odin-lang.Odin/core/sys/posix/string_libc.odin

#+build linux, windows, darwin, netbsd, openbsd, freebsd
package posix

when ODIN_OS == .Windows {
	foreign import lib "system:libucrt.lib"
} else when ODIN_OS == .Darwin {
	foreign import lib "system:System.framework"
} else {
	foreign import lib "system:c"
}

// string.h - string operations

// NOTE: most of the symbols in this header are not useful in Odin and have been left out.

foreign lib {
	/*
	Map the error number to a locale-dependent error message string.

	Returns: a string that may be invalidated by subsequent calls

	[[ More; https://pubs.opengroup.org/onlinepubs/9699919799/functions/strerror.html ]]
	*/
	@(link_name="strerror")
	_strerror :: proc(errnum: Errno) -> cstring ---
}

strerror :: #force_inline proc "contextless" (errnum: Maybe(Errno) = nil) -> cstring {
	return _strerror(errnum.? or_else errno())
}