From: Bill Joy <wnj@ucbvax.Berkeley.EDU>
Date: Wed, 9 May 1979 07:09:11 +0000 (-0800)
Subject: BSD 2 development
X-Git-Tag: BSD-2~98
X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/commitdiff_plain/9ae25d5f48582324fd99ee75b1c2077348e574a4

BSD 2 development
Work on file src/expand.c

Synthesized-from: 2bsd
---

diff --git a/src/expand.c b/src/expand.c
new file mode 100644
index 0000000000..f236ee5abb
--- /dev/null
+++ b/src/expand.c
@@ -0,0 +1,112 @@
+/* Copyright (c) 1979 Regents of the University of California */
+#include <stdio.h>
+/*
+ * expand - expand tabs to equivalent spaces
+ */
+char	obuf[BUFSIZ];
+int	nstops;
+int	tabstops[100];
+
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	register int c, column;
+	register int n;
+
+	setbuf(stdout, obuf);
+	argc--, argv++;
+	do {
+		while (argc > 0 && argv[0][0] == '-') {
+			getstops(argv[0]);
+			argc--, argv++;
+		}
+		if (argc > 0) {
+			if (freopen(argv[0], "r", stdin) == NULL) {
+				perror(argv[0]);
+				exit(1);
+			}
+			argc--, argv++;
+		}
+		column = 0;
+		for (;;) {
+			c = getc(stdin);
+			if (c == -1)
+				break;
+			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);
+	exit(0);
+}
+
+getstops(cp)
+	register char *cp;
+{
+	register int i;
+
+	nstops = 0;
+	cp++;
+	for (;;) {
+		i = 0;
+		while (*cp >= '0' && *cp <= '9')
+			i = i * 10 + *cp++ - '0';
+		if (i <= 0 || i > 256) {
+bad:
+			fprintf(stderr, "Bad tab stop spec\n");
+			exit(1);
+		}
+		if (nstops > 0 && i <= tabstops[nstops])
+			goto bad;
+		tabstops[nstops++] = i;
+		if (*cp == 0)
+			break;
+		if (*cp++ != ',')
+			goto bad;
+	}
+}