initial population

1 files changed, 182 insertions, 0 deletions

diff --git a/usr.bin/expand/expand.c b/usr.bin/expand/expand.c
new file mode 100644
index 0000000..c69fda1
--- /dev/null
+++ b/usr.bin/expand/expand.c
@@ -0,0 +1,182 @@
+/*	$NetBSD: expand.c,v 1.14 2016/09/05 00:40:28 sevan 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. 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.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+__COPYRIGHT("@(#) Copyright (c) 1980, 1993\
+ The Regents of the University of California.  All rights reserved.");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)expand.c	8.1 (Berkeley) 6/9/93";
+#endif
+__RCSID("$NetBSD: expand.c,v 1.14 2016/09/05 00:40:28 sevan Exp $");
+#endif /* not lint */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <err.h>
+
+/*
+ * expand - expand tabs to equivalent spaces
+ */
+size_t	nstops;
+size_t	tabstops[100];
+
+static	void	getstops(const char *);
+static	void	usage(void) __dead;
+
+int
+main(int argc, char *argv[])
+{
+	int c;
+	size_t n, column;
+
+	setprogname(argv[0]);
+
+	/* handle obsolete syntax */
+	while (argc > 1 &&
+	    argv[1][0] == '-' && isdigit((unsigned char)argv[1][1])) {
+		getstops(&argv[1][1]);
+		argc--; argv++;
+	}
+
+	while ((c = getopt (argc, argv, "t:")) != -1) {
+		switch (c) {
+		case 't':
+			getstops(optarg);
+			break;
+		case '?':
+		default:
+			usage();
+			/* NOTREACHED */
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	do {
+		if (argc > 0) {
+			if (freopen(argv[0], "r", stdin) == NULL)
+				err(EXIT_FAILURE, "Cannot open `%s'", argv[0]);
+			argc--, argv++;
+		}
+		column = 0;
+		while ((c = getchar()) != EOF) {
+			switch (c) {
+			case '\t':
+				if (nstops == 0) {
+					do {
+						putchar(' ');
+						column++;
+					} while (column & 07);
+					continue;
+				}
+				if (nstops == 1) {
+					do {
+						putchar(' ');
+						column++;
+					} while (((column - 1) % tabstops[0])
+					    != (tabstops[0] - 1));
+					continue;
+				}
+				for (n = 0; n < nstops; n++)
+					if (tabstops[n] > column)
+						break;
+				if (n == nstops) {
+					putchar(' ');
+					column++;
+					continue;
+				}
+				while (column < tabstops[n]) {
+					putchar(' ');
+					column++;
+				}
+				continue;
+
+			case '\b':
+				if (column)
+					column--;
+				putchar('\b');
+				continue;
+
+			default:
+				putchar(c);
+				column++;
+				continue;
+
+			case '\n':
+				putchar(c);
+				column = 0;
+				continue;
+			}
+		}
+	} while (argc > 0);
+	return EXIT_SUCCESS;
+}
+
+static void
+getstops(const char *spec)
+{
+	int i;
+	const char *cp = spec;
+
+	nstops = 0;
+	for (;;) {
+		i = 0;
+		while (*cp >= '0' && *cp <= '9')
+			i = i * 10 + *cp++ - '0';
+		if (i <= 0 || i > 256)
+			errx(EXIT_FAILURE, "Too large tab stop spec `%d'", i);
+		if (nstops > 0 && (size_t)i <= tabstops[nstops-1])
+			errx(EXIT_FAILURE, "Out of order tabstop spec `%d'", i);
+		if (nstops == sizeof(tabstops) / sizeof(tabstops[0]) - 1)
+			errx(EXIT_FAILURE, "Too many tabstops");
+		tabstops[nstops++] = i;
+		if (*cp == '\0')
+			break;
+		if (*cp != ',' && *cp != ' ')
+			errx(EXIT_FAILURE, "Illegal tab stop spec `%s'", spec);
+		cp++;
+	}
+}
+
+static void
+usage(void)
+{
+
+	(void)fprintf(stderr, "Usage: %s [-t tablist] [file ...]\n",
+	    getprogname());
+	exit(EXIT_FAILURE);
+}