🦄 refactor(C13, C14, C115): 更新了linux系统开发部分的结构

C14-文件系统/readdir.c

@@ -0,0 +1,38 @@
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+#define PAT "/etc"
+
+/**
+ * @brief    解析PAT下文件个数
+ * @details
+ *
+ * @param    argc
+ * @param    argv
+ *
+ * @return  int
+ */
+int main(int argc, char **argv)
+{
+    DIR           *dp;
+    struct dirent *cur;
+
+    dp = opendir(PAT);
+    if (NULL == dp)
+    {
+        perror("opendir()");
+        exit(1);
+    }
+
+    // !!! 注意括号
+    while ((cur = readdir(dp)) != NULL)
+    {
+        puts(cur->d_name);
+    }
+
+    closedir(dp);
+
+    exit(0);
+}