1 #ifndef MTOOLS_LLONG_H 2 #define MTOOLS_LLONG_H 3 4 /* Copyright 1999,2001-2004,2007-2009,2021 Alain Knaff. 5 * This file is part of mtools. 6 * 7 * Mtools is free software: you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation, either version 3 of the License, or 10 * (at your option) any later version. 11 * 12 * Mtools is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with Mtools. If not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #if 1 22 23 24 #if SIZEOF_OFF_T >= 8 25 /* if off_t is already 64 bits, be happy, and don't worry about the 26 * loff_t and llseek stuff */ 27 # define MT_OFF_T off_t 28 # define SIZEOF_MT_OFF_T SIZEOF_OFF_T 29 #endif 30 31 #ifndef MT_OFF_T 32 # if defined(HAVE_LSEEK64) && defined (HAVE_OFF64_T) 33 # define MT_OFF_T off64_t 34 # define SIZEOF_MT_OFF_T 8 35 # endif 36 #endif 37 38 39 #ifndef MT_OFF_T 40 # if defined(HAVE_LLSEEK) || defined(HAVE_LSEEK64) 41 /* we have llseek. Now, what's its type called? loff_t or offset_t ? */ 42 # ifdef HAVE_LOFF_T 43 # define MT_OFF_T loff_t 44 # define SIZEOF_MT_OFF_T 8 45 /* use the same type for size. Better to get signedness wrong than width */ 46 # else 47 # ifdef HAVE_OFFSET_T 48 # define MT_OFF_T offset_t 49 # define SIZEOF_MT_OFF_T 8 50 # endif 51 # endif 52 # endif 53 #endif 54 55 #ifndef MT_OFF_T 56 /* we still don't have a suitable mt_off_t type...*/ 57 # ifdef HAVE_LONG_LONG 58 /* ... first try long long ... */ 59 # define MT_OFF_T long long 60 # define SIZEOF_MT_OFF_T 8 61 # else 62 /* ... and if that fails, fall back on good ole' off_t, even if that 63 * only has 32 bits */ 64 # define MT_OFF_T off_t 65 # define SIZEOF_MT_OFF_T SIZEOF_OFF_T 66 # endif 67 #endif 68 69 typedef MT_OFF_T mt_off_t; 70 71 /* Define a common supertype of uint32_t and mt_off_t. Usually, 72 * mt_off_t is bigger, except on 32-bit architectures without large 73 * file support, where uint32_t can represent larger values. N.B. in 74 * such a setup, negative values of mt_off_t could not be handled, but 75 * we don't use any such values anyways in mtools 76 */ 77 #if SIZEOF_MT_OFF_T == 4 78 79 typedef uint32_t smt_off_t; 80 mt_off_t to_mt_off_t(uint32_t off); 81 82 #else 83 84 typedef mt_off_t smt_off_t; 85 #define to_mt_off_t(x) (x) 86 87 #endif 88 89 #else 90 /* testing: meant to flag dubious assignments between 32 bit length types 91 * and 64 bit ones */ 92 typedef struct { 93 unsigned int lo; 94 int high; 95 } *mt_off_t; 96 97 #endif 98 99 #define min(a,b) ((a) < (b) ? (a) : (b)) 100 #define MAX_OFF_T_B(bits) \ 101 ((((mt_off_t) 1 << min(bits-1, sizeof(mt_off_t)*8 - 2)) -1) << 1 | 1) 102 103 #if defined(HAVE_LLSEEK) || defined(HAVE_LSEEK64) 104 # define SEEK_BITS 63 105 #else 106 # define SEEK_BITS (sizeof(off_t) * 8 - 1) 107 #endif 108 109 extern const mt_off_t max_off_t_31; 110 extern const mt_off_t max_off_t_41; 111 extern const mt_off_t max_off_t_seek; 112 113 extern off_t truncBytes32(mt_off_t off); /* truncMtOffToOff */ 114 extern uint32_t truncMtOffTo32u(mt_off_t off); 115 extern uint32_t truncSizeTo32u(size_t siz); 116 extern int fileTooBig(mt_off_t off); 117 118 int mt_lseek(int fd, mt_off_t where, int whence); 119 120 unsigned int log_2(unsigned int); 121 122 #endif 123