1 files changed, 141 insertions, 0 deletions
diff --git a/usr.bin/unexpand/unexpand.c b/usr.bin/unexpand/unexpand.c
new file mode 100644
index 00000000000..681aaf235f1
--- /dev/null
+++ b/usr.bin/unexpand/unexpand.c
@@ -0,0 +1,141 @@
+/*	$NetBSD: unexpand.c,v 1.5 1994/12/24 17:08:05 cgd Exp $	*/
+
+/*-
+ * Copyright (c) 1980, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char copyright[] =
+"@(#) Copyright (c) 1980, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)unexpand.c	8.1 (Berkeley) 6/6/93";
+#endif
+static char rcsid[] = "$NetBSD: unexpand.c,v 1.5 1994/12/24 17:08:05 cgd Exp $";
+#endif /* not lint */
+
+/*
+ * unexpand - put tabs into a file replacing blanks
+ */
+#include <stdio.h>
+#include <string.h>
+
+char	genbuf[BUFSIZ];
+char	linebuf[BUFSIZ];
+int	all;
+
+void tabify __P((char));
+
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	register char *cp;
+
+	argc--, argv++;
+	if (argc > 0 && argv[0][0] == '-') {
+		if (strcmp(argv[0], "-a") != 0) {
+			fprintf(stderr, "usage: unexpand [ -a ] file ...\n");
+			exit(1);
+		}
+		all++;
+		argc--, argv++;
+	}
+	do {
+		if (argc > 0) {
+			if (freopen(argv[0], "r", stdin) == NULL) {
+				perror(argv[0]);
+				exit(1);
+			}
+			argc--, argv++;
+		}
+		while (fgets(genbuf, BUFSIZ, stdin) != NULL) {
+			for (cp = linebuf; *cp; cp++)
+				continue;
+			if (cp > linebuf)
+				cp[-1] = 0;
+			tabify(all);
+			printf("%s", linebuf);
+		}
+	} while (argc > 0);
+	exit(0);
+}
+
+void
+tabify(c)
+	char c;
+{
+	register char *cp, *dp;
+	register int dcol;
+	int ocol;
+
+	ocol = 0;
+	dcol = 0;
+	cp = genbuf, dp = linebuf;
+	for (;;) {
+		switch (*cp) {
+
+		case ' ':
+			dcol++;
+			break;
+
+		case '\t':
+			dcol += 8;
+			dcol &= ~07;
+			break;
+
+		default:
+			while (((ocol + 8) &~ 07) <= dcol) {
+				if (ocol + 1 == dcol)
+					break;
+				*dp++ = '\t';
+				ocol += 8;
+				ocol &= ~07;
+			}
+			while (ocol < dcol) {
+				*dp++ = ' ';
+				ocol++;
+			}
+			if (*cp == 0 || c == 0) {
+				strcpy(dp, cp);
+				return;
+			}
+			*dp++ = *cp;
+			ocol++, dcol++;
+		}
+		cp++;
+	}
+}