Make less act like more(1) when it is invoked as more.

Obtained from:	NetBSD

5 files changed, 49 insertions, 10 deletions

diff --git a/contrib/less/command.c b/contrib/less/command.c
index 95c529f758c8..b3fbedb3da1f 100644
--- a/contrib/less/command.c
+++ b/contrib/less/command.c
@@ -1,3 +1,4 @@
+/* $FreeBSD$ */
 /*
  * Copyright (C) 1984-2000  Mark Nudelman
  *
@@ -35,6 +36,7 @@ extern int ignore_eoi;
 extern int secure;
 extern int hshift;
 extern int show_attn;
+extern int more_mode;
 extern char *every_first_cmd;
 extern char *curr_altfilename;
 extern char version[];
@@ -468,12 +470,16 @@ mca_char(c)
 		flag = 0;
 		switch (c)
 		{
-		case CONTROL('E'): /* ignore END of file */
 		case '*':
+			if (more_mode)
+				break;
+		case CONTROL('E'): /* ignore END of file */
 			flag = SRCH_PAST_EOF;
 			break;
-		case CONTROL('F'): /* FIRST file */
 		case '@':
+			if (more_mode)
+				break;
+		case CONTROL('F'): /* FIRST file */
 			flag = SRCH_FIRST_FILE;
 			break;
 		case CONTROL('K'): /* KEEP position */
diff --git a/contrib/less/forwback.c b/contrib/less/forwback.c
index 722bce55a0cc..d8071aaf26e8 100644
--- a/contrib/less/forwback.c
+++ b/contrib/less/forwback.c
@@ -1,3 +1,4 @@
+/* $FreeBSD$ */
 /*
  * Copyright (C) 1984-2000  Mark Nudelman
  *
@@ -27,6 +28,7 @@ extern int top_scroll;
 extern int quiet;
 extern int sc_width, sc_height;
 extern int quit_at_eof;
+extern int more_mode;
 extern int plusoption;
 extern int forw_scroll;
 extern int back_scroll;
@@ -142,9 +144,12 @@ forw(n, pos, force, only_last, nblank)
 			pos_clear();
 			add_forw_pos(pos);
 			force = 1;
-			if (top_scroll == OPT_ONPLUS || first_time)
-				clear();
-			home();
+			if (more_mode == 0)
+			{
+				if (top_scroll == OPT_ONPLUS || first_time)
+					clear();
+				home();
+			}
 		} else
 		{
 			clear_bot();
diff --git a/contrib/less/main.c b/contrib/less/main.c
index 2c69d877592c..9f5e1c3d491a 100644
--- a/contrib/less/main.c
+++ b/contrib/less/main.c
@@ -1,3 +1,4 @@
+/* $FreeBSD$ */
 /*
  * Copyright (C) 1984-2000  Mark Nudelman
  *
@@ -29,6 +30,7 @@ public char *	progname;
 public int	quitting;
 public int	secure;
 public int	dohelp;
+public int	more_mode = 0;
 
 #if LOGFILE
 public int	logfile = -1;
@@ -60,6 +62,7 @@ main(argc, argv)
 {
 	IFILE ifile;
 	char *s;
+	extern char *__progname;
 
 #ifdef __EMX__
 	_response(&argc, &argv);
@@ -99,6 +102,9 @@ main(argc, argv)
 	 * Process command line arguments and LESS environment arguments.
 	 * Command line arguments override environment arguments.
 	 */
+	if (strcmp(__progname, "more") == 0)
+		more_mode = 1;
+
 	is_tty = isatty(1);
 	get_term();
 	init_cmds();
@@ -106,7 +112,16 @@ main(argc, argv)
 	init_charset();
 	init_line();
 	init_option();
-	s = lgetenv("LESS");
+	
+	if (more_mode) {
+		scan_option("-E");
+		scan_option("-m");
+		scan_option("-G");
+		scan_option("-f");
+		s = lgetenv("MORE");
+	} else {
+		s = lgetenv("LESS");
+	}
 	if (s != NULL)
 		scan_option(save(s));
 
@@ -197,7 +212,7 @@ main(argc, argv)
 		quit(QUIT_OK);
 	}
 
-	if (missing_cap && !know_dumb)
+	if (missing_cap && !know_dumb && !more_mode)
 		error("WARNING: terminal is not fully functional", NULL_PARG);
 	init_mark();
 	raw_mode(1);
diff --git a/contrib/less/screen.c b/contrib/less/screen.c
index 20aa81aaa7dc..cd3d885905cb 100644
--- a/contrib/less/screen.c
+++ b/contrib/less/screen.c
@@ -1,3 +1,4 @@
+/* $FreeBSD$ */
 /*
  * Copyright (C) 1984-2000  Mark Nudelman
  *
@@ -223,6 +224,8 @@ extern int quiet;		/* If VERY_QUIET, use visual bell for bell */
 extern int no_back_scroll;
 extern int swindow;
 extern int no_init;
+extern int quit_at_eof;
+extern int more_mode;
 extern int sigs;
 extern int wscroll;
 extern int screen_trashed;
@@ -1108,11 +1111,19 @@ get_term()
 	if (sc_e_keypad == NULL)
 		sc_e_keypad = "";
 		
-	sc_init = ltgetstr("ti", &sp);
+	/*
+	 * This loses for terminals with termcap entries with ti/te strings
+	 * that switch to/from an alternate screen, and we're in quit_at_eof
+	 * (eg, more(1)).
+ 	 */
+	if (!quit_at_eof && !more_mode) {
+		sc_init = ltgetstr("ti", &sp);
+		sc_deinit = ltgetstr("te", &sp);
+	}
+
 	if (sc_init == NULL)
 		sc_init = "";
 
-	sc_deinit= ltgetstr("te", &sp);
 	if (sc_deinit == NULL)
 		sc_deinit = "";
 
diff --git a/contrib/less/search.c b/contrib/less/search.c
index f53352740ded..030bdab7738b 100644
--- a/contrib/less/search.c
+++ b/contrib/less/search.c
@@ -1,3 +1,4 @@
+/* $FreeBSD$ */
 /*
  * Copyright (C) 1984-2000  Mark Nudelman
  *
@@ -22,7 +23,7 @@
 #if HAVE_POSIX_REGCOMP
 #include <regex.h>
 #ifdef REG_EXTENDED
-#define	REGCOMP_FLAG	REG_EXTENDED
+#define	REGCOMP_FLAG	(more_mode ? 0 : REG_EXTENDED)
 #else
 #define	REGCOMP_FLAG	0
 #endif
@@ -52,6 +53,7 @@ extern int linenums;
 extern int sc_height;
 extern int jump_sline;
 extern int bs_mode;
+extern int more_mode;
 extern POSITION start_attnpos;
 extern POSITION end_attnpos;
 #if HILITE_SEARCH