From 5c68d50070c2dfffad4bef377a053097fe63cec7 Mon Sep 17 00:00:00 2001
From: apio <blobs.trading@gmail.com>
Date: Wed, 31 May 2023 22:12:50 +0200
Subject: [PATCH] libc: Add a very bare-bones locale.h

---
 libc/CMakeLists.txt            |  1 +
 libc/include/bits/locale-cat.h | 18 ++++++++++++++++++
 libc/include/locale.h          | 20 ++++++++++++++++++++
 libc/src/locale.cpp            | 12 ++++++++++++
 4 files changed, 51 insertions(+)
 create mode 100644 libc/include/bits/locale-cat.h
 create mode 100644 libc/include/locale.h
 create mode 100644 libc/src/locale.cpp

diff --git a/libc/CMakeLists.txt b/libc/CMakeLists.txt
index 75033f6a..46834ba4 100644
--- a/libc/CMakeLists.txt
+++ b/libc/CMakeLists.txt
@@ -19,6 +19,7 @@ set(SOURCES
     src/env.cpp
     src/pwd.cpp
     src/grp.cpp
+    src/locale.cpp
     src/sys/stat.cpp
     src/sys/mman.cpp
     src/sys/wait.cpp
diff --git a/libc/include/bits/locale-cat.h b/libc/include/bits/locale-cat.h
new file mode 100644
index 00000000..ceef5821
--- /dev/null
+++ b/libc/include/bits/locale-cat.h
@@ -0,0 +1,18 @@
+/* bits/locale-cat.h: Locale categories. */
+
+#ifndef _BITS_LOCALE_CAT_H
+#define _BITS_LOCALE_CAT_H
+
+enum __libc_locale_category
+{
+    LC_ALL,      // Controls all locales.
+    LC_CTYPE,    // Character classification and case conversion.
+    LC_COLLATE,  // Collation order.
+    LC_MONETARY, // Monetary formatting.
+    LC_NUMERIC,  // Numeric, non-monetary formatting.
+    LC_TIME,     // Date and time formats.
+    LC_MESSAGES, // Formats of informative and diagnostic messages and interactive responses.
+    __num_locale_categories,
+};
+
+#endif
diff --git a/libc/include/locale.h b/libc/include/locale.h
new file mode 100644
index 00000000..e0740303
--- /dev/null
+++ b/libc/include/locale.h
@@ -0,0 +1,20 @@
+/* locale.h: Locale category macros. */
+
+#ifndef _LOCALE_H
+#define _LOCALE_H
+
+#include <bits/locale-cat.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    // Query or set the current locale.
+    char* setlocale(int category, const char* locale);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/libc/src/locale.cpp b/libc/src/locale.cpp
new file mode 100644
index 00000000..19c508ab
--- /dev/null
+++ b/libc/src/locale.cpp
@@ -0,0 +1,12 @@
+#include <locale.h>
+
+static char s_default_locale[] = "C";
+
+extern "C"
+{
+    char* setlocale(int, const char*)
+    {
+        // FIXME: Set the current locale if <locale> is not NULL.
+        return s_default_locale;
+    }
+}