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/* Copyright (c) 1987 Regents of the University of California */ |
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|
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/* SCCSid "$SunId$ LBL" */ |
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|
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/* |
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* driver.h - header file for interactive device drivers. |
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* |
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* 2/2/87 |
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*/ |
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|
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struct driver { /* driver functions */ |
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int (*close)(); /* close device */ |
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int (*clear)(); /* clear device */ |
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int (*paintr)(); /* paint rectangle */ |
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int (*getcur)(); /* get cursor position */ |
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int (*comout)(); /* command line output */ |
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int (*comin)(); /* command line input */ |
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int (*flush)(); /* flush output */ |
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double pixaspect; /* pixel aspect ratio */ |
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int xsiz, ysiz; /* device size */ |
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int inpready; /* input ready on device */ |
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}; |
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/* stream interface */ |
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extern struct driver *comm_init(), *slave_init(); |
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/* magic numbers for verification */ |
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#define COM_SENDM 0x6f37 |
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#define COM_RECVM 0x51da |
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/* stream commands */ |
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#define COM_CLEAR 0 |
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#define COM_PAINTR 1 |
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#define COM_GETCUR 2 |
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#define COM_COMOUT 3 |
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#define COM_COMIN 4 |
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#define COM_FLUSH 5 |
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#define NREQUESTS 6 /* number of valid requests */ |
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|
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extern struct device { /* interactive device */ |
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char *name; /* device name */ |
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char *descrip; /* description */ |
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struct driver *(*init)(); /* initialize device */ |
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} devtable[]; /* supported devices */ |
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|
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extern char dev_default[]; /* default device name */ |
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|
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#define MB1 ('\n') /* mouse button 1 */ |
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#define MB2 ('\r') /* mouse button 2 */ |
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#define MB3 (' ') /* mouse button 3 */ |
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#define ABORT ('C'-'@') /* abort key */ |
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|
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/* |
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* struct driver * |
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* dname_init(name, id) |
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* char *name, *id; |
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* { |
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* Initialize device and return pointer to driver |
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* functions. Returns NULL if an error occurred. |
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* The name string identifies the driver, |
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* and the id string identifies the client. |
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* A device can be open by at most one client. |
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* Be verbose in error reports; call eputs(). |
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* If device has its own error output, set erract. |
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* } |
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* (*dev->close)() |
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* { |
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* Close the device. Reset error vectors. |
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* } |
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* (*dev->clear)(xres, yres) |
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* int xres, yres; |
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* { |
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* Clear the device for xres by yres output. This call will |
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* be made prior to any output. |
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* } |
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* (*dev->paintr)(col, xmin, ymin, xmax, ymax) |
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* COLOR col; |
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* int xmin, ymin, xmax, ymax; |
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* { |
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* Paint a half-open rectangle from (xmin,ymin) to (xmax,ymax) |
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* with the color col. |
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* } |
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* (*dev->getcur)(xp, yp) |
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* int *xp, *yp; |
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* { |
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* Get the cursor position entered by the user via mouse, |
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* joystick, etc. Return the key hit by the user (usually |
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* MB1 or MB2). Return ABORT to cancel. |
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* Can be NULL for devices without this capability. |
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* } |
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* (*dev->comout)(out) |
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* char *out; |
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* { |
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* Print the string out on the device command line. If the |
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* string ends with '\n', the message is considered complete, |
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* and the next call can erase it. |
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* } |
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* (*dev->comin)(in, prompt) |
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* char *in, *prompt; |
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* { |
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* Print a prompt then read an edited input command line |
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* assuming the in buffer is big enough. Unless prompt is NULL, |
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* the driver may substitute its own rview command. This is |
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* the most reliable way to repaint areas of the screen. |
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* If the user enters an unrecognized control character, |
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* terminate input and return the string with only that character. |
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* The input string should not contain a newline. The routines in |
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* editline.c may be useful. Comin must work in consort with comout. |
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* } |
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* (*dev->flush)() |
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* { |
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* Flush output to the display. This is guaranteed to be called |
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* frequently enough to keep the display up to date. |
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* This is an ideal time to check for device input. |
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* This function can be NULL for devices that don't need it. |
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* } |
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* xsiz, ysiz |
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* The maximum allowable x and y dimensions. If any |
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* size is allowable, these should be set to MAXRES. |
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* inpready |
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* This variable should be made positive asynchronously |
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* when characters are ready on the input. (Often easiest |
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* to check for input during calls to paintr.) |
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*/ |
