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[batteryviewer] / batteryviewer.c
1 // For vasprintf
2 #define _GNU_SOURCE
3
4 #include "chart.h"
5 #include <ctype.h>
6 #include <errno.h>
7 #include <gtk/gtk.h>
8 #include <math.h>
9 #include <stdarg.h>
10 #include <stdio.h>
11 #include <stdlib.h>
12
13 char *sasprintf(const char *fmt, ...) {
14 char *result;
15 va_list args;
16 va_start(args, fmt);
17 if (vasprintf(&result, fmt, args) == -1) {
18 fprintf(stderr, "Can't allocate memory!?\n");
19 abort();
20 }
21 va_end(args);
22 return result;
23 }
24
25 struct State {
26 char *voltage_filename;
27 char *current_filename;
28 BVChart *voltage;
29 BVChart *current;
30 };
31
32 static float fatof(const char *filename) {
33 FILE *f = fopen(filename, "r");
34 if (f == NULL) {
35 return NAN;
36 }
37
38 const int bufsize = 1024;
39 char buf[bufsize];
40 const int read = fread(buf, sizeof(char), bufsize, f);
41 if (read == 0 || read == bufsize || ferror(f)) {
42 fclose(f);
43 return NAN;
44 }
45 fclose(f);
46
47 char *end;
48 errno = 0;
49 float val = strtof(buf, &end);
50 int parsed = end - buf;
51 gboolean parsed_all = parsed == read;
52 gboolean parsed_all_but_space = parsed == read - 1 && isspace(*end);
53 gboolean parse_ok = parsed_all || parsed_all_but_space;
54 if (errno != 0 || parsed == 0 || !parse_ok) {
55 return NAN;
56 }
57 return val;
58 }
59
60 static gboolean collect_data(struct State *state) {
61 fprintf(stderr, "Voltage: %f, current: %f\n", fatof(state->voltage_filename),
62 fatof(state->current_filename));
63 return TRUE;
64 }
65
66 static void activate(GtkApplication *app, gpointer user_data) {
67
68 GtkWidget *window = gtk_application_window_new(app);
69 gtk_window_set_title(GTK_WINDOW(window), "BatteryViewer");
70 gtk_window_set_default_size(GTK_WINDOW(window), 200, 200);
71
72 GtkWidget *box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 1);
73 gtk_container_add(GTK_CONTAINER(window), box);
74
75 struct State *state = (struct State *)user_data;
76 state->voltage = BV_CHART(bv_chart_new());
77 bv_chart_add_point(state->voltage, 0.0, 0.0);
78 bv_chart_add_point(state->voltage, 1.0, 1.0);
79 bv_chart_add_point(state->voltage, 3.0, 2.0);
80 gboolean expand = TRUE;
81 gboolean fill = TRUE;
82 guint padding = 0;
83 gtk_box_pack_start(GTK_BOX(box), GTK_WIDGET(state->voltage), expand, fill,
84 padding);
85
86 state->current = BV_CHART(bv_chart_new());
87 bv_chart_add_point(state->current, 0.0, 1.0);
88 bv_chart_add_point(state->current, 1.0, 0.0);
89 gtk_box_pack_end(GTK_BOX(box), GTK_WIDGET(state->current), expand, fill,
90 padding);
91
92 gtk_widget_show_all(window);
93
94 g_timeout_add_seconds(1, (GSourceFunc)collect_data, user_data);
95 }
96
97 int main(int argc, char **argv) {
98 char *battery_dir = "/sys/class/power_supply/BAT0";
99 struct State state = {
100 .voltage_filename = sasprintf("%s/voltage_now", battery_dir),
101 .current_filename = sasprintf("%s/current_now", battery_dir),
102 };
103
104 GtkApplication *app = gtk_application_new("com.scottworley.batteryviewer",
105 G_APPLICATION_DEFAULT_FLAGS);
106 g_signal_connect(app, "activate", G_CALLBACK(activate), &state);
107 int status = g_application_run(G_APPLICATION(app), argc, argv);
108 g_object_unref(app);
109
110 return status;
111 }