postdaisy.h

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

/*
 *
 * Definitions used by the PostScript translator for Diablo 1640 files.
 *
 * Diablo printers have horizontal and vertical resolutions of 120 and 48 dpi.
 * We'll use a single resolution of 240 dpi and let the program scale horizontal
 * and vertical positions by HSCALE and VSCALE.
 *
 */

#define RES		240
#define HSCALE		2
#define VSCALE		5

/*
 *
 * HMI is the default character spacing and VMI is the line spacing. Both values
 * are in terms of the 240 dpi resolution.
 *
 */

#define HMI		(12 * HSCALE)
#define VMI		(8 * VSCALE)

/*
 *
 * Paper dimensions don't seem to be all that important. They're just used to
 * set the right and bottom margins. Both are given in terms of the 240 dpi
 * resolution.
 *
 */

#define LEFTMARGIN	0
#define RIGHTMARGIN	3168
#define TOPMARGIN	0
#define BOTTOMMARGIN	2640

/*
 *
 * ROWS and COLUMNS set the dimensions of the horizontal and vertical tab arrays.
 * The way I've implemented both kinds of tabs leaves something to be desired, but
 * it was simple and should be good enough for now. If arrays are going to be used
 * to mark tab stops I probably should use malloc() to get enough space once the
 * initial hmi and vmi are know.
 *
 */

#define ROWS		400
#define COLUMNS		200

/*
 *
 * An array of type Fontmap helps convert font names requested by users into
 * legitimate PostScript names. The array is initialized using FONTMAP, which must
 * end with an entry that has NULL defined as its name field.
 *
 */

typedef struct {
	char	*name;			/* user's font name */
	char	*val;			/* corresponding PostScript name */
} Fontmap;

#define FONTMAP								\
									\
	{								\
	    "R", "Courier",						\
	    "I", "Courier-Oblique",					\
	    "B", "Courier-Bold",					\
	    "CO", "Courier",						\
	    "CI", "Courier-Oblique",					\
	    "CB", "Courier-Bold",					\
	    "CW", "Courier",						\
	    "PO", "Courier",						\
	    "courier", "Courier",					\
	    "cour", "Courier",						\
	    "co", "Courier",						\
	    NULL, NULL							\
	}

/*
 *
 * Some of the non-integer functions in postdaisy.c.
 *
 */

char	*get_font();