Add the -n option, which automatically answers "no" to the overwrite question.

PR:		7828
Suggested by:	Daniel O'Connor <doconnor@gsoft.com.au>
Approved by:	sheldonh (mentor)
MFC after:	2 weeks

bin/cp/cp.1

@@ -47,7 +47,7 @@
 .Fl R
 .Op Fl H | Fl L | Fl P
 .Oc
-.Op Fl f | i
+.Op Fl f | i | n
 .Op Fl pv
 .Ar source_file target_file
 .Nm
@@ -55,7 +55,7 @@
 .Fl R
 .Op Fl H | Fl L | Fl P
 .Oc
-.Op Fl f | i
+.Op Fl f | i | n
 .Op Fl pv
 .Ar source_file ... target_directory
 .Sh DESCRIPTION
@@ -121,6 +121,8 @@ regardless of its permissions.
 .Fl f
 option overrides any previous
 .Fl i
+or
+.Fl n
 options.)
 .It Fl i
 Cause
@@ -136,6 +138,17 @@ the file copy is attempted.
 .Fl i
 option overrides any previous
 .Fl f
+or
+.Fl n
+options.)
+.It Fl n
+Do not overwriting an existing file.
+(The
+.Fl n
+option overrides any previous
+.Fl f
+or
+.Fl i
 options.)
 .It Fl p
 Cause
@@ -226,7 +239,9 @@ or fifo's.
 .Pp
 The
 .Fl v
-option is non-standard and its use in scripts is not recommended.
+and
+.Fl n
+options are non-standard and their use in scripts is not recommended.
 .Sh SEE ALSO
 .Xr mv 1 ,
 .Xr rcp 1 ,

bin/cp/cp.c

@@ -86,8 +86,8 @@ static char emptystring[] = "";
 
 PATH_T to = { to.p_path, emptystring, "" };
 
-int iflag, pflag, fflag;
+int fflag, iflag, nflag, pflag, vflag;
-static int Rflag, rflag, vflag;
+static int Rflag, rflag;
 
 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE };
 
@@ -103,7 +103,7 @@ main(int argc, char *argv[])
 	char *target;
 
 	Hflag = Lflag = Pflag = 0;
-	while ((ch = getopt(argc, argv, "HLPRfiprv")) != -1)
+	while ((ch = getopt(argc, argv, "HLPRfinprv")) != -1)
 		switch (ch) {
 		case 'H':
 			Hflag = 1;
@@ -122,11 +122,15 @@ main(int argc, char *argv[])
 			break;
 		case 'f':
 			fflag = 1;
-			iflag = 0;
+			iflag = nflag = 0;
 			break;
 		case 'i':
 			iflag = 1;
-			fflag = 0;
+			fflag = nflag = 0;
+			break;
+		case 'n':
+			nflag = 1;
+			fflag = iflag = 0;
 			break;
 		case 'p':
 			pflag = 1;

bin/cp/extern.h

@@ -41,7 +41,7 @@ typedef struct {
 } PATH_T;
 
 extern PATH_T to;
-extern int fflag, iflag, pflag;
+extern int fflag, iflag, nflag, pflag, vflag;
 
 __BEGIN_DECLS
 int	copy_fifo(struct stat *, int);

bin/cp/utils.c

@@ -87,7 +87,11 @@ copy_file(FTSENT *entp, int dne)
 	 */
 	if (!dne) {
 #define YESNO "(y/n [n]) "
-		if (iflag) {
+		if (nflag) {
+			if (vflag)
+				printf("%s not overwritten\n", to.p_path);
+			return (0);
+		} else if (iflag) {
 			(void)fprintf(stderr, "overwrite %s? %s", 
 					to.p_path, YESNO);
 			checkch = ch = getchar();
@@ -300,7 +304,7 @@ usage(void)
 {
 
 	(void)fprintf(stderr, "%s\n%s\n",
-"usage: cp [-R [-H | -L | -P]] [-f | -i] [-pv] src target",
+"usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src target",
-"       cp [-R [-H | -L | -P]] [-f | -i] [-pv] src1 ... srcN directory");
+"       cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src1 ... srcN directory");
 	exit(EX_USAGE);
 }