fix PIFile::readAll(force = true)

libs/main/io_devices/pifile.cpp

@@ -181,7 +181,7 @@ bool PIFile::openTemporary(PIIODevice::DeviceMode mode) {
 	}
 #else
 	char template_rc[] = "/tmp/pifile_tmp_XXXXXX";
-	int fd = mkstemp(template_rc);
+	int fd             = mkstemp(template_rc);
 	if (fd == -1) return false;
 	::close(fd);
 	tp = template_rc;
@@ -256,8 +256,11 @@ PIByteArray PIFile::readAll(bool forceRead) {
 	llong cp = pos();
 	if (forceRead) {
 		seekToBegin();
-		while (!isEnd())
-			a.push_back(readChar());
+		for (;;) {
+			uchar byte = static_cast<uchar>(fgetc(PRIVATE->fd));
+			if (feof(PRIVATE->fd) || ferror(PRIVATE->fd)) break;
+			a.push_back(byte);
+		}
 		seek(cp);
 		return a;
 	}