add function fc_delete_file_ex

HISTORY

@@ -4,6 +4,7 @@ Version 1.43  2019-12-25
     system is the deprecated function in iOS 11
   * correct function skiplist_iterator in skiplist.h
   * add buffered_file_writer.[hc]
+  * add function fc_delete_file_ex
 
 Version 1.42  2019-12-03
   * add function get_gzip_command_filename

src/shared_func.c

@@ -2866,3 +2866,29 @@ const char *get_gzip_command_filename()
         return "gzip";
     }
 }
+
+int fc_delete_file_ex(const char *filename, const char *caption)
+{
+    int result;
+
+    if (unlink(filename) == 0)
+    {
+        return 0;
+    }
+
+    result = errno != 0 ? errno : ENOENT;
+    if (result == ENOENT)
+    {
+        result = 0;
+    }
+    else
+    {
+        logError("file: "__FILE__", line: %d, "
+                "unlink %s file: %s fail, "
+                "errno: %d, error info: %s",
+                __LINE__, caption, filename,
+                result, STRERROR(result));
+    }
+
+    return result;
+}

src/shared_func.h

@@ -856,6 +856,19 @@ char *resolve_path(const char *from, const char *filename,
 */
 const char *get_gzip_command_filename();
 
+/** delete file
+ *  parameters:
+ *      filename: the filename to delete
+ *      caption: the caption of this filename
+ *  return: error no, 0 success, != 0 fail
+*/
+int fc_delete_file_ex(const char *filename, const char *caption);
+
+static inline int fc_delete_file(const char *filename)
+{
+    return fc_delete_file_ex(filename, "");
+}
+
 #ifdef __cplusplus
 }
 #endif