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O_BINARY added for MS/DOS systems

This commit is contained in:
Oliver Lehmann 2007-04-25 04:50:07 +00:00
parent 4826ec2472
commit 9a868fd69d
1 changed files with 13 additions and 12 deletions
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25
WEGA/contrib/crc.c
View File

@ -22,15 +22,12 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: crc.c,v 1.3 2007/04/16 17:20:32 olivleh1 Exp $
* $Id: crc.c,v 1.4 2007/04/25 04:50:07 olivleh1 Exp $
*/
#include <fcntl.h>
#include <stdio.h>
#ifndef SEEK_SET
#define SEEK_SET 0
#endif
static void usage();
main(argc, argv)
@ -45,21 +42,25 @@ char **argv;
if(argc < 2 || argc > 4 )
usage(argv[1]);
filename = argv[1];
if(argc > 2)
begin = atoi(argv[2]);
if(argc > 3)
end = atoi(argv[3]);
if( end != -1 && begin > end ) {
fprintf(stderr, "begin adress cannot be higher than end adress\n");
usage(argv[1]);
}
f = open(filename, 0);
#ifdef O_BINARY
f = open(filename, O_RDONLY|O_BINARY);
#else
f = open(filename, O_RDONLY);
#endif
if (f<0) {
fprintf(stderr, "cannot open %s \n", filename);
usage(argv[1]);
@ -89,7 +90,7 @@ char **argv;
a1=a1 ^ e;
e=a1;
a1=a2;
if ((a1 & 1)>0) {a1=a1 >> 1; a1=a1 | 0x80;}
if ((a1 & 1)>0) {a1=a1 >> 1; a1=a1 | 0x80;}
else {a1=a1 >> 1; a1=a1 & 0x7f;}
a1=a1 & 0xf0;
a1=a1 ^ e;
@ -102,7 +103,7 @@ char **argv;
a1=0xff;
}
c++;
}
}
close(f);
printf ("%s %02x%02x\n","crc_checksum:",d & 0xff,e & 0xff);