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/* $OpenBSD: help.c,v 1.5 2003/04/14 14:33:57 millert Exp $ */
/*
* Copyright (c) 1984,1985,1989,1994,1995 Mark Nudelman
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice in the documentation and/or other materials provided with
* the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* 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"
extern char *progname;
public void
help(nomsg)
int nomsg;
{
#ifdef HELPFILE
char *helpfile;
char *cmd;
size_t len;
helpfile = find_helpfile();
if (helpfile == NULL)
{
error("Cannot find help file", NULL_PARG);
return;
}
#if !HAVE_SYSTEM
/*
* Just examine the help file.
*/
(void) edit(helpfile);
#else
/*
* Use lsystem() to invoke a new instance of less
* to view the help file.
*/
#if MSDOS_COMPILER
putenv("LESS=-m -H -+E -+s -PmHELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done");
len = strlen(helpfile) + strlen(progname) + 3;
cmd = (char *) ecalloc(len, sizeof(char));
snprintf(cmd, len, "-%s %s", progname, helpfile);
#else
len = strlen(helpfile) + strlen(progname) + 150;
cmd = (char *) ecalloc(len, sizeof(char));
#if OS2
snprintf(cmd, len,
"-%s -m -H -+E -+s \"-PmHELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done \" %s",
progname, helpfile);
#else
snprintf(cmd, len,
"-%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
#endif
free(helpfile);
lsystem(cmd, (char*)NULL);
if (!nomsg)
error("End of help", NULL_PARG);
free(cmd);
#endif
#else
error("Cannot find help file", NULL_PARG);
#endif
}
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