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101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/*
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* c_help - custom help function
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*
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* Copyright (C) 1999-2004,2021-2023 Landon Curt Noll
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*
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* Calc is open software; you can redistribute it and/or modify it under
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* the terms of the version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* Calc is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* Public License for more details.
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*
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* A copy of version 2.1 of the GNU Lesser General Public License is
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* distributed with calc under the filename COPYING-LGPL. You should have
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* received a copy with calc; if not, write to Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Under source code control: 1997/03/09 05:25:41
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* File existed as early as: 1997
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*
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* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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*/
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/*
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* ISO C requires a translation unit to contain at least one declaration,
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* so we declare a global variable whose value is based on if CUSTOM is defined.
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*/
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#if defined(CUSTOM)
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int c_help_allowed = 1; /* CUSTOM defined */
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#else /* CUSTOM */
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int c_help_allowed = 0; /* CUSTOM undefined */
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#endif /* CUSTOM */
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#if defined(CUSTOM)
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#include "../have_unistd.h"
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#if defined(HAVE_UNISTD_H)
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#include <unistd.h>
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#endif
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#include "../have_const.h"
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#include "../value.h"
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#include "../custom.h"
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#include "../have_unused.h"
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#include "../errtbl.h"
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#include "../banned.h" /* include after system header <> includes */
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/*
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* c_help - custom help function
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*
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* This function assumes that a help file with the same name as
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* the custom function has been installed by the custom/Makefile
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* (as listed in the CUSTOM_HELP makefile variable) under the
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* CUSTOMHELPDIR == HELPDIR/custhelp directory.
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*
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* The help command first does a search in HELPDIR and later
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* in CUSTOMHELPDIR. If a custom help file has the same name
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* as a file under HELPDIR then help will display the HELPDIR
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* file and NOT the custom file. This function will ignore
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* and HELPDIR file and work directly with the custom help file.
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*
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* given:
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* vals[0] name of the custom help file to directly access
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*/
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/*ARGSUSED*/
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VALUE
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c_help(char *UNUSED(name), int UNUSED(count), VALUE **vals)
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{
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VALUE result; /* what we will return */
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/*
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* parse args
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*/
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if (vals[0]->v_type != V_STR) {
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math_error("custom help arg 1 must be a string");
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not_reached();
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}
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/*
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* give the help
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*/
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customhelp((char *)vals[0]->v_str);
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/*
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* return NULL
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*/
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result.v_type = V_NULL;
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return result;
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}
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#endif /* CUSTOM */
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