90 lines
2.7 KiB
C
90 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 const 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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int res = parse_arguments(argc, argv, &price, &wattage, &interval);
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if (res != 0) {
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if (res == 1)
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print_usage();
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else if (res == 2)
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print_version();
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exit(0);
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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, 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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if (argv[i][1] == 'h' || argv[i][2] == 'h')
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return 1;
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else if (argv[i][1] == 'v' || argv[i][2] == 'v')
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return 2;
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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 = to_wattspersecond((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_t)interval_to_seconds(argv[i]);
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return 0;
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}
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inline 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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inline price_t to_wattspersecond(const price_t price) {
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return price / 1000.f / 3600.f;
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}
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inline 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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"You can see a license for this program in /usr/share/licenses/kwh-cost/LICENSE.");
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}
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inline 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'inute, 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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