gdb

	* c-lang.c (c_emit_char): Use INTERMEDIATE_ENCODING.
	(c_printstr): Likewise.
	* charset.c: Include gdb_wait.h.
	(make_wchar_iterator): Use INTERMEDIATE_ENCODING.
	(find_charset_names): Use pexecute.  Handle libiconv's output.
	Detect errors.
	(_initialize_charset): Use xstrdup.
	* gdb_wchar.h: Check HAVE_BTOWC.  Split PHONY_ICONV and wchar
	cases.
	(INTERMEDIATE_ENCODING): New define.
	* configure, config.in: Rebuild.
	* configure.ac: Check for btowc.
gdb/doc
	* gdb.texinfo (Character Sets): Document default character set.

1 files changed, 38 insertions, 10 deletions

diff --git a/gdb/gdb_wchar.h b/gdb/gdb_wchar.h
index 583140e..07a6c87 100644
--- a/gdb/gdb_wchar.h
+++ b/gdb/gdb_wchar.h
@@ -19,13 +19,36 @@
 #ifndef GDB_WCHAR_H
 #define GDB_WCHAR_H
 
-/* If this host has wchar_t and if iconv is available (perhaps via GNU
-   libiconv), then we arrange to use those.  Otherwise, we provide a
-   phony iconv which only handles a single character set, and we
-   provide wrappers for the wchar_t functionality we use.  */
-#if defined(HAVE_ICONV) && defined(HAVE_WCHAR_H)
-
+/* We handle three different modes here.
+   
+   Capable systems have the full suite: wchar_t support and iconv
+   (perhaps via GNU libiconv).  On these machines, full functionality
+   is available.
+   
+   DJGPP is known to have libiconv but not wchar_t support.  On
+   systems like this, we use the narrow character functions.  The full
+   functionality is available to the user, but many characters (those
+   outside the narrow range) will be displayed as escapes.
+   
+   Finally, some systems do not have iconv.  Here we provide a phony
+   iconv which only handles a single character set, and we provide
+   wrappers for the wchar_t functionality we use.  */
+
+
+#define INTERMEDIATE_ENCODING "wchar_t"
+
+#if defined (HAVE_ICONV)
 #include <iconv.h>
+#else
+/* This define is used elsewhere so we don't need to duplicate the
+   same checking logic in multiple places.  */
+#define PHONY_ICONV
+#endif
+
+/* We use "btowc" as a sentinel to detect functioning wchar_t
+   support.  */
+#if defined (HAVE_ICONV) && defined (HAVE_WCHAR_H) && defined (HAVE_BTOWC)
+
 #include <wchar.h>
 #include <wctype.h>
 
@@ -53,10 +76,15 @@ typedef int gdb_wint_t;
 
 #define LCST(X) X
 
-/* This define is used elsewhere so we don't need to duplicate the
-   same checking logic in multiple places.  */
-#define PHONY_ICONV
+/* If we are using the narrow character set, we want to use the host
+   narrow encoding as our intermediate encoding.  However, if we are
+   also providing a phony iconv, we might as well just stick with
+   "wchar_t".  */
+#ifndef PHONY_ICONV
+#undef INTERMEDIATE_ENCODING
+#define INTERMEDIATE_ENCODING host_charset ()
+#endif
 
-#endif /* defined(HAVE_ICONV) && defined(HAVE_WCHAR_H) */
+#endif
 
 #endif /* GDB_WCHAR_H */