From 618b612754ade1b87164f001e392fc4f83697181 Mon Sep 17 00:00:00 2001
From: Eugene <caima12138@foxmail.com>
Date: Sun, 14 Aug 2022 21:27:21 +0800
Subject: [PATCH] =?UTF-8?q?=E5=B0=86=20kernel\common\math\pow.c=20?=
 =?UTF-8?q?=E7=9A=84=E6=B1=82=E5=B9=82=E8=BF=90=E7=AE=97=E4=BC=98=E5=8C=96?=
 =?UTF-8?q?=E4=B8=BA=E5=BF=AB=E9=80=9F=E5=B9=82?=
MIME-Version: 1.0
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---
 .gitignore                        |  3 ++-
 .vscode/settings.json             |  3 ++-
 kernel/common/math/pow.c          | 15 +++++++++++++--
 kernel/filesystem/fat32/fat_ent.c |  2 +-
 4 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/.gitignore b/.gitignore
index 2fff4a67..13b1f785 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,4 +9,5 @@ kernel/kernel
 serial_opt.txt
 user/sys_api_lib
 
-docs/_build
\ No newline at end of file
+docs/_build
+draft
\ No newline at end of file
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 413ca78d..f2f2e7e1 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -120,7 +120,8 @@
         "screen_manager.h": "c",
         "textui.h": "c",
         "atomic.h": "c",
-        "uart.h": "c"
+        "uart.h": "c",
+        "fat_ent.h": "c"
     },
     "C_Cpp.errorSquiggles": "Enabled",
     "esbonio.sphinx.confDir": ""
diff --git a/kernel/common/math/pow.c b/kernel/common/math/pow.c
index 9d2ee308..9d61672c 100644
--- a/kernel/common/math/pow.c
+++ b/kernel/common/math/pow.c
@@ -3,8 +3,19 @@
 
 int64_t pow(int64_t x, int y)
 {
+    if (y == 0)
+        return 1;
+    if (y == 1)
+        return x;
+    if (y == 2)
+        return x * x;
     int64_t res = 1;
-    for (int i = 0; i < y; ++i)
-        res *= x;
+    while (y != 0)
+    {
+        if (y & 1)
+            res *= x;
+        y >>= 1;
+        x *= x;
+    }
     return res;
 }
\ No newline at end of file
diff --git a/kernel/filesystem/fat32/fat_ent.c b/kernel/filesystem/fat32/fat_ent.c
index c88ed8cd..559b6241 100644
--- a/kernel/filesystem/fat32/fat_ent.c
+++ b/kernel/filesystem/fat32/fat_ent.c
@@ -345,7 +345,7 @@ void fat32_fill_shortname(struct vfs_dir_entry_t *dEntry, struct fat32_Directory
         }
         else
         {
-            for(int j = 8;j<11;++j)
+            for (int j = 8; j < 11; ++j)
             {
                 target->DIR_Name[j] = 'a';
             }