reserach st: refine key.c

@@ -56,51 +56,52 @@ static int key_max = 0;
  */
 int st_key_create(int *keyp, _st_destructor_t destructor)
 {
-  if (key_max >= ST_KEYS_MAX) {
-    errno = EAGAIN;
-    return -1;
-  }
-
-  *keyp = key_max++;
-  _st_destructors[*keyp] = destructor;
-
-  return 0;
+    if (key_max >= ST_KEYS_MAX) {
+        errno = EAGAIN;
+        return -1;
+    }
+    
+    *keyp = key_max++;
+    _st_destructors[*keyp] = destructor;
+    
+    return 0;
 }
 
 
 int st_key_getlimit(void)
 {
-  return ST_KEYS_MAX;
+    return ST_KEYS_MAX;
 }
 
 
 int st_thread_setspecific(int key, void *value)
 {
-  _st_thread_t *me = _ST_CURRENT_THREAD();
-
-  if (key < 0 || key >= key_max) {
-    errno = EINVAL;
-    return -1;
-  }
-
-  if (value != me->private_data[key]) {
-    /* free up previously set non-NULL data value */
-    if (me->private_data[key] && _st_destructors[key]) {
-      (*_st_destructors[key])(me->private_data[key]);
+    _st_thread_t *me = _ST_CURRENT_THREAD();
+    
+    if (key < 0 || key >= key_max) {
+        errno = EINVAL;
+        return -1;
     }
-    me->private_data[key] = value;
-  }
-
-  return 0;
+    
+    if (value != me->private_data[key]) {
+        /* free up previously set non-NULL data value */
+        if (me->private_data[key] && _st_destructors[key]) {
+            (*_st_destructors[key])(me->private_data[key]);
+        }
+        me->private_data[key] = value;
+    }
+    
+    return 0;
 }
 
 
 void *st_thread_getspecific(int key)
 {
-  if (key < 0 || key >= key_max)
-    return NULL;
-
-  return ((_ST_CURRENT_THREAD())->private_data[key]);
+    if (key < 0 || key >= key_max) {
+        return NULL;
+    }
+    
+    return ((_ST_CURRENT_THREAD())->private_data[key]);
 }
 
 
@@ -109,13 +110,13 @@ void *st_thread_getspecific(int key)
  */
 void _st_thread_cleanup(_st_thread_t *thread)
 {
-  int key;
-
-  for (key = 0; key < key_max; key++) {
-    if (thread->private_data[key] && _st_destructors[key]) {
-      (*_st_destructors[key])(thread->private_data[key]);
-      thread->private_data[key] = NULL;
+    int key;
+    
+    for (key = 0; key < key_max; key++) {
+        if (thread->private_data[key] && _st_destructors[key]) {
+            (*_st_destructors[key])(thread->private_data[key]);
+            thread->private_data[key] = NULL;
+        }
     }
-  }
 }