From 6f312a66c0f436febda356b15abe2ce42d44f53e Mon Sep 17 00:00:00 2001
From: Mikachu2333 <mikachu.23333@zohomail.com>
Date: Tue, 7 Oct 2025 18:41:15 +0800
Subject: [PATCH] =?UTF-8?q?fix(lib):=20=E4=BC=98=E5=8C=96=E5=AD=97?=
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重构 `xy_str_delete_prefix` 函数以避免不必要的内存分配和释放，
直接使用原字符串进行处理。同时修复 `xy_dir_exist` 函数中 system
调用后未释放临时命令字符串的内存泄漏问题。
---
 lib/xy.h | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/lib/xy.h b/lib/xy.h
index f7d1325..77cd60f 100644
--- a/lib/xy.h
+++ b/lib/xy.h
@@ -581,13 +581,16 @@ xy_str_start_with (const char *str, const char *prefix)
 static char *
 xy_str_delete_prefix (const char *str, const char *prefix)
 {
-  char *new = xy_strdup (str);
   bool yes = xy_str_start_with (str, prefix);
-  if (!yes) return new;
-  size_t len = strlen (prefix);
-  char *ret = xy_strdup (new + len);
-  free (new);
-  return ret;
+  if (!yes)
+    {
+      return xy_strdup(str);
+    }
+  else
+    {
+      size_t len = strlen (prefix);
+      return xy_strdup (str + len);
+    }
 }
 
 /**
@@ -1224,7 +1227,9 @@ xy_dir_exist (const char *path)
     }
   else
     {
-      int status = system (xy_2strcat ("test -d ", dir));
+      char *tmp_cmd = xy_2strcat ("test -d ", dir);
+      int status = system (tmp_cmd);
+      free (tmp_cmd);
       bool result = (0==status);
       if (allocated_dir) free (allocated_dir);
       return result;