mirror of https://git.tukaani.org/xz.git
198 lines
5.1 KiB
C
198 lines
5.1 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file sysdefs.h
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/// \brief Common includes, definitions, system-specific things etc.
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///
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/// This file is used also by the lzma command line tool, that's why this
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/// file is separate from common.h.
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//
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// Author: Lasse Collin
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef LZMA_SYSDEFS_H
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#define LZMA_SYSDEFS_H
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//////////////
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// Includes //
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//////////////
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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// This #define ensures that C99 and POSIX compliant stdio functions are
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// available with MinGW-w64 (both 32-bit and 64-bit). Modern MinGW-w64 adds
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// this automatically, for example, when the compiler is in C99 (or later)
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// mode when building against msvcrt.dll. It still doesn't hurt to be explicit
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// that we always want this and #define this unconditionally.
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//
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// With Universal CRT (UCRT) this is less important because UCRT contains
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// C99-compatible stdio functions. It's still nice to #define this as UCRT
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// doesn't support the POSIX thousand separator flag in printf (like "%'u").
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#ifdef __MINGW32__
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# define __USE_MINGW_ANSI_STDIO 1
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#endif
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// size_t and NULL
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#include <stddef.h>
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#ifdef HAVE_INTTYPES_H
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# include <inttypes.h>
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#endif
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// C99 says that inttypes.h always includes stdint.h, but some systems
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// don't do that, and require including stdint.h separately.
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#ifdef HAVE_STDINT_H
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# include <stdint.h>
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#endif
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// Some pre-C99 systems have SIZE_MAX in limits.h instead of stdint.h. The
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// limits are also used to figure out some macros missing from pre-C99 systems.
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#include <limits.h>
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// Be more compatible with systems that have non-conforming inttypes.h.
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// We assume that int is 32-bit and that long is either 32-bit or 64-bit.
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// Full Autoconf test could be more correct, but this should work well enough.
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// Note that this duplicates some code from lzma.h, but this is better since
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// we can work without inttypes.h thanks to Autoconf tests.
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#ifndef UINT32_C
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# if UINT_MAX != 4294967295U
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# error UINT32_C is not defined and unsigned int is not 32-bit.
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# endif
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# define UINT32_C(n) n ## U
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#endif
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#ifndef UINT32_MAX
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# define UINT32_MAX UINT32_C(4294967295)
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#endif
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#ifndef PRIu32
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# define PRIu32 "u"
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#endif
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#ifndef PRIx32
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# define PRIx32 "x"
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#endif
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#ifndef PRIX32
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# define PRIX32 "X"
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#endif
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#if ULONG_MAX == 4294967295UL
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# ifndef UINT64_C
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# define UINT64_C(n) n ## ULL
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# endif
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# ifndef PRIu64
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# define PRIu64 "llu"
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# endif
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# ifndef PRIx64
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# define PRIx64 "llx"
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# endif
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# ifndef PRIX64
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# define PRIX64 "llX"
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# endif
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#else
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# ifndef UINT64_C
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# define UINT64_C(n) n ## UL
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# endif
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# ifndef PRIu64
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# define PRIu64 "lu"
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# endif
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# ifndef PRIx64
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# define PRIx64 "lx"
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# endif
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# ifndef PRIX64
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# define PRIX64 "lX"
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# endif
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#endif
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#ifndef UINT64_MAX
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# define UINT64_MAX UINT64_C(18446744073709551615)
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#endif
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// Incorrect(?) SIZE_MAX:
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// - Interix headers typedef size_t to unsigned long,
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// but a few lines later define SIZE_MAX to INT32_MAX.
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// - SCO OpenServer (x86) headers typedef size_t to unsigned int
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// but define SIZE_MAX to INT32_MAX.
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#if defined(__INTERIX) || defined(_SCO_DS)
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# undef SIZE_MAX
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#endif
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// The code currently assumes that size_t is either 32-bit or 64-bit.
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#ifndef SIZE_MAX
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# if SIZEOF_SIZE_T == 4
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# define SIZE_MAX UINT32_MAX
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# elif SIZEOF_SIZE_T == 8
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# define SIZE_MAX UINT64_MAX
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# else
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# error size_t is not 32-bit or 64-bit
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# endif
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#endif
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#if SIZE_MAX != UINT32_MAX && SIZE_MAX != UINT64_MAX
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# error size_t is not 32-bit or 64-bit
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#endif
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#include <stdlib.h>
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#include <assert.h>
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// Pre-C99 systems lack stdbool.h. All the code in XZ Utils must be written
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// so that it works with fake bool type, for example:
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//
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// bool foo = (flags & 0x100) != 0;
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// bool bar = !!(flags & 0x100);
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//
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// This works with the real C99 bool but breaks with fake bool:
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//
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// bool baz = (flags & 0x100);
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//
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#ifdef HAVE_STDBOOL_H
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# include <stdbool.h>
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#else
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# if ! HAVE__BOOL
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typedef unsigned char _Bool;
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# endif
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# define bool _Bool
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# define false 0
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# define true 1
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# define __bool_true_false_are_defined 1
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#endif
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#include <string.h>
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// As of MSVC 2013, inline and restrict are supported with
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// non-standard keywords.
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#if defined(_WIN32) && defined(_MSC_VER)
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# ifndef inline
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# define inline __inline
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# endif
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# ifndef restrict
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# define restrict __restrict
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# endif
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#endif
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////////////
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// Macros //
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////////////
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#undef memzero
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#define memzero(s, n) memset(s, 0, n)
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// NOTE: Avoid using MIN() and MAX(), because even conditionally defining
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// those macros can cause some portability trouble, since on some systems
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// the system headers insist defining their own versions.
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#define my_min(x, y) ((x) < (y) ? (x) : (y))
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#define my_max(x, y) ((x) > (y) ? (x) : (y))
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#ifndef ARRAY_SIZE
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# define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0]))
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#endif
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#if defined(__GNUC__) \
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&& ((__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4)
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# define lzma_attr_alloc_size(x) __attribute__((__alloc_size__(x)))
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#else
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# define lzma_attr_alloc_size(x)
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#endif
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#endif
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