96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "main.h"
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int main(int argc, char **argv) {
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arguments_t * args = parse_arguments(argc, argv);
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printf("%.2Lf\n", (args->price * args->wattage) * args->interval);
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free(args);
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return 0;
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}
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arguments_t * parse_arguments(int argc, char **argv) {
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if (argc == 1) {
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print_usage();
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exit(0);
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}
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arguments_t *args = (arguments_t *)calloc(1, sizeof(arguments_t));
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int pos_args_pos = 0;
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for (int i = 1; i < argc; ++i) {
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if (argv[i][0] == '-') {
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if (argv[i][1] == 'h' || argv[i][2] == 'h') {
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print_usage();
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exit(0);
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} else if (argv[i][1] == 'v' || argv[i][2] == 'v') {
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print_version();
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exit(0);
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}
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} else if (pos_args_pos == 0) {
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args->price = to_wattpersecond((price_t)atof(argv[i]));
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pos_args_pos++;
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} else if (pos_args_pos == 1) {
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args->wattage = atof(argv[i]);
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pos_args_pos++;
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} else if (pos_args_pos > 1) {
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args->interval += to_seconds(argv[i]);
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pos_args_pos++;
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}
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}
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if (pos_args_pos < 3) {
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print_usage();
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exit(1);
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}
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return args;
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}
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interval_t to_seconds(char *interval) {
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interval_t intrvl = (interval_t)atol(interval);
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char unit = interval[strlen(interval) - 1];
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if (!(unit >= '0' && unit <= '9'))
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switch (unit) {
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case 'm':
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case 'M':
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return intrvl * 60;
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case 'h':
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case 'H':
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return intrvl * 60 * 60;
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case 'd':
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case 'D':
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return intrvl * 60 * 60 * 24;
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}
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return intrvl;
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}
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inline price_t to_wattpersecond(price_t price) {
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return price / 1000.f / 3600.f;
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}
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void print_version() {
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puts("kwh-cost Ver. " VERSION "\n"
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"Copyright (C) 2021 Alexander \"Arav\" Andreev <me@arav.top>. All rights reserved.\n"
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"License for this program is stored in /usr/share/licenses/kwh-cost/LICENSE.");
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}
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void print_usage() {
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puts("Usage: kwh-cost [options] price wattage interval [interval ...]\n"
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"Options:\n"
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" --help, -h Display this usage information.\n"
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" --version, -v Display program version.\n"
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"Arguments:\n"
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" price Price per kWh.\n"
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" wattage Specify power usage in Watts.\n"
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" interval Time interval in seconds total cost to be calculated for.\n"
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" You may specify other time units such as:\n"
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" m'imute, h'our, d'ay. Example: 5d 3h.\n"
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" All given intervals will be summed up.");
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}
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