git.scottworley.com Git - batteryviewer/blob - batteryviewer.c

   1 #include "chart.h"
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <gtk/gtk.h>
   5 #include <math.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8
   9 struct State {
  10   char *voltage_filename;
  11   char *current_filename;
  12   BVChart *voltage;
  13   BVChart *current;
  14 };
  15
  16 static float fatof(const char *filename) {
  17   FILE *f = fopen(filename, "r");
  18   if (f == NULL) {
  19     return NAN;
  20   }
  21
  22   const int bufsize = 1024;
  23   char buf[bufsize];
  24   const int read = fread(buf, sizeof(char), bufsize, f);
  25   if (read == 0 || read == bufsize || ferror(f)) {
  26     fclose(f);
  27     return NAN;
  28   }
  29   fclose(f);
  30
  31   char *end;
  32   errno = 0;
  33   float val = strtof(buf, &end);
  34   int parsed = end - buf;
  35   gboolean parsed_all = parsed == read;
  36   gboolean parsed_all_but_space = parsed == read - 1 && isspace(*end);
  37   gboolean parse_ok = parsed_all || parsed_all_but_space;
  38   if (errno != 0 || parsed == 0 || !parse_ok) {
  39     return NAN;
  40   }
  41   return val;
  42 }
  43
  44 static gboolean collect_data(struct State *state) {
  45   fprintf(stderr, "Voltage: %f, current: %f\n", fatof(state->voltage_filename),
  46           fatof(state->current_filename));
  47   return TRUE;
  48 }
  49
  50 static void activate(GtkApplication *app, gpointer user_data) {
  51
  52   GtkWidget *window = gtk_application_window_new(app);
  53   gtk_window_set_title(GTK_WINDOW(window), "BatteryViewer");
  54   gtk_window_set_default_size(GTK_WINDOW(window), 200, 200);
  55
  56   GtkWidget *box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 1);
  57   gtk_container_add(GTK_CONTAINER(window), box);
  58
  59   struct State *state = (struct State *)user_data;
  60   state->voltage = BV_CHART(bv_chart_new());
  61   bv_chart_add_point(state->voltage, 0.0, 0.0);
  62   bv_chart_add_point(state->voltage, 1.0, 1.0);
  63   bv_chart_add_point(state->voltage, 3.0, 2.0);
  64   gboolean expand = TRUE;
  65   gboolean fill = TRUE;
  66   guint padding = 0;
  67   gtk_box_pack_start(GTK_BOX(box), GTK_WIDGET(state->voltage), expand, fill,
  68                      padding);
  69
  70   state->current = BV_CHART(bv_chart_new());
  71   bv_chart_add_point(state->current, 0.0, 1.0);
  72   bv_chart_add_point(state->current, 1.0, 0.0);
  73   gtk_box_pack_end(GTK_BOX(box), GTK_WIDGET(state->current), expand, fill,
  74                    padding);
  75
  76   gtk_widget_show_all(window);
  77
  78   g_timeout_add_seconds(1, (GSourceFunc)collect_data, user_data);
  79 }
  80
  81 int main(int argc, char **argv) {
  82   struct State state = {
  83       .voltage_filename = "/sys/class/power_supply/BAT0/voltage_now",
  84       .current_filename = "/sys/class/power_supply/BAT0/current_now",
  85   };
  86
  87   GtkApplication *app = gtk_application_new("com.scottworley.batteryviewer",
  88                                             G_APPLICATION_DEFAULT_FLAGS);
  89   g_signal_connect(app, "activate", G_CALLBACK(activate), &state);
  90   int status = g_application_run(G_APPLICATION(app), argc, argv);
  91   g_object_unref(app);
  92
  93   return status;
  94 }