add copy function

libglacier.c

@@ -16,6 +16,7 @@
  */
 
 #include <color.h>
+#include <fcntl.h>
 #include <libconfig.h>
 #include <stdbool.h>
 #include <stdio.h>
@@ -153,6 +154,22 @@ load_setting_from_config()
 
 }
 
+int
+copy_file(char pkg[], char workpkg[])
+{
+	char cwd[PATH_MAX];
+	FILE *localpkg, *newpkg;
+
+	localpkg = fopen(pkg, "r");
+	newpkg = fopen(workpkg, "a+");
+
+	contents = fgetc(localpkg);
+	while (contents != EOF) {
+		fputc(contents, newpkg);
+		contents = fgetc(localpkg);
+	}
+}
+
 int
 main(int argc, char *argv[])
 {