new version also compiles with WEGA

WEGA/contrib/crc.c

@@ -22,21 +22,29 @@
  * (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 1.2 2007/04/16 04:12:11 olivleh1 Exp $
+ * $Id: crc.c,v 1.3 2007/04/16 17:20:32 olivleh1 Exp $
  */
 
 #include <stdio.h>
 
-static void usage(char *);
+#ifndef SEEK_SET
+#define SEEK_SET 0
+#endif
 
-int main(int argc, char **argv) {
+static void usage();
+
+main(argc, argv)
+char **argv;
+{
 	char d,e,a1,a2;
-	int i,begin=0,end=-1,c;
-	FILE *f;
+	int i,c = 0;
+	int begin = 0;
+	int end = -1;
+	int f;
 	char *filename;
 
 	if(argc < 2 || argc > 4 )
-		usage(argv[0]);
+		usage(argv[1]);
 		
 	filename = argv[1];
 	
@@ -48,33 +56,23 @@ int main(int argc, char **argv) {
     
 	if( end != -1 && begin > end ) {
 		fprintf(stderr, "begin adress cannot be higher than end adress\n");
-		usage(argv[0]);
+		usage(argv[1]);
 	}
 
-	if( ! ( f = fopen(filename, "rb") ) ) {
+	f = open(filename, 0);
+	if (f<0) {
 		fprintf(stderr, "cannot open %s \n", filename);
-		usage(argv[0]);
+		usage(argv[1]);
 	}
 
-	fseek(f,begin,SEEK_SET);
-
 	d=0xff; e=0xff;
 
-	c=begin;
+	while( read(f, &a1, sizeof(a1)) ) {
+		if( c == end )
+			break;
+
+		if( c >= begin ) {
 
-	while(!feof(f)) {
-		if( end != -1 && c == end )
-			break;
-		else
-			c++;
-		a1 = fgetc(f);
-		if( ferror(f) ) {
-			printf("File error\n");
-			break;
-		}
-		if( feof(f) ) {
-			break;
-		}
 			a1=a1 ^ d;
 			d=a1;
 			for (i=0;i<4;i++)
@@ -101,14 +99,19 @@ int main(int argc, char **argv) {
 			a1=a1 ^ d;
 			d=e;
 			e=a1;
+			a1=0xff;
 		}
-	fclose(f);
+		c++;
+	} 
+	close(f);
 	printf ("%s %02x%02x\n","crc_checksum:",d & 0xff,e & 0xff);
 
 	return 0;
 }
 
-static void usage(char *progname) {
+static void usage(progname)
+char *progname;
+{
 	printf("usage: %s file [start adress] [end adress]\n", progname);
 	exit(1);
 }