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Annotation of src/lib/libc/gdtoa/strtorQ.c, Revision 1.1

1.1     ! kleink      1: /* $NetBSD$ */
        !             2:
        !             3: /****************************************************************
        !             4:
        !             5: The author of this software is David M. Gay.
        !             6:
        !             7: Copyright (C) 1998, 2000 by Lucent Technologies
        !             8: All Rights Reserved
        !             9:
        !            10: Permission to use, copy, modify, and distribute this software and
        !            11: its documentation for any purpose and without fee is hereby
        !            12: granted, provided that the above copyright notice appear in all
        !            13: copies and that both that the copyright notice and this
        !            14: permission notice and warranty disclaimer appear in supporting
        !            15: documentation, and that the name of Lucent or any of its entities
        !            16: not be used in advertising or publicity pertaining to
        !            17: distribution of the software without specific, written prior
        !            18: permission.
        !            19:
        !            20: LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
        !            21: INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
        !            22: IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
        !            23: SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            24: WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
        !            25: IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
        !            26: ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
        !            27: THIS SOFTWARE.
        !            28:
        !            29: ****************************************************************/
        !            30:
        !            31: /* Please send bug reports to David M. Gay (dmg at acm dot org,
        !            32:  * with " at " changed at "@" and " dot " changed to ".").     */
        !            33:
        !            34: #include "gdtoaimp.h"
        !            35:
        !            36: #undef _0
        !            37: #undef _1
        !            38:
        !            39: /* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */
        !            40:
        !            41: #ifdef IEEE_MC68k
        !            42: #define _0 0
        !            43: #define _1 1
        !            44: #define _2 2
        !            45: #define _3 3
        !            46: #endif
        !            47: #ifdef IEEE_8087
        !            48: #define _0 3
        !            49: #define _1 2
        !            50: #define _2 1
        !            51: #define _3 0
        !            52: #endif
        !            53:
        !            54:  void
        !            55: #ifdef KR_headers
        !            56: ULtoQ(L, bits, exp, k) ULong *L; ULong *bits; Long exp; int k;
        !            57: #else
        !            58: ULtoQ(ULong *L, ULong *bits, Long exp, int k)
        !            59: #endif
        !            60: {
        !            61:        switch(k & STRTOG_Retmask) {
        !            62:          case STRTOG_NoNumber:
        !            63:          case STRTOG_Zero:
        !            64:                L[0] = L[1] = L[2] = L[3] = 0;
        !            65:                break;
        !            66:
        !            67:          case STRTOG_Normal:
        !            68:          case STRTOG_NaNbits:
        !            69:                L[_3] = bits[0];
        !            70:                L[_2] = bits[1];
        !            71:                L[_1] = bits[2];
        !            72:                L[_0] = (bits[3] & ~0x10000) | ((exp + 0x3fff + 112) << 16);
        !            73:                break;
        !            74:
        !            75:          case STRTOG_Denormal:
        !            76:                L[_3] = bits[0];
        !            77:                L[_2] = bits[1];
        !            78:                L[_1] = bits[2];
        !            79:                L[_0] = bits[3];
        !            80:                break;
        !            81:
        !            82:          case STRTOG_Infinite:
        !            83:                L[_0] = 0x7fff0000;
        !            84:                L[_1] = L[_2] = L[_3] = 0;
        !            85:                break;
        !            86:
        !            87:          case STRTOG_NaN:
        !            88:                L[0] = ld_QNAN0;
        !            89:                L[1] = ld_QNAN1;
        !            90:                L[2] = ld_QNAN2;
        !            91:                L[3] = ld_QNAN3;
        !            92:          }
        !            93:        if (k & STRTOG_Neg)
        !            94:                L[_0] |= 0x80000000L;
        !            95:        }
        !            96:
        !            97:  int
        !            98: #ifdef KR_headers
        !            99: strtorQ(s, sp, rounding, L) CONST char *s; char **sp; int rounding; void *L;
        !           100: #else
        !           101: strtorQ(CONST char *s, char **sp, int rounding, void *L)
        !           102: #endif
        !           103: {
        !           104:        static FPI fpi0 = { 113, 1-16383-113+1, 32766-16383-113+1, 1, SI };
        !           105:        FPI *fpi, fpi1;
        !           106:        ULong bits[4];
        !           107:        Long exp;
        !           108:        int k;
        !           109:
        !           110:        fpi = &fpi0;
        !           111:        if (rounding != FPI_Round_near) {
        !           112:                fpi1 = fpi0;
        !           113:                fpi1.rounding = rounding;
        !           114:                fpi = &fpi1;
        !           115:                }
        !           116:        k = strtodg(s, sp, fpi, &exp, bits);
        !           117:        ULtoQ((ULong*)L, bits, exp, k);
        !           118:        return k;
        !           119:        }

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