mirror of
https://github.com/cc65/cc65.git
synced 2024-12-24 11:31:31 +00:00
17333e4732
My Git and repositories are configured for POSIX; but sometimes, Windows line endings "sneak" into new files.
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/*
|
|
** Main lightpen driver calibration functions.
|
|
**
|
|
** 2013-07-25, Greg King
|
|
*/
|
|
|
|
|
|
#include <stddef.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <pen.h>
|
|
|
|
|
|
static const char *name;
|
|
|
|
|
|
/* Get a lightpen calibration value from a file if it exists. Otherwise, call
|
|
** pen_calibrate() to create a value; then, write it into a file, so that it
|
|
** will be available at the next time that the lightpen is used.
|
|
** Might change the screen.
|
|
*/
|
|
static void __fastcall__ adjuster (unsigned char *XOffset)
|
|
{
|
|
int fd = open (name, O_RDONLY);
|
|
|
|
if (fd < 0) {
|
|
pen_calibrate (XOffset);
|
|
fd = open (name, O_WRONLY | O_CREAT | O_EXCL);
|
|
if (fd >= 0) {
|
|
(void) write (fd, XOffset, 1);
|
|
close (fd);
|
|
}
|
|
} else {
|
|
(void) read (fd, XOffset, 1);
|
|
close (fd);
|
|
}
|
|
}
|
|
|
|
|
|
/* pen_adjust() is optional; if you want to use its feature,
|
|
** then it must be called before a driver is installed.
|
|
** Note: This function merely saves the file-name pointer, and sets
|
|
** the pen_adjuster pointer. The file will be read only when a driver
|
|
** is installed, and only if that driver wants to be calibrated.
|
|
*/
|
|
void __fastcall__ pen_adjust (const char *filename)
|
|
{
|
|
if (filename != NULL && filename[0] != '\0') {
|
|
name = filename;
|
|
pen_adjuster = adjuster;
|
|
} else {
|
|
pen_adjuster = pen_calibrate;
|
|
}
|
|
}
|