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diff --git a/guile18/libguile/convert.c b/guile18/libguile/convert.c
new file mode 100644
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--- /dev/null
+++ b/guile18/libguile/convert.c
@@ -0,0 +1,146 @@
+/* Copyright (C) 2002, 2006 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "libguile/_scm.h"
+#include "libguile/validate.h"
+#include "libguile/strings.h"
+#include "libguile/vectors.h"
+#include "libguile/pairs.h"
+#include "libguile/unif.h"
+#include "libguile/srfi-4.h"
+
+#include "libguile/convert.h"
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+/* char *scm_c_scm2chars (SCM obj, char *dst);
+   SCM   scm_c_chars2scm (const char *src, long n);
+   SCM   scm_c_chars2byvect (const char *src, long n);
+*/
+
+#define CTYPE            char
+#define FROM_CTYPE       scm_from_char
+#define SCM2CTYPES       scm_c_scm2chars
+#define CTYPES2SCM       scm_c_chars2scm
+#define CTYPES2UVECT     scm_c_chars2byvect
+#if CHAR_MIN == 0
+/* 'char' is unsigned. */
+#define UVEC_TAG         u8
+#define UVEC_CTYPE       scm_t_uint8
+#else
+/* 'char' is signed. */
+#define UVEC_TAG         s8
+#define UVEC_CTYPE       scm_t_int8
+#endif
+#include "libguile/convert.i.c"
+
+/* short *scm_c_scm2shorts (SCM obj, short *dst);
+   SCM scm_c_shorts2scm (const short *src, long n);
+   SCM scm_c_shorts2svect (const short *src, long n);
+*/
+
+#define CTYPE            short
+#define FROM_CTYPE       scm_from_short
+#define SCM2CTYPES       scm_c_scm2shorts
+#define CTYPES2SCM       scm_c_shorts2scm
+#define CTYPES2UVECT     scm_c_shorts2svect
+#define UVEC_TAG         s16
+#define UVEC_CTYPE       scm_t_int16
+#include "libguile/convert.i.c"
+
+/* int *scm_c_scm2ints (SCM obj, int *dst);
+   SCM scm_c_ints2scm (const int *src, long n);
+   SCM scm_c_ints2ivect (const int *src, long n);
+   SCM scm_c_uints2uvect (const unsigned int *src, long n);
+*/
+
+#define CTYPE            int
+#define FROM_CTYPE       scm_from_int
+#define SCM2CTYPES       scm_c_scm2ints
+#define CTYPES2SCM       scm_c_ints2scm
+#define CTYPES2UVECT     scm_c_ints2ivect
+#define UVEC_TAG         s32
+#define UVEC_CTYPE       scm_t_int32
+
+#define CTYPES2UVECT_2   scm_c_uints2uvect
+#define CTYPE_2          unsigned int
+#define UVEC_TAG_2       u32
+#define UVEC_CTYPE_2     scm_t_uint32
+
+#include "libguile/convert.i.c"
+
+/* long *scm_c_scm2longs (SCM obj, long *dst);
+   SCM scm_c_longs2scm (const long *src, long n);
+   SCM scm_c_longs2ivect (const long *src, long n);
+   SCM scm_c_ulongs2uvect (const unsigned long *src, long n);
+*/
+
+#define CTYPE            long
+#define FROM_CTYPE       scm_from_long
+#define SCM2CTYPES       scm_c_scm2longs
+#define CTYPES2SCM       scm_c_longs2scm
+#define CTYPES2UVECT     scm_c_longs2ivect
+#define UVEC_TAG         s32
+#define UVEC_CTYPE       scm_t_int32
+
+#define CTYPES2UVECT_2   scm_c_ulongs2uvect
+#define CTYPE_2          unsigned int
+#define UVEC_TAG_2       u32
+#define UVEC_CTYPE_2     scm_t_uint32
+
+#include "libguile/convert.i.c"
+
+/* float *scm_c_scm2floats (SCM obj, float *dst);
+   SCM scm_c_floats2scm (const float *src, long n);
+   SCM scm_c_floats2fvect (const float *src, long n);
+*/
+
+#define CTYPE            float
+#define FROM_CTYPE       scm_from_double
+#define SCM2CTYPES       scm_c_scm2floats
+#define CTYPES2SCM       scm_c_floats2scm
+#define CTYPES2UVECT     scm_c_floats2fvect
+#define UVEC_TAG         f32
+#define UVEC_CTYPE       float
+#include "libguile/convert.i.c"
+
+/* double *scm_c_scm2doubles (SCM obj, double *dst);
+   SCM scm_c_doubles2scm (const double *src, long n);
+   SCM scm_c_doubles2dvect (const double *src, long n);
+*/
+
+#define CTYPE            double
+#define FROM_CTYPE       scm_from_double
+#define SCM2CTYPES       scm_c_scm2doubles
+#define CTYPES2SCM       scm_c_doubles2scm
+#define CTYPES2UVECT     scm_c_doubles2dvect
+#define UVEC_TAG         f64
+#define UVEC_CTYPE       double
+#include "libguile/convert.i.c"
+
+/*
+  Local Variables:
+  c-file-style: "gnu"
+  End:
+*/