libc: report complete locale information

apps/browser-demos/test/locale-info.spec.ts

@@ -0,0 +1,58 @@
+import { expect, test } from "@playwright/test";
+import { dirname, resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const programPath = resolve(
+  __dirname,
+  "../../../examples/locale_info_test.wasm",
+);
+
+test("locale object names and alternate months work in Chromium", async ({
+  page,
+  baseURL,
+  browserName,
+}) => {
+  test.skip(
+    browserName !== "chromium",
+    "the aggregate browser gate uses Chromium",
+  );
+  expect(baseURL).toBeTruthy();
+
+  const runtimeErrors: string[] = [];
+  page.on("console", (message) => {
+    if (message.type() === "error") {
+      runtimeErrors.push(`console: ${message.text()}`);
+    }
+  });
+  page.on("pageerror", (error) => {
+    runtimeErrors.push(`pageerror: ${error.message}`);
+  });
+  await page.route("**/favicon.ico", (route) =>
+    route.fulfill({ status: 204 }),
+  );
+
+  await page.goto(new URL("/pages/test-runner/", baseURL).href);
+  await page.waitForFunction(() => (window as any).__testRunnerReady === true);
+
+  const programUrl = new URL(`/@fs/${programPath}`, baseURL).href;
+  const result = await page.evaluate(
+    async ({ programUrl }) => {
+      const response = await fetch(programUrl);
+      if (!response.ok) {
+        throw new Error(`program fetch failed: ${response.status}`);
+      }
+      return (window as any).__runTest(
+        await response.arrayBuffer(),
+        ["locale-info-test"],
+        60_000,
+      );
+    },
+    { programUrl },
+  );
+
+  expect(result.exitCode, result.stderr).toBe(0);
+  expect(result.stdout).toBe("locale-info-ok\n");
+  expect(result.stderr).toBe("");
+  expect(runtimeErrors).toEqual([]);
+});

docs/posix-status.md

@@ -357,6 +357,13 @@ All virtual devices return synthetic `stat()` with `S_IFCHR | 0666`, determinist
 | `setenv()` / `unsetenv()` | Full | Kernel-managed. setenv supports overwrite flag. Rejects empty name or name containing '='. |
 | `environ` | Partial | Stored as Vec of KEY=VALUE entries in Process. No C-style char** environ pointer yet. |
 
+## Locale
+
+| Function | Status | Notes |
+|----------|--------|-------|
+| `getlocalename_l()` | Full | Returns the real per-category name from local and global locale objects. LC_ALL returns a `setlocale()`-compatible name, including mixed-category locales. |
+| `nl_langinfo()` / `nl_langinfo_l()` | Partial | Implements musl's locale data plus POSIX.1-2024 `ALTMON_1` through `ALTMON_12` and `ABALTMON_1` through `ABALTMON_12`. Musl catalogs do not encode a distinct alternate grammatical month form, so those items fall back to the corresponding full or abbreviated month name. |
+
 ## System Information
 
 | Function | Status | Notes |