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Annotation of src/lib/libc/gdtoa/strtorx.c, Revision 1.3

1.3     ! christos    1: /* $NetBSD: strtorx.c,v 1.2 2006/01/25 15:27:42 kleink 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: #define _4 4
                     47: #endif
1.2       kleink     48: #ifdef IEEE_LITTLE_ENDIAN
1.1       kleink     49: #define _0 4
                     50: #define _1 3
                     51: #define _2 2
                     52: #define _3 1
                     53: #define _4 0
                     54: #endif
                     55:
                     56:  void
                     57: #ifdef KR_headers
                     58: ULtox(L, bits, exp, k) UShort *L; ULong *bits; Long exp; int k;
                     59: #else
                     60: ULtox(UShort *L, ULong *bits, Long exp, int k)
                     61: #endif
                     62: {
                     63:        switch(k & STRTOG_Retmask) {
                     64:          case STRTOG_NoNumber:
                     65:          case STRTOG_Zero:
                     66:                L[0] = L[1] = L[2] = L[3] = L[4] = 0;
                     67:                break;
                     68:
                     69:          case STRTOG_Denormal:
                     70:                L[_0] = 0;
                     71:                goto normal_bits;
                     72:
                     73:          case STRTOG_Normal:
                     74:          case STRTOG_NaNbits:
                     75:                L[_0] = exp + 0x3fff + 63;
                     76:  normal_bits:
                     77:                L[_4] = (UShort)bits[0];
                     78:                L[_3] = (UShort)(bits[0] >> 16);
                     79:                L[_2] = (UShort)bits[1];
                     80:                L[_1] = (UShort)(bits[1] >> 16);
                     81:                break;
                     82:
                     83:          case STRTOG_Infinite:
                     84:                L[_0] = 0x7fff;
                     85:                L[_1] = L[_2] = L[_3] = L[_4] = 0;
                     86:                break;
                     87:
                     88:          case STRTOG_NaN:
                     89:                L[0] = ldus_QNAN0;
                     90:                L[1] = ldus_QNAN1;
                     91:                L[2] = ldus_QNAN2;
                     92:                L[3] = ldus_QNAN3;
                     93:                L[4] = ldus_QNAN4;
                     94:          }
                     95:        if (k & STRTOG_Neg)
                     96:                L[_0] |= 0x8000;
                     97:        }
                     98:
                     99:  int
                    100: #ifdef KR_headers
                    101: strtorx(s, sp, rounding, L) CONST char *s; char **sp; int rounding; void *L;
                    102: #else
                    103: strtorx(CONST char *s, char **sp, int rounding, void *L)
                    104: #endif
                    105: {
                    106:        static FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, SI };
                    107:        FPI *fpi, fpi1;
                    108:        ULong bits[2];
                    109:        Long exp;
                    110:        int k;
                    111:
                    112:        fpi = &fpi0;
                    113:        if (rounding != FPI_Round_near) {
                    114:                fpi1 = fpi0;
                    115:                fpi1.rounding = rounding;
                    116:                fpi = &fpi1;
                    117:                }
                    118:        k = strtodg(s, sp, fpi, &exp, bits);
1.3     ! christos  119:        if (k == STRTOG_NoMemory)
        !           120:                return k;
1.1       kleink    121:        ULtox((UShort*)L, bits, exp, k);
                    122:        return k;
                    123:        }

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