X-Git-Url: https://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=progs%2Fclear.c;h=97cb0f3651deb65c53365b78821cde7601173e1d;hp=b813f0e40635a4fbe10e28d454f7dc95945fbb7e;hb=81304798ee736c467839c779c9ca5dca48db7bea;hpb=661078ddbde3ce0f3b06e95642fbb9b5fef7dca1

diff --git a/progs/clear.c b/progs/clear.c
index b813f0e4..97cb0f36 100644
--- a/progs/clear.c
+++ b/progs/clear.c
@@ -1,5 +1,6 @@
 /****************************************************************************
- * Copyright (c) 1998 Free Software Foundation, Inc.                        *
+ * Copyright 2020,2021 Thomas E. Dickey                                     *
+ * Copyright 1998-2016,2017 Free Software Foundation, Inc.                  *
  *                                                                          *
  * Permission is hereby granted, free of charge, to any person obtaining a  *
  * copy of this software and associated documentation files (the            *
@@ -29,31 +30,79 @@
 /****************************************************************************
  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
+ *     and: Thomas E. Dickey                        1996-on                 *
  ****************************************************************************/
 
-
 /*
  * clear.c --  clears the terminal's screen
  */
 
-#include <progs.priv.h>
+#define USE_LIBTINFO
+#include <clear_cmd.h>
+#include <tty_settings.h>
 
-#include <curses.h>
+MODULE_ID("$Id: clear.c,v 1.24 2021/03/20 18:23:14 tom Exp $")
 
-MODULE_ID("$Id: clear.c,v 1.7 1998/02/11 12:14:02 tom Exp $")
+const char *_nc_progname = "clear";
 
-static int putch(int c)
+static GCC_NORETURN void
+usage(void)
 {
-	return putchar(c);
+#define KEEP(s) s "\n"
+    static const char msg[] =
+    {
+	KEEP("")
+	KEEP("Options:")
+	KEEP("  -T TERM     use this instead of $TERM")
+	KEEP("  -V          print curses-version")
+	KEEP("  -x          do not try to clear scrollback")
+    };
+#undef KEEP
+    (void) fprintf(stderr, "Usage: %s [options]\n", _nc_progname);
+    fputs(msg, stderr);
+    ExitProgram(EXIT_FAILURE);
 }
 
-int main(
+int
+main(
 	int argc GCC_UNUSED,
-	char *argv[] GCC_UNUSED)
+	char *argv[]GCC_UNUSED)
 {
-	setupterm((char *) 0, STDOUT_FILENO, (int *) 0);
-	if (clear_screen == (char *) 0)
-		return EXIT_FAILURE;
-	tputs(clear_screen, lines > 0 ? lines : 1, putch);
-	return EXIT_SUCCESS;
+    TTY tty_settings;
+    int fd;
+    int c;
+    char *term;
+    bool opt_x = FALSE;		/* clear scrollback if possible */
+
+    _nc_progname = _nc_rootname(argv[0]);
+    term = getenv("TERM");
+
+    while ((c = getopt(argc, argv, "T:Vx")) != -1) {
+	switch (c) {
+	case 'T':
+	    use_env(FALSE);
+	    use_tioctl(TRUE);
+	    term = optarg;
+	    break;
+	case 'V':
+	    puts(curses_version());
+	    ExitProgram(EXIT_SUCCESS);
+	case 'x':		/* do not try to clear scrollback */
+	    opt_x = TRUE;
+	    break;
+	default:
+	    usage();
+	    /* NOTREACHED */
+	}
+    }
+    if (optind < argc)
+	usage();
+
+    fd = save_tty_settings(&tty_settings, FALSE);
+
+    setupterm(term, fd, (int *) 0);
+
+    ExitProgram((clear_cmd(opt_x) == ERR)
+		? EXIT_FAILURE
+		: EXIT_SUCCESS);
 }