405 lines
12 KiB
C
405 lines
12 KiB
C
/**
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* @file arithmetic.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* Arithmetic functions for unsigned integers.
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*
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* Synopsis:
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* num_lesser(string n1, string n2)
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* num_greater(string n1, string n2)
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* num_lesser_equal(string n1, string n2)
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* num_greater_equal(string n1, string n2)
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* num_equal(string n1, string n2)
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* num_different(string n1, string n2)
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*
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* Variables:
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* (empty) - "true" or "false", reflecting the value of the relation in question
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*
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* Description:
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* These statements perform arithmetic comparisons. The operands passed must be
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* non-negative decimal integers representable in a uintmax_t. Otherwise, an error
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* is triggered.
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*
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* Synopsis:
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* num_add(string n1, string n2)
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* num_subtract(string n1, string n2)
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* num_multiply(string n1, string n2)
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* num_divide(string n1, string n2)
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* num_modulo(string n1, string n2)
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*
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* Description:
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* These statements perform arithmetic operations. The operands passed must be
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* non-negative decimal integers representable in a uintmax_t, and the result must
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* also be representable and non-negative. For divide and modulo, n2 must be non-zero.
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* If any of these restrictions is violated, an error is triggered.
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*
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* Variables:
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* (empty) - the result of the operation as a string representing a decimal number
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <misc/parse_number.h>
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#include <ncd/NCDModule.h>
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#include <ncd/static_strings.h>
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#include <ncd/extra/value_utils.h>
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#include <generated/blog_channel_ncd_arithmetic.h>
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#define ModuleLog(i, ...) NCDModuleInst_Backend_Log((i), BLOG_CURRENT_CHANNEL, __VA_ARGS__)
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struct boolean_instance {
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NCDModuleInst *i;
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int value;
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};
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typedef int (*boolean_compute_func) (uintmax_t n1, uintmax_t n2);
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struct number_instance {
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NCDModuleInst *i;
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uintmax_t value;
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};
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typedef int (*number_compute_func) (NCDModuleInst *i, uintmax_t n1, uintmax_t n2, uintmax_t *out);
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static int compute_lesser (uintmax_t n1, uintmax_t n2)
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{
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return n1 < n2;
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}
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static int compute_greater (uintmax_t n1, uintmax_t n2)
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{
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return n1 > n2;
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}
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static int compute_lesser_equal (uintmax_t n1, uintmax_t n2)
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{
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return n1 <= n2;
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}
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static int compute_greater_equal (uintmax_t n1, uintmax_t n2)
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{
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return n1 >= n2;
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}
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static int compute_equal (uintmax_t n1, uintmax_t n2)
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{
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return n1 == n2;
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}
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static int compute_different (uintmax_t n1, uintmax_t n2)
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{
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return n1 != n2;
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}
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static int compute_add (NCDModuleInst *i, uintmax_t n1, uintmax_t n2, uintmax_t *out)
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{
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if (n1 > UINTMAX_MAX - n2) {
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ModuleLog(i, BLOG_ERROR, "addition overflow");
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return 0;
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}
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*out = n1 + n2;
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return 1;
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}
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static int compute_subtract (NCDModuleInst *i, uintmax_t n1, uintmax_t n2, uintmax_t *out)
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{
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if (n1 < n2) {
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ModuleLog(i, BLOG_ERROR, "subtraction underflow");
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return 0;
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}
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*out = n1 - n2;
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return 1;
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}
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static int compute_multiply (NCDModuleInst *i, uintmax_t n1, uintmax_t n2, uintmax_t *out)
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{
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if (n1 > UINTMAX_MAX / n2) {
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ModuleLog(i, BLOG_ERROR, "multiplication overflow");
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return 0;
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}
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*out = n1 * n2;
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return 1;
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}
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static int compute_divide (NCDModuleInst *i, uintmax_t n1, uintmax_t n2, uintmax_t *out)
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{
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if (n2 == 0) {
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ModuleLog(i, BLOG_ERROR, "division quotient is zero");
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return 0;
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}
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*out = n1 / n2;
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return 1;
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}
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static int compute_modulo (NCDModuleInst *i, uintmax_t n1, uintmax_t n2, uintmax_t *out)
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{
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if (n2 == 0) {
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ModuleLog(i, BLOG_ERROR, "modulo modulus is zero");
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return 0;
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}
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*out = n1 % n2;
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return 1;
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}
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static void new_boolean_templ (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params, boolean_compute_func cfunc)
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{
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struct boolean_instance *o = vo;
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o->i = i;
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NCDValRef n1_arg;
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NCDValRef n2_arg;
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if (!NCDVal_ListRead(params->args, 2, &n1_arg, &n2_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsString(n1_arg) || !NCDVal_IsString(n2_arg)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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uintmax_t n1;
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if (!ncd_read_uintmax(n1_arg, &n1)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong first argument");
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goto fail0;
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}
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uintmax_t n2;
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if (!ncd_read_uintmax(n2_arg, &n2)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong second argument");
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goto fail0;
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}
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o->value = cfunc(n1, n2);
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NCDModuleInst_Backend_Up(i);
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return;
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static int boolean_func_getvar2 (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out)
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{
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struct boolean_instance *o = vo;
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if (name == NCD_STRING_EMPTY) {
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*out = ncd_make_boolean(mem, o->value, o->i->params->iparams->string_index);
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return 1;
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}
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return 0;
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}
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static void new_number_templ (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params, number_compute_func cfunc)
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{
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struct number_instance *o = vo;
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o->i = i;
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NCDValRef n1_arg;
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NCDValRef n2_arg;
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if (!NCDVal_ListRead(params->args, 2, &n1_arg, &n2_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsString(n1_arg) || !NCDVal_IsString(n2_arg)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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uintmax_t n1;
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if (!ncd_read_uintmax(n1_arg, &n1)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong first argument");
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goto fail0;
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}
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uintmax_t n2;
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if (!ncd_read_uintmax(n2_arg, &n2)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong second argument");
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goto fail0;
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}
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if (!cfunc(i, n1, n2, &o->value)) {
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goto fail0;
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}
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NCDModuleInst_Backend_Up(i);
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return;
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static int number_func_getvar2 (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out)
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{
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struct number_instance *o = vo;
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if (name == NCD_STRING_EMPTY) {
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*out = ncd_make_uintmax(mem, o->value);
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return 1;
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}
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return 0;
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}
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static void func_new_lesser (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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new_boolean_templ(vo, i, params, compute_lesser);
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}
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static void func_new_greater (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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new_boolean_templ(vo, i, params, compute_greater);
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}
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static void func_new_lesser_equal (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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new_boolean_templ(vo, i, params, compute_lesser_equal);
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}
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static void func_new_greater_equal (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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new_boolean_templ(vo, i, params, compute_greater_equal);
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}
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static void func_new_equal (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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new_boolean_templ(vo, i, params, compute_equal);
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}
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static void func_new_different (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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new_boolean_templ(vo, i, params, compute_different);
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}
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static void func_new_add (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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new_number_templ(vo, i, params, compute_add);
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}
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static void func_new_subtract (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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new_number_templ(vo, i, params, compute_subtract);
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}
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static void func_new_multiply (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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new_number_templ(vo, i, params, compute_multiply);
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}
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static void func_new_divide (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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new_number_templ(vo, i, params, compute_divide);
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}
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static void func_new_modulo (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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new_number_templ(vo, i, params, compute_modulo);
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}
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static struct NCDModule modules[] = {
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{
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.type = "num_lesser",
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.func_new2 = func_new_lesser,
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.func_getvar2 = boolean_func_getvar2,
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.alloc_size = sizeof(struct boolean_instance),
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.flags = NCDMODULE_FLAG_ACCEPT_NON_CONTINUOUS_STRINGS
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}, {
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.type = "num_greater",
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.func_new2 = func_new_greater,
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.func_getvar2 = boolean_func_getvar2,
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.alloc_size = sizeof(struct boolean_instance),
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.flags = NCDMODULE_FLAG_ACCEPT_NON_CONTINUOUS_STRINGS
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}, {
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.type = "num_lesser_equal",
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.func_new2 = func_new_lesser_equal,
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.func_getvar2 = boolean_func_getvar2,
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.alloc_size = sizeof(struct boolean_instance),
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.flags = NCDMODULE_FLAG_ACCEPT_NON_CONTINUOUS_STRINGS
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}, {
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.type = "num_greater_equal",
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.func_new2 = func_new_greater_equal,
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.func_getvar2 = boolean_func_getvar2,
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.alloc_size = sizeof(struct boolean_instance),
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.flags = NCDMODULE_FLAG_ACCEPT_NON_CONTINUOUS_STRINGS
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}, {
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.type = "num_equal",
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.func_new2 = func_new_equal,
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.func_getvar2 = boolean_func_getvar2,
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.alloc_size = sizeof(struct boolean_instance),
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.flags = NCDMODULE_FLAG_ACCEPT_NON_CONTINUOUS_STRINGS
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}, {
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.type = "num_different",
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.func_new2 = func_new_different,
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.func_getvar2 = boolean_func_getvar2,
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.alloc_size = sizeof(struct boolean_instance),
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.flags = NCDMODULE_FLAG_ACCEPT_NON_CONTINUOUS_STRINGS
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}, {
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.type = "num_add",
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.func_new2 = func_new_add,
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.func_getvar2 = number_func_getvar2,
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.alloc_size = sizeof(struct number_instance),
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.flags = NCDMODULE_FLAG_ACCEPT_NON_CONTINUOUS_STRINGS
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}, {
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.type = "num_subtract",
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.func_new2 = func_new_subtract,
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.func_getvar2 = number_func_getvar2,
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.alloc_size = sizeof(struct number_instance),
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.flags = NCDMODULE_FLAG_ACCEPT_NON_CONTINUOUS_STRINGS
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}, {
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.type = "num_multiply",
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.func_new2 = func_new_multiply,
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.func_getvar2 = number_func_getvar2,
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.alloc_size = sizeof(struct number_instance),
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.flags = NCDMODULE_FLAG_ACCEPT_NON_CONTINUOUS_STRINGS
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}, {
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.type = "num_divide",
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.func_new2 = func_new_divide,
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.func_getvar2 = number_func_getvar2,
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.alloc_size = sizeof(struct number_instance),
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.flags = NCDMODULE_FLAG_ACCEPT_NON_CONTINUOUS_STRINGS
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}, {
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.type = "num_modulo",
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.func_new2 = func_new_modulo,
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.func_getvar2 = number_func_getvar2,
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.alloc_size = sizeof(struct number_instance),
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.flags = NCDMODULE_FLAG_ACCEPT_NON_CONTINUOUS_STRINGS
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}, {
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.type = NULL
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}
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};
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const struct NCDModuleGroup ncdmodule_arithmetic = {
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.modules = modules
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};
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