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return 0;
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}
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