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Annotation of researchv10no/cmd/post.src/dpost.utf/font.h, revision 1.1

1.1     ! root        1: /*
        !             2:  *
        !             3:  * Characteristics of a font - for postprocessors. Most changes are for
        !             4:  * Unicode and Plan 9 UTF encoding. Also tried to anticipate larger and
        !             5:  * more general Unicode fonts.
        !             6:  * 
        !             7:  */
        !             8: 
        !             9: #define FIRSTCODE      0x0020
        !            10: #define LASTCODE       0x8BFF
        !            11: #define FIRSTSPECIAL   0xE800
        !            12: #define LASTSPECIAL    0xFDFF
        !            13: 
        !            14: #define INVALIDCODE    0x0000
        !            15: #define LARGESTFONT    0x1000
        !            16: #define MAXFONTS       99
        !            17: #define        SPECIALCHARS    (LASTSPECIAL-FIRSTSPECIAL+1)
        !            18: 
        !            19: #define ValidCode(c)   ((c) >= FIRSTCODE && (c) <= LASTCODE)
        !            20: #define ValidSpecial(c)        ((c) >= FIRSTSPECIAL && (c) <= LASTSPECIAL)
        !            21: #define ValidChar(c)   (ValidCode(c) || ValidSpecial(c))
        !            22: 
        !            23: /*
        !            24:  *
        !            25:  * State of a table entry in fonts[].
        !            26:  *
        !            27:  */
        !            28: 
        !            29: #define NEWFONT                0
        !            30: #define RELEASED       1
        !            31: #define INMEMORY       2
        !            32: 
        !            33: /*
        !            34:  *
        !            35:  * Flags - for setting bits in a font's flag field.
        !            36:  *
        !            37:  */
        !            38: 
        !            39: #define USED           1
        !            40: #define NAMED          2
        !            41: 
        !            42: #define skipline(f)    while ( getc(f) != '\n' )
        !            43: 
        !            44: /*
        !            45:  *
        !            46:  * Data about each character on a font. Omitted the ascender/descender field.
        !            47:  * Need 16 bits for num field to support Unicode character set. Use the same
        !            48:  * for code field which may be translated to Plan 9's UTF represenation on
        !            49:  * output. A string for code field might be worth a try? Needs considerable
        !            50:  * thought!!
        !            51:  *
        !            52:  */
        !            53: 
        !            54: typedef struct {
        !            55:        unsigned short  num;            /* INVALIDCODE means not on this font */
        !            56:        unsigned char   wid;            /* width */
        !            57:        unsigned short  code;           /* code for actual device. */
        !            58: } Chwid;
        !            59: 
        !            60: /*
        !            61:  *
        !            62:  * Font header - one for each available position. first and last fields
        !            63:  * are an attempt to anticipate support for Unicode fonts. Characters
        !            64:  * from first through last are described by the initial last-first+1
        !            65:  * entries in wp. Entries in wp having num == INVALIDCODE are unassigned
        !            66:  * in the font. The remaining nchars-(last-first+1) wp entries support
        !            67:  * troff's traditional two character escapes. Special characters are
        !            68:  * hashed and assigned codes from Unicode's Private Use Area.
        !            69:  *
        !            70:  */
        !            71: 
        !            72: typedef struct {
        !            73:        char            *path;          /* where it came from */
        !            74:        char            *name;          /* as known to troff */
        !            75:        char            *fontname;      /* real name (e.g. Times-Roman) */
        !            76:        char            state;          /* NEWFONT, RELEASED, or INMEMORY */
        !            77:        char            flags;          /* for now just USED and NAMED */
        !            78:        char            mounted;        /* mounted on this many positions */
        !            79:        char            specfont;       /* 1 == special font */
        !            80:        unsigned short  first;          /* first wp entry is for this character */
        !            81:        unsigned short  last;           /* last code for this font */
        !            82:        unsigned short  nchars;         /* size of width table for this font */
        !            83:        Chwid           *wp;            /* widths, etc., of the real characters */
        !            84: } Font;
        !            85: 
        !            86: /*
        !            87:  *
        !            88:  * Non-integer functions.
        !            89:  *
        !            90:  */
        !            91: 
        !            92: extern char    *chname();
        !            93: extern char    *strsave();
        !            94: extern char    *allocate();
        !            95: 

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