Add %option nodefault to all our flex lexers. Fix a couple of rule gaps

exposed thereby.  AFAICT these would not lead to any worse problems than
junk emitted on the backend's stdout, but we should have the option to
catch possible worse errors in future.

contrib/cube/cubescan.l

@@ -26,6 +26,7 @@ void cube_scanner_finish(void);
 
 %option 8bit
 %option never-interactive
+%option nodefault
 %option nounput
 %option noyywrap
 %option prefix="cube_yy"
@@ -44,7 +45,7 @@ float        ({integer}|{real})([eE]{integer})?
 \(           yylval = "("; return O_PAREN;
 \)           yylval = ")"; return C_PAREN;
 \,           yylval = ")"; return COMMA;
-[ ]+         /* discard spaces */
+[ \t\n\r\f]+ /* discard spaces */
 .            return yytext[0]; /* alert parser of the garbage */
 
 %%

contrib/seg/segscan.l

@@ -25,6 +25,7 @@ void seg_scanner_finish(void);
 
 %option 8bit
 %option never-interactive
+%option nodefault
 %option nounput
 %option noyywrap
 %option prefix="seg_yy"
@@ -44,7 +45,7 @@ float        ({integer}|{real})([eE]{integer})?
 \<           yylval.text = "<"; return EXTENSION;
 \>           yylval.text = ">"; return EXTENSION;
 \~           yylval.text = "~"; return EXTENSION;
-[ ]+         /* discard spaces */
+[ \t\n\r\f]+ /* discard spaces */
 .            return yytext[0]; /* alert parser of the garbage */
 
 %%

contrib/tsearch/parser.l

@@ -16,6 +16,7 @@ YY_BUFFER_STATE buf = NULL; /* buffer to parse; it need for parse from string */
 
 %option 8bit
 %option never-interactive
+%option nodefault
 %option nounput
 %option noyywrap
 

contrib/tsearch2/wordparser/parser.l

@@ -18,6 +18,7 @@ YY_BUFFER_STATE buf = NULL; /* buffer to parse; it need for parse from string */
 
 %option 8bit
 %option never-interactive
+%option nodefault
 %option nounput
 %option noyywrap
 

src/backend/bootstrap/bootscanner.l

@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/bootstrap/bootscanner.l,v 1.32 2003/11/29 19:51:41 pgsql Exp $
+ *	  $PostgreSQL: pgsql/src/backend/bootstrap/bootscanner.l,v 1.33 2004/02/24 22:06:32 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -53,6 +53,7 @@ static int	yyline;  /* keep track of the line number for error reporting */
 
 %option 8bit
 %option never-interactive
+%option nodefault
 %option nounput
 %option noyywrap
 

src/backend/utils/misc/guc-file.l

@@ -4,7 +4,7 @@
  *
  * Copyright (c) 2000-2003, PostgreSQL Global Development Group
  *
- * $PostgreSQL: pgsql/src/backend/utils/misc/guc-file.l,v 1.20 2003/11/29 19:52:03 pgsql Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/misc/guc-file.l,v 1.21 2004/02/24 22:06:32 tgl Exp $
  */
 
 %{
@@ -47,6 +47,7 @@ char *GUC_scanstr(char *);
 
 %option 8bit
 %option never-interactive
+%option nodefault
 %option nounput
 %option noyywrap
 

src/interfaces/ecpg/preproc/pgc.l

@@ -12,7 +12,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/pgc.l,v 1.125 2004/02/15 13:48:54 meskes Exp $
+ *	  $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/pgc.l,v 1.126 2004/02/24 22:06:32 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -70,6 +70,7 @@ static struct _if_value
 
 %option 8bit
 %option never-interactive
+%option nodefault
 %option noyywrap
 
 %option yylineno

src/pl/plpgsql/src/scan.l

@@ -4,7 +4,7 @@
  *			  procedural language
  *
  * IDENTIFICATION
- *    $PostgreSQL: pgsql/src/pl/plpgsql/src/scan.l,v 1.30 2003/11/29 19:52:12 pgsql Exp $
+ *    $PostgreSQL: pgsql/src/pl/plpgsql/src/scan.l,v 1.31 2004/02/24 22:06:32 tgl Exp $
  *
  *    This software is copyrighted by Jan Wieck - Hamburg.
  *
@@ -63,6 +63,7 @@ int	plpgsql_SpaceScanned = 0;
 
 %option 8bit
 %option never-interactive
+%option nodefault
 %option nounput
 %option noyywrap
 
@@ -272,6 +273,7 @@ dump			{ return O_DUMP;			}
 			  BEGIN IN_STRING;
 			}
 <IN_STRING>\\.		{ }
+<IN_STRING>\\		{ /* can only happen with \ at EOF */ }
 <IN_STRING>''		{ }
 <IN_STRING>'		{
 			  yyleng -= (yytext - start_charpos);
@@ -279,13 +281,13 @@ dump			{ return O_DUMP;			}
 			  BEGIN INITIAL;
 			  return T_STRING;
 			}
+<IN_STRING>[^'\\]+	{ }
 <IN_STRING><<EOF>>	{
 				plpgsql_error_lineno = start_lineno;
 				ereport(ERROR,
 						(errcode(ERRCODE_DATATYPE_MISMATCH),
 						 errmsg("unterminated string")));
 			}
-<IN_STRING>[^'\\]*	{ }
 
     /* ----------
      * Any unmatched character is returned as is