Don't include libunistring headers in Guile public headers

This requres the creation of a new type
scm_t_string_failed_conversion_handler to replace libunistring's
enum iconveh_ilseq_handler.

* libguile/strings.h: don't include <uniconv.h>
(scm_t_string_failed_conversion_handler): new enum type
(SCM_FAILED_CONVERSION_ERROR, SCM_FAILED_CONVERSION_QUESTION_MARK):
(SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE): new enum type values

* libguile/strings.c (scm_to_stringn): now takes type
scm_t_string_failed_conversion_handler.  All callers changed.

* libguile/print.c: include <uniconv.h>

* libguile/ports.c (scm_lfwrite_substr): use
scm_t_string_conversion_handler's constants

* libguile/gen-scmconfig.c (SCM_ICONVEH_ERROR):
(SCM_ICONVEH_QUESTION_MARK, SCM_ICONVEH_ESCAPE_SEQUENCE): store
iconveh_ilseq_hander constants as #define's

libguile/gen-scmconfig.c

@@ -125,6 +125,7 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <uniconv.h>
 
 #define pf printf
 
@@ -424,6 +425,14 @@ main (int argc, char *argv[])
 
   pf ("#define SCM_HAVE_ARRAYS 1 /* always true now */\n");
 
+  pf ("\n");
+  pf ("/* Constants from uniconv.h.  */\n");
+  pf ("#define SCM_ICONVEH_ERROR %d\n", (int) iconveh_error);
+  pf ("#define SCM_ICONVEH_QUESTION_MARK %d\n", 
+      (int) iconveh_question_mark);
+  pf ("#define SCM_ICONVEH_ESCAPE_SEQUENCE %d\n",
+      (int) iconveh_escape_sequence);  
+
   printf ("#endif\n");
 
   return 0;

libguile/ports.c

@@ -1024,7 +1024,7 @@ scm_lfwrite_substr (SCM str, size_t start, size_t end, SCM port)
   size = end - start;
 
   buf = scm_to_stringn (scm_c_substring (str, start, end), &len,
-			NULL, iconveh_escape_sequence);
+			NULL, SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE);
   ptob->write (port, buf, len);
   free (buf);
 

libguile/print.c

@@ -23,6 +23,7 @@
 #endif
 
 #include <errno.h>
+#include <uniconv.h>
 #include <unictype.h>
 
 #include "libguile/_scm.h"

libguile/strings.c

@@ -26,6 +26,7 @@
 #include <stdio.h>
 #include <ctype.h>
 #include <unistr.h>
+#include <uniconv.h>
 
 #include "libguile/_scm.h"
 #include "libguile/chars.h"
@@ -1473,13 +1474,14 @@ scm_to_locale_stringn (SCM str, size_t * lenp)
   /* In the future, enc will hold the port's encoding.  */
   enc = NULL;
 
-  return scm_to_stringn (str, lenp, enc, iconveh_escape_sequence);
+  return scm_to_stringn (str, lenp, enc, 
+                         SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE);
 }
 
 /* Low-level scheme to C string conversion function.  */
 char *
 scm_to_stringn (SCM str, size_t * lenp, const char *encoding,
-                enum iconv_ilseq_handler handler)
+                scm_t_string_failed_conversion_handler handler)
 {
   static const char iso[11] = "ISO-8859-1";
   char *buf;
@@ -1527,14 +1529,14 @@ scm_to_stringn (SCM str, size_t * lenp, const char *encoding,
   buf = NULL;
   len = 0;
   buf = u32_conv_to_encoding (iso,
-                              handler,
+                              (enum iconv_ilseq_handler) handler,
                               (scm_t_uint32 *) scm_i_string_wide_chars (str),
                               ilen, NULL, NULL, &len);
   if (buf == NULL)
     scm_misc_error (NULL, "cannot convert to output locale ~s: \"~s\"",
                     scm_list_2 (scm_from_locale_string (iso), str));
 
-  if (handler == iconveh_escape_sequence)
+  if (handler == SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE)
     unistring_escapes_to_guile_escapes (&buf, &len);
 
   if (lenp)

libguile/strings.h

@@ -3,7 +3,7 @@
 #ifndef SCM_STRINGS_H
 #define SCM_STRINGS_H
 
-/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2004, 2005, 2006, 2008 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2004, 2005, 2006, 2008, 2009 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
@@ -23,7 +23,6 @@
 
 
 
-#include <uniconv.h>
 #include "libguile/__scm.h"
 
 
@@ -90,6 +89,15 @@
      no wide version of this interface.
 */
 
+/* A type indicating what strategy to take when string locale
+   conversion is unsuccessful.  */
+typedef enum
+{
+  SCM_FAILED_CONVERSION_ERROR = SCM_ICONVEH_ERROR,
+  SCM_FAILED_CONVERSION_QUESTION_MARK = SCM_ICONVEH_QUESTION_MARK,
+  SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE = SCM_ICONVEH_ESCAPE_SEQUENCE
+} scm_t_string_failed_conversion_handler;
+
 SCM_API SCM scm_string_p (SCM x);
 SCM_API SCM scm_string (SCM chrs);
 SCM_API SCM scm_make_string (SCM k, SCM chr);
@@ -122,7 +130,8 @@ SCM_API char *scm_to_locale_string (SCM str);
 SCM_API char *scm_to_locale_stringn (SCM str, size_t *lenp);
 SCM_INTERNAL char *scm_to_stringn (SCM str, size_t *lenp, 
                                    const char *encoding,
-                                   enum iconv_ilseq_handler handler);
+                                   scm_t_string_failed_conversion_handler
+                                   handler);
 SCM_API size_t scm_to_locale_stringbuf (SCM str, char *buf, size_t max_len);
 
 SCM_API SCM scm_makfromstrs (int argc, char **argv);