diff --git a/cfileop.cpp b/cfileop.cpp
index a1d9741..67eeead 100644
--- a/cfileop.cpp
+++ b/cfileop.cpp
@@ -70,6 +70,13 @@ int fileop_isdir(const char* path, int* result) {
     return r ? 1 : 0;
 }
 
+#if _WIN32
+int fileop_isdrive(const char* path) {
+    if (!path) return 0;
+    return fileop::isdrive(path) ? 1 : 0;
+}
+#endif
+
 int fileop_mkdir(const char* path, int mode) {
     if (!path) return 0;
     return fileop::mkdir(path, mode) ? 1 : 0;
diff --git a/cfileop.h b/cfileop.h
index b000d81..3435614 100644
--- a/cfileop.h
+++ b/cfileop.h
@@ -9,6 +9,9 @@ extern "C" {
 #include <stdio.h>
 #include <sys/types.h>
 #include <fcntl.h>
+#if _WIN32
+#include <io.h>
+#endif
 /**
  * @brief Check file exists
  * @param fn File name
@@ -78,6 +81,14 @@ char* fileop_join(const char* path, const char* path2);
  * @return 0 if error occured otherwise 1
 */
 int fileop_isdir(const char* path, int* result);
+#if _WIN32
+/**
+ * @brief Check if a path only contains drive.
+ * @param path Path
+ * @return 1 if true otherwise 0
+*/
+int fileop_isdrive(const char* path);
+#endif
 /**
  * @brief Creates a new directory.
  * @param path Path for a new directory.
diff --git a/err.cpp b/err.cpp
index a23f3a8..3ec05d4 100644
--- a/err.cpp
+++ b/err.cpp
@@ -8,6 +8,7 @@
 #if _WIN32
 #include "Windows.h"
 #endif
+#include "cpp2c.h"
 
 bool err::get_errno_message(std::string &out, int errnum) {
 #if _WIN32
@@ -60,3 +61,11 @@ bool err::get_errno_message(std::string &out, int errnum) {
 #endif 
 #endif
 }
+
+char* err_get_errno_message(int errnum) {
+    std::string msg;
+    if (!err::get_errno_message(msg, errnum)) return nullptr;
+    char* tmp;
+    if (!cpp2c::string2char(msg, tmp)) return nullptr;
+    return tmp;
+}
diff --git a/err.h b/err.h
index e40f0f5..ffdd6fd 100644
--- a/err.h
+++ b/err.h
@@ -1,5 +1,6 @@
 #ifndef _UTILS_ERR_H
 #define _UTILS_ERR_H
+#if __cplusplus
 #include <string>
 
 namespace err {
@@ -11,4 +12,15 @@ namespace err {
     */
     bool get_errno_message(std::string &out, int errnum);
 }
+extern "C" {
+#endif
+/**
+ * @brief Get error message from errno
+ * @param errnum errno
+ * @return Output string. Need free memory by calling free.
+*/
+char* err_get_errno_message(int errnum);
+#if __cplusplus
+}
+#endif
 #endif