LibC: Allow detection of supported locales through setlocale

Closes #14690
Author: https://github.com/implicitfield Commit: https://github.com/SerenityOS/serenity/commit/767b23c4aa Pull-request: https://github.com/SerenityOS/serenity/pull/15385 Issue: https://github.com/SerenityOS/serenity/issues/14690 Reviewed-by: https://github.com/ADKaster ✅
2025-04-24 21:45:20 +00:00 · 2022-09-28 22:01:54 +03:00 · 2022-09-28 22:01:54 +03:00 · 767b23c4aa · 2024-07-18 00:41:35 +09:00
commit 767b23c4aa
parent 3353f89e22
1 changed files with 12 additions and 4 deletions
--- a/Userland/Libraries/LibC/locale.cpp
+++ b/Userland/Libraries/LibC/locale.cpp
@ -45,11 +45,19 @@ static struct lconv default_locale = {
    default_empty_value
 };

-char* setlocale(int, char const*)
+char* setlocale(int, char const* locale)
 {
-    static char locale[2];
-    memcpy(locale, "C", 2);
-    return locale;
+    static char c_locale_string[2];
+    memcpy(c_locale_string, "C", 2);
+
+    // If we get a null pointer, return the current locale as per POSIX spec.
+    if (locale == nullptr)
+        return c_locale_string;
+
+    if (strcmp(locale, "POSIX") == 0 || strcmp(locale, "C") == 0 || strcmp(locale, "") == 0)
+        return c_locale_string;
+
+    return nullptr;
 }

 struct lconv* localeconv()