diff options
Diffstat (limited to 'src/common/sysdefs.h')
| -rw-r--r-- | src/common/sysdefs.h | 42 |
1 files changed, 38 insertions, 4 deletions
diff --git a/src/common/sysdefs.h b/src/common/sysdefs.h index 2c7fb6ff..7f935f67 100644 --- a/src/common/sysdefs.h +++ b/src/common/sysdefs.h @@ -31,12 +31,21 @@ # include <config.h> #endif -#include <sys/types.h> +// size_t and NULL +#include <stddef.h> #ifdef HAVE_INTTYPES_H # include <inttypes.h> #endif +// C99 says that inttypes.h always includes stdint.h, but some systems +// don't do that, and require including stdint.h separately. +#ifdef HAVE_STDINT_H +# include <stdint.h> +#endif + +// Some pre-C99 systems have SIZE_MAX in limits.h instead of stdint.h. The +// limits are also used to figure out some macros missing from pre-C99 systems. #ifdef HAVE_LIMITS_H # include <limits.h> #endif @@ -44,7 +53,12 @@ // Be more compatible with systems that have non-conforming inttypes.h. // We assume that int is 32-bit and that long is either 32-bit or 64-bit. // Full Autoconf test could be more correct, but this should work well enough. +// Note that this duplicates some code from lzma.h, but this is better since +// we can work without inttypes.h thanks to Autoconf tests. #ifndef UINT32_C +# if UINT_MAX != 4294967295U +# error UINT32_C is not defined and unsiged int is not 32-bit. +# endif # define UINT32_C(n) n ## U #endif #ifndef UINT32_MAX @@ -56,7 +70,8 @@ #ifndef PRIX32 # define PRIX32 "X" #endif -#if SIZEOF_UNSIGNED_LONG == 4 + +#if ULONG_MAX == 4294967295UL # ifndef UINT64_C # define UINT64_C(n) n ## ULL # endif @@ -80,16 +95,33 @@ #ifndef UINT64_MAX # define UINT64_MAX UINT64_C(18446744073709551615) #endif + +// The code currently assumes that size_t is either 32-bit or 64-bit. #ifndef SIZE_MAX # if SIZEOF_SIZE_T == 4 # define SIZE_MAX UINT32_MAX -# else +# elif SIZEOF_SIZE_T == 8 # define SIZE_MAX UINT64_MAX +# else +# error sizeof(size_t) is not 32-bit or 64-bit # endif #endif +#if SIZE_MAX != UINT32_MAX && SIZE_MAX != UINT64_MAX +# error sizeof(size_t) is not 32-bit or 64-bit +#endif #include <stdlib.h> +// Pre-C99 systems lack stdbool.h. All the code in LZMA Utils must be written +// so that it works with fake bool type, for example: +// +// bool foo = (flags & 0x100) != 0; +// bool bar = !!(flags & 0x100); +// +// This works with the real C99 bool but breaks with fake bool: +// +// bool baz = (flags & 0x100); +// #ifdef HAVE_STDBOOL_H # include <stdbool.h> #else @@ -108,11 +140,13 @@ typedef unsigned char _Bool; # ifdef NDEBUG # define assert(x) # else - // TODO: Pretty bad assert() macro. + // TODO: Pretty bad assert macro. # define assert(x) (!(x) && abort()) # endif #endif +// string.h should be enough but let's include strings.h and memory.h too if +// they exists, since that shouldn't do any harm, but may improve portability. #ifdef HAVE_STRING_H # include <string.h> #endif |