Implemented creation of root disks

src/utils.c

@@ -7,6 +7,7 @@
 #include <string.h>
 #include <errno.h>
 #include <unistd.h>
+#include <fcntl.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 
@@ -287,3 +288,57 @@ Result read_fd(int fd, char** out_string) {
 
 	return SUCCESS;
 }
+
+Result read_file(const char* path, char** out_string) {
+	*out_string = NULL;
+
+	// Open the file
+	int fd = open(path, O_RDONLY);
+	if (fd == -1) {
+		log_message(LOG_LEVEL_ERROR, "Failed to open the file '%s' (%s).", path, strerror(errno));
+		return FAILURE;
+	}
+
+	// Read the file
+	Result result = read_fd(fd, out_string);
+
+	// Close the file
+	close(fd);
+
+	return result;
+}
+
+Result write_fd(int fd, const char* string) {
+	// Write the string to the file descriptor
+	size_t length = strlen(string);
+	ssize_t bytes_written = 0;
+
+	while (bytes_written < length) {
+		ssize_t result = write(fd, string + bytes_written, length - bytes_written);
+		if (result == -1) {
+			log_message(LOG_LEVEL_ERROR, "Failed to write to the file descriptor (%s).", strerror(errno));
+			return FAILURE;
+		}
+
+		bytes_written += result;
+	}
+
+	return SUCCESS;
+}
+
+Result write_file(const char* path, const char* string) {
+	// Open the file
+	int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+	if (fd == -1) {
+		log_message(LOG_LEVEL_ERROR, "Failed to open the file '%s' (%s).", path, strerror(errno));
+		return FAILURE;
+	}
+
+	// Write the string to the file
+	Result result = write_fd(fd, string);
+
+	// Close the file
+	close(fd);
+
+	return result;
+}