libdpf/thirdparty/portable-snippets/exact-int/README.md

Exact-Width Integer Types

Lots of stuff in psnip (as well as outside of psnip) requires exact-width integer types. C99 provides them in <stdint.h>, but sometimes you can't rely on C99 being available.

This header will define macros for psnip_(u)int(8,16,32,64)_t, using methods a bit more portable than just blindly including <stdint.h>:

• If __(U)INTN_TYPE__ is defined, use those types.
• On platforms where we know <stdint.h> is available (such as if we're compiling in C99 mode), we include <stdint.h>.
• Otherwise, if we're using Visual Studio, use types we know exist.
• If not, use <limits.h> to try to find some correctly-size types.

Headers in portable-snippets which use these types will only try to include exact-int.h if they are missing a type they actually use, which means you're free to create your own definitions for these types. This should help ensure that, if you already have exact-size types, portable-snippets will be compatible with them.

If are looking for a more complete portable implementation of <stdint.h> (for example, if you need the UINT*_C macros), there are several projects which aim to provide a more complete implementation, including:

• pstdint.h (BSD-3)
• msinttypes (BSD-3)

Feel free to file a PR if I'm missing anything.