locale-setup: merge locale handling in PID1 and localed

src/shared/locale-setup.h

@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "locale-util.h"
+#include "time-util.h"
+
+typedef struct LocaleContext {
+        usec_t mtime;
+        char *locale[_VARIABLE_LC_MAX];
+} LocaleContext;
+
+typedef enum LocaleLoadFlag {
+        LOCALE_LOAD_PROC_CMDLINE = 1 << 0,
+        LOCALE_LOAD_LOCALE_CONF  = 1 << 1,
+        LOCALE_LOAD_ENVIRONMENT  = 1 << 2,
+        LOCALE_LOAD_SIMPLIFY     = 1 << 3,
+} LocaleLoadFlag;
+
+void locale_context_clear(LocaleContext *c);
+int locale_context_load(LocaleContext *c, LocaleLoadFlag flag);
+int locale_context_build_env(const LocaleContext *c, char ***ret_set, char ***ret_unset);
+int locale_context_save(LocaleContext *c, char ***ret_set, char ***ret_unset);
+
+int locale_context_merge(const LocaleContext *c, char *l[_VARIABLE_LC_MAX]);
+void locale_context_take(LocaleContext *c, char *l[_VARIABLE_LC_MAX]);
+bool locale_context_equal(const LocaleContext *c, char *l[_VARIABLE_LC_MAX]);
+
+int locale_setup(char ***environment);