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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libc/] [stdlib/] [gdtoa-hexnan.c] - Blame information for rev 158

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1 148 jeremybenn 
/****************************************************************
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The author of this software is David M. Gay.
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Copyright (C) 2000 by Lucent Technologies
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of Lucent or any of its entities
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not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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THIS SOFTWARE.
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****************************************************************/
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/* Please send bug reports to
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        David M. Gay
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        Bell Laboratories, Room 2C-463
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        600 Mountain Avenue
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        Murray Hill, NJ 07974-0636
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        U.S.A.
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        dmg@bell-labs.com
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 */
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/* Modified 06-21-2006 by Jeff Johnston to work with newlib.  */
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#include <_ansi.h>
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#include <reent.h>
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#include <string.h>
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#include "mprec.h"
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#include "gdtoa.h"
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#ifdef INFNAN_CHECK
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static void
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_DEFUN (L_shift, (x, x1, i),
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        __ULong *x _AND
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        __ULong *x1 _AND
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        int i)
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{
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        int j;
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        i = 8 - i;
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        i <<= 2;
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        j = ULbits - i;
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        do {
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                *x |= x[1] << j;
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                x[1] >>= i;
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                } while(++x < x1);
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}
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int
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_DEFUN (hexnan, (sp, fpi, x0),
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        _CONST char **sp _AND
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        FPI *fpi _AND
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        __ULong *x0)
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{
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        __ULong c, h, *x, *x1, *xe;
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        _CONST char *s;
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        int havedig, hd0, i, nbits;
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        if (!hexdig['0'])
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                hexdig_init();
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        nbits = fpi->nbits;
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        x = x0 + (nbits >> kshift);
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        if (nbits & kmask)
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                x++;
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        *--x = 0;
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        x1 = xe = x;
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        havedig = hd0 = i = 0;
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        s = *sp;
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        while((c = *(_CONST unsigned char*)++s)) {
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                if (!(h = hexdig[c])) {
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                        if (c <= ' ') {
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                                if (hd0 < havedig) {
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                                        if (x < x1 && i < 8)
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                                                L_shift(x, x1, i);
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                                        if (x <= x0) {
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                                                i = 8;
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                                                continue;
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                                                }
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                                        hd0 = havedig;
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                                        *--x = 0;
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                                        x1 = x;
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                                        i = 0;
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                                        }
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                                continue;
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                                }
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                        if (/*(*/ c == ')') {
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                                *sp = s + 1;
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                                break;
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                                }
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                        return STRTOG_NaN;
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                        }
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                havedig++;
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                if (++i > 8) {
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                        if (x <= x0)
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                                continue;
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                        i = 1;
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                        *--x = 0;
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                        }
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                *x = ((*x << 4) | (h & 0xf));
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                }
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        if (!havedig)
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                return STRTOG_NaN;
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        if (x < x1 && i < 8)
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                L_shift(x, x1, i);
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        if (x > x0) {
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                x1 = x0;
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                do *x1++ = *x++;
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                        while(x <= xe);
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                do *x1++ = 0;
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                        while(x1 <= xe);
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                }
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        else {
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                /* truncate high-order word if necessary */
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                if ( (i = nbits & (ULbits-1)) !=0)
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                        *xe &= ((__ULong)0xffffffff) >> (ULbits - i);
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                }
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        for(x1 = xe;; --x1) {
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                if (*x1 != 0)
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                        break;
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                if (x1 == x0) {
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                        *x1 = 1;
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                        break;
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                        }
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                }
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        return STRTOG_NaNbits;
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}
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#endif /* INFNAN_CHECK */

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