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Diffstat (limited to 'llong.h')
| -rw-r--r-- | llong.h | 110 |
1 files changed, 110 insertions, 0 deletions
@@ -0,0 +1,110 @@ +#ifndef MTOOLS_LLONG_H +#define MTOOLS_LLONG_H + +/* Copyright 1999,2001-2004,2007-2009 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 + + +#ifdef HAVE_OFF_T_64 +/* 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 +# if SIZEOF_SIZE_T == 4 +/* Some systems (NetBSD) apparently have 64 bit off_t, but 32 bit size_t ... */ +# define MT_SIZE_T off_t +# else +# define MT_SIZE_T size_t +# 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 +/* use the same type for size. Better to get signedness wrong than width */ +# define MT_SIZE_T loff_t +# else +# ifdef HAVE_OFFSET_T +# define MT_OFF_T offset_t +/* use the same type for size. Better to get signedness wrong than width */ +# define MT_SIZE_T offset_t +# 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 MT_SIZE_T unsigned long long +# else +# ifdef HAVE_OFF64_T +# define MT_OFF_T off64_t +# define MT_SIZE_T off64_t +# else +/* ... and if that fails, fall back on good ole' off_t */ +# define MT_OFF_T off_t +# define MT_SIZE_T size_t +# endif +# endif +#endif + +typedef MT_OFF_T mt_off_t; +typedef MT_SIZE_T mt_size_t; + +#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; + +typedef struct { + unsigned int lo; + unsigned int high; +} *mt_size_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); +extern int fileTooBig(mt_off_t off); + +int mt_lseek(int fd, mt_off_t where, int whence); + +unsigned int log_2(int); + +#endif |