#include <stdio.h>
	#include <dirent.h>
	#include <string.h>
	#include <fcntl.h>
	#include <stdlib.h>
	#include <unistd.h>

	int main(void) {
		DIR *dir;
		struct dirent *dirent;
		char dev[16];      // Dev ID
		char devPath[128]; // Path to device
		char buf[256];     // Data from device
		char tmpData[6];   // Temp C * 1000 reported by device
		char path[] = "/sys/bus/w1/devices";
		ssize_t numRead;

		//tentative de lecture du dossier contenant le fichier dev, celui cmmence par 28-
		dir = opendir(path);
		if (dir != NULL)
		{
			while ((dirent = readdir(dir)))
			 // 1-wire devices are links beginning with 28-
				if (dirent->d_type == DT_LNK &&
				  strstr(dirent->d_name, "28-") != NULL) {
					strcpy(dev, dirent->d_name);
					printf("\nDevice: %s\n", dev);

				}
			(void) closedir(dir);

		}
		else
		{
			perror("Couldn't open the w1 devices directory");
			return 1;
		}


		//On va écrire dans devpath   /sys/bus/w1/devices/28-xxxxxxxxxx/w1_slave
		sprintf(devPath, "%s/%s/w1_slave", path, dev);
		// Read temp continuously
		// On va lire le contenu du fichier ( la température) par groupe de 4 bytes
		while (1) {
			int fd = open(devPath, O_RDONLY);
			if (fd == -1)
			{
				perror("Couldn't open the w1 device.");
				return 1;
			}
			while ((numRead = read(fd, buf, 256)) > 0)
			{
				strncpy(tmpData, strstr(buf, "t=") + 2, 5);
				//convertit en float
				float tempC = strtof(tmpData, NULL);
				//nom du device
				printf("Device: %s  - ", dev);
				//température en celius
				printf("Temp: %.3f C  ", tempC / 1000);
				//température en fareneit
				printf("%.3f F\n\n", (tempC / 1000) * 9 / 5 + 32);
			}
			close(fd);
		}
			   // return 0; --never called due to loop

	}