all: Use bool where applicable (#30)

exosphere/userpage.c

@@ -7,10 +7,10 @@ uint64_t g_secure_page_user_address = NULL;
 
 /* Create a user page reference for the desired address. */
 /* Returns 1 on success, 0 on failure. */
-int upage_init(upage_ref_t *upage, void *user_address) {
+bool upage_init(upage_ref_t *upage, void *user_address) {
     upage->user_page = get_page_for_address(user_address);
     upage->secure_page = 0ULL;
-    
+
     if (g_secure_page_user_address != NULL) {
         /* Different physical address indicate SPL was rebooted, or another process got access to svcCallSecureMonitor. Panic. */
         if (g_secure_page_user_address != upage->user_page) {
@@ -25,38 +25,38 @@ int upage_init(upage_ref_t *upage, void *user_address) {
             upage->secure_page = SECURE_USER_PAGE_ADDR;
         }
     }
-    
+
     return upage->secure_page != 0ULL;
 }
 
-int user_copy_to_secure(upage_ref_t *upage, void *secure_dst, void *user_src, size_t size) {    
+bool user_copy_to_secure(upage_ref_t *upage, void *secure_dst, void *user_src, size_t size) {
     /* Fail if the page doesn't match. */
     if (get_page_for_address(user_src) != upage->user_page) {
-        return 0;
+        return false;
     }
-    
+
     /* Fail if we go past the page boundary. */
     if (size != 0 && get_page_for_address(user_src + size - 1) != upage->user_page) {
-        return 0;
+        return false;
     }
-    
+
     void *secure_src = (void *)(upage->secure_page + ((uint64_t)user_src - upage->user_page));
     memcpy(secure_dst, secure_src, size);
-    return 1;
+    return true;
 }
 
-int secure_copy_to_user(upage_ref_t *upage, void *user_dst, void *secure_src, size_t size) {    
+bool secure_copy_to_user(upage_ref_t *upage, void *user_dst, void *secure_src, size_t size) {
     /* Fail if the page doesn't match. */
     if (get_page_for_address(user_dst) != upage->user_page) {
-        return 0;
+        return false;
     }
-    
+
     /* Fail if we go past the page boundary. */
     if (size != 0 && get_page_for_address(user_dst + size - 1) != upage->user_page) {
-        return 0;
+        return false;
     }
 
     void *secure_dst = (void *)(upage->secure_page + ((uint64_t)user_dst - upage->user_page));
     memcpy(secure_dst, secure_src, size);
-    return 1;
+    return true;
 }