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[libc] Add setlocale()

--- /dev/null

+++ b/libc/include/locale.h

@@ -1,0 +1,14 @@

+

+#ifndef _LOCALE_H

+#define _LOCALE_H

+

+#define LC_ALL      0

+#define LC_COLLATE  1

+#define LC_CTYPE    2

+#define LC_MONETARY 3

+#define LC_NUMERIC  4

+#define LC_TIME     5

+

+extern char *setlocale(int category, const char *locale);

+

+#endif

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -3,7 +3,8 @@

 LIBCOBJ = assert.o strcpy.o strcmp.o strlen.o strchr.o \

           strrchr.o strcat.o strncpy.o strncat.o strcoll.o \

-          memset.o memcpy.o memmove.o memcmp.o memchr.o

+          memset.o memcpy.o memmove.o memcmp.o memchr.o \

+          setlocale.o

 all: libc.a

--- /dev/null

+++ b/libc/src/setlocale.c

@@ -1,0 +1,16 @@

+/* See LICENSE file for copyright and license details. */

+

+#include <locale.h>

+

+char *

+setlocale(int category, const char *locale)

+{

+	if (category > LC_TIME || category < LC_ALL)

+		return NULL;

+	if (!locale ||

+	    locale[0] == '\0' ||

+	    locale[0] == 'C' && locale[1] == '\0') {

+		return "C";

+	}

+	return NULL;

+}