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#ifndef MTOOLS_LLONG_H
#define MTOOLS_LLONG_H
/* Copyright 1999,2001-2004,2007-2009,2021 Alain Knaff.
* This file is part of mtools.
*
* Mtools is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Mtools is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Mtools. If not, see <http://www.gnu.org/licenses/>.
*/
#if 1
#if SIZEOF_OFF_T >= 8
/* if off_t is already 64 bits, be happy, and don't worry about the
* loff_t and llseek stuff */
# define MT_OFF_T off_t
# define SIZEOF_MT_OFF_T SIZEOF_OFF_T
#endif
#ifndef MT_OFF_T
# if defined(HAVE_LSEEK64) && defined (HAVE_OFF64_T)
# define MT_OFF_T off64_t
# define SIZEOF_MT_OFF_T 8
# endif
#endif
#ifndef MT_OFF_T
# if defined(HAVE_LLSEEK) || defined(HAVE_LSEEK64)
/* we have llseek. Now, what's its type called? loff_t or offset_t ? */
# ifdef HAVE_LOFF_T
# define MT_OFF_T loff_t
# define SIZEOF_MT_OFF_T 8
/* use the same type for size. Better to get signedness wrong than width */
# else
# ifdef HAVE_OFFSET_T
# define MT_OFF_T offset_t
# define SIZEOF_MT_OFF_T 8
# endif
# endif
# endif
#endif
#ifndef MT_OFF_T
/* we still don't have a suitable mt_off_t type...*/
# ifdef HAVE_LONG_LONG
/* ... first try long long ... */
# define MT_OFF_T long long
# define SIZEOF_MT_OFF_T 8
# else
/* ... and if that fails, fall back on good ole' off_t, even if that
* only has 32 bits */
# define MT_OFF_T off_t
# define SIZEOF_MT_OFF_T SIZEOF_OFF_T
# endif
#endif
typedef MT_OFF_T mt_off_t;
/* Define a common supertype of uint32_t and mt_off_t. Usually,
* mt_off_t is bigger, except on 32-bit architectures without large
* file support, where uint32_t can represent larger values. N.B. in
* such a setup, negative values of mt_off_t could not be handled, but
* we don't use any such values anyways in mtools
*/
#if SIZEOF_MT_OFF_T == 4
typedef uint32_t smt_off_t;
mt_off_t to_mt_off_t(uint32_t off);
#else
typedef mt_off_t smt_off_t;
#define to_mt_off_t(x) (x)
#endif
#else
/* testing: meant to flag dubious assignments between 32 bit length types
* and 64 bit ones */
typedef struct {
unsigned int lo;
int high;
} *mt_off_t;
#endif
#define min(a,b) ((a) < (b) ? (a) : (b))
#define MAX_OFF_T_B(bits) \
((((mt_off_t) 1 << min(bits-1, sizeof(mt_off_t)*8 - 2)) -1) << 1 | 1)
#if defined(HAVE_LLSEEK) || defined(HAVE_LSEEK64)
# define SEEK_BITS 63
#else
# define SEEK_BITS (sizeof(off_t) * 8 - 1)
#endif
extern const mt_off_t max_off_t_31;
extern const mt_off_t max_off_t_41;
extern const mt_off_t max_off_t_seek;
extern off_t truncBytes32(mt_off_t off); /* truncMtOffToOff */
extern uint32_t truncMtOffTo32u(mt_off_t off);
extern uint32_t truncSizeTo32u(size_t siz);
extern int fileTooBig(mt_off_t off);
int mt_lseek(int fd, mt_off_t where, int whence);
unsigned int log_2(unsigned int);
#endif
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