scm_mkstrport: Optimize the POS -> BYTE_POS conversion.

* libguile/strports.c (scm_mkstrport): Use 'scm_c_string_utf8_length' to
avoid the conversion to UTF-8.

diff --git a/libguile/strports.c b/libguile/strports.c
index 876a62a8640572d31bed5886002127d614f68ada..14cdfa06b48f0a085e3918c61f13686984187cee 100644 (file)
--- a/libguile/strports.c
+++ b/libguile/strports.c
@@ -195,8 +195,8 @@ scm_mkstrport (SCM pos, SCM str, long modes, const char *caller)
       else
         /* Inefficient but simple way to convert the character position
            POS into a byte position BYTE_POS.  */
-        free (scm_to_utf8_stringn (scm_substring (str, SCM_INUM0, pos),
-                                   &byte_pos));
+        byte_pos = scm_c_string_utf8_length
+          (scm_substring (str, SCM_INUM0, pos));
     }
 
   stream = scm_gc_typed_calloc (struct string_port);