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| Rev | Author | Line No. | Line |
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| 26 | pmbaty | 1 | /* ucl_ptr.c -- low-level pointer constructs |
| 2 | |||
| 3 | This file is part of the UCL data compression library. |
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| 4 | |||
| 5 | Copyright (C) 1996-2004 Markus Franz Xaver Johannes Oberhumer |
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| 6 | All Rights Reserved. |
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| 7 | |||
| 8 | The UCL library is free software; you can redistribute it and/or |
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| 9 | modify it under the terms of the GNU General Public License as |
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| 10 | published by the Free Software Foundation; either version 2 of |
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| 11 | the License, or (at your option) any later version. |
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| 12 | |||
| 13 | The UCL library is distributed in the hope that it will be useful, |
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 16 | GNU General Public License for more details. |
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| 17 | |||
| 18 | You should have received a copy of the GNU General Public License |
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| 19 | along with the UCL library; see the file COPYING. |
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| 20 | If not, write to the Free Software Foundation, Inc., |
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| 21 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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| 22 | |||
| 23 | Markus F.X.J. Oberhumer |
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| 24 | <markus@oberhumer.com> |
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| 25 | http://www.oberhumer.com/opensource/ucl/ |
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| 26 | */ |
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| 27 | |||
| 28 | |||
| 29 | #include "ucl_conf.h" |
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| 30 | |||
| 31 | |||
| 32 | /*********************************************************************** |
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| 33 | // |
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| 34 | ************************************************************************/ |
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| 35 | |||
| 36 | UCL_PUBLIC(ucl_uintptr_t) |
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| 37 | __ucl_ptr_linear(const ucl_voidp ptr) |
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| 38 | { |
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| 39 | ucl_uintptr_t p; |
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| 40 | |||
| 41 | #if (ACC_OS_DOS16 || ACC_OS_OS216 || ACC_OS_WIN16) |
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| 42 | p = (((ucl_uintptr_t)(ACC_FP_SEG(ptr))) << (16 - ACC_MM_AHSHIFT)) + (ACC_FP_OFF(ptr)); |
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| 43 | #else |
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| 44 | p = PTR_LINEAR(ptr); |
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| 45 | #endif |
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| 46 | |||
| 47 | return p; |
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| 48 | } |
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| 49 | |||
| 50 | |||
| 51 | /*********************************************************************** |
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| 52 | // |
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| 53 | ************************************************************************/ |
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| 54 | |||
| 55 | UCL_PUBLIC(unsigned) |
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| 56 | __ucl_align_gap(const ucl_voidp ptr, ucl_uint size) |
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| 57 | { |
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| 58 | ucl_uintptr_t p, s, n; |
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| 59 | |||
| 60 | assert(size > 0); |
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| 61 | |||
| 62 | p = __ucl_ptr_linear(ptr); |
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| 63 | s = (ucl_uintptr_t) (size - 1); |
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| 64 | #if 0 |
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| 65 | assert((size & (size - 1)) == 0); |
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| 66 | n = ((p + s) & ~s) - p; |
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| 67 | #else |
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| 68 | n = (((p + s) / size) * size) - p; |
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| 69 | #endif |
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| 70 | |||
| 71 | assert((long)n >= 0); |
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| 72 | assert(n <= s); |
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| 73 | |||
| 74 | return (unsigned)n; |
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| 75 | } |
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| 76 | |||
| 77 | |||
| 78 | |||
| 79 | /* |
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| 80 | vi:ts=4:et |
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| 81 | */ |