projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 9385eb3d A |
1 | /**************************************************************** |
| 2 | ||
| 3 | The author of this software is David M. Gay. | |
| 4 | ||
| 5 | Copyright (C) 1998 by Lucent Technologies | |
| 6 | All Rights Reserved | |
| 7 | ||
| 8 | Permission to use, copy, modify, and distribute this software and | |
| 9 | its documentation for any purpose and without fee is hereby | |
| 10 | granted, provided that the above copyright notice appear in all | |
| 11 | copies and that both that the copyright notice and this | |
| 12 | permission notice and warranty disclaimer appear in supporting | |
| 13 | documentation, and that the name of Lucent or any of its entities | |
| 14 | not be used in advertising or publicity pertaining to | |
| 15 | distribution of the software without specific, written prior | |
| 16 | permission. | |
| 17 | ||
| 18 | LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
| 19 | INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. | |
| 20 | IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY | |
| 21 | SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 22 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER | |
| 23 | IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, | |
| 24 | ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF | |
| 25 | THIS SOFTWARE. | |
| 26 | ||
| 27 | ****************************************************************/ | |
| 28 | ||
| 3d9156a7 A |
29 | /* Please send bug reports to David M. Gay (dmg at acm dot org, |
| 30 | * with " at " changed at "@" and " dot " changed to "."). */ | |
| 9385eb3d A |
31 | |
| 32 | #include "gdtoaimp.h" | |
| 33 | ||
| 34 | void | |
| 35 | #ifdef KR_headers | |
| 36 | rshift(b, k) Bigint *b; int k; | |
| 37 | #else | |
| 38 | rshift(Bigint *b, int k) | |
| 39 | #endif | |
| 40 | { | |
| 41 | ULong *x, *x1, *xe, y; | |
| 42 | int n; | |
| 43 | ||
| 44 | x = x1 = b->x; | |
| 45 | n = k >> kshift; | |
| 46 | if (n < b->wds) { | |
| 47 | xe = x + b->wds; | |
| 48 | x += n; | |
| 49 | if (k &= kmask) { | |
| 50 | n = ULbits - k; | |
| 51 | y = *x++ >> k; | |
| 52 | while(x < xe) { | |
| 53 | *x1++ = (y | (*x << n)) & ALL_ON; | |
| 54 | y = *x++ >> k; | |
| 55 | } | |
| 56 | if ((*x1 = y) !=0) | |
| 57 | x1++; | |
| 58 | } | |
| 59 | else | |
| 60 | while(x < xe) | |
| 61 | *x1++ = *x++; | |
| 62 | } | |
| 63 | if ((b->wds = x1 - b->x) == 0) | |
| 64 | b->x[0] = 0; | |
| 65 | } | |
| 66 | ||
| 67 | int | |
| 68 | #ifdef KR_headers | |
| 69 | trailz(b) Bigint *b; | |
| 70 | #else | |
| 71 | trailz(Bigint *b) | |
| 72 | #endif | |
| 73 | { | |
| 74 | ULong L, *x, *xe; | |
| 75 | int n = 0; | |
| 76 | ||
| 77 | x = b->x; | |
| 78 | xe = x + b->wds; | |
| 79 | for(n = 0; x < xe && !*x; x++) | |
| 80 | n += ULbits; | |
| 81 | if (x < xe) { | |
| 82 | L = *x; | |
| 83 | n += lo0bits(&L); | |
| 84 | } | |
| 85 | return n; | |
| 86 | } |