add unix file class

2 files changed, 110 insertions, 0 deletions

diff --git a/include/error.h b/include/error.h
index d058ec4..50ca23e 100644
--- a/include/error.h
+++ b/include/error.h
@@ -20,6 +20,12 @@ enum class error_code
     // eval
     EVAL_FAIL_TO_CREATE_PIPE,
 
+    // file
+    FILE_MODE_NOT_SET,
+    FILE_FAIL_TO_OPEN,
+    FILE_OFLAG_ERROR,
+    FILE_POINTER_FAIL_TO_OPEN,
+
 };
 
 class T_error : public std::runtime_error {
diff --git a/include/util/file.h b/include/util/file.h
new file mode 100644
index 0000000..bbc6539
--- /dev/null
+++ b/include/util/file.h
@@ -0,0 +1,104 @@
+#pragma once
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <string>
+#include <cstdio>
+
+#include "error.h"
+
+namespace ov4
+{
+
+class T_unix_file_d;
+class T_unix_file_p;
+
+
+class T_unix_file_d
+{
+public:
+    int fd = -1;
+
+    virtual int close()
+    {
+        if (fd == -1) return -1;
+        int ret = ::close(fd);
+        fd = -1;
+        return ret;
+    }
+
+    T_unix_file_d(const std::string &path, int oflag, int mode = -1)
+    {
+        if (oflag & O_CREAT)
+        {
+            if (mode == -1) throw T_error{error_code::FILE_MODE_NOT_SET, "Mode should be set for O_CREAT"};
+            fd = open(path.c_str(), oflag, mode);
+            if (fd == -1)
+                throw T_error(error_code::FILE_FAIL_TO_OPEN, "Fail to open file");
+            return;
+        }
+        fd = open(path.c_str(), oflag);
+        if (fd == -1)
+            throw T_error(error_code::FILE_FAIL_TO_OPEN, "Fail to open file");
+    }
+
+    ~T_unix_file_d()
+    {
+        this->close();
+    }
+
+    T_unix_file_d(const T_unix_file_d &) = delete;
+    T_unix_file_d &operator=(const T_unix_file_d &) = delete;
+};
+
+class T_unix_file_p : public T_unix_file_d
+{
+public:
+    FILE* fp = nullptr;
+
+    int close() override
+    {
+        if (fp == nullptr) return -1;
+        int ret = fclose(fp);
+        fp = nullptr;
+        fd = -1;
+        return ret;
+    }
+
+    T_unix_file_p(const std::string &path, int oflag, int mode = -1) 
+        : T_unix_file_d(path, oflag, mode)
+    {
+        const char *fp_mode;
+        switch (oflag & O_ACCMODE)
+        {
+            case O_RDONLY:
+                fp_mode = "r";
+                break;
+            
+            case O_WRONLY:
+                fp_mode = "w";
+                break;
+
+            case O_RDWR:
+                fp_mode = "r+";
+                break;
+
+            default:
+                throw T_error{error_code::FILE_OFLAG_ERROR, "oflag error"};
+        }
+        fp = fdopen(fd, fp_mode);
+
+        if (fp == nullptr)
+            throw T_error{error_code::FILE_POINTER_FAIL_TO_OPEN, "Fail to open file pointer"};
+    }
+
+    ~T_unix_file_p()
+    {
+        this->close();
+    }
+
+    T_unix_file_p(const T_unix_file_p &) = delete;
+    T_unix_file_p &operator=(const T_unix_file_p &) = delete;
+};
+
+}
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