--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/freeglut/src/x11/fg_input_devices_x11.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,123 @@
+/*
+ * fg_input_devices_x11.c
+ *
+ * Handles miscellaneous input devices via direct serial-port access.
+ * Proper X11 XInput device support is not yet supported.
+ * Also lacks Mac support.
+ *
+ * Written by Joe Krahn <krahn@niehs.nih.gov> 2005
+ *
+ * Copyright (c) 2005 Stephen J. Baker. All Rights Reserved.
+ * Copied for Platform code by Evan Felix <karcaw at gmail.com>
+ * Creation date: Thur Feb 2 2012
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * PAWEL W. OLSZTA OR STEPHEN J. BAKER BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <GL/freeglut.h>
+#include "../fg_internal.h"
+
+#include <errno.h>
+#include <sys/ioctl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <fcntl.h>
+
+struct _serialport {
+   int fd;
+   struct termios termio, termio_save;
+};
+
+typedef struct _serialport SERIALPORT;
+
+void serial_flush ( SERIALPORT *port );
+
+/*****************************************************************/
+
+/*
+ * Try initializing the input device(s)
+ */
+void fgPlatformRegisterDialDevice ( const char *dial_device )
+{
+}
+
+SERIALPORT *serial_open ( const char *device )
+{
+    int fd;
+    struct termios termio;
+    SERIALPORT *port;
+
+    fd = open(device, O_RDWR | O_NONBLOCK );
+    if (fd <0) {
+        perror(device);
+        return NULL;
+    }
+
+    port = malloc(sizeof(SERIALPORT));
+    memset(port, 0, sizeof(SERIALPORT));
+    port->fd = fd;
+
+    /* save current port settings */
+    tcgetattr(fd,&port->termio_save);
+
+    memset(&termio, 0, sizeof(termio));
+    termio.c_cflag = CS8 | CREAD | HUPCL ;
+    termio.c_iflag = IGNPAR | IGNBRK ;
+    termio.c_cc[VTIME]    = 0;   /* inter-character timer */
+    termio.c_cc[VMIN]     = 1;   /* block read until 1 chars received, when blocking I/O */
+
+    cfsetispeed(&termio, B9600);
+    cfsetospeed(&termio, B9600);
+    tcsetattr(fd,TCSANOW,&termio);
+
+    serial_flush(port);
+    return port;
+}
+
+void serial_close(SERIALPORT *port)
+{
+    if (port)
+    {
+        /* restore old port settings */
+        tcsetattr(port->fd,TCSANOW,&port->termio_save);
+        close(port->fd);
+        free(port);
+    }
+}
+
+int serial_getchar(SERIALPORT *port)
+{
+    unsigned char ch;
+    if (!port) return EOF;
+    if (read(port->fd,&ch,1)) return ch;
+    return EOF;
+}
+
+int serial_putchar(SERIALPORT *port, unsigned char ch)
+{
+    if (!port) return 0;
+    return write(port->fd,&ch,1);
+}
+
+void serial_flush ( SERIALPORT *port )
+{
+    tcflush ( port->fd, TCIOFLUSH );
+}