1 files changed, 129 insertions, 0 deletions
diff --git a/contrib/nvi/ex/ex_cd.c b/contrib/nvi/ex/ex_cd.c
new file mode 100644
index 0000000..3307c7b
--- /dev/null
+++ b/contrib/nvi/ex/ex_cd.c
@@ -0,0 +1,129 @@
+/*-
+ * Copyright (c) 1992, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ * Copyright (c) 1992, 1993, 1994, 1995, 1996
+ *	Keith Bostic.  All rights reserved.
+ *
+ * See the LICENSE file for redistribution information.
+ */
+
+#include "config.h"
+
+#ifndef lint
+static const char sccsid[] = "@(#)ex_cd.c	10.10 (Berkeley) 8/12/96";
+#endif /* not lint */
+
+#include <sys/param.h>
+#include <sys/queue.h>
+
+#include <bitstring.h>
+#include <errno.h>
+#include <limits.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "../common/common.h"
+
+/*
+ * ex_cd -- :cd[!] [directory]
+ *	Change directories.
+ *
+ * PUBLIC: int ex_cd __P((SCR *, EXCMD *));
+ */
+int
+ex_cd(sp, cmdp)
+	SCR *sp;
+	EXCMD *cmdp;
+{
+	struct passwd *pw;
+	ARGS *ap;
+	CHAR_T savech;
+	char *dir, *p, *t;	/* XXX: END OF THE STACK, DON'T TRUST GETCWD. */
+	char buf[MAXPATHLEN * 2];
+
+	/*
+	 * !!!
+	 * Historic practice is that the cd isn't attempted if the file has
+	 * been modified, unless its name begins with a leading '/' or the
+	 * force flag is set.
+	 */
+	if (F_ISSET(sp->ep, F_MODIFIED) &&
+	    !FL_ISSET(cmdp->iflags, E_C_FORCE) && sp->frp->name[0] != '/') {
+		msgq(sp, M_ERR,
+    "120|File modified since last complete write; write or use ! to override");
+		return (1);
+	}
+
+	switch (cmdp->argc) {
+	case 0:
+		/* If no argument, change to the user's home directory. */
+		if ((dir = getenv("HOME")) == NULL) {
+			if ((pw = getpwuid(getuid())) == NULL ||
+			    pw->pw_dir == NULL || pw->pw_dir[0] == '\0') {
+				msgq(sp, M_ERR,
+			   "121|Unable to find home directory location");
+				return (1);
+			}
+			dir = pw->pw_dir;
+		}
+		break;
+	case 1:
+		dir = cmdp->argv[0]->bp;
+		break;
+	default:
+		abort();
+	}
+
+	/*
+	 * Try the current directory first.  If this succeeds, don't display
+	 * a message, vi didn't historically, and it should be obvious to the
+	 * user where they are.
+	 */
+	if (!chdir(dir))
+		return (0);
+
+	/*
+	 * If moving to the user's home directory, or, the path begins with
+	 * "/", "./" or "../", it's the only place we try.
+	 */
+	if (cmdp->argc == 0 ||
+	    (ap = cmdp->argv[0])->bp[0] == '/' ||
+	    ap->len == 1 && ap->bp[0] == '.' ||
+	    ap->len >= 2 && ap->bp[0] == '.' && ap->bp[1] == '.' &&
+	    (ap->bp[2] == '/' || ap->bp[2] == '\0'))
+		goto err;
+
+	/* Try the O_CDPATH option values. */
+	for (p = t = O_STR(sp, O_CDPATH);; ++p)
+		if (*p == '\0' || *p == ':') {
+			/*
+			 * Empty strings specify ".".  The only way to get an
+			 * empty string is a leading colon, colons in a row,
+			 * or a trailing colon.  Or, to put it the other way,
+			 * if the length is 1 or less, then we're dealing with
+			 * ":XXX", "XXX::XXXX" , "XXX:", or "".  Since we've
+			 * already tried dot, we ignore tham all.
+			 */
+			if (t < p - 1) {
+				savech = *p;
+				*p = '\0';
+				(void)snprintf(buf,
+				    sizeof(buf), "%s/%s", t, dir);
+				*p = savech;
+				if (!chdir(buf)) {
+					if (getcwd(buf, sizeof(buf)) != NULL)
+		msgq_str(sp, M_INFO, buf, "122|New current directory: %s");
+					return (0);
+				}
+			}
+			t = p + 1;
+			if (*p == '\0')
+				break;
+		}
+
+err:	msgq_str(sp, M_SYSERR, dir, "%s");
+	return (1);
+}