--- ray/src/cal/lam.c	2014/02/11 17:05:00	1.13
+++ ray/src/cal/lam.c	2016/03/24 19:00:54	1.16
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: lam.c,v 1.13 2014/02/11 17:05:00 greg Exp $";
+static const char	RCSid[] = "$Id: lam.c,v 1.16 2016/03/24 19:00:54 greg Exp $";
 #endif
 /*
  *  lam.c - simple program to laminate files.
@@ -19,6 +19,8 @@ static const char	RCSid[] = "$Id: lam.c,v 1.13 2014/02
 
 #define MAXLINE		65536		/* maximum input line */
 
+long	incnt = 0;			/* limit number of records? */
+
 FILE	*input[MAXFILE];
 int	bytsiz[MAXFILE];
 char	*tabc[MAXFILE];
@@ -32,6 +34,7 @@ int	argc;
 char	*argv[];
 {
 	int	unbuff = 0;
+	int	binout = 0;
 	int	i;
 	char	*curtab;
 	int	curbytes;
@@ -51,6 +54,9 @@ char	*argv[];
 				break;
 			case 'i':
 				switch (argv[i][2]) {
+				case 'n':
+					incnt = atol(argv[++i]);
+					break;
 				case 'f':
 					curbytes = sizeof(float);
 					break;
@@ -79,8 +85,10 @@ char	*argv[];
 					fputs(": input size too big\n", stderr);
 					exit(1);
 				}
-				if (curbytes)
+				if (curbytes) {
 					curtab = "";
+					++binout;
+				}
 				break;
 			case '\0':
 				tabc[nfiles] = curtab;
@@ -128,13 +136,20 @@ char	*argv[];
 			exit(1);
 		}
 	}
-	puteol = 0;				/* check for ASCII output */
+	if (binout)				/* binary output? */
+		SET_FILE_BINARY(stdout);
+#ifdef getc_unlocked				/* avoid lock/unlock overhead */
 	for (i = nfiles; i--; )
+		flockfile(input[i]);
+	flockfile(stdout);
+#endif
+	puteol = 0;				/* any ASCII output at all? */
+	for (i = nfiles; i--; )
 		if (!bytsiz[i] || isprint(tabc[i][0]) || tabc[i][0] == '\t') {
 			puteol++;
 			break;
 		}
-	for ( ; ; ) {				/* main loop */
+	do {					/* main loop */
 		for (i = 0; i < nfiles; i++) {
 			if (bytsiz[i]) {		/* binary file */
 				if (fread(buf, bytsiz[i], 1, input[i]) < 1)
@@ -157,6 +172,6 @@ char	*argv[];
 			putchar('\n');
 		if (unbuff)
 			fflush(stdout);
-	}
+	} while (--incnt);
 	return(0);
 }