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142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
/*
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* c_register - set or print a custom register value
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*
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* Copyright (C) 2007,2021-2023 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: 2007/07/14 20:23:46
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* File existed as early as: 2007
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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_register_allowed = 1; /* CUSTOM defined */
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#else /* CUSTOM */
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int c_register_allowed = 0; /* CUSTOM undefined */
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#endif /* CUSTOM */
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#if defined(CUSTOM)
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#include <stdio.h>
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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 "../config.h"
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#include "../calc.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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* registers
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*/
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STATIC VALUE custom_reg[CUSTOM_REG_MAX+1];
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/*
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* init_custreg - initialize custom registers
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*/
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void
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init_custreg(void)
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{
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int i;
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/*
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* set the registers to zero
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*/
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for (i=0; i < CUSTOM_REG_MAX+1; ++i) {
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custom_reg[i].v_type = V_NUM;
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custom_reg[i].v_subtype = V_NOSUBTYPE;
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custom_reg[i].v_num = itoq(0);
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}
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return;
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}
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/*
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* c_register - set or print a custom register value
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*
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* given:
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* vals[i] and arg to display information about
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*
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* returns:
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* count
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*/
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/*ARGSUSED*/
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VALUE
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c_register(char *UNUSED(name), int count, VALUE **vals)
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{
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VALUE result; /* what we will return */
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long reg; /* register number */
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/*
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* arg check
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*/
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result.v_type = V_NULL;
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if (vals[0]->v_type != V_NUM) {
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math_error("Non-numeric register number");
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not_reached();
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}
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if (qisfrac(vals[0]->v_num)) {
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math_error("Non-integer register number");
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not_reached();
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}
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if (qisneg(vals[0]->v_num)) {
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math_error("register number < 0");
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not_reached();
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}
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if (! qistiny(vals[0]->v_num)) {
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math_error("register is huge");
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not_reached();
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}
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reg = qtoi(vals[0]->v_num);
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if (reg > CUSTOM_REG_MAX) {
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math_error("register is larger than CUSTOM_REG_MAX");
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not_reached();
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}
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/*
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* print info on each arg
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*/
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/* save previous value */
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copyvalue(&custom_reg[reg], &result);
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/* set the new value if a 2nd arg was given */
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if (count == 2) {
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copyvalue(vals[1], &custom_reg[reg]);
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}
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/*
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* return result
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*/
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return result;
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}
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#endif /* CUSTOM */
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