108 lines
3.4 KiB
C
108 lines
3.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define VERSION "1.1.2"
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typedef long double price_t;
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typedef long double wattage_t;
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typedef unsigned long interval_t;
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int parse_arguments(const int argc, const char *const *const argv,
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price_t *const price, wattage_t *const wattage, interval_t *const interval);
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interval_t interval_to_seconds(const char *const interval);
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price_t price_kwh_to_wattsecond(const price_t price);
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void print_version(void);
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void print_usage(void);
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int main(const int argc, const char *const *const argv) {
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price_t price;
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wattage_t wattage;
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interval_t interval = 0;
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switch (parse_arguments(argc, argv, &price, &wattage, &interval)) {
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case 1: print_usage(); exit(0);
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case 2: print_version(); exit(0);
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case 99: fputs("Unknown flag provided.\n", stderr); print_usage(); exit(1);
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}
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printf("%.2Lf\n", (price * wattage) * interval);
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return 0;
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}
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int parse_arguments(const int argc, const char *const *const argv,
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price_t *const price, wattage_t *const wattage, interval_t *const interval) {
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if (argc < 2) return 1;
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for (int i = 1, pos = 0; i < argc; ++i)
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if (argv[i][0] == '-') {
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size_t l = strlen(argv[i]);
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if (l < 2)
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return 99;
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if (argv[i][1] == 'h' || (argv[i][1] == '-' && l > 2 && argv[i][2] == 'h'))
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return 1;
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else if (argv[i][1] == 'v' || (argv[i][1] == '-' && l > 2 && argv[i][2] == 'v'))
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return 2;
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else
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return 99;
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} else if (argc < 4) {
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return 1;
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} else if (pos == 0) {
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*price = price_kwh_to_wattsecond((price_t)atof(argv[i]));
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++pos;
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} else if (pos == 1) {
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*wattage = (wattage_t)atof(argv[2]);
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++pos;
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} else
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*interval += interval_to_seconds(argv[i]);
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return 0;
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}
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interval_t interval_to_seconds(const char *const interval) {
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interval_t intrvl = (interval_t)atol(interval);
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switch (interval[strlen(interval) - 1]) {
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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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default:
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return intrvl;
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}
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}
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price_t price_kwh_to_wattsecond(const price_t price) {
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return price / 1000.f / 3600.f;
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}
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void print_version(void) {
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fputs("kwh-cost Ver. " VERSION "\n"
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"Copyright (C) 2021-2024 Alexander \"Arav\" Andreev <me@arav.su>. All rights reserved.\n"
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"This program is distributed under the terms of MIT+NIGGER licence.\n"
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"You can see a license for this program in /usr/share/licenses/kwh-cost/LICENSE.\n", stderr);
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}
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void print_usage(void) {
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fputs("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 power usage in Watts.\n"
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" interval time interval in seconds during which\n"
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" this much power to be constantly used.\n"
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" You may specify other time units such as:\n"
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" m'inute, h'our, d'ay. Example: 5d 3h.\n"
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" All given intervals will be summed up.\n", stderr);
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}
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