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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /scripts/binoffset.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'scripts/binoffset.c')
-rw-r--r--scripts/binoffset.c163
1 files changed, 163 insertions, 0 deletions
diff --git a/scripts/binoffset.c b/scripts/binoffset.c
new file mode 100644
index 000000000000..591309d85518
--- /dev/null
+++ b/scripts/binoffset.c
@@ -0,0 +1,163 @@
+/***************************************************************************
+ * binoffset.c
+ * (C) 2002 Randy Dunlap <rddunlap@osdl.org>
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+# binoffset.c:
+# - searches a (binary) file for a specified (binary) pattern
+# - returns the offset of the located pattern or ~0 if not found
+# - exits with exit status 0 normally or non-0 if pattern is not found
+# or any other error occurs.
+
+****************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+
+#define VERSION "0.1"
+#define BUF_SIZE (16 * 1024)
+#define PAT_SIZE 100
+
+char *progname;
+char *inputname;
+int inputfd;
+unsigned int bix; /* buf index */
+unsigned char patterns [PAT_SIZE] = {0}; /* byte-sized pattern array */
+int pat_len; /* actual number of pattern bytes */
+unsigned char *madr; /* mmap address */
+size_t filesize;
+int num_matches = 0;
+off_t firstloc = 0;
+
+void usage (void)
+{
+ fprintf (stderr, "%s ver. %s\n", progname, VERSION);
+ fprintf (stderr, "usage: %s filename pattern_bytes\n",
+ progname);
+ fprintf (stderr, " [prints location of pattern_bytes in file]\n");
+ exit (1);
+}
+
+void get_pattern (int pat_count, char *pats [])
+{
+ int ix, err, tmp;
+
+#ifdef DEBUG
+ fprintf (stderr,"get_pattern: count = %d\n", pat_count);
+ for (ix = 0; ix < pat_count; ix++)
+ fprintf (stderr, " pat # %d: [%s]\n", ix, pats[ix]);
+#endif
+
+ for (ix = 0; ix < pat_count; ix++) {
+ tmp = 0;
+ err = sscanf (pats[ix], "%5i", &tmp);
+ if (err != 1 || tmp > 0xff) {
+ fprintf (stderr, "pattern or value error in pattern # %d [%s]\n",
+ ix, pats[ix]);
+ usage ();
+ }
+ patterns [ix] = tmp;
+ }
+ pat_len = pat_count;
+}
+
+void search_pattern (void)
+{
+ for (bix = 0; bix < filesize; bix++) {
+ if (madr[bix] == patterns[0]) {
+ if (memcmp (&madr[bix], patterns, pat_len) == 0) {
+ if (num_matches == 0)
+ firstloc = bix;
+ num_matches++;
+ }
+ }
+ }
+}
+
+#ifdef NOTDEF
+size_t get_filesize (int fd)
+{
+ off_t end_off = lseek (fd, 0, SEEK_END);
+ lseek (fd, 0, SEEK_SET);
+ return (size_t) end_off;
+}
+#endif
+
+size_t get_filesize (int fd)
+{
+ int err;
+ struct stat stat;
+
+ err = fstat (fd, &stat);
+ fprintf (stderr, "filesize: %ld\n", err < 0 ? (long)err : stat.st_size);
+ if (err < 0)
+ return err;
+ return (size_t) stat.st_size;
+}
+
+int main (int argc, char *argv [])
+{
+ progname = argv[0];
+
+ if (argc < 3)
+ usage ();
+
+ get_pattern (argc - 2, argv + 2);
+
+ inputname = argv[1];
+
+ inputfd = open (inputname, O_RDONLY);
+ if (inputfd == -1) {
+ fprintf (stderr, "%s: cannot open '%s'\n",
+ progname, inputname);
+ exit (3);
+ }
+
+ filesize = get_filesize (inputfd);
+
+ madr = mmap (0, filesize, PROT_READ, MAP_PRIVATE, inputfd, 0);
+ if (madr == MAP_FAILED) {
+ fprintf (stderr, "mmap error = %d\n", errno);
+ close (inputfd);
+ exit (4);
+ }
+
+ search_pattern ();
+
+ if (munmap (madr, filesize))
+ fprintf (stderr, "munmap error = %d\n", errno);
+
+ if (close (inputfd))
+ fprintf (stderr, "%s: error %d closing '%s'\n",
+ progname, errno, inputname);
+
+ fprintf (stderr, "number of pattern matches = %d\n", num_matches);
+ if (num_matches == 0)
+ firstloc = ~0;
+ printf ("%ld\n", firstloc);
+ fprintf (stderr, "%ld\n", firstloc);
+
+ exit (num_matches ? 0 : 2);
+}
+
+/* end binoffset.c */

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