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Annotation of src/lib/libc/gdtoa/strtopxL.c, Revision 1.4

1.4     ! christos    1: /* $NetBSD: strtopxL.c,v 1.3 2006/03/15 17:35:18 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: #endif
1.2       kleink     46: #ifdef IEEE_LITTLE_ENDIAN
1.1       kleink     47: #define _0 2
                     48: #define _1 1
                     49: #define _2 0
                     50: #endif
                     51:
                     52:  int
                     53: #ifdef KR_headers
                     54: strtopxL(s, sp, V) CONST char *s; char **sp; void *V;
                     55: #else
                     56: strtopxL(CONST char *s, char **sp, void *V)
                     57: #endif
                     58: {
1.3       kleink     59:        static CONST FPI fpi = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, SI };
1.1       kleink     60:        ULong bits[2];
1.3       kleink     61:        Long expt;
1.1       kleink     62:        int k;
                     63:        ULong *L = (ULong*)V;
                     64:
1.3       kleink     65:        k = strtodg(s, sp, &fpi, &expt, bits);
1.4     ! christos   66:        if (k == STRTOG_NoMemory)
        !            67:                return k;
1.1       kleink     68:        switch(k & STRTOG_Retmask) {
                     69:          case STRTOG_NoNumber:
                     70:          case STRTOG_Zero:
                     71:                L[0] = L[1] = L[2] = 0;
                     72:                break;
                     73:
                     74:          case STRTOG_Normal:
                     75:          case STRTOG_Denormal:
                     76:          case STRTOG_NaNbits:
                     77:                L[_2] = bits[0];
                     78:                L[_1] = bits[1];
1.3       kleink     79:                L[_0] = (expt + 0x3fff + 63) << 16;
1.1       kleink     80:                break;
                     81:
                     82:          case STRTOG_Infinite:
                     83:                L[_0] = 0x7fff << 16;
                     84:                L[_1] = L[_2] = 0;
                     85:                break;
                     86:
                     87:          case STRTOG_NaN:
                     88:                L[0] = ld_QNAN0;
                     89:                L[1] = ld_QNAN1;
                     90:                L[2] = ld_QNAN2;
                     91:          }
                     92:        if (k & STRTOG_Neg)
                     93:                L[_0] |= 0x80000000L;
                     94:        return k;
                     95:        }

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