Implement <langinfo.h>.
POSIX locale only, as usual.
The GNU YESSTR and NOSTR extensions return the empty string in the C locale,
so I haven't bothered supporting them.
Bug: http://b/1401872
Test: bionic tests
Change-Id: I6846839e4f9f1812344ed5dce0b93f83c0c20eb3
diff --git a/libc/include/langinfo.h b/libc/include/langinfo.h
new file mode 100644
index 0000000..5c884ac
--- /dev/null
+++ b/libc/include/langinfo.h
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _LANGINFO_H_
+#define _LANGINFO_H_
+
+#include <sys/cdefs.h>
+
+#include <nl_types.h>
+#include <xlocale.h>
+
+__BEGIN_DECLS
+
+#define CODESET 1
+#define D_T_FMT 2
+#define D_FMT 3
+#define T_FMT 4
+#define T_FMT_AMPM 5
+#define AM_STR 6
+#define PM_STR 7
+#define DAY_1 8
+#define DAY_2 9
+#define DAY_3 10
+#define DAY_4 11
+#define DAY_5 12
+#define DAY_6 13
+#define DAY_7 14
+#define ABDAY_1 15
+#define ABDAY_2 16
+#define ABDAY_3 17
+#define ABDAY_4 18
+#define ABDAY_5 19
+#define ABDAY_6 20
+#define ABDAY_7 21
+#define MON_1 22
+#define MON_2 23
+#define MON_3 24
+#define MON_4 25
+#define MON_5 26
+#define MON_6 27
+#define MON_7 28
+#define MON_8 29
+#define MON_9 30
+#define MON_10 31
+#define MON_11 32
+#define MON_12 33
+#define ABMON_1 34
+#define ABMON_2 35
+#define ABMON_3 36
+#define ABMON_4 37
+#define ABMON_5 38
+#define ABMON_6 39
+#define ABMON_7 40
+#define ABMON_8 41
+#define ABMON_9 42
+#define ABMON_10 43
+#define ABMON_11 44
+#define ABMON_12 45
+#define ERA 46
+#define ERA_D_FMT 47
+#define ERA_D_T_FMT 48
+#define ERA_T_FMT 49
+#define ALT_DIGITS 50
+#define RADIXCHAR 51
+#define THOUSEP 52
+#define YESEXPR 53
+#define NOEXPR 54
+#define CRNCYSTR 55
+
+char* nl_langinfo(nl_item) __INTRODUCED_IN_FUTURE;
+char* nl_langinfo_l(nl_item, locale_t) __INTRODUCED_IN_FUTURE;
+
+__END_DECLS
+
+#endif