--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/miscellany/less-177/help.c	Mon Apr 18 23:46:02 2005 +0900
@@ -0,0 +1,54 @@
+/*
+ * Display some help.
+ * Just invoke another "less" to display the help file.
+ *
+ * {{ This makes this function very simple, and makes changing the
+ *    help file very easy, but it may present difficulties on
+ *    (non-Unix) systems which do not supply the "system()" function. }}
+ */
+
+#include  "less.h"
+
+#if __MSDOS__
+#include <io.h>
+#include <dir.h>
+#include <string.h>
+#include <stdlib.h>
+extern int output_mode;
+#endif
+
+extern char *progname;
+
+	public void
+help()
+{
+	char *helpfile;
+	char *cmd;
+
+	helpfile = find_helpfile();
+	if (helpfile == NULL)
+	{
+		error("Cannot find help file", NULL_PARG);
+		return;
+	}
+#if __MSDOS__
+	putenv("LESS=-+v -+E -+s -mHPmHELP -- ?eEND -- Press g to see "
+		"it again:Press RETURN for more., or q when done ");
+	cmd = (char *) ecalloc(strlen(helpfile) + strlen(progname) + 50,
+				sizeof(char));
+	if (output_mode == 0)
+		sprintf(cmd, "-%s %s", progname, helpfile);
+	else
+		sprintf(cmd, "-%s -qVW4,4,76,23,Help %s", progname, helpfile);
+#else
+	cmd = (char *) ecalloc(strlen(helpfile) + strlen(progname) + 150,
+				sizeof(char));
+	sprintf(cmd, 
+	 "-%s -m -H -+E -+s '-PmHELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done ' %s",
+		progname, helpfile);
+#endif
+	free(helpfile);
+	lsystem(cmd);
+	error("End of help", NULL_PARG);
+	free(cmd);
+}