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1 | /*----------------------------------------------------------------------* |
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2 | * File: rxvtutil.C |
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3 | *----------------------------------------------------------------------* |
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4 | * |
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5 | * All portions of code are copyright by their respective author/s. |
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6 | * Copyright (c) 2004-2006 Marc Lehmann <schmorp@schmorp.de> |
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7 | * |
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8 | * This program is free software; you can redistribute it and/or modify |
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9 | * it under the terms of the GNU General Public License as published by |
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10 | * the Free Software Foundation; either version 2 of the License, or |
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11 | * (at your option) any later version. |
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12 | * |
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13 | * This program 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 | * |
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18 | * You should have received a copy of the GNU General Public License |
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19 | * along with this program; if not, write to the Free Software |
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20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 | *----------------------------------------------------------------------*/ |
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22 | |
| 1 | #include <cstdlib> |
23 | #include <cstdlib> |
| 2 | #include <cstring> |
24 | #include <cstring> |
| 3 | #include <inttypes.h> |
25 | #include <inttypes.h> |
| 4 | |
26 | |
| 5 | #include "rxvtutil.h" |
27 | #include "rxvtutil.h" |
| 6 | |
28 | |
| 7 | class byteorder byteorder; |
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| 8 | |
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| 9 | unsigned int byteorder::e; |
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| 10 | |
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| 11 | byteorder::byteorder () |
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| 12 | { |
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| 13 | union { |
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| 14 | uint32_t u; |
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| 15 | uint8_t b[4]; |
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| 16 | } w; |
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| 17 | |
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| 18 | w.b[0] = 0x11; |
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| 19 | w.b[1] = 0x22; |
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| 20 | w.b[2] = 0x33; |
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| 21 | w.b[3] = 0x44; |
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| 22 | |
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| 23 | e = w.u; |
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| 24 | } |
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| 25 | |
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| 26 | #if !HAVE_GCC_BUILTINS |
29 | #if !HAVE_GCC_BUILTINS |
| 27 | int ctz (unsigned int x) CONST |
30 | int rxvt_ctz (unsigned int x) CONST |
| 28 | { |
31 | { |
| 29 | int r = 0; |
32 | int r = 0; |
| 30 | |
33 | |
| 31 | x &= -x; // this isolates the lowest bit |
34 | x &= -x; // this isolates the lowest bit |
| 32 | |
35 | |
| … | |
… | |
| 37 | if (x & 0xffff0000) r += 16; |
40 | if (x & 0xffff0000) r += 16; |
| 38 | |
41 | |
| 39 | return r; |
42 | return r; |
| 40 | } |
43 | } |
| 41 | |
44 | |
| 42 | int popcount (unsigned int x) CONST |
45 | int rxvt_popcount (unsigned int x) CONST |
| 43 | { |
46 | { |
| 44 | x -= (x >> 1) & 0x55555555; |
47 | x -= (x >> 1) & 0x55555555; |
| 45 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
48 | x = ((x >> 2) & 0x33333333) + (x & 0x33333333); |
| 46 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
49 | x = ((x >> 4) + x) & 0x0f0f0f0f; |
| 47 | x *= 0x01010101; |
50 | x *= 0x01010101; |
| … | |
… | |
| 70 | |
73 | |
| 71 | void * |
74 | void * |
| 72 | rxvt_temp_buf (int len) |
75 | rxvt_temp_buf (int len) |
| 73 | { |
76 | { |
| 74 | if (len > temp_len) |
77 | if (len > temp_len) |
| 75 | { |
78 | { |
| 76 | free (temp_buf); |
79 | free (temp_buf); |
| 77 | temp_buf = malloc (len); |
80 | temp_buf = malloc (len); |
| 78 | temp_len = len; |
81 | temp_len = len; |
| 79 | } |
82 | } |
| 80 | |
83 | |
| 81 | return temp_buf; |
84 | return temp_buf; |
| 82 | } |
85 | } |
| 83 | |
86 | |
| 84 | |
87 | |
