gdb: Convert language la_emitchar field to a method

This commit changes the language_data::la_emitchar function pointer
member variable into a member function of language_defn.

There should be no user visible changes after this commit.

gdb/ChangeLog:

	* ada-lang.c (emit_char): Renamed to ada_language::emitchar.
	(ada_language_data): Delete la_emitchar initializer.
	(ada_language::emitchar): New member function, implementation from
	emit_char.
	* c-lang.c (c_language_data): Delete la_emitchar initializer.
	(cplus_language_data): Likewise.
	(asm_language_data): Likewise.
	(minimal_language_data): Likewise.
	* d-lang.c (d_language_data): Likewise.
	* f-lang.c (f_emit_char): Rename to f_language::emitchar.
	(f_language_data): Delete la_emitchar initializer.
	(f_language::emitchar): New member function, implementation from
	f_emit_char.
	* go-lang.c (go_language_data): Delete la_emitchar initializer.
	* language.c (unk_lang_emit_char): Delete.
	(language_defn::emitchar): New member function definition.
	(unknown_language_data): Delete la_emitchar initializer.
	(unknown_language::emitchar): New member function.
	(auto_language_data): Delete la_emitchar initializer.
	(auto_language::emitchar): New member function.
	* language.h (language_data): Delete la_emitchar field.
	(language_defn::emitchar): New member field declaration.
	(LA_EMIT_CHAR): Update call to emitchar.
	* m2-lang.c (m2_emit_char): Rename to m2_language::emitchar.
	(m2_language_data): Delete la_emitchar initializer.
	(m2_language::emitchar): New member function, implementation from
	m2_emit_char.
	* objc-lang.c (objc_language_data): Delete la_emitchar
	initializer.
	* opencl-lang.c (opencl_language_data): Likewise.
	* p-lang.c (pascal_emit_char): Rename to pascal_language::emitchar.
	(pascal_language_data): Delete la_emitchar initializer.
	(pascal_language::emitchar): New member function, implementation
	from pascal_emit_char.
	* rust-lang.c (rust_emitchar): Rename to rust_language::emitchar.
	(rust_language_data): Delete la_emitchar initializer.
	(rust_language::emitchar): New member function, implementation
	from rust_emitchar.

13 files changed, 173 insertions, 152 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 098014a..d402fb5 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,46 @@
 2020-06-23  Andrew Burgess  <andrew.burgess@embecosm.com>
 
+	* ada-lang.c (emit_char): Renamed to ada_language::emitchar.
+	(ada_language_data): Delete la_emitchar initializer.
+	(ada_language::emitchar): New member function, implementation from
+	emit_char.
+	* c-lang.c (c_language_data): Delete la_emitchar initializer.
+	(cplus_language_data): Likewise.
+	(asm_language_data): Likewise.
+	(minimal_language_data): Likewise.
+	* d-lang.c (d_language_data): Likewise.
+	* f-lang.c (f_emit_char): Rename to f_language::emitchar.
+	(f_language_data): Delete la_emitchar initializer.
+	(f_language::emitchar): New member function, implementation from
+	f_emit_char.
+	* go-lang.c (go_language_data): Delete la_emitchar initializer.
+	* language.c (unk_lang_emit_char): Delete.
+	(language_defn::emitchar): New member function definition.
+	(unknown_language_data): Delete la_emitchar initializer.
+	(unknown_language::emitchar): New member function.
+	(auto_language_data): Delete la_emitchar initializer.
+	(auto_language::emitchar): New member function.
+	* language.h (language_data): Delete la_emitchar field.
+	(language_defn::emitchar): New member field declaration.
+	(LA_EMIT_CHAR): Update call to emitchar.
+	* m2-lang.c (m2_emit_char): Rename to m2_language::emitchar.
+	(m2_language_data): Delete la_emitchar initializer.
+	(m2_language::emitchar): New member function, implementation from
+	m2_emit_char.
+	* objc-lang.c (objc_language_data): Delete la_emitchar
+	initializer.
+	* opencl-lang.c (opencl_language_data): Likewise.
+	* p-lang.c (pascal_emit_char): Rename to pascal_language::emitchar.
+	(pascal_language_data): Delete la_emitchar initializer.
+	(pascal_language::emitchar): New member function, implementation
+	from pascal_emit_char.
+	* rust-lang.c (rust_emitchar): Rename to rust_language::emitchar.
+	(rust_language_data): Delete la_emitchar initializer.
+	(rust_language::emitchar): New member function, implementation
+	from rust_emitchar.
+
+2020-06-23  Andrew Burgess  <andrew.burgess@embecosm.com>
+
 	* ada-lang.c (resolve): Rename to ada_language::post_parser.
 	(ada_language_data): Delete la_post_parser initializer.
 	(ada_language::post_parser): New member function.
diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index bb6d011..7858679 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -13504,14 +13504,6 @@ enum ada_primitive_types {
 
 				/* Language vector */
 
-/* Not really used, but needed in the ada_language_defn.  */
-
-static void
-emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
-{
-  ada_emit_char (c, type, stream, quoter, 1);
-}
-
 static const struct exp_descriptor ada_exp_descriptor = {
   ada_print_subexp,
   ada_operator_length,
@@ -13691,7 +13683,6 @@ extern const struct language_data ada_language_data =
   &ada_exp_descriptor,
   ada_printchar,                /* Print a character constant */
   ada_printstr,                 /* Function to print string constant */
-  emit_char,                    /* Function to print single char (not used) */
   ada_print_typedef,            /* Print a typedef using appropriate syntax */
   NULL,                         /* name_of_this */
   true,                         /* la_store_sym_names_in_linkage_form_p */
@@ -14116,6 +14107,14 @@ public:
     resolve_subexp (expp, &pc, 1, context_type, completing, tracker);
   }
 
+  /* See language.h.  */
+
+  void emitchar (int ch, struct type *chtype,
+		 struct ui_file *stream, int quoter) const override
+  {
+    ada_emit_char (ch, chtype, stream, quoter, 1);
+  }
+
 protected:
   /* See language.h.  */
 
diff --git a/gdb/c-lang.c b/gdb/c-lang.c
index 363c896..fbd564d 100644
--- a/gdb/c-lang.c
+++ b/gdb/c-lang.c
@@ -891,7 +891,6 @@ extern const struct language_data c_language_data =
   &exp_descriptor_c,
   c_printchar,			/* Print a character constant */
   c_printstr,			/* Function to print string constant */
-  c_emit_char,			/* Print a single char */
   c_print_typedef,		/* Print a typedef using appropriate syntax */
   NULL,				/* name_of_this */
   true,				/* la_store_sym_names_in_linkage_form_p */
@@ -997,7 +996,6 @@ extern const struct language_data cplus_language_data =
   &exp_descriptor_c,
   c_printchar,			/* Print a character constant */
   c_printstr,			/* Function to print string constant */
-  c_emit_char,			/* Print a single char */
   c_print_typedef,		/* Print a typedef using appropriate syntax */
   "this",                       /* name_of_this */
   false,			/* la_store_sym_names_in_linkage_form_p */
@@ -1200,7 +1198,6 @@ extern const struct language_data asm_language_data =
   &exp_descriptor_c,
   c_printchar,			/* Print a character constant */
   c_printstr,			/* Function to print string constant */
-  c_emit_char,			/* Print a single char */
   c_print_typedef,		/* Print a typedef using appropriate syntax */
   NULL,				/* name_of_this */
   true,				/* la_store_sym_names_in_linkage_form_p */
@@ -1261,7 +1258,6 @@ extern const struct language_data minimal_language_data =
   &exp_descriptor_c,
   c_printchar,			/* Print a character constant */
   c_printstr,			/* Function to print string constant */
-  c_emit_char,			/* Print a single char */
   c_print_typedef,		/* Print a typedef using appropriate syntax */
   NULL,				/* name_of_this */
   true,				/* la_store_sym_names_in_linkage_form_p */
diff --git a/gdb/d-lang.c b/gdb/d-lang.c
index facc82c..fa6df33 100644
--- a/gdb/d-lang.c
+++ b/gdb/d-lang.c
@@ -144,7 +144,6 @@ extern const struct language_data d_language_data =
   &exp_descriptor_c,
   c_printchar,			/* Print a character constant.  */
   c_printstr,			/* Function to print string constant.  */
-  c_emit_char,			/* Print a single char.  */
   c_print_typedef,		/* Print a typedef using appropriate
 				   syntax.  */
   "this",
diff --git a/gdb/f-lang.c b/gdb/f-lang.c
index 1b545b2..90b2e86 100644
--- a/gdb/f-lang.c
+++ b/gdb/f-lang.c
@@ -42,8 +42,6 @@
 /* Local functions */
 
 static void f_printchar (int c, struct type *type, struct ui_file * stream);
-static void f_emit_char (int c, struct type *type,
-			 struct ui_file * stream, int quoter);
 
 /* Return the encoding that should be used for the character type
    TYPE.  */
@@ -72,20 +70,6 @@ f_get_encoding (struct type *type)
   return encoding;
 }
 
-/* Print the character C on STREAM as part of the contents of a literal
-   string whose delimiter is QUOTER.  Note that that format for printing
-   characters and strings is language specific.
-   FIXME:  This is a copy of the same function from c-exp.y.  It should
-   be replaced with a true F77 version.  */
-
-static void
-f_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
-{
-  const char *encoding = f_get_encoding (type);
-
-  generic_emit_char (c, type, stream, quoter, encoding);
-}
-
 /* Implementation of la_printchar.  */
 
 static void
@@ -566,7 +550,6 @@ extern const struct language_data f_language_data =
   &exp_descriptor_f,
   f_printchar,			/* Print character constant */
   f_printstr,			/* function to print string constant */
-  f_emit_char,			/* Function to print a single character */
   f_print_typedef,		/* Print a typedef using appropriate syntax */
   NULL,                    	/* name_of_this */
   false,			/* la_store_sym_names_in_linkage_form_p */
@@ -718,6 +701,15 @@ public:
     return f_parse (ps);
   }
 
+  /* See language.h.  */
+
+  void emitchar (int ch, struct type *chtype,
+		 struct ui_file *stream, int quoter) const override
+  {
+    const char *encoding = f_get_encoding (chtype);
+    generic_emit_char (ch, chtype, stream, quoter, encoding);
+  }
+
 protected:
 
   /* See language.h.  */
diff --git a/gdb/go-lang.c b/gdb/go-lang.c
index c26dee9..f167543 100644
--- a/gdb/go-lang.c
+++ b/gdb/go-lang.c
@@ -529,7 +529,6 @@ extern const struct language_data go_language_data =
   &exp_descriptor_c,
   c_printchar,			/* Print a character constant.  */
   c_printstr,			/* Function to print string constant.  */
-  c_emit_char,			/* Print a single char.  */
   c_print_typedef,		/* Print a typedef using appropriate
 				   syntax.  */
   NULL,				/* name_of_this */
diff --git a/gdb/language.c b/gdb/language.c
index 72fa1e4..6778646b 100644
--- a/gdb/language.c
+++ b/gdb/language.c
@@ -49,9 +49,6 @@
 
 static void set_range_case (void);
 
-static void unk_lang_emit_char (int c, struct type *type,
-				struct ui_file *stream, int quoter);
-
 static void unk_lang_printchar (int c, struct type *type,
 				struct ui_file *stream);
 
@@ -657,6 +654,15 @@ language_defn::value_print_inner
   return c_value_print_inner (val, stream, recurse, options);
 }
 
+/* See language.h.  */
+
+void
+language_defn::emitchar (int ch, struct type *chtype,
+			 struct ui_file * stream, int quoter) const
+{
+  c_emit_char (ch, chtype, stream, quoter);
+}
+
 /* The default implementation of the get_symbol_name_matcher_inner method
    from the language_defn class.  Matches with strncmp_iw.  */
 
@@ -722,16 +728,6 @@ default_is_string_type_p (struct type *type)
   return (type->code ()  == TYPE_CODE_STRING);
 }
 
-/* Define the language that is no language.  */
-
-static void
-unk_lang_emit_char (int c, struct type *type, struct ui_file *stream,
-		    int quoter)
-{
-  error (_("internal error - unimplemented "
-	   "function unk_lang_emit_char called."));
-}
-
 static void
 unk_lang_printchar (int c, struct type *type, struct ui_file *stream)
 {
@@ -779,7 +775,6 @@ extern const struct language_data unknown_language_data =
   &exp_descriptor_standard,
   unk_lang_printchar,		/* Print character constant */
   unk_lang_printstr,
-  unk_lang_emit_char,
   default_print_typedef,	/* Print a typedef using appropriate syntax */
   "this",        	    	/* name_of_this */
   true,				/* store_sym_names_in_linkage_form_p */
@@ -848,6 +843,14 @@ public:
     /* No parsing is done, just claim success.  */
     return 1;
   }
+
+  /* See language.h.  */
+
+  void emitchar (int ch, struct type *chtype,
+		 struct ui_file *stream, int quoter) const override
+  {
+    error (_("unimplemented unknown_language::emitchar called"));
+  }
 };
 
 /* Single instance of the unknown language class.  */
@@ -869,7 +872,6 @@ extern const struct language_data auto_language_data =
   &exp_descriptor_standard,
   unk_lang_printchar,		/* Print character constant */
   unk_lang_printstr,
-  unk_lang_emit_char,
   default_print_typedef,	/* Print a typedef using appropriate syntax */
   "this",		        /* name_of_this */
   false,			/* store_sym_names_in_linkage_form_p */
@@ -938,6 +940,14 @@ public:
     /* No parsing is done, just claim success.  */
     return 1;
   }
+
+  /* See language.h.  */
+
+  void emitchar (int ch, struct type *chtype,
+		 struct ui_file *stream, int quoter) const override
+  {
+    error (_("unimplemented auto_language::emitchar called"));
+  }
 };
 
 /* Single instance of the fake "auto" language.  */
diff --git a/gdb/language.h b/gdb/language.h
index d5b106d..612afb3 100644
--- a/gdb/language.h
+++ b/gdb/language.h
@@ -233,9 +233,6 @@ struct language_data
 			 const char *encoding, int force_ellipses,
 			 const struct value_print_options *);
 
-    void (*la_emitchar) (int ch, struct type *chtype,
-			 struct ui_file * stream, int quoter);
-
     /* Print a typedef using syntax appropriate for this language.
        TYPE is the underlying type.  NEW_SYMBOL is the symbol naming
        the type.  STREAM is the output stream on which to print.  */
@@ -544,6 +541,12 @@ struct language_defn : language_data
     /* By default the post-parser does nothing.  */
   }
 
+  /* Print the character CH (of type CHTYPE) on STREAM as part of the
+     contents of a literal string whose delimiter is QUOTER.  */
+
+  virtual void emitchar (int ch, struct type *chtype,
+			 struct ui_file *stream, int quoter) const;
+
 protected:
 
   /* This is the overridable part of the GET_SYMBOL_NAME_MATCHER method.
@@ -651,7 +654,7 @@ extern enum language set_language (enum language);
   (current_language->la_printstr(stream, elttype, string, length, \
 				 encoding, force_ellipses,options))
 #define LA_EMIT_CHAR(ch, type, stream, quoter) \
-  (current_language->la_emitchar(ch, type, stream, quoter))
+  (current_language->emitchar (ch, type, stream, quoter))
 
 #define LA_PRINT_ARRAY_INDEX(index_type, index_value, stream, options)	\
   (current_language->print_array_index(index_type, index_value, stream, \
diff --git a/gdb/m2-lang.c b/gdb/m2-lang.c
index 5aca833..d8f7f00 100644
--- a/gdb/m2-lang.c
+++ b/gdb/m2-lang.c
@@ -30,59 +30,6 @@
 #include "gdbarch.h"
 
 static void m2_printchar (int, struct type *, struct ui_file *);
-static void m2_emit_char (int, struct type *, struct ui_file *, int);
-
-/* Print the character C on STREAM as part of the contents of a literal
-   string whose delimiter is QUOTER.  Note that that format for printing
-   characters and strings is language specific.
-   FIXME:  This is a copy of the same function from c-exp.y.  It should
-   be replaced with a true Modula version.  */
-
-static void
-m2_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
-{
-
-  c &= 0xFF;			/* Avoid sign bit follies.  */
-
-  if (PRINT_LITERAL_FORM (c))
-    {
-      if (c == '\\' || c == quoter)
-	{
-	  fputs_filtered ("\\", stream);
-	}
-      fprintf_filtered (stream, "%c", c);
-    }
-  else
-    {
-      switch (c)
-	{
-	case '\n':
-	  fputs_filtered ("\\n", stream);
-	  break;
-	case '\b':
-	  fputs_filtered ("\\b", stream);
-	  break;
-	case '\t':
-	  fputs_filtered ("\\t", stream);
-	  break;
-	case '\f':
-	  fputs_filtered ("\\f", stream);
-	  break;
-	case '\r':
-	  fputs_filtered ("\\r", stream);
-	  break;
-	case '\033':
-	  fputs_filtered ("\\e", stream);
-	  break;
-	case '\007':
-	  fputs_filtered ("\\a", stream);
-	  break;
-	default:
-	  fprintf_filtered (stream, "\\%.3o", (unsigned int) c);
-	  break;
-	}
-    }
-}
 
 /* FIXME:  This is a copy of the same function from c-exp.y.  It should
    be replaced with a true Modula version.  */
@@ -364,7 +311,6 @@ extern const struct language_data m2_language_data =
   &exp_descriptor_modula2,
   m2_printchar,			/* Print character constant */
   m2_printstr,			/* function to print string constant */
-  m2_emit_char,			/* Function to print a single character */
   m2_print_typedef,		/* Print a typedef using appropriate syntax */
   NULL,		                /* name_of_this */
   false,			/* la_store_sym_names_in_linkage_form_p */
@@ -435,6 +381,51 @@ public:
   {
     return m2_parse (ps);
   }
+
+  /* See language.h.  */
+
+  void emitchar (int ch, struct type *chtype,
+		 struct ui_file *stream, int quoter) const override
+  {
+    ch &= 0xFF;			/* Avoid sign bit follies.  */
+
+    if (PRINT_LITERAL_FORM (ch))
+      {
+	if (ch == '\\' || ch == quoter)
+	  fputs_filtered ("\\", stream);
+	fprintf_filtered (stream, "%c", ch);
+      }
+    else
+      {
+	switch (ch)
+	  {
+	  case '\n':
+	    fputs_filtered ("\\n", stream);
+	    break;
+	  case '\b':
+	    fputs_filtered ("\\b", stream);
+	    break;
+	  case '\t':
+	    fputs_filtered ("\\t", stream);
+	    break;
+	  case '\f':
+	    fputs_filtered ("\\f", stream);
+	    break;
+	  case '\r':
+	    fputs_filtered ("\\r", stream);
+	    break;
+	  case '\033':
+	    fputs_filtered ("\\e", stream);
+	    break;
+	  case '\007':
+	    fputs_filtered ("\\a", stream);
+	    break;
+	  default:
+	    fprintf_filtered (stream, "\\%.3o", (unsigned int) ch);
+	    break;
+	  }
+      }
+  }
 };
 
 /* Single instance of the M2 language.  */
diff --git a/gdb/objc-lang.c b/gdb/objc-lang.c
index 2ec8777..ffde14a 100644
--- a/gdb/objc-lang.c
+++ b/gdb/objc-lang.c
@@ -339,7 +339,6 @@ extern const struct language_data objc_language_data =
   &exp_descriptor_standard,
   c_printchar,		       /* Print a character constant */
   c_printstr,		       /* Function to print string constant */
-  c_emit_char,
   c_print_typedef,		/* Print a typedef using appropriate syntax */
   "self",		        /* name_of_this */
   false,			/* la_store_sym_names_in_linkage_form_p */
diff --git a/gdb/opencl-lang.c b/gdb/opencl-lang.c
index f314eff..3789c21 100644
--- a/gdb/opencl-lang.c
+++ b/gdb/opencl-lang.c
@@ -1018,7 +1018,6 @@ extern const struct language_data opencl_language_data =
   &exp_descriptor_opencl,
   c_printchar,			/* Print a character constant */
   c_printstr,			/* Function to print string constant */
-  c_emit_char,			/* Print a single char */
   c_print_typedef,		/* Print a typedef using appropriate syntax */
   NULL,                         /* name_of_this */
   false,			/* la_store_sym_names_in_linkage_form_p */
diff --git a/gdb/p-lang.c b/gdb/p-lang.c
index 14ca5d7..b0465f4 100644
--- a/gdb/p-lang.c
+++ b/gdb/p-lang.c
@@ -192,23 +192,6 @@ pascal_one_char (int c, struct ui_file *stream, int *in_quotes)
     }
 }
 
-static void pascal_emit_char (int c, struct type *type,
-			      struct ui_file *stream, int quoter);
-
-/* Print the character C on STREAM as part of the contents of a literal
-   string whose delimiter is QUOTER.  Note that that format for printing
-   characters and strings is language specific.  */
-
-static void
-pascal_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
-{
-  int in_quotes = 0;
-
-  pascal_one_char (c, stream, &in_quotes);
-  if (in_quotes)
-    fputs_filtered ("'", stream);
-}
-
 void
 pascal_printchar (int c, struct type *type, struct ui_file *stream)
 {
@@ -395,7 +378,6 @@ extern const struct language_data pascal_language_data =
   &exp_descriptor_standard,
   pascal_printchar,		/* Print a character constant */
   pascal_printstr,		/* Function to print string constant */
-  pascal_emit_char,		/* Print a single char */
   pascal_print_typedef,		/* Print a typedef using appropriate syntax */
   "this",		        /* name_of_this */
   false,			/* la_store_sym_names_in_linkage_form_p */
@@ -497,6 +479,18 @@ public:
   {
     return pascal_parse (ps);
   }
+
+  /* See language.h.  */
+
+  void emitchar (int ch, struct type *chtype,
+		 struct ui_file *stream, int quoter) const override
+  {
+    int in_quotes = 0;
+
+    pascal_one_char (ch, stream, &in_quotes);
+    if (in_quotes)
+      fputs_filtered ("'", stream);
+  }
 };
 
 /* Single instance of the Pascal language class.  */
diff --git a/gdb/rust-lang.c b/gdb/rust-lang.c
index 846fe1f..2d6cb8b 100644
--- a/gdb/rust-lang.c
+++ b/gdb/rust-lang.c
@@ -281,32 +281,6 @@ rust_get_trait_object_pointer (struct value *value)
 
 
 
-/* la_emitchar implementation for Rust.  */
-
-static void
-rust_emitchar (int c, struct type *type, struct ui_file *stream, int quoter)
-{
-  if (!rust_chartype_p (type))
-    generic_emit_char (c, type, stream, quoter,
-		       target_charset (get_type_arch (type)));
-  else if (c == '\\' || c == quoter)
-    fprintf_filtered (stream, "\\%c", c);
-  else if (c == '\n')
-    fputs_filtered ("\\n", stream);
-  else if (c == '\r')
-    fputs_filtered ("\\r", stream);
-  else if (c == '\t')
-    fputs_filtered ("\\t", stream);
-  else if (c == '\0')
-    fputs_filtered ("\\0", stream);
-  else if (c >= 32 && c <= 127 && isprint (c))
-    fputc_filtered (c, stream);
-  else if (c <= 255)
-    fprintf_filtered (stream, "\\x%02x", c);
-  else
-    fprintf_filtered (stream, "\\u{%06x}", c);
-}
-
 /* la_printchar implementation for Rust.  */
 
 static void
@@ -1991,7 +1965,6 @@ extern const struct language_data rust_language_data =
   &exp_descriptor_rust,
   rust_printchar,		/* Print a character constant */
   rust_printstr,		/* Function to print string constant */
-  rust_emitchar,		/* Print a single char */
   rust_print_typedef,		/* Print a typedef using appropriate syntax */
   NULL,				/* name_of_this */
   false,			/* la_store_sym_names_in_linkage_form_p */
@@ -2147,6 +2120,32 @@ public:
   {
     return rust_parse (ps);
   }
+
+  /* See language.h.  */
+
+  void emitchar (int ch, struct type *chtype,
+		 struct ui_file *stream, int quoter) const override
+  {
+    if (!rust_chartype_p (chtype))
+      generic_emit_char (ch, chtype, stream, quoter,
+			 target_charset (get_type_arch (chtype)));
+    else if (ch == '\\' || ch == quoter)
+      fprintf_filtered (stream, "\\%c", ch);
+    else if (ch == '\n')
+      fputs_filtered ("\\n", stream);
+    else if (ch == '\r')
+      fputs_filtered ("\\r", stream);
+    else if (ch == '\t')
+      fputs_filtered ("\\t", stream);
+    else if (ch == '\0')
+      fputs_filtered ("\\0", stream);
+    else if (ch >= 32 && ch <= 127 && isprint (ch))
+      fputc_filtered (ch, stream);
+    else if (ch <= 255)
+      fprintf_filtered (stream, "\\x%02x", ch);
+    else
+      fprintf_filtered (stream, "\\u{%06x}", ch);
+  }
 };
 
 /* Single instance of the Rust language class.  */