added the gpio_direction function

main.c

@@ -1,26 +1,24 @@
+// Ignacio Abundez Ortega
+// gpio command tool
+
 #include <stdio.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <string.h>
+
+//prototype functions
+
+int gpio_export(const char *gpio);
+int gpio_direction(int gpio, const char *direction);
+int gpio_write(int gpio, int value);
 
 int main (int argc, char *argv[]){
-	int fd; 
-	// export 
-	fd = open("/sys/class/gpio/chip0/export", O_WRONLY);
-	if (fd < 0){
-		perror("Error opening the GPIO path");
-		return -1;
-	}
-	write(fd,"17", 2);
-	close(fd);
 
+	int fd;
+	char pin[] = "17";	
+	gpio_export(pin);	
+	char direction[] = "out";
 	//pin direction
-	fd = open("/sys/class/gpio/chip0/gpio17/direction", O_WRONLY);
-	if (fd < 0){
-		perror("Error opening the GPIO path");
-		return -1;
-	}
-	write(fd,"out", 3);
-	close(fd);
 
 
 	//pin value
@@ -61,4 +59,38 @@ int main (int argc, char *argv[]){
 	return 0;
 }
 
+//Complete functions
+//
+//gpio_export
+
+int gpio_export(const char *gpio){
+	
+	int fd; 
+	 
+	fd = open("/sys/class/gpio/chip0/export", O_WRONLY);
+	if (fd < 0){
+		perror("Error opening the GPIO path");
+		return -1;
+	}
+	write(fd, gpio, strlen(gpio));
+	close(fd);
+	return(0);
+}
+//pin_directions
+
+int gpio_direction(int gpio, const char *direction){
+
+	int fd;
+
+	fd = open("/sys/class/gpio/chip0/gpio17/direction", O_WRONLY);
+	if (fd < 0){
+		perror("Error opening the GPIO path");
+		return -1;
+	}
+	write(fd, direction, 3);
+	close(fd);
+	return (0);
+}
+//pin_value
+