From cd28936cf092e2d5cc361bb503b5bfb920fbcb5f Mon Sep 17 00:00:00 2001
From: Dave Brolley <brolley@cygnus.com>
Date: Mon, 7 Jun 1999 11:10:29 +0000
Subject: [PATCH] lex.c (real_yylex): Replace unused bytes from bad multibyte
 char.

1999-06-07  Dave Brolley  <brolley@cygnus.com>
	* lex.c (real_yylex): Replace unused bytes from bad multibyte char.
	* input.c (putback_buffer): New structure type.
	(putback): Replaces putback_char member.
	(putback): Replaces putback_char static variable.
	(feed_input): Use putback.
	(end_input): Use putback.
	(sub_getch): Use putback.
	(put_back): Use putback.

From-SVN: r27392
---
 gcc/cp/ChangeLog | 11 +++++++++++
 gcc/cp/input.c   | 35 ++++++++++++++++++++++++-----------
 gcc/cp/lex.c     | 43 ++++++++++++++++++++++++++-----------------
 3 files changed, 61 insertions(+), 28 deletions(-)

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index a066e3b98a2..e89dfdff1a2 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,14 @@
+1999-06-07  Dave Brolley  <brolley@cygnus.com>
+
+	* lex.c (real_yylex): Replace unused bytes from bad multibyte char.
+	* input.c (putback_buffer): New structure type.
+	(putback): Replaces putback_char member.
+	(putback): Replaces putback_char static variable.
+	(feed_input): Use putback.
+	(end_input): Use putback.
+	(sub_getch): Use putback.
+	(put_back): Use putback.
+
 1999-06-05  Mark Mitchell  <mark@codesourcery.com>
 
 	* decl.c (grokdeclarator): Fix typo in last change.
diff --git a/gcc/cp/input.c b/gcc/cp/input.c
index 9148c865623..b7fb9e2db37 100644
--- a/gcc/cp/input.c
+++ b/gcc/cp/input.c
@@ -33,6 +33,12 @@ Boston, MA 02111-1307, USA.  */
 
 extern FILE *finput;
 
+struct putback_buffer {
+  char *buffer;
+  int   buffer_size;
+  int   index;
+};
+
 struct input_source {
   /* saved string */
   char *str;
@@ -45,7 +51,7 @@ struct input_source {
   char *filename;
   int lineno;
   struct pending_input *input;
-  int putback_char;
+  struct putback_buffer putback;
 };
 
 static struct input_source *input, *free_inputs;
@@ -98,7 +104,7 @@ free_input (inp)
   free_inputs = inp;
 }
 
-static int putback_char = -1;
+static struct putback_buffer putback = {NULL, 0, -1};
 
 /* Some of these external functions are declared inline in case this file
    is included in lex.c.  */
@@ -122,8 +128,10 @@ feed_input (str, len)
   inp->filename = input_filename;
   inp->lineno = lineno;
   inp->input = save_pending_input ();
-  inp->putback_char = putback_char;
-  putback_char = -1;
+  inp->putback = putback;
+  putback.buffer = NULL;
+  putback.buffer_size = 0;
+  putback.index = -1;
   input = inp;
 }
 
@@ -141,7 +149,7 @@ end_input ()
   lineno = inp->lineno;
   /* Get interface/implementation back in sync.  */
   extract_interface_info ();
-  putback_char = inp->putback_char;
+  putback = inp->putback;
   restore_pending_input (inp->input);
   free_input (inp);
 }
@@ -149,17 +157,17 @@ end_input ()
 static inline int
 sub_getch ()
 {
-  if (putback_char != -1)
+  if (putback.index != -1)
     {
-      int ch = putback_char;
-      putback_char = -1;
+      int ch = putback.buffer[putback.index];
+      --putback.index;
       return ch;
     }
   if (input)
     {
       if (input->offset >= input->length)
 	{
-	  my_friendly_assert (putback_char == -1, 223);
+	  my_friendly_assert (putback.index == -1, 223);
 	  ++(input->offset);
 	  if (input->offset - input->length < 64)
 	    return EOF;
@@ -180,8 +188,13 @@ put_back (ch)
 {
   if (ch != EOF)
     {
-      my_friendly_assert (putback_char == -1, 224);
-      putback_char = ch;
+      if (putback.index == putback.buffer_size - 1)
+	{
+	  putback.buffer_size += 16;
+	  putback.buffer = xrealloc (putback.buffer, putback.buffer_size);
+	}
+      my_friendly_assert (putback.buffer != NULL, 224);
+      putback.buffer[++putback.index] = ch;
     }
 }
 
diff --git a/gcc/cp/lex.c b/gcc/cp/lex.c
index 80f855ede3b..1ab5df3a304 100644
--- a/gcc/cp/lex.c
+++ b/gcc/cp/lex.c
@@ -4074,12 +4074,17 @@ real_yylex ()
 		else
 		  {
 		    if (char_len == -1)
-		      warning ("Ignoring invalid multibyte character");
-		    if (wide_flag)
-		      c = wc;
+		      {
+			warning ("Ignoring invalid multibyte character");
+			/* Replace all but the first byte.  */
+			for (--i; i > 1; --i)
+			  put_back (token_buffer[i]);
+			wc = token_buffer[1];
+		      }
 #ifdef MAP_CHARACTER
-		    else
-		      c = MAP_CHARACTER (c);
+		      c = MAP_CHARACTER (wc);
+#else
+		      c = wc;
 #endif
 		  }
 #else /* ! MULTIBYTE_CHARS */
@@ -4203,20 +4208,24 @@ real_yylex ()
 		    c = getch ();
 		  }
 		if (char_len == -1)
-		  warning ("Ignoring invalid multibyte character");
-		else
 		  {
-		    /* mbtowc sometimes needs an extra char before accepting */
-		    if (char_len <= i)
-		      put_back (c);
-		    if (! wide_flag)
-		      {
-			p += (i + 1);
-			c = getch ();
-			continue;
-		      }
-		    c = wc;
+		    warning ("Ignoring invalid multibyte character");
+		    /* Replace all except the first byte.  */
+		    put_back (c);
+		    for (--i; i > 0; --i)
+		      put_back (p[i]);
+		    char_len = 1;
+		  }
+		/* mbtowc sometimes needs an extra char before accepting */
+		if (char_len <= i)
+		  put_back (c);
+		if (! wide_flag)
+		  {
+		    p += (i + 1);
+		    c = getch ();
+		    continue;
 		  }
+		c = wc;
 #endif /* MULTIBYTE_CHARS */
 	      }
 
-- 
2.30.2