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111 lines
2.8 KiB
111 lines
2.8 KiB
4 months ago
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#ifndef MTOOLS_LLONG_H
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#define MTOOLS_LLONG_H
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/* Copyright 1999,2001-2004,2007-2009 Alain Knaff.
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* This file is part of mtools.
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*
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* Mtools is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Mtools is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Mtools. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if 1
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#ifdef HAVE_OFF_T_64
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/* if off_t is already 64 bits, be happy, and don't worry about the
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* loff_t and llseek stuff */
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# define MT_OFF_T off_t
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# if SIZEOF_SIZE_T == 4
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/* Some systems (NetBSD) apparently have 64 bit off_t, but 32 bit size_t ... */
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# define MT_SIZE_T off_t
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# else
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# define MT_SIZE_T size_t
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# endif
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#endif
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#ifndef MT_OFF_T
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# if defined(HAVE_LLSEEK) || defined(HAVE_LSEEK64)
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/* we have llseek. Now, what's its type called? loff_t or offset_t ? */
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# ifdef HAVE_LOFF_T
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# define MT_OFF_T loff_t
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/* use the same type for size. Better to get signedness wrong than width */
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# define MT_SIZE_T loff_t
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# else
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# ifdef HAVE_OFFSET_T
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# define MT_OFF_T offset_t
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/* use the same type for size. Better to get signedness wrong than width */
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# define MT_SIZE_T offset_t
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# endif
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# endif
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# endif
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#endif
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#ifndef MT_OFF_T
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/* we still don't have a suitable mt_off_t type...*/
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# ifdef HAVE_LONG_LONG
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/* ... first try long long ... */
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# define MT_OFF_T long long
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# define MT_SIZE_T unsigned long long
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# else
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# ifdef HAVE_OFF64_T
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# define MT_OFF_T off64_t
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# define MT_SIZE_T off64_t
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# else
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/* ... and if that fails, fall back on good ole' off_t */
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# define MT_OFF_T off_t
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# define MT_SIZE_T size_t
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# endif
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# endif
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#endif
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typedef MT_OFF_T mt_off_t;
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typedef MT_SIZE_T mt_size_t;
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#else
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/* testing: meant to flag dubious assignments between 32 bit length types
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* and 64 bit ones */
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typedef struct {
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unsigned int lo;
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int high;
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} *mt_off_t;
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typedef struct {
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unsigned int lo;
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unsigned int high;
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} *mt_size_t;
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#endif
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#define min(a,b) ((a) < (b) ? (a) : (b))
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#define MAX_OFF_T_B(bits) \
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((((mt_off_t) 1 << min(bits-1, sizeof(mt_off_t)*8 - 2)) -1) << 1 | 1)
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#if defined(HAVE_LLSEEK) || defined(HAVE_LSEEK64)
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# define SEEK_BITS 63
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#else
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# define SEEK_BITS (sizeof(off_t) * 8 - 1)
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#endif
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extern const mt_off_t max_off_t_31;
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extern const mt_off_t max_off_t_41;
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extern const mt_off_t max_off_t_seek;
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extern off_t truncBytes32(mt_off_t off);
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extern int fileTooBig(mt_off_t off);
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int mt_lseek(int fd, mt_off_t where, int whence);
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unsigned int log_2(int);
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#endif
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