passwd fields now have sentinels

src/libnss.zig

@@ -127,7 +127,7 @@ export fn _nss_turbo_getpwuid_r(
 }
 
 export fn _nss_turbo_getpwnam_r(
-    name: [*:0]u8,
+    name: [*:0]const u8,
     passwd: *CUser,
     buffer: [*]u8,
     buflen: usize,
@@ -164,17 +164,54 @@ fn get_db(errnop: *c_int) ?DB {
 
 const testing = std.testing;
 
-test "nss_turbo_getpwuid_r" {
-    var errc = ErrCtx{};
-    var tf = try File.TestDB.init(testing.allocator, &errc);
+test "getpwuid_r and getpwnam_r" {
+    var tf = try File.TestDB.init(testing.allocator);
     defer tf.deinit();
+    const turbonss_db_path_old = turbonss_db_path;
     turbonss_db_path = tf.path;
+    defer {
+        turbonss_db_path = turbonss_db_path_old;
+    }
 
-    var passwd: CUser = undefined;
     var buffer: [1024]u8 = undefined;
     var errno: c_int = 0;
 
-    const status = _nss_turbo_getpwuid_r(0, &passwd, &buffer, buffer.len, &errno);
+    var passwd: CUser = undefined;
+    try testing.expectEqual(
+        c.NSS_STATUS_SUCCESS,
+        _nss_turbo_getpwuid_r(128, &passwd, &buffer, buffer.len, &errno),
+    );
     try testing.expectEqual(@as(c_int, 0), errno);
-    try testing.expectEqual(c.NSS_STATUS_SUCCESS, status);
+    try testVidmantas(passwd);
+
+    passwd = undefined;
+    try testing.expectEqual(
+        c.NSS_STATUS_SUCCESS,
+        _nss_turbo_getpwnam_r("vidmantas", &passwd, &buffer, buffer.len, &errno),
+    );
+    try testing.expectEqual(@as(c_int, 0), errno);
+    try testVidmantas(passwd);
+
+    passwd = undefined;
+    try testing.expectEqual(
+        c.NSS_STATUS_NOTFOUND,
+        _nss_turbo_getpwnam_r("does not exist", &passwd, &buffer, buffer.len, &errno),
+    );
+    try testing.expectEqual(@enumToInt(os.E.NOENT), @intCast(u16, errno));
+
+    passwd = undefined;
+    var small_buffer: [1]u8 = undefined;
+    try testing.expectEqual(
+        c.NSS_STATUS_TRYAGAIN,
+        _nss_turbo_getpwuid_r(0, &passwd, &small_buffer, small_buffer.len, &errno),
+    );
+    try testing.expectEqual(@enumToInt(os.E.RANGE), @intCast(u16, errno));
+}
+
+fn testVidmantas(u: CUser) !void {
+    try testing.expectEqualStrings("vidmantas", mem.sliceTo(u.pw_name, 0));
+    try testing.expectEqual(@as(u32, 128), u.pw_uid);
+    try testing.expectEqual(@as(u32, 128), u.pw_gid);
+    try testing.expectEqualStrings("Vidmantas Kaminskas", mem.sliceTo(u.pw_gecos, 0));
+    try testing.expectEqualStrings("/bin/bash", mem.sliceTo(u.pw_shell, 0));
 }