--- ray/src/px/oki20c.c	1992/01/29 15:18:20	2.3
+++ ray/src/px/oki20c.c	1992/04/18 09:10:53	2.6
@@ -49,6 +49,9 @@ char  *argv[];
 		dofilter++;
 		argv++; argc--;
 	}
+#ifdef _IOLBF
+	stdout->_flag &= ~_IOLBF;
+#endif
 	if (argc < 2)
 		status = printp(NULL) == -1;
 	else
@@ -68,14 +71,15 @@ char  *fname;
 	int  i;
 
 	if (dofilter) {
-		if (fname == NULL)
-			fname = "";
-		sprintf(buf, FILTER, fname);
+		if (fname == NULL) {
+			sprintf(buf, FILTER, "");
+			fname = "<stdin>";
+		} else
+			sprintf(buf, FILTER, fname);
 		if ((input = popen(buf, "r")) == NULL) {
 			fprintf(stderr, "Cannot execute: %s\n", buf);
 			return(-1);
 		}
-		fname = buf;
 	} else if (fname == NULL) {
 		input = stdin;
 		fname = "<stdin>";
@@ -101,9 +105,6 @@ char  *fname;
 	fputs("\0333\042", stdout);
 				/* clear line buffer */
 	clearlbuf();
-#ifdef _IOLBF
-	stdout->_flag &= ~_IOLBF;
-#endif
 				/* put out scanlines */
 	for (i = yres-1; i >= 0; i--) {
 		if (freadcolrs(scanline, xres, input) < 0) {
@@ -145,9 +146,15 @@ int  y;
 		fputs("\033\031", stdout);
 
 		for (j = 0; j < 3; j++) {
+			i = (NCOLS + len)/2;		/* center image */
 			fputs("\033%O", stdout);
-			putchar(len & 255);
-			putchar(len >> 8);
+			putchar(i & 255);
+			putchar(i >> 8);
+			while (i-- > len) {
+				putchar(0);
+				putchar(0);
+				putchar(0);
+			}
 			for (i = 0; i < len; i++) {
 				c = lpat[i][j] | colbit(scan[i],i,j);
 							/* repeat this row */