Add POSIX swab.
Surprisingly to me, there are actual uses of `swab` in the codebases
I have available to search, including one with a #ifndef __ANDROID__
around it.
Bug: N/A
Test: ran tests
Change-Id: Ic91b78ae22bb65c346cb46dd38916f48d979abe0
diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index 9cfb918..a2beb38 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -246,6 +246,8 @@
int getdomainname(char* __buf, size_t __buf_size) __INTRODUCED_IN(26);
int setdomainname(const char* __name, size_t __n) __INTRODUCED_IN(26);
+void swab(const void* __src, void* __dst, ssize_t __byte_count) __INTRODUCED_IN_FUTURE;
+
#if defined(__BIONIC_INCLUDE_FORTIFY_HEADERS)
#include <bits/fortify/unistd.h>
#endif