From d7fdad4baaadb796547f330e9a668a1576c30db4 Mon Sep 17 00:00:00 2001
From: sheldonh <sheldonh@FreeBSD.org>
Date: Mon, 14 Aug 2000 08:48:55 +0000
Subject: Add the -i option, as found in rm(1), which provides an interactive
 mode in which the user is prompted for confirmation before an existing file
 is replaced.

Submitted by:	alex
---
 bin/ln/ln.1 | 20 +++++++++++++++++---
 bin/ln/ln.c | 34 +++++++++++++++++++++++++++++-----
 2 files changed, 46 insertions(+), 8 deletions(-)

(limited to 'bin/ln')

diff --git a/bin/ln/ln.1 b/bin/ln/ln.1
index 89f4e5f..6120ae57 100644
--- a/bin/ln/ln.1
+++ b/bin/ln/ln.1
@@ -44,11 +44,11 @@
 .Nd make links
 .Sh SYNOPSIS
 .Nm ln
-.Op Fl fsv
+.Op Fl fisv
 .Ar source_file
 .Op target_file
 .Nm ln
-.Op Fl fsv
+.Op Fl fisv
 .Ar source_file ...
 .Op target_dir
 .Nm link
@@ -73,6 +73,18 @@ The options are as follows:
 .Bl -tag -width flag
 .It Fl f
 Unlink any already existing file, permitting the link to occur.
+The
+.Fl f
+option overrides any previous
+.Fl i
+options.
+.It Fl i
+Request confirmation before attempting to replace already existing file.
+The
+.Fl i
+option overrides any previous
+.Fl f
+options.
 .It Fl s
 Create a symbolic link.
 .It Fl v
@@ -144,7 +156,9 @@ operation using the two passed arguments.
 .Sh COMPATIBILITY
 The 
 .Fl v
-option is non-standard and its use in scripts is not recommended.
+and
+.Fl i
+options are non-standard and their use in scripts is not recommended.
 .Sh HISTORY
 An
 .Nm
diff --git a/bin/ln/ln.c b/bin/ln/ln.c
index dc2db0f..9ec1efc 100644
--- a/bin/ln/ln.c
+++ b/bin/ln/ln.c
@@ -56,6 +56,7 @@ static const char rcsid[] =
 #include <unistd.h>
 
 int	fflag;				/* Unlink existing files. */
+int	iflag;				/* Interactive mode. */
 int	sflag;				/* Symbolic, not hard, link. */
 int	vflag;				/* Verbose output. */
 					/* System link call. */
@@ -92,10 +93,17 @@ main(argc, argv)
 			usage();
 	}
 
-	while ((ch = getopt(argc, argv, "fsv")) != -1)
+	fflag = iflag = sflag = vflag = 0;
+
+	while ((ch = getopt(argc, argv, "fisv")) != -1)
 		switch (ch) {
 		case 'f':
 			fflag = 1;
+			iflag = 0;	/* -f overrides iflag */
+			break;
+		case 'i':
+			iflag = 1;
+			fflag = 0;	/* -i overrides fflag */
 			break;
 		case 's':
 			sflag = 1;
@@ -139,7 +147,7 @@ linkit(target, source, isdir)
 	int isdir;
 {
 	struct stat sb;
-	int exists;
+	int exists, ch, first;
 	char *p, path[MAXPATHLEN];
 
 	if (!sflag) {
@@ -172,7 +180,23 @@ linkit(target, source, isdir)
 	 * If the file exists, and -f was specified, unlink it.
 	 * Attempt the link.
 	 */
-	if ((fflag && exists && unlink(source)) || (*linkf)(target, source)) {
+	if (fflag && exists && unlink(source)) {
+		warn("%s", source);
+		return (1);
+	} else if (iflag && exists) {
+		fprintf(stderr, "replace %s? ", source);
+		fflush(stderr);
+
+		first = ch = getchar();
+		while(ch != '\n' && ch != EOF)
+			ch = getchar();
+
+		if ((first == 'y' || first == 'Y') && unlink(source)) {
+			warn("%s", source);
+			return (1);
+		}
+	}
+	if ((*linkf)(target, source)) {
 		warn("%s", source);
 		return (1);
 	}
@@ -185,8 +209,8 @@ void
 usage()
 {
 	(void)fprintf(stderr, "%s\n%s\n%s\n",
-	    "usage: ln [-fsv] file1 file2",
-	    "       ln [-fsv] file ... directory",
+	    "usage: ln [-fisv] file1 file2",
+	    "       ln [-fisv] file ... directory",
 	    "       link file1 file2");
 	exit(1);
 }
-- 
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