262 lines
8.3 KiB
C
262 lines
8.3 KiB
C
/*
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This is the modified version of [calculator by MWWorks](https://github.com/MWWorks/mw_calc_numpad/blob/master/calc.c). Below is the quote from [MWWorks](https://github.com/MWWorks).
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Calculator for QMK-based keyboard by MWWorks, https://mwworks.uk
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This is free, usual disclaimers, don't use it to calculate megaton yields, surgery plans, etc
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I did not plan to reinvent the wheel for this - I figured surely somebody somewhere has working calculator code?
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Found lots but none that actually work like you expect a calculator to, hence DIYing it
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As such, this is probably a bit janky, especially as I am a bit of a hack at C
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Seems to be working well, with occasional glitchs, solved by clearing it
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And some occasional floating-point issues - eg get a long decimal rather than the whole number you were expecting
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Feel free to fix it! I think it needs to detect the precision of the two operands and then figure out what the precision of the result should be
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*/
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#include <math.h>
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#include "rubi.h"
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static uint8_t calc_current_operand = 0;
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static char calc_operand_0[CALC_DIGITS+1] = "";
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static char calc_operand_1[CALC_DIGITS+1] = "";
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char calc_result[CALC_DIGITS+1] = "";
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static char calc_status[CALC_DIGITS+1] = "";
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static char calc_operator = ' ';
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static bool calc_reset = false;
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void calcBegin(void){
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}
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//update display
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void calcUpdate(void){
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if (calc_display_lines == 2) {
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if((calc_current_operand == 1) || (calc_reset)){
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strcpy(calc_status, calc_operand_0);
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if((strlen(calc_operand_0)>0) || (strlen(calc_operand_1)>0)){
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uint8_t len = strlen(calc_status);
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if (!(calc_operator == 's' || calc_operator == 'r' || calc_operator == 'n')) {
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calc_status[len] = calc_operator;
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}
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calc_status[len+1] = 0;
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if(calc_reset
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&& !(calc_operator == 's' || calc_operator == 'r' || calc_operator == 'n')){
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strncat(calc_status, calc_operand_1, CALC_DIGITS-strlen(calc_status));
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calc_operator = ' ';
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}
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}
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strcpy(calc_status_display, calc_status);
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}
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} else if (calc_display_lines == 1) {
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if(calc_reset
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&& !(calc_operator == 's' || calc_operator == 'r' || calc_operator == 'n')){
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calc_operator = ' ';
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}
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}
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calc_operator_display = calc_operator;
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strcpy(calc_result_display, calc_result);
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}
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//perform calculation on the 2 operands
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void calcOperands(void){
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float result = 0;
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switch (calc_operator){
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//standard operators
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case '+':
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result = strtod(calc_operand_0, NULL) + strtod(calc_operand_1, NULL);
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break;
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case '-':
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result = strtod(calc_operand_0, NULL) - strtod(calc_operand_1, NULL);
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break;
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case '/':
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result = strtod(calc_operand_0, NULL) / strtod(calc_operand_1, NULL);
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break;
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case '*':
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result = strtod(calc_operand_0, NULL) * strtod(calc_operand_1, NULL);
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break;
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//single operand operators - these are all in 2
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case 's':
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result = sqrt(strtod(calc_operand_0, NULL));
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break;
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case 'r':
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result = 1/(strtod(calc_operand_0, NULL));
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break;
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}
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//now convert the float result into a string
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//we know the total string size but we need to find the size of the integer component to know how much we have for decimals
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uint8_t magnitude = ceil(log10(result));
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uint8_t max_decimals = CALC_DIGITS-magnitude-1;
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//but max it at 7 because that seems the useful limit of our floats
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if(max_decimals>7){
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max_decimals = 7;
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}
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dtostrf(result, CALC_DIGITS, max_decimals, calc_result);
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//now to clean up the result - we need it clean as it may be the input of next calculation
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//this seems a lot of code to format this string :| note that this c doesn't support float in sprintf
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uint8_t i;
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//first find if theres a dot
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uint8_t dotpos = CALC_DIGITS+1;
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for(i=0; i<strlen(calc_result); i++){
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if(calc_result[i] == '.'){
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dotpos = i;
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break;
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}
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}
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//if there is, work back to it and remove trailing 0 or .
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if(dotpos>=0){
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for(i=strlen(calc_result)-1; i>=dotpos; i--){
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if((calc_result[i] == '0') || (calc_result[i] == '.')){
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calc_result[i] = 0;
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}else{
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break;
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}
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}
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}
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//now find how many leading spaces
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uint8_t spaces = 0;
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for(i=0; i<strlen(calc_result); i++){
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if(calc_result[i] == ' '){
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spaces++;
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}else{
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break;
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}
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}
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//and shift the string
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for(i=0; i<strlen(calc_result)-spaces; i++){
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calc_result[i] = calc_result[i+spaces];
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}
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calc_result[strlen(calc_result)-spaces] = 0;
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calcUpdate();
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//the result is available as the first operand for another calculation
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strcpy(calc_operand_0, calc_result);
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calc_operand_1[0] = 0;
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}
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void calcInput(char input){
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char *operand = calc_operand_0;
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if(calc_current_operand == 1){
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operand = calc_operand_1;
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}
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uint8_t len = strlen(operand);
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if(
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((input >= 48) && (input <= 57)) ||
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(input == '.')
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){
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//if this is following an equals, then we start from scratch as if new calculation
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if(calc_reset == true){
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calc_reset = false;
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calc_current_operand = 0;
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calc_operand_0[0] = 0;
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calc_operand_1[0] = 0;
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operand = calc_operand_0;
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len = 0;
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}
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if(len<CALC_DIGITS){
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operand[len] = input;
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operand[len+1] = 0;
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strcpy(calc_result, operand);
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calcUpdate();
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}
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//special input to backspace
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}else if(input == 'x'){
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operand[len-1] = 0;
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strcpy(calc_result, operand);
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calcUpdate();
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//clear
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}else if(input == 'c'){
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operand[0] = 0;
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calc_operand_0[0] = 0;
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calc_operand_1[0] = 0;
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calc_operator = ' ';
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calc_reset = true;
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strcpy(calc_result, operand);
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calcUpdate();
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//special input switch neg/pos
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}else if((input == 'n') && (len>0)){
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uint8_t i;
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if(operand[0] == '-'){
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for(i=1; i<=len; i++){
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operand[i-1] = operand[i];
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}
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}else if(len<CALC_DIGITS){
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for(i=0; i<=len; i++){
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operand[len-i+1] = operand[len-i];
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}
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operand[0] = '-';
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}
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calc_operator = input;
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strcpy(calc_result, operand);
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calcUpdate();
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//standard 2 operand operators
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}else if((input == '+') || (input == '-') || (input == '*') || (input == '/')){
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//get ready for second operand
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if(calc_current_operand == 0){
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calc_operator = input;
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calc_current_operand = 1;
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calcUpdate();
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//we pressed = we now expect a new second operand
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}else if(calc_reset){
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calc_operator = input;
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calc_reset = false;
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calc_operand_1[0] = 0;
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calcUpdate();
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}else {
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//if we use this on the second operand, calculate first, then ready for a second operand again
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if (strlen(calc_operand_1)>0){
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calcOperands();
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}
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calc_operand_1[0] = 0;
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calc_operator = input;
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calcUpdate();
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}
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}else if(input == '='){
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//only accept = if we are on the second operand
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if(calc_current_operand == 1){
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//keep the second operand for a subsequent press of =; but flag to reset if start entry of new operand
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calc_reset = true;
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calcOperands();
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}
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//single operands - square root and reciprocal - needs to operate on 0 so it works after a previous = result
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}else if((input == 's') || (input == 'r')){
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//but maybe we started entering 1
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if(calc_current_operand == 1 && !calc_reset){
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strcpy(calc_operand_0, calc_operand_1);
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}
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calc_current_operand = 1;
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calc_operand_1[0] = 0;
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calc_operator = input;
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calc_reset = true; //simulate another =
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calcOperands();
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}
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}
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