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main.c
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main.c
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#include "config.h"
#include <locale.h>
#include <stdlib.h>
#include <signal.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <stdbool.h>
#include <assert.h>
#include <X11/Xlib.h>
#include <sensors/sensors.h>
#include <sensors/error.h>
#include <unistd.h>
struct temperature
{
size_t count;
int* numbers;
sensors_chip_name const* chip;
};
static void signal_handler(int sig);
static size_t print_time(char* buffer, size_t size);
static struct temperature* temperature_init(void);
static void temperature_cleanup(struct temperature* temp);
static double get_temperature(struct temperature* temp);
static sig_atomic_t volatile running = 1;
static void signal_handler(int sig)
{
running = 0;
}
static size_t print_time(char* buffer, size_t size)
{
time_t const raw = time(0);
if (raw == -1)
{
fprintf(stderr, u8"Could not get the current calender time.\n");
return 0;
}
struct tm const* const tm = localtime(&raw);
if (!tm)
{
fprintf(stderr, u8"Could not get the local time.\n");
return 0;
}
return strftime(buffer, size, u8" [%c]", tm);
}
static struct temperature* temperature_init(void)
{
int chip_nr = 0;
struct temperature* temp = 0;
if (sensors_init(0))
{
fprintf(stderr, u8"Could not initialize libsensors.\n");
return 0;
}
temp = calloc(1, sizeof(struct temperature));
if (!temp)
{
fprintf(stderr, u8"Could not allocate memory for temperature struct.\n");
return 0;
}
while ((temp->chip = sensors_get_detected_chips(0, &chip_nr)))
{
if (!strcmp(chip_name, temp->chip->prefix))
{
int feature_nr = 0;
sensors_feature const* feat = 0;
while ((feat = sensors_get_features(temp->chip, &feature_nr)))
{
if (feat->type == SENSORS_FEATURE_TEMP)
{
sensors_subfeature const* sub = sensors_get_subfeature(temp->chip, feat, SENSORS_SUBFEATURE_TEMP_INPUT);
if (!sub)
{
fprintf(stderr, u8"Could not get chip subfeature.\n");
return 0;
}
++temp->count;
temp->numbers = realloc(temp->numbers, temp->count * sizeof(int));
temp->numbers[temp->count - 1] = sub->number;
}
}
return temp;
}
}
return 0;
}
static void temperature_cleanup(struct temperature* temp)
{
if (temp)
{
if (temp->count)
free(temp->numbers);
free(temp);
}
sensors_cleanup();
}
static double get_temperature(struct temperature* temp)
{
assert(temp);
double value = 0.0;
for (size_t i = 0; i < temp->count; ++i)
{
double dummy = 0.0;
int const ret = sensors_get_value(temp->chip, temp->numbers[i], &dummy);
if (ret < 0)
{
fprintf(stderr, u8"Could not get temperature value from subfeature %d.\n", temp->numbers[i]);
}
value = value >= dummy ? value : dummy;
}
return value;
}
static size_t print_temperature(char* buffer, size_t size, struct temperature* temp)
{
int const ret = snprintf(buffer, size, u8"[%.0f°C]", get_temperature(temp));
return ret < 0 ? 0 : (size_t)ret;
}
int main(void)
{
Display* display = 0;
struct temperature* temperature = 0;
int ret = EXIT_FAILURE;
signal(SIGINT, &signal_handler);
signal(SIGTERM, &signal_handler);
setlocale(LC_ALL, u8"");
display = XOpenDisplay(0);
if (!display)
{
fprintf(stderr, u8"Could not open X11 display.\n");
goto cleanup;
}
temperature = temperature_init();
if (!temperature)
{
fprintf(stderr, u8"Could not initialize temperature.\n");
goto cleanup;
}
while (running)
{
char buffer[1024];
char* cur = buffer;
size_t size = sizeof buffer;
size_t check = 0;
check = print_temperature(cur, size, temperature);
size -= check;
cur += check;
check = print_time(cur, size);
size -= check;
cur += check;
XStoreName(display, DefaultRootWindow(display), buffer);
XSync(display, False);
sleep(1);
}
ret = EXIT_SUCCESS;
cleanup:
temperature_cleanup(temperature);
if (display)
XCloseDisplay(display);
return ret;
}