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Annotation of src/lib/libc/gdtoa/strtorQ.c, Revision 1.5

1.5     ! riastrad    1: /* $NetBSD: strtorQ.c,v 1.4 2011/03/20 23:15:35 christos Exp $ */
1.1       kleink      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:
1.2       kleink     39: /* one or the other of IEEE_BIG_ENDIAN or IEEE_LITTLE_ENDIAN should be #defined */
1.1       kleink     40:
1.2       kleink     41: #ifdef IEEE_BIG_ENDIAN
1.1       kleink     42: #define _0 0
                     43: #define _1 1
                     44: #define _2 2
                     45: #define _3 3
                     46: #endif
1.2       kleink     47: #ifdef IEEE_LITTLE_ENDIAN
1.1       kleink     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
1.4       christos   56: ULtoQ(L, bits, expt, k) ULong *L; ULong *bits; Long expt; int k;
1.1       kleink     57: #else
1.4       christos   58: ULtoQ(ULong *L, ULong *bits, Long expt, int k)
1.1       kleink     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];
1.4       christos   72:                L[_0] = (bits[3] & ~0x10000) | ((expt + 0x3fff + 112) << 16);
1.1       kleink     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: {
1.5     ! riastrad  104:        static CONST FPI fpi0 = { 113, 1-16383-113+1, 32766-16383-113+1, 1, SI };
        !           105:        CONST FPI *fpi;
        !           106:        FPI fpi1;
1.1       kleink    107:        ULong bits[4];
1.4       christos  108:        Long expt;
1.1       kleink    109:        int k;
                    110:
                    111:        fpi = &fpi0;
                    112:        if (rounding != FPI_Round_near) {
                    113:                fpi1 = fpi0;
                    114:                fpi1.rounding = rounding;
                    115:                fpi = &fpi1;
                    116:                }
1.4       christos  117:        k = strtodg(s, sp, fpi, &expt, bits);
1.3       christos  118:        if (k == STRTOG_NoMemory)
                    119:                return k;
1.4       christos  120:        ULtoQ((ULong*)L, bits, expt, k);
1.1       kleink    121:        return k;
                    122:        }

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