diff --git a/src/C_interface.jl b/src/C_interface.jl
index c906908..569e1aa 100644
--- a/src/C_interface.jl
+++ b/src/C_interface.jl
@@ -26,3 +26,39 @@ end
 function readstat_variable_get_index(variable::Ptr{Nothing})
     return ccall((:readstat_variable_get_index, libreadstat), Cint, (Ptr{Nothing},), variable)
 end
+
+function readstat_writer_init()
+    return ccall((:readstat_writer_init, libreadstat), Ptr{Cvoid}, ())
+end
+
+function readstat_set_data_writer(writer, data_writer)
+    return ccall((:readstat_set_data_writer, libreadstat), Cvoid, (Ptr{Cvoid},Ptr{Cvoid}), (writer, data_writer))
+end
+
+function readstat_add_variable(writer, name, typ)
+    return ccall((:readstat_add_variable, libreadstat), Ptr{Cvoid}, (Ptr{Cvoid}, Cstring, UInt), writer, name, typ)
+end
+
+function readstat_begin_writing_dta(writer, user_ctx, row_count)
+    return ccall((:readstat_begin_writing_dta, libreadstat), UInt, (Ptr{Cvoid}, Ptr{Cvoid}, Clong), writer, user_ctx, row_count)
+end
+
+function readstat_begin_row(writer)
+    return ccall((:readstat_begin_row, libreadstat), UInt, (Ptr{Cvoid},), writer)
+end
+
+function readstat_insert_double_value(writer, variable, value)
+    return ccall((:readstat_insert_double_value, libreadstat), UInt, (Ptr{Cvoid},Ptr{Cvoid},Cdouble), writer, variable, value)
+end
+
+function readstat_end_row(writer)
+    return ccall((:readstat_end_row, libreadstat), UInt, (Ptr{Cvoid},), writer)
+end
+
+function readstat_end_writing(writer)
+    return ccall((:readstat_end_writing, libreadstat), UInt, (Ptr{Cvoid},), writer)
+end
+
+function readstat_writer_free(writer)
+    return ccall((:readstat_writer_free, libreadstat), UInt, (Ptr{Cvoid},), writer)
+end
\ No newline at end of file