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Annotation of 42BSD/bin/as/asnumber.h, revision 1.1

1.1     ! root        1: /*
        !             2:  *     Copyright (c) 1982 Regents of the University of California
        !             3:  *     @(#)asnumber.h 4.3 2/14/82
        !             4:  */
        !             5: 
        !             6: union Ib_int{          /* byte */
        !             7:        u_char  Ib_uchar[1];
        !             8:        char    Ichar;
        !             9: };
        !            10: union Iw_int{          /* word */
        !            11:        u_char  Iw_uchar[2];
        !            12:        u_short Iw_ushort[1];
        !            13:        short   Iw_short;
        !            14: };
        !            15: union Il_int{          /* long word */
        !            16:        u_char  Il_uchar[4];
        !            17:        u_short Il_ushort[2];
        !            18:        u_int   Il_ulong[1];
        !            19:        int     Il_long;
        !            20: };
        !            21: 
        !            22: union Iq_int{          /* quad word */
        !            23:        u_char  Iq_uchar[8];
        !            24:        u_short Iq_ushort[4];
        !            25:        u_int   Iq_ulong[2];
        !            26: };
        !            27: 
        !            28: union Io_int{          /* octal word */
        !            29:        u_char  Io_uchar[16];
        !            30:        u_short Io_ushort[8];
        !            31:        u_int   Io_ulong[4];
        !            32:        union   Iq_int  Io_quad[2];
        !            33: };
        !            34: 
        !            35: union Ff_float{
        !            36:        u_char  Ff_uchar[4];
        !            37:        u_short Ff_ushort[2];
        !            38:        u_int   Ff_ulong[1];
        !            39:        float   Ff_value;
        !            40: };
        !            41: 
        !            42: union Fd_float{
        !            43:        u_char  Fd_uchar[8];
        !            44:        u_short Fd_ushort[4];
        !            45:        u_int   Fd_ulong[2];
        !            46:        double  Fd_value;
        !            47: };
        !            48: 
        !            49: union Fg_float{
        !            50:        u_char  Fg_uchar[8];
        !            51:        u_short Fg_ushort[4];
        !            52:        u_int   Fg_ulong[2];
        !            53: };
        !            54: 
        !            55: union Fh_float{
        !            56:        u_char  Fh_uchar[16];
        !            57:        u_short Fh_ushort[8];
        !            58:        u_int   Fh_ulong[4];
        !            59: };
        !            60: 
        !            61: struct as_number{
        !            62:        union {
        !            63:                union Ib_int    numIb_int;
        !            64:                union Iw_int    numIw_int;
        !            65:                union Il_int    numIl_int;
        !            66:                union Iq_int    numIq_int;
        !            67:                union Io_int    numIo_int;
        !            68:                union Ff_float  numFf_float;
        !            69:                union Fd_float  numFd_float;
        !            70:                union Fg_float  numFg_float;
        !            71:                union Fh_float  numFh_float;
        !            72:        }num_num;
        !            73:        char    num_tag;                /* the key field: TYPB..TYPUNPACKED */
        !            74:        char    num_sign;               /* when unpacked, the sign */
        !            75:        short   num_exponent;           /* when unpacked, the unexcessed exp */
        !            76: };
        !            77: typedef        struct as_number        Bignum;
        !            78: 
        !            79: extern Bignum  Znumber;                /* one all zero'ed out */
        !            80: 
        !            81: #define        num_uchar       num_num.numIq_int.Iq_uchar
        !            82: #define        num_uint        num_num.numIq_int.Iq_ulong
        !            83: #define        num_ulong       num_num.numIq_int.Iq_ulong
        !            84: #define        num_ushort      num_num.numIq_int.Iq_ushort
        !            85: /*
        !            86:  *     The following definitions must all be consistent.
        !            87:  *     They define the granularity of working on longs, quad and octal
        !            88:  *     words. Currently, the granularity is as large as it can be: 32 bits
        !            89:  *     in a chunk.
        !            90:  */
        !            91: #define        CH_N            4               /* number of pieces */
        !            92: #define        CH_BITS         32              /* number of bits per piece */
        !            93: #define        CH_FIELD(x)     ((x).num_num.numIo_int.Io_ulong)
        !            94: typedef        u_int           *chptr;         /* basic data type */
        !            95: #define SIGNBIT                0x80000000
        !            96: 
        !            97: #define        HOC             (CH_N - 1)      /* high order chunk */
        !            98: #if 0
        !            99: #define        MAXINT_1        ((unsigned)(1<<(CH_BITS - 1)))
        !           100: #define        MAXINT_10       ((unsigned)((MAXINT_1/(unsigned)10)))
        !           101: #define        MAXINT_5        ((unsigned)((MAXINT_1/(unsigned)5)))
        !           102: #else not 0
        !           103: /*
        !           104:  *     These values were computed using dc, so are exact.
        !           105:  *     Only MAXINT_10 and MAXINT_5 are used in the programs.
        !           106:  */
        !           107: #define        MAXINT_1        2147483648
        !           108: #define        MAXINT_10       214748364
        !           109: #define        MAXINT_5        429496729
        !           110: #endif not 0
        !           111: 
        !           112: Bignum as_atoi();              /* converts string to integer */
        !           113: Bignum as_atof();              /* converts string to float */
        !           114: Bignum bigatof();              /* converts string to float */
        !           115: Bignum floatconvert(); /* converts amongst float #s */
        !           116: Bignum intconvert();           /* converts amongst float #s */
        !           117: Bignum bignumconvert();        /* converts amongst float #s */
        !           118: Bignum bignumpack();           /* converts UNPACKED bignum to bignum */
        !           119: Bignum bignumunpack(); /* converts bignum to UNPACKED bignum */
        !           120: 
        !           121: /*
        !           122:  *     Definitions for overflows.
        !           123:  */
        !           124: typedef        u_int   Ovf;
        !           125: 
        !           126: #define        OVF_ADDV        (1<<0)  /* integer: adding two vectors overflowed */
        !           127: #define        OVF_LSHIFT      (1<<1)  /* integer: left shifting a vector lost bits */
        !           128: #define        OVF_POSOVF      (1<<2)  /* integer: positive number overflowed */
        !           129: #define        OVF_MAXINT      (1<<3)  /* integer: the number was the maxint + 1*/
        !           130: #define        OVF_F           (1<<4)  /* float: F overflow */
        !           131: #define        OVF_D           (1<<5)  /* float: D overflow */
        !           132: #define        OVF_G           (1<<6)  /* float: G overflow */
        !           133: #define        OVF_H           (1<<7)  /* float: H overflow */
        !           134: #define        OVF_OVERFLOW    (1<<9)  /* overflow in conversion */
        !           135: #define        OVF_UNDERFLOW   (1<<10) /* underflow in conversion */
        !           136: 
        !           137: Ovf    posovf();
        !           138: Ovf    numclear();
        !           139: Ovf    numshift();
        !           140: Ovf    numaddv();
        !           141: Ovf    numaddd();
        !           142: Ovf    num1comp();
        !           143: Ovf    numnegate();
        !           144: 
        !           145: /*
        !           146:  *     Definitions to unpack big numbers numbers into
        !           147:  *     a 128 bit fraction and 16 bit excess-free exponent,
        !           148:  *     and an 8 copy bits for the sign.
        !           149:  *
        !           150:  *     The fraction is represented as a normalized binary number,
        !           151:  *     128 bits long, with the binary point between bits 127 and the
        !           152:  *     hypothetical 128'th bit.  This hypothetical 128'th bit
        !           153:  *     is always assumed to be one.
        !           154:  */
        !           155: /*
        !           156:  *     A map entry is NOTAKE if the corresponding byte is
        !           157:  *     not to be taken
        !           158:  *
        !           159:  *     The maps are for going from packed to unpacked format (b_up)
        !           160:  *     and from unpacked to packed format (b_p)
        !           161:  *     for the mantissa (b_upmmap) and for the exponent(b_upemap)
        !           162:  *
        !           163:  *     byte #i in the packed number goes to byte #b_upmmap[i] in the unpacked
        !           164:  */
        !           165: #define        NOTAKE  -1
        !           166: struct ty_bigdesc{
        !           167:        char    b_upmmap[16];   /* byte x of float goes to up_mmap[x] in mant */
        !           168:        char    b_pmmap[16];    /* inverse of upmmap */
        !           169:        char    b_upemap[2];    /* byte x of float goes to up_emap[x] in exp */
        !           170:        char    b_pemap[2];     /* inverse of upemap */
        !           171:        char    b_mlshift;      /* left shift quantity to justify to left */
        !           172:        char    b_ershift;      /* right shift quantity to r justify exponent */
        !           173:        short   b_msigbits;     /* # sig bits in mantissa */
        !           174:        char    b_esigbits;     /* # sig bits in exponent */
        !           175:        short   b_eexcess;      /* exponent excess */
        !           176: };
        !           177: extern struct ty_bigdesc ty_bigdesc[];
        !           178: /*
        !           179:  *     Bit manipulations
        !           180:  */
        !           181: #define        ONES(n) ((1 << (n)) - 1)
        !           182: /*
        !           183:  *     Assertions
        !           184:  */
        !           185: #if 1
        !           186: #define        assert(x, str) if (!(x)) panic("%s%s\n", "x", str)
        !           187: #else
        !           188: #define assert(x, str)
        !           189: #endif

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