[libcxx] Add Android support.

[compnerd]

This looks good to me, but you should probably wait for Marshall to take a look. It would be nice if you took care of the nits (fwiw, I hate trailing comments on the ifdefs since they are easy to get out of sync).

include/__locale

350

Might be nice to clang-format this line.

include/locale

198

This is no longer very precise (not that it was particularly so before your change).

3678

Update the trailing comment.

3693

Same.

src/locale.cpp

35

Same.

[mclow.lists]

Committed (with minor formatting changes) as revision 212724

include/__config

 #if defined(__FreeBSD__)
 #define _LIBCPP_HAS_QUICK_EXIT
 #define _LIBCPP_HAS_C11_FEATURES
+#elif defined(__ANDROID__)
+#define _LIBCPP_HAS_QUICK_EXIT
 #elif defined(__linux__)
 #include <features.h>
 #if __GLIBC_PREREQ(2, 15)

include/__locale

 # include <support/win32/locale_win32.h>
 #elif defined(_AIX)
 # include <support/ibm/xlocale.h>
+#elif defined(__ANDROID__)
+// Android gained the locale aware functions in L (API level 21)
+# include <android/api-level.h>
+# if __ANDROID_API__ <= 20
+#  include <support/android/locale_bionic.h>
+# endif
 #elif (defined(__GLIBC__) || defined(__APPLE__) || defined(__FreeBSD__) || defined(__sun__)) || defined(__EMSCRIPTEN__) || defined(__IBMCPP__)
 # include <xlocale.h>
 #endif  // _WIN32 || __GLIBC__ || __APPLE__ || __FreeBSD__ || __sun__ || __EMSCRIPTEN__ || __IBMCPP__

     static const mask punct  = _PUNCT;
     static const mask xdigit = _HEX;
     static const mask blank  = _BLANK;
-#elif defined(__APPLE__) || defined(__FreeBSD__) || defined(__EMSCRIPTEN__) || defined(__NetBSD__)
+#elif defined(__APPLE__) || defined(__FreeBSD__) || defined(__EMSCRIPTEN__) || defined(__NetBSD__) || defined(__ANDROID__)
 #ifdef __APPLE__
     typedef __uint32_t mask;
 #elif defined(__FreeBSD__)
     typedef unsigned long mask;
 #elif defined(__EMSCRIPTEN__) ||  defined(__NetBSD__)
     typedef unsigned short mask;
+#elif defined(__ANDROID__)
+    typedef char mask;
 #endif
     static const mask space  = _CTYPE_S;
     static const mask print  = _CTYPE_R;

include/locale

 #include <ctime>
 #if defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
 #include <support/win32/locale_win32.h>
-#else // _LIBCPP_MSVCRT
+#elif !defined(__ANDROID__)
 #include <nl_types.h>
 #endif  // !_LIBCPP_MSVCRT
 

 typename messages<_CharT>::catalog
 messages<_CharT>::do_open(const basic_string<char>& __nm, const locale&) const
 {
-#ifdef _WIN32
+#if defined(_WIN32) || defined(__ANDROID__)
     return -1;
 #else // _WIN32
     catalog __cat = (catalog)catopen(__nm.c_str(), NL_CAT_LOCALE);

 messages<_CharT>::do_get(catalog __c, int __set, int __msgid,
                          const string_type& __dflt) const
 {
-#ifdef _WIN32
+#if defined(_WIN32) || defined(__ANDROID__)
     return __dflt;
 #else // _WIN32
     string __ndflt;

 void
 messages<_CharT>::do_close(catalog __c) const
 {
-#if !defined(_WIN32)
+#if !defined(_WIN32) && !defined(__ANDROID__)
     if (__c != -1)
         __c <<= 1;
     nl_catd __cat = (nl_catd)__c;

include/support/android/locale_bionic.h

+// -*- C++ -*-
+//===------------------- support/android/locale_bionic.h ------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_SUPPORT_ANDROID_LOCALE_BIONIC_H
+#define _LIBCPP_SUPPORT_ANDROID_LOCALE_BIONIC_H
+
+#if defined(__ANDROID__)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+#include <xlocale.h>
+
+static inline int isalnum_l(int c, locale_t) {
+  return isalnum(c);
+}
+
+static inline int isalpha_l(int c, locale_t) {
+  return isalpha(c);
+}
+
+static inline int isblank_l(int c, locale_t) {
+  return isblank(c);
+}
+
+static inline int iscntrl_l(int c, locale_t) {
+  return iscntrl(c);
+}
+
+static inline int isdigit_l(int c, locale_t) {
+  return isdigit(c);
+}
+
+static inline int isgraph_l(int c, locale_t) {
+  return isgraph(c);
+}
+
+static inline int islower_l(int c, locale_t) {
+  return islower(c);
+}
+
+static inline int isprint_l(int c, locale_t) {
+  return isprint(c);
+}
+
+static inline int ispunct_l(int c, locale_t) {
+  return ispunct(c);
+}
+
+static inline int isspace_l(int c, locale_t) {
+  return isspace(c);
+}
+
+static inline int isupper_l(int c, locale_t) {
+  return isupper(c);
+}
+
+static inline int isxdigit_l(int c, locale_t) {
+  return isxdigit(c);
+}
+
+static inline int iswalnum_l(wint_t c, locale_t) {
+  return iswalnum(c);
+}
+
+static inline int iswalpha_l(wint_t c, locale_t) {
+  return iswalpha(c);
+}
+
+static inline int iswblank_l(wint_t c, locale_t) {
+  return iswblank(c);
+}
+
+static inline int iswcntrl_l(wint_t c, locale_t) {
+  return iswcntrl(c);
+}
+
+static inline int iswdigit_l(wint_t c, locale_t) {
+  return iswdigit(c);
+}
+
+static inline int iswgraph_l(wint_t c, locale_t) {
+  return iswgraph(c);
+}
+
+static inline int iswlower_l(wint_t c, locale_t) {
+  return iswlower(c);
+}
+
+static inline int iswprint_l(wint_t c, locale_t) {
+  return iswprint(c);
+}
+
+static inline int iswpunct_l(wint_t c, locale_t) {
+  return iswpunct(c);
+}
+
+static inline int iswspace_l(wint_t c, locale_t) {
+  return iswspace(c);
+}
+
+static inline int iswupper_l(wint_t c, locale_t) {
+  return iswupper(c);
+}
+
+static inline int iswxdigit_l(wint_t c, locale_t) {
+  return iswxdigit(c);
+}
+
+static inline int toupper_l(int c, locale_t) {
+  return toupper(c);
+}
+
+static inline int tolower_l(int c, locale_t) {
+  return tolower(c);
+}
+
+static inline int towupper_l(int c, locale_t) {
+  return towupper(c);
+}
+
+static inline int towlower_l(int c, locale_t) {
+  return towlower(c);
+}
+
+static inline int strcoll_l(const char *s1, const char *s2, locale_t) {
+  return strcoll(s1, s2);
+}
+
+static inline size_t strxfrm_l(char *dest, const char *src, size_t n,
+                               locale_t) {
+  return strxfrm(dest, src, n);
+}
+
+static inline size_t strftime_l(char *s, size_t max, const char *format,
+                                const struct tm *tm, locale_t) {
+  return strftime(s, max, format, tm);
+}
+
+static inline int wcscoll_l(const wchar_t *ws1, const wchar_t *ws2, locale_t) {
+  return wcscoll(ws1, ws2);
+}
+
+static inline size_t wcsxfrm_l(wchar_t *dest, const wchar_t *src, size_t n,
+                               locale_t) {
+  return wcsxfrm(dest, src, n);
+}
+
+static inline long double strtold_l(const char *nptr, char **endptr, locale_t) {
+  return strtold(nptr, endptr);
+}
+
+static inline long long strtoll_l(const char *nptr, char **endptr, size_t base,
+                                  locale_t) {
+  return strtoll(nptr, endptr, base);
+}
+
+static inline unsigned long long strtoull_l(const char *nptr, char **endptr,
+                                            size_t base, locale_t) {
+  return strtoull(nptr, endptr, base);
+}
+
+static inline long long wcstoll_l(const wchar_t *nptr, wchar_t **endptr,
+                                  size_t base, locale_t) {
+  return wcstoll(nptr, endptr, base);
+}
+
+static inline unsigned long long wcstoull_l(const wchar_t *nptr,
+                                            wchar_t **endptr, size_t base,
+                                            locale_t) {
+  return wcstoull(nptr, endptr, base);
+}
+
+static inline long double wcstold_l(const wchar_t *nptr, wchar_t **endptr,
+                                    locale_t) {
+  return wcstold(nptr, endptr);
+}
+
+#ifdef __cplusplus
+}
+#endif
+#endif // defined(__ANDROID__)
+#endif // _LIBCPP_SUPPORT_ANDROID_LOCALE_BIONIC_H

src/locale.cpp

 #include "__sso_allocator"
 #if defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
 #include <support/win32/locale_win32.h>
-#else // _LIBCPP_MSVCRT
+#elif !defined(__ANDROID__)
 #include <langinfo.h>
 #endif // !_LIBCPP_MSVCRT
 #include <stdlib.h>

     return *__ctype_b_loc();
 #elif defined(_AIX)
     return (const unsigned int *)__lc_ctype_ptr->obj->mask;
+#elif defined(__ANDROID__)
+    return _ctype_;
 #else
     // Platform not supported: abort so the person doing the port knows what to
     // fix