We already include limits.h from a couple places (libfdt and the sbi test for riscv). We should provide our own limits.h rather than depend on the build environment as some cross environments may not support it (building riscv with a ilp32d toolchain fails, for example). We guard each definition to ensure we only provide them when the sizes match our expectations. If something is strange then the define won't be created, and either the includer won't notice since it wasn't used or the build will break and limits.h can be extended. Signed-off-by: Andrew Jones <andrew.jones@xxxxxxxxx> --- lib/limits.h | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 lib/limits.h diff --git a/lib/limits.h b/lib/limits.h new file mode 100644 index 000000000000..650085c68e5d --- /dev/null +++ b/lib/limits.h @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef _LIMITS_H_ +#define _LIMITS_H_ + +#if __CHAR_BIT__ == 8 +# if __CHAR_UNSIGNED__ +# define CHAR_MIN 0 +# define CHAR_MAX __UINT8_MAX__ +# else +# define CHAR_MAX __INT8_MAX__ +# define CHAR_MIN (-CHAR_MAX - 1) +# endif +#endif + +#if __SHRT_WIDTH__ == 16 +# define SHRT_MAX __INT16_MAX__ +# define SHRT_MIN (-SHRT_MAX - 1) +# define USHRT_MAX __UINT16_MAX__ +#endif + +#if __INT_WIDTH__ == 32 +# define INT_MAX __INT32_MAX__ +# define INT_MIN (-INT_MAX - 1) +# define UINT_MAX __UINT32_MAX__ +#endif + +#if __LONG_WIDTH__ == 64 +# define LONG_MAX __INT64_MAX__ +# define LONG_MIN (-LONG_MAX - 1) +# define ULONG_MAX __UINT64_MAX__ +#elif __LONG_WIDTH__ == 32 +# define LONG_MAX __INT32_MAX__ +# define LONG_MIN (-LONG_MAX - 1) +# define ULONG_MAX __UINT32_MAX__ +#endif + +#if __LONG_LONG_WIDTH__ == 64 +# define LLONG_MAX __INT64_MAX__ +# define LLONG_MIN (-LLONG_MAX - 1) +# define ULLONG_MAX __UINT64_MAX__ +#endif + +#endif /* _LIMITS_H_ */ -- 2.45.2
