87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
#include <stdio.h>
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#include <errno.h>
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#include <unistd.h>
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#define CHARGE_NOW_PATH "/sys/class/power_supply/BAT0/charge_now"
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#define CHARGE_FULL_PATH "/sys/class/power_supply/BAT0/charge_full"
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#define VERSION "v0.0"
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#define TITLE "Battery Percentage, by Catluck Kettlemerry"
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#define PROGNAME "battery_percentage"
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#define USAGE0 "Usage: "
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#define USAGE1 "[option]"
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#define OPTIONS0 "Options:"
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#define OPTIONS1 "\t-v run verbosely"
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#define OPTIONS2 "\t-h show help and exit"
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#define OPTIONS3 "\t-t provide terse output"
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int run_verbose = 0;
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int run_terse = 0;
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void print_help(void){
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printf("%s %s\n", TITLE, VERSION);
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printf("%s %s %s\n", USAGE0, PROGNAME, USAGE1);
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printf("%s\n%s\n%s\n%s\n", OPTIONS0, OPTIONS1, OPTIONS2, OPTIONS3);
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}
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int main(int argc, char *const argv[]){
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int opt;
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while((opt = getopt(argc, argv, "vht")) != -1) {
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switch(opt){
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case 'v':
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run_verbose = 1;
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break;
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case 'h':
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print_help();
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return 0;
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case 't':
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run_terse = 1;
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break;
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default:
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printf("Literally how could you pass an unspecified argument to this program");
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}
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}
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FILE * fd_now = fopen(CHARGE_NOW_PATH, "r");
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FILE * fd_full = fopen(CHARGE_FULL_PATH, "r");
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int c_now;
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int c_full;
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int vals_read = fscanf(fd_now, "%d", &c_now);
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if(vals_read != 1){
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if(errno != 0){
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perror("Error reading full battery charge: ");
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} else if(vals_read == EOF){
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printf("End-of-file reached while reading current battery charge(?)");
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} else {
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printf("Invalid number of arguments (%d) returned while reading full battery charge", vals_read);
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}
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return 1;
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}
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vals_read = fscanf(fd_full, "%d", &c_full);
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if(vals_read != 1){
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if(errno != 0){
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perror("Error reading full battery charge: ");
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} else if(vals_read == EOF){
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printf("End-of-file reached while reading full battery charge(?)");
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} else {
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printf("Invalid number of arguments (%d) returned while reading full battery charge", vals_read);
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}
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return 1;
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}
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if(run_verbose){
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printf("Current charge: %d\n microampere-hours", c_now);
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printf("Full charge: %d\n microampere-hours", c_full);
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}
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if(!run_terse) {
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printf("Battery percentage: ");
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}
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float frac = ((float)c_now) / ((float)c_full);
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int pct = (int)(frac * 100);
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printf("%d\n", pct);
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return 0;
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}
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