[PATCH] kconfig: improve error handling in the parser

Add a few error tokens to the parser to catch common errors and print more
descriptive error messages.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

6 files changed, 515 insertions, 421 deletions

diff --git a/scripts/kconfig/lex.zconf.c_shipped b/scripts/kconfig/lex.zconf.c_shipped
index bedba89..24e3c8c 100644
--- a/scripts/kconfig/lex.zconf.c_shipped
+++ b/scripts/kconfig/lex.zconf.c_shipped
@@ -323,7 +323,7 @@ void zconffree (void *  );
 
 /* Begin user sect3 */
 
-#define zconfwrap(n) 1
+#define zconfwrap() 1
 #define YY_SKIP_YYWRAP
 
 typedef unsigned char YY_CHAR;
@@ -686,10 +686,10 @@ struct yy_trans_info
 static yyconst flex_int16_t yy_accept[61] =
     {   0,
         0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
-       34,    5,    4,    3,    2,    7,    8,    6,   32,   29,
+       34,    5,    4,    2,    3,    7,    8,    6,   32,   29,
        31,   24,   28,   27,   26,   22,   17,   13,   16,   20,
-       22,   11,   12,   19,   19,   14,   22,   22,    4,    3,
-        2,    2,    1,    6,   32,   29,   31,   30,   24,   23,
+       22,   11,   12,   19,   19,   14,   22,   22,    4,    2,
+        3,    3,    1,    6,   32,   29,   31,   30,   24,   23,
        26,   25,   15,   20,    9,   19,   19,   21,   10,   18
     } ;
 
@@ -753,6 +753,11 @@ char *zconftext;
 
 #define START_STRSIZE	16
 
+static struct {
+	struct file *file;
+	int lineno;
+} current_pos;
+
 static char *text;
 static int text_size, text_asize;
 
@@ -766,7 +771,7 @@ struct buffer *current_buf;
 static int last_ts, first_ts;
 
 static void zconf_endhelp(void);
-static struct buffer *zconf_endfile(void);
+static void zconf_endfile(void);
 
 void new_string(void)
 {
@@ -993,17 +998,17 @@ do_action:	/* This label is used only to access EOF actions. */
 	{ /* beginning of action switch */
 case 1:
 /* rule 1 can match eol */
-YY_RULE_SETUP
-current_file->lineno++;
-	YY_BREAK
 case 2:
+/* rule 2 can match eol */
 YY_RULE_SETUP
-
+{
+	current_file->lineno++;
+	return T_EOL;
+}
 	YY_BREAK
 case 3:
-/* rule 3 can match eol */
 YY_RULE_SETUP
-current_file->lineno++; return T_EOL;
+
 	YY_BREAK
 case 4:
 YY_RULE_SETUP
@@ -1023,8 +1028,10 @@ case 6:
 YY_RULE_SETUP
 {
 		struct kconf_id *id = kconf_id_lookup(zconftext, zconfleng);
+		BEGIN(PARAM);
+		current_pos.file = current_file;
+		current_pos.lineno = current_file->lineno;
 		if (id && id->flags & TF_COMMAND) {
-			BEGIN(PARAM);
 			zconflval.id = id;
 			return id->token;
 		}
@@ -1040,7 +1047,11 @@ YY_RULE_SETUP
 case 8:
 /* rule 8 can match eol */
 YY_RULE_SETUP
-current_file->lineno++; BEGIN(INITIAL);
+{
+		BEGIN(INITIAL);
+		current_file->lineno++;
+		return T_EOL;
+	}
 	YY_BREAK
 
 case 9:
@@ -1246,9 +1257,9 @@ case YY_STATE_EOF(HELP):
 case YY_STATE_EOF(INITIAL):
 case YY_STATE_EOF(COMMAND):
 {
-	if (current_buf) {
+	if (current_file) {
 		zconf_endfile();
-		return T_EOF;
+		return T_EOL;
 	}
 	fclose(zconfin);
 	yyterminate();
@@ -1958,7 +1969,7 @@ YY_BUFFER_STATE zconf_scan_buffer  (char * base, yy_size_t  size )
 
 /** Setup the input buffer state to scan a string. The next call to zconflex() will
  * scan from a @e copy of @a str.
- * @param str a NUL-terminated string to scan
+ * @param yy_str a NUL-terminated string to scan
  * 
  * @return the newly allocated buffer state object.
  * @note If you want to scan bytes that may contain NUL values, then use
@@ -2276,7 +2287,7 @@ void zconf_nextfile(const char *name)
 	current_file = file;
 }
 
-static struct buffer *zconf_endfile(void)
+static void zconf_endfile(void)
 {
 	struct buffer *parent;
 
@@ -2292,23 +2303,15 @@ static struct buffer *zconf_endfile(void)
 	}
 	free(current_buf);
 	current_buf = parent;
-
-	return parent;
 }
 
 int zconf_lineno(void)
 {
-	if (current_buf)
-		return current_file->lineno - 1;
-	else
-		return 0;
+	return current_pos.lineno;
 }
 
 char *zconf_curname(void)
 {
-	if (current_buf)
-		return current_file->name;
-	else
-		return "<none>";
+	return current_pos.file ? current_pos.file->name : "<none>";
 }
 
diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index 91491d0..ca02eb4 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -70,7 +70,7 @@ void kconfig_load(void);
 
 /* menu.c */
 void menu_init(void);
-void menu_add_menu(void);
+struct menu *menu_add_menu(void);
 void menu_end_menu(void);
 void menu_add_entry(struct symbol *sym);
 void menu_end_entry(void);
diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index c2a423a..0fce20c 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -61,10 +61,11 @@ void menu_end_entry(void)
 {
 }
 
-void menu_add_menu(void)
+struct menu *menu_add_menu(void)
 {
-	current_menu = current_entry;
+	menu_end_entry();
 	last_entry_ptr = &current_entry->list;
+	return current_menu = current_entry;
 }
 
 void menu_end_menu(void)
diff --git a/scripts/kconfig/zconf.l b/scripts/kconfig/zconf.l
index cfcfabd..cfa4607 100644
--- a/scripts/kconfig/zconf.l
+++ b/scripts/kconfig/zconf.l
@@ -18,6 +18,11 @@
 
 #define START_STRSIZE	16
 
+static struct {
+	struct file *file;
+	int lineno;
+} current_pos;
+
 static char *text;
 static int text_size, text_asize;
 
@@ -31,7 +36,7 @@ struct buffer *current_buf;
 static int last_ts, first_ts;
 
 static void zconf_endhelp(void);
-static struct buffer *zconf_endfile(void);
+static void zconf_endfile(void);
 
 void new_string(void)
 {
@@ -70,10 +75,13 @@ n	[A-Za-z0-9_]
 	int str = 0;
 	int ts, i;
 
-[ \t]*#.*\n	current_file->lineno++;
+[ \t]*#.*\n	|
+[ \t]*\n	{
+	current_file->lineno++;
+	return T_EOL;
+}
 [ \t]*#.*
 
-[ \t]*\n	current_file->lineno++; return T_EOL;
 
 [ \t]+	{
 	BEGIN(COMMAND);
@@ -88,8 +96,10 @@ n	[A-Za-z0-9_]
 <COMMAND>{
 	{n}+	{
 		struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
+		BEGIN(PARAM);
+		current_pos.file = current_file;
+		current_pos.lineno = current_file->lineno;
 		if (id && id->flags & TF_COMMAND) {
-			BEGIN(PARAM);
 			zconflval.id = id;
 			return id->token;
 		}
@@ -98,7 +108,11 @@ n	[A-Za-z0-9_]
 		return T_WORD;
 	}
 	.
-	\n	current_file->lineno++; BEGIN(INITIAL);
+	\n	{
+		BEGIN(INITIAL);
+		current_file->lineno++;
+		return T_EOL;
+	}
 }
 
 <PARAM>{
@@ -214,9 +228,9 @@ n	[A-Za-z0-9_]
 }
 
 <<EOF>>	{
-	if (current_buf) {
+	if (current_file) {
 		zconf_endfile();
-		return T_EOF;
+		return T_EOL;
 	}
 	fclose(yyin);
 	yyterminate();
@@ -307,7 +321,7 @@ void zconf_nextfile(const char *name)
 	current_file = file;
 }
 
-static struct buffer *zconf_endfile(void)
+static void zconf_endfile(void)
 {
 	struct buffer *parent;
 
@@ -323,22 +337,14 @@ static struct buffer *zconf_endfile(void)
 	}
 	free(current_buf);
 	current_buf = parent;
-
-	return parent;
 }
 
 int zconf_lineno(void)
 {
-	if (current_buf)
-		return current_file->lineno - 1;
-	else
-		return 0;
+	return current_pos.lineno;
 }
 
 char *zconf_curname(void)
 {
-	if (current_buf)
-		return current_file->name;
-	else
-		return "<none>";
+	return current_pos.file ? current_pos.file->name : "<none>";
 }
diff --git a/scripts/kconfig/zconf.tab.c_shipped b/scripts/kconfig/zconf.tab.c_shipped
index 3fc2962..ea7755d 100644
--- a/scripts/kconfig/zconf.tab.c_shipped
+++ b/scripts/kconfig/zconf.tab.c_shipped
@@ -89,11 +89,10 @@
      T_CLOSE_PAREN = 283,
      T_OPEN_PAREN = 284,
      T_EOL = 285,
-     T_EOF = 286,
-     T_OR = 287,
-     T_AND = 288,
-     T_EQUAL = 289,
-     T_NOT = 290
+     T_OR = 286,
+     T_AND = 287,
+     T_EQUAL = 288,
+     T_NOT = 289
    };
 #endif
 #define T_MAINMENU 258
@@ -124,11 +123,10 @@
 #define T_CLOSE_PAREN 283
 #define T_OPEN_PAREN 284
 #define T_EOL 285
-#define T_EOF 286
-#define T_OR 287
-#define T_AND 288
-#define T_EQUAL 289
-#define T_NOT 290
+#define T_OR 286
+#define T_AND 287
+#define T_EQUAL 288
+#define T_NOT 289
 
 
 
@@ -162,14 +160,18 @@ int cdebug = PRINTD;
 
 extern int zconflex(void);
 static void zconfprint(const char *err, ...);
+static void zconf_error(const char *err, ...);
 static void zconferror(const char *err);
-static bool zconf_endtoken(int token, int starttoken, int endtoken);
+static bool zconf_endtoken(struct kconf_id *id, int starttoken, int endtoken);
 
 struct symbol *symbol_hash[257];
 
 static struct menu *current_menu, *current_entry;
 
+#define YYDEBUG 0
+#if YYDEBUG
 #define YYERROR_VERBOSE
+#endif
 
 
 /* Enabling traces.  */
@@ -188,8 +190,8 @@ static struct menu *current_menu, *current_entry;
 #if ! defined (YYSTYPE) && ! defined (YYSTYPE_IS_DECLARED)
 
 typedef union YYSTYPE {
-	int token;
 	char *string;
+	struct file *file;
 	struct symbol *symbol;
 	struct expr *expr;
 	struct menu *menu;
@@ -308,22 +310,22 @@ union yyalloc
 #endif
 
 /* YYFINAL -- State number of the termination state. */
-#define YYFINAL  2
+#define YYFINAL  3
 /* YYLAST -- Last index in YYTABLE.  */
-#define YYLAST   179
+#define YYLAST   264
 
 /* YYNTOKENS -- Number of terminals. */
-#define YYNTOKENS  36
+#define YYNTOKENS  35
 /* YYNNTS -- Number of nonterminals. */
-#define YYNNTS  41
+#define YYNNTS  42
 /* YYNRULES -- Number of rules. */
-#define YYNRULES  97
+#define YYNRULES  104
 /* YYNRULES -- Number of states. */
-#define YYNSTATES  159
+#define YYNSTATES  175
 
 /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
 #define YYUNDEFTOK  2
-#define YYMAXUTOK   290
+#define YYMAXUTOK   289
 
 #define YYTRANSLATE(YYX) 						\
   ((unsigned int) (YYX) <= YYMAXUTOK ? yytranslate[YYX] : YYUNDEFTOK)
@@ -359,8 +361,7 @@ static const unsigned char yytranslate[] =
        2,     2,     2,     2,     2,     2,     1,     2,     3,     4,
        5,     6,     7,     8,     9,    10,    11,    12,    13,    14,
       15,    16,    17,    18,    19,    20,    21,    22,    23,    24,
-      25,    26,    27,    28,    29,    30,    31,    32,    33,    34,
-      35
+      25,    26,    27,    28,    29,    30,    31,    32,    33,    34
 };
 
 #if YYDEBUG
@@ -368,65 +369,70 @@ static const unsigned char yytranslate[] =
    YYRHS.  */
 static const unsigned short int yyprhs[] =
 {
-       0,     0,     3,     4,     7,     9,    11,    13,    17,    19,
-      21,    23,    26,    28,    30,    32,    34,    36,    38,    42,
-      45,    49,    52,    53,    56,    59,    62,    65,    69,    74,
-      79,    84,    90,    93,    96,    98,   102,   105,   106,   109,
-     112,   115,   118,   123,   127,   130,   135,   136,   139,   143,
-     145,   149,   152,   153,   156,   159,   162,   166,   169,   171,
-     175,   178,   179,   182,   185,   188,   192,   196,   198,   202,
-     205,   208,   211,   212,   215,   218,   223,   227,   231,   232,
-     235,   237,   239,   242,   245,   248,   250,   252,   253,   256,
-     258,   262,   266,   270,   273,   277,   281,   283
+       0,     0,     3,     5,     6,     9,    12,    15,    20,    23,
+      28,    33,    37,    39,    41,    43,    45,    47,    49,    51,
+      53,    55,    57,    59,    61,    63,    67,    70,    74,    77,
+      81,    84,    85,    88,    91,    94,    97,   100,   104,   109,
+     114,   119,   125,   128,   131,   133,   137,   138,   141,   144,
+     147,   150,   153,   158,   162,   165,   170,   171,   174,   178,
+     180,   184,   185,   188,   191,   194,   198,   201,   203,   207,
+     208,   211,   214,   217,   221,   225,   228,   231,   234,   235,
+     238,   241,   244,   249,   253,   257,   258,   261,   263,   265,
+     268,   271,   274,   276,   279,   280,   283,   285,   289,   293,
+     297,   300,   304,   308,   310
 };
 
 /* YYRHS -- A `-1'-separated list of the rules' RHS. */
 static const yysigned_char yyrhs[] =
 {
-      37,     0,    -1,    -1,    37,    38,    -1,    39,    -1,    49,
-      -1,    60,    -1,     3,    71,    73,    -1,     5,    -1,    15,
-      -1,     8,    -1,     1,    73,    -1,    55,    -1,    65,    -1,
-      41,    -1,    43,    -1,    63,    -1,    73,    -1,    10,    25,
-      30,    -1,    40,    44,    -1,    11,    25,    30,    -1,    42,
-      44,    -1,    -1,    44,    45,    -1,    44,    69,    -1,    44,
-      67,    -1,    44,    30,    -1,    20,    70,    30,    -1,    19,
-      71,    74,    30,    -1,    21,    75,    74,    30,    -1,    22,
-      25,    74,    30,    -1,    23,    76,    76,    74,    30,    -1,
-       7,    30,    -1,    46,    50,    -1,    72,    -1,    47,    52,
-      48,    -1,    47,    52,    -1,    -1,    50,    51,    -1,    50,
-      69,    -1,    50,    67,    -1,    50,    30,    -1,    19,    71,
-      74,    30,    -1,    20,    70,    30,    -1,    18,    30,    -1,
-      21,    25,    74,    30,    -1,    -1,    52,    39,    -1,    14,
-      75,    30,    -1,    72,    -1,    53,    56,    54,    -1,    53,
-      56,    -1,    -1,    56,    39,    -1,    56,    60,    -1,    56,
-      49,    -1,     4,    71,    30,    -1,    57,    68,    -1,    72,
-      -1,    58,    61,    59,    -1,    58,    61,    -1,    -1,    61,
-      39,    -1,    61,    60,    -1,    61,    49,    -1,    61,     1,
-      30,    -1,     6,    71,    30,    -1,    62,    -1,     9,    71,
-      30,    -1,    64,    68,    -1,    12,    30,    -1,    66,    13,
-      -1,    -1,    68,    69,    -1,    68,    30,    -1,    16,    24,
-      75,    30,    -1,    16,    75,    30,    -1,    17,    75,    30,
-      -1,    -1,    71,    74,    -1,    25,    -1,    26,    -1,     5,
-      73,    -1,     8,    73,    -1,    15,    73,    -1,    30,    -1,
-      31,    -1,    -1,    14,    75,    -1,    76,    -1,    76,    34,
-      76,    -1,    76,    27,    76,    -1,    29,    75,    28,    -1,
-      35,    75,    -1,    75,    32,    75,    -1,    75,    33,    75,
-      -1,    25,    -1,    26,    -1
+      36,     0,    -1,    37,    -1,    -1,    37,    39,    -1,    37,
+      50,    -1,    37,    61,    -1,    37,     3,    71,    73,    -1,
+      37,    72,    -1,    37,    25,     1,    30,    -1,    37,    38,
+       1,    30,    -1,    37,     1,    30,    -1,    16,    -1,    19,
+      -1,    20,    -1,    22,    -1,    18,    -1,    23,    -1,    21,
+      -1,    30,    -1,    56,    -1,    65,    -1,    42,    -1,    44,
+      -1,    63,    -1,    25,     1,    30,    -1,     1,    30,    -1,
+      10,    25,    30,    -1,    41,    45,    -1,    11,    25,    30,
+      -1,    43,    45,    -1,    -1,    45,    46,    -1,    45,    69,
+      -1,    45,    67,    -1,    45,    40,    -1,    45,    30,    -1,
+      20,    70,    30,    -1,    19,    71,    74,    30,    -1,    21,
+      75,    74,    30,    -1,    22,    25,    74,    30,    -1,    23,
+      76,    76,    74,    30,    -1,     7,    30,    -1,    47,    51,
+      -1,    72,    -1,    48,    53,    49,    -1,    -1,    51,    52,
+      -1,    51,    69,    -1,    51,    67,    -1,    51,    30,    -1,
+      51,    40,    -1,    19,    71,    74,    30,    -1,    20,    70,
+      30,    -1,    18,    30,    -1,    21,    25,    74,    30,    -1,
+      -1,    53,    39,    -1,    14,    75,    73,    -1,    72,    -1,
+      54,    57,    55,    -1,    -1,    57,    39,    -1,    57,    61,
+      -1,    57,    50,    -1,     4,    71,    30,    -1,    58,    68,
+      -1,    72,    -1,    59,    62,    60,    -1,    -1,    62,    39,
+      -1,    62,    61,    -1,    62,    50,    -1,     6,    71,    30,
+      -1,     9,    71,    30,    -1,    64,    68,    -1,    12,    30,
+      -1,    66,    13,    -1,    -1,    68,    69,    -1,    68,    30,
+      -1,    68,    40,    -1,    16,    24,    75,    30,    -1,    16,
+      75,    30,    -1,    17,    75,    30,    -1,    -1,    71,    74,
+      -1,    25,    -1,    26,    -1,     5,    30,    -1,     8,    30,
+      -1,    15,    30,    -1,    30,    -1,    73,    30,    -1,    -1,
+      14,    75,    -1,    76,    -1,    76,    33,    76,    -1,    76,
+      27,    76,    -1,    29,    75,    28,    -1,    34,    75,    -1,
+      75,    31,    75,    -1,    75,    32,    75,    -1,    25,    -1,
+      26,    -1
 };
 
 /* YYRLINE[YYN] -- source line where rule number YYN was defined.  */
 static const unsigned short int yyrline[] =
 {
-       0,    92,    92,    93,    96,    97,    98,    99,   100,   101,
-     102,   103,   107,   108,   109,   110,   111,   112,   118,   126,
-     132,   140,   150,   152,   153,   154,   155,   158,   166,   172,
-     182,   188,   196,   205,   211,   220,   221,   227,   229,   230,
-     231,   232,   235,   241,   252,   258,   268,   270,   275,   284,
-     293,   294,   300,   302,   303,   304,   309,   316,   322,   331,
-     332,   338,   340,   341,   342,   343,   346,   352,   359,   366,
-     373,   379,   386,   387,   388,   391,   396,   401,   409,   411,
-     416,   417,   420,   421,   422,   426,   426,   428,   429,   432,
-     433,   434,   435,   436,   437,   438,   441,   442
+       0,   103,   103,   105,   107,   108,   109,   110,   111,   112,
+     113,   117,   121,   121,   121,   121,   121,   121,   121,   125,
+     126,   127,   128,   129,   130,   134,   135,   141,   149,   155,
+     163,   173,   175,   176,   177,   178,   179,   182,   190,   196,
+     206,   212,   220,   229,   234,   242,   245,   247,   248,   249,
+     250,   251,   254,   260,   271,   277,   287,   289,   294,   302,
+     310,   313,   315,   316,   317,   322,   329,   334,   342,   345,
+     347,   348,   349,   352,   360,   367,   374,   380,   387,   389,
+     390,   391,   394,   399,   404,   412,   414,   419,   420,   423,
+     424,   425,   429,   430,   433,   434,   437,   438,   439,   440,
+     441,   442,   443,   446,   447
 };
 #endif
 
@@ -440,16 +446,16 @@ static const char *const yytname[] =
   "T_MENUCONFIG", "T_HELP", "T_HELPTEXT", "T_IF", "T_ENDIF", "T_DEPENDS",
   "T_REQUIRES", "T_OPTIONAL", "T_PROMPT", "T_TYPE", "T_DEFAULT",
   "T_SELECT", "T_RANGE", "T_ON", "T_WORD", "T_WORD_QUOTE", "T_UNEQUAL",
-  "T_CLOSE_PAREN", "T_OPEN_PAREN", "T_EOL", "T_EOF", "T_OR", "T_AND",
-  "T_EQUAL", "T_NOT", "$accept", "input", "block", "common_block",
-  "config_entry_start", "config_stmt", "menuconfig_entry_start",
-  "menuconfig_stmt", "config_option_list", "config_option", "choice",
-  "choice_entry", "choice_end", "choice_stmt", "choice_option_list",
-  "choice_option", "choice_block", "if", "if_end", "if_stmt", "if_block",
-  "menu", "menu_entry", "menu_end", "menu_stmt", "menu_block", "source",
-  "source_stmt", "comment", "comment_stmt", "help_start", "help",
-  "depends_list", "depends", "prompt_stmt_opt", "prompt", "end",
-  "nl_or_eof", "if_expr", "expr", "symbol", 0
+  "T_CLOSE_PAREN", "T_OPEN_PAREN", "T_EOL", "T_OR", "T_AND", "T_EQUAL",
+  "T_NOT", "$accept", "input", "stmt_list", "option_name", "common_stmt",
+  "option_error", "config_entry_start", "config_stmt",
+  "menuconfig_entry_start", "menuconfig_stmt", "config_option_list",
+  "config_option", "choice", "choice_entry", "choice_end", "choice_stmt",
+  "choice_option_list", "choice_option", "choice_block", "if_entry",
+  "if_end", "if_stmt", "if_block", "menu", "menu_entry", "menu_end",
+  "menu_stmt", "menu_block", "source_stmt", "comment", "comment_stmt",
+  "help_start", "help", "depends_list", "depends", "prompt_stmt_opt",
+  "prompt", "end", "nl", "if_expr", "expr", "symbol", 0
 };
 #endif
 
@@ -461,38 +467,40 @@ static const unsigned short int yytoknum[] =
        0,   256,   257,   258,   259,   260,   261,   262,   263,   264,
      265,   266,   267,   268,   269,   270,   271,   272,   273,   274,
      275,   276,   277,   278,   279,   280,   281,   282,   283,   284,
-     285,   286,   287,   288,   289,   290
+     285,   286,   287,   288,   289
 };
 # endif
 
 /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
 static const unsigned char yyr1[] =
 {
-       0,    36,    37,    37,    38,    38,    38,    38,    38,    38,
-      38,    38,    39,    39,    39,    39,    39,    39,    40,    41,
-      42,    43,    44,    44,    44,    44,    44,    45,    45,    45,
-      45,    45,    46,    47,    48,    49,    49,    50,    50,    50,
-      50,    50,    51,    51,    51,    51,    52,    52,    53,    54,
-      55,    55,    56,    56,    56,    56,    57,    58,    59,    60,
-      60,    61,    61,    61,    61,    61,    62,    63,    64,    65,
-      66,    67,    68,    68,    68,    69,    69,    69,    70,    70,
-      71,    71,    72,    72,    72,    73,    73,    74,    74,    75,
-      75,    75,    75,    75,    75,    75,    76,    76
+       0,    35,    36,    37,    37,    37,    37,    37,    37,    37,
+      37,    37,    38,    38,    38,    38,    38,    38,    38,    39,
+      39,    39,    39,    39,    39,    40,    40,    41,    42,    43,
+      44,    45,    45,    45,    45,    45,    45,    46,    46,    46,
+      46,    46,    47,    48,    49,    50,    51,    51,    51,    51,
+      51,    51,    52,    52,    52,    52,    53,    53,    54,    55,
+      56,    57,    57,    57,    57,    58,    59,    60,    61,    62,
+      62,    62,    62,    63,    64,    65,    66,    67,    68,    68,
+      68,    68,    69,    69,    69,    70,    70,    71,    71,    72,
+      72,    72,    73,    73,    74,    74,    75,    75,    75,    75,
+      75,    75,    75,    76,    76
 };
 
 /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
 static const unsigned char yyr2[] =
 {
-       0,     2,     0,     2,     1,     1,     1,     3,     1,     1,
-       1,     2,     1,     1,     1,     1,     1,     1,     3,     2,
-       3,     2,     0,     2,     2,     2,     2,     3,     4,     4,
-       4,     5,     2,     2,     1,     3,     2,     0,     2,     2,
+       0,     2,     1,     0,     2,     2,     2,     4,     2,     4,
+       4,     3,     1,     1,     1,     1,     1,     1,     1,     1,
+       1,     1,     1,     1,     1,     3,     2,     3,     2,     3,
+       2,     0,     2,     2,     2,     2,     2,     3,     4,     4,
+       4,     5,     2,     2,     1,     3,     0,     2,     2,     2,
        2,     2,     4,     3,     2,     4,     0,     2,     3,     1,
-       3,     2,     0,     2,     2,     2,     3,     2,     1,     3,
-       2,     0,     2,     2,     2,     3,     3,     1,     3,     2,
-       2,     2,     0,     2,     2,     4,     3,     3,     0,     2,
-       1,     1,     2,     2,     2,     1,     1,     0,     2,     1,
-       3,     3,     3,     2,     3,     3,     1,     1
+       3,     0,     2,     2,     2,     3,     2,     1,     3,     0,
+       2,     2,     2,     3,     3,     2,     2,     2,     0,     2,
+       2,     2,     4,     3,     3,     0,     2,     1,     1,     2,
+       2,     2,     1,     2,     0,     2,     1,     3,     3,     3,
+       2,     3,     3,     1,     1
 };
 
 /* YYDEFACT[STATE-NAME] -- Default rule to reduce with in state
@@ -500,136 +508,160 @@ static const unsigned char yyr2[] =
    means the default is an error.  */
 static const unsigned char yydefact[] =
 {
-       2,     0,     1,     0,     0,     0,     8,     0,     0,    10,
-       0,     0,     0,     0,     9,    85,    86,     3,     4,    22,
-      14,    22,    15,    37,    46,     5,    52,    12,    72,    61,
-       6,    67,    16,    72,    13,    17,    11,    80,    81,     0,
-       0,     0,    32,     0,     0,     0,    96,    97,     0,     0,
-       0,    89,    19,    21,    33,    36,    51,    57,     0,    69,
-       7,    56,    66,    68,    18,    20,     0,    93,    48,     0,
-       0,     0,     0,     0,     0,     0,     0,    78,     0,     0,
-       0,    26,    23,     0,    25,    24,     0,     0,    78,     0,
-      41,    38,    40,    39,     0,     0,     0,    47,    35,    34,
-      53,    55,    50,    54,    49,    74,    73,     0,    62,    64,
-      59,    63,    58,    92,    94,    95,    91,    90,    70,     0,
-       0,     0,    87,     0,    87,    87,    87,     0,    71,    44,
-      87,     0,    87,    82,    83,    84,    65,     0,    76,    77,
-       0,     0,    27,    79,     0,     0,    87,     0,    43,     0,
-      75,    88,    28,    29,    30,     0,    42,    45,    31
+       3,     0,     0,     1,     0,     0,     0,     0,     0,     0,
+       0,     0,     0,     0,     0,     0,    12,    16,    13,    14,
+      18,    15,    17,     0,    19,     0,     4,    31,    22,    31,
+      23,    46,    56,     5,    61,    20,    78,    69,     6,    24,
+      78,    21,     8,    11,    87,    88,     0,     0,    89,     0,
+      42,    90,     0,     0,     0,   103,   104,     0,     0,     0,
+      96,    91,     0,     0,     0,     0,     0,     0,     0,     0,
+       0,     0,    92,     7,    65,    73,    74,    27,    29,     0,
+     100,     0,     0,    58,     0,     0,     9,    10,     0,     0,
+       0,     0,     0,    85,     0,     0,     0,     0,    36,    35,
+      32,     0,    34,    33,     0,     0,    85,     0,    50,    51,
+      47,    49,    48,    57,    45,    44,    62,    64,    60,    63,
+      59,    80,    81,    79,    70,    72,    68,    71,    67,    93,
+      99,   101,   102,    98,    97,    26,    76,     0,     0,     0,
+      94,     0,    94,    94,    94,     0,     0,    77,    54,    94,
+       0,    94,     0,    83,    84,     0,     0,    37,    86,     0,
+       0,    94,    25,     0,    53,     0,    82,    95,    38,    39,
+      40,     0,    52,    55,    41
 };
 
 /* YYDEFGOTO[NTERM-NUM]. */
 static const short int yydefgoto[] =
 {
-      -1,     1,    17,    18,    19,    20,    21,    22,    52,    82,
-      23,    24,    98,    25,    54,    91,    55,    26,   102,    27,
-      56,    28,    29,   110,    30,    58,    31,    32,    33,    34,
-      83,    84,    57,    85,   123,   124,    99,    35,   141,    50,
-      51
+      -1,     1,     2,    25,    26,    99,    27,    28,    29,    30,
+      64,   100,    31,    32,   114,    33,    66,   110,    67,    34,
+     118,    35,    68,    36,    37,   126,    38,    70,    39,    40,
+      41,   101,   102,    69,   103,   141,   142,    42,    73,   156,
+      59,    60
 };
 
 /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
    STATE-NUM.  */
-#define YYPACT_NINF -113
+#define YYPACT_NINF -78
 static const short int yypact[] =
 {
-    -113,    37,  -113,   114,   136,   136,  -113,   136,   -29,  -113,
-     136,   -19,   -14,   -10,  -113,  -113,  -113,  -113,  -113,  -113,
-    -113,  -113,  -113,  -113,  -113,  -113,  -113,  -113,  -113,  -113,
-    -113,  -113,  -113,  -113,  -113,  -113,  -113,  -113,  -113,   114,
-       9,    25,  -113,    56,    60,    65,  -113,  -113,   -10,   -10,
-      33,    -1,   108,   108,    41,   103,    92,     5,    74,     5,
-    -113,  -113,  -113,  -113,  -113,  -113,   115,  -113,  -113,   -10,
-     -10,   138,   138,    80,   111,   -10,   136,   136,   -10,     2,
-     138,  -113,  -113,   113,  -113,  -113,    85,   136,   136,   107,
-    -113,  -113,  -113,  -113,   114,   114,   114,  -113,  -113,  -113,
-    -113,  -113,  -113,  -113,  -113,  -113,  -113,   120,  -113,  -113,
-    -113,  -113,  -113,  -113,   121,  -113,  -113,  -113,  -113,   -10,
-     109,   119,    16,   137,    16,    17,    16,   138,  -113,  -113,
-      16,   139,    16,  -113,  -113,  -113,  -113,   123,  -113,  -113,
-     -10,   140,  -113,  -113,   141,   142,    16,   143,  -113,   144,
-    -113,   133,  -113,  -113,  -113,   145,  -113,  -113,  -113
+     -78,     2,   159,   -78,   -21,     0,     0,   -12,     0,     1,
+       4,     0,    27,    38,    60,    58,   -78,   -78,   -78,   -78,
+     -78,   -78,   -78,   100,   -78,   104,   -78,   -78,   -78,   -78,
+     -78,   -78,   -78,   -78,   -78,   -78,   -78,   -78,   -78,   -78,
+     -78,   -78,   -78,   -78,   -78,   -78,    86,   113,   -78,   114,
+     -78,   -78,   125,   127,   128,   -78,   -78,    60,    60,   210,
+      65,   -78,   141,   142,    39,   103,   182,   200,     6,    66,
+       6,   131,   -78,   146,   -78,   -78,   -78,   -78,   -78,   196,
+     -78,    60,    60,   146,    40,    40,   -78,   -78,   155,   156,
+      -2,    60,     0,     0,    60,   105,    40,   194,   -78,   -78,
+     -78,   206,   -78,   -78,   183,     0,     0,   195,   -78,   -78,
+     -78,   -78,   -78,   -78,   -78,   -78,   -78,   -78,   -78,   -78,
+     -78,   -78,   -78,   -78,   -78,   -78,   -78,   -78,   -78,   -78,
+     -78,   197,   -78,   -78,   -78,   -78,   -78,    60,   213,   216,
+     212,   203,   212,   190,   212,    40,   208,   -78,   -78,   212,
+     222,   212,   219,   -78,   -78,    60,   223,   -78,   -78,   224,
+     225,   212,   -78,   226,   -78,   227,   -78,    47,   -78,   -78,
+     -78,   228,   -78,   -78,   -78
 };
 
 /* YYPGOTO[NTERM-NUM].  */
 static const short int yypgoto[] =
 {
-    -113,  -113,  -113,    14,  -113,  -113,  -113,  -113,   147,  -113,
-    -113,  -113,  -113,    -2,  -113,  -113,  -113,  -113,  -113,  -113,
-    -113,  -113,  -113,  -113,   101,  -113,  -113,  -113,  -113,  -113,
-    -113,   122,   146,    62,    89,     0,   102,    -3,  -112,   -46,
-     -63
+     -78,   -78,   -78,   -78,   164,   -36,   -78,   -78,   -78,   -78,
+     230,   -78,   -78,   -78,   -78,    29,   -78,   -78,   -78,   -78,
+     -78,   -78,   -78,   -78,   -78,   -78,    59,   -78,   -78,   -78,
+     -78,   -78,   198,   220,    24,   157,    -5,   169,   202,    74,
+     -53,   -77
 };
 
 /* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
    positive, shift that token.  If negative, reduce the rule which
    number is the opposite.  If zero, do what YYDEFACT says.
    If YYTABLE_NINF, syntax error.  */
-#define YYTABLE_NINF -61
+#define YYTABLE_NINF -76
 static const short int yytable[] =
 {
-      36,    42,    66,    67,    39,    40,    44,    41,   116,   117,
-      43,    45,   143,   144,   145,    46,    47,   127,   147,    48,
-     149,    74,    75,   114,   115,    49,    71,   126,   120,   121,
-     140,   140,   125,    72,   155,   105,    60,     2,     3,    61,
-       4,     5,     6,     7,     8,     9,    10,    11,    12,    69,
-      70,    13,    14,    73,   101,    62,   109,    74,    75,    86,
-      87,    88,    89,    68,   146,    69,    70,    15,    16,    97,
-     100,    90,   108,   137,   -60,   107,   122,   -60,     5,    94,
-       7,     8,    95,    10,    11,    12,    63,   130,    13,    96,
-      64,   133,   134,   135,   151,    65,     5,    94,     7,     8,
-      95,    10,    11,    12,    15,    16,    13,    96,    94,     7,
-     118,    95,    10,    11,    12,   129,    93,    13,    96,   106,
-      73,   106,    15,    16,    74,    75,   128,    76,    77,    78,
-      79,    80,   132,    15,    16,   119,    46,    47,    81,   138,
-      48,    69,    70,   113,    15,    16,    49,    69,    70,   139,
-     136,    69,    70,   150,    70,    69,    70,   103,   104,   111,
-     112,    37,    38,    46,    47,    69,    70,   142,    53,   148,
-     152,   153,   154,   156,   157,   158,    92,   131,     0,    59
+      46,    47,     3,    49,    79,    80,    52,   133,   134,    43,
+       6,     7,     8,     9,    10,    11,    12,    13,    48,   145,
+      14,    15,   137,    55,    56,    44,    45,    57,   131,   132,
+     109,    50,    58,   122,    51,   122,    24,   138,   139,   -28,
+      88,   143,   -28,   -28,   -28,   -28,   -28,   -28,   -28,   -28,
+     -28,    89,    53,   -28,   -28,    90,    91,   -28,    92,    93,
+      94,    95,    96,    54,    97,    55,    56,    88,   161,    98,
+     -66,   -66,   -66,   -66,   -66,   -66,   -66,   -66,    81,    82,
+     -66,   -66,    90,    91,   152,    55,    56,   140,    61,    57,
+     112,    97,    84,   123,    58,   123,   121,   117,    85,   125,
+     149,    62,   167,   -30,    88,    63,   -30,   -30,   -30,   -30,
+     -30,   -30,   -30,   -30,   -30,    89,    72,   -30,   -30,    90,
+      91,   -30,    92,    93,    94,    95,    96,   119,    97,   127,
+     144,   -75,    88,    98,   -75,   -75,   -75,   -75,   -75,   -75,
+     -75,   -75,   -75,    74,    75,   -75,   -75,    90,    91,   -75,
+     -75,   -75,   -75,   -75,   -75,    76,    97,    77,    78,    -2,
+       4,   121,     5,     6,     7,     8,     9,    10,    11,    12,
+      13,    86,    87,    14,    15,    16,   129,    17,    18,    19,
+      20,    21,    22,    88,    23,   135,   136,   -43,   -43,    24,
+     -43,   -43,   -43,   -43,    89,   146,   -43,   -43,    90,    91,
+     104,   105,   106,   107,   155,     7,     8,    97,    10,    11,
+      12,    13,   108,   148,    14,    15,   158,   159,   160,   147,
+     151,    81,    82,   163,   130,   165,   155,    81,    82,    82,
+      24,   113,   116,   157,   124,   171,   115,   120,   162,   128,
+      72,    81,    82,   153,    81,    82,   154,    81,    82,   166,
+      81,    82,   164,   168,   169,   170,   172,   173,   174,    65,
+      71,    83,     0,   150,   111
 };
 
 static const short int yycheck[] =
 {
-       3,    30,    48,    49,     4,     5,    25,     7,    71,    72,
-      10,    25,   124,   125,   126,    25,    26,    80,   130,    29,
-     132,    16,    17,    69,    70,    35,    27,    25,    74,    75,
-      14,    14,    78,    34,   146,    30,    39,     0,     1,    30,
-       3,     4,     5,     6,     7,     8,     9,    10,    11,    32,
-      33,    14,    15,    12,    56,    30,    58,    16,    17,    18,
-      19,    20,    21,    30,   127,    32,    33,    30,    31,    55,
-      56,    30,    58,   119,     0,     1,    76,     3,     4,     5,
-       6,     7,     8,     9,    10,    11,    30,    87,    14,    15,
-      30,    94,    95,    96,   140,    30,     4,     5,     6,     7,
-       8,     9,    10,    11,    30,    31,    14,    15,     5,     6,
-      30,     8,     9,    10,    11,    30,    54,    14,    15,    57,
-      12,    59,    30,    31,    16,    17,    13,    19,    20,    21,
-      22,    23,    25,    30,    31,    24,    25,    26,    30,    30,
-      29,    32,    33,    28,    30,    31,    35,    32,    33,    30,
-      30,    32,    33,    30,    33,    32,    33,    56,    56,    58,
-      58,    25,    26,    25,    26,    32,    33,    30,    21,    30,
-      30,    30,    30,    30,    30,    30,    54,    88,    -1,    33
+       5,     6,     0,     8,    57,    58,    11,    84,    85,    30,
+       4,     5,     6,     7,     8,     9,    10,    11,    30,    96,
+      14,    15,    24,    25,    26,    25,    26,    29,    81,    82,
+      66,    30,    34,    69,    30,    71,    30,    90,    91,     0,
+       1,    94,     3,     4,     5,     6,     7,     8,     9,    10,
+      11,    12,    25,    14,    15,    16,    17,    18,    19,    20,
+      21,    22,    23,    25,    25,    25,    26,     1,   145,    30,
+       4,     5,     6,     7,     8,     9,    10,    11,    31,    32,
+      14,    15,    16,    17,   137,    25,    26,    92,    30,    29,
+      66,    25,    27,    69,    34,    71,    30,    68,    33,    70,
+     105,     1,   155,     0,     1,     1,     3,     4,     5,     6,
+       7,     8,     9,    10,    11,    12,    30,    14,    15,    16,
+      17,    18,    19,    20,    21,    22,    23,    68,    25,    70,
+      25,     0,     1,    30,     3,     4,     5,     6,     7,     8,
+       9,    10,    11,    30,    30,    14,    15,    16,    17,    18,
+      19,    20,    21,    22,    23,    30,    25,    30,    30,     0,
+       1,    30,     3,     4,     5,     6,     7,     8,     9,    10,
+      11,    30,    30,    14,    15,    16,    30,    18,    19,    20,
+      21,    22,    23,     1,    25,    30,    30,     5,     6,    30,
+       8,     9,    10,    11,    12,     1,    14,    15,    16,    17,
+      18,    19,    20,    21,    14,     5,     6,    25,     8,     9,
+      10,    11,    30,    30,    14,    15,   142,   143,   144,    13,
+      25,    31,    32,   149,    28,   151,    14,    31,    32,    32,
+      30,    67,    68,    30,    70,   161,    67,    68,    30,    70,
+      30,    31,    32,    30,    31,    32,    30,    31,    32,    30,
+      31,    32,    30,    30,    30,    30,    30,    30,    30,    29,
+      40,    59,    -1,   106,    66
 };
 
 /* YYSTOS[STATE-NUM] -- The (internal number of the) accessing
    symbol of state STATE-NUM.  */
 static const unsigned char yystos[] =
 {
-       0,    37,     0,     1,     3,     4,     5,     6,     7,     8,
-       9,    10,    11,    14,    15,    30,    31,    38,    39,    40,
-      41,    42,    43,    46,    47,    49,    53,    55,    57,    58,
-      60,    62,    63,    64,    65,    73,    73,    25,    26,    71,
-      71,    71,    30,    71,    25,    25,    25,    26,    29,    35,
-      75,    76,    44,    44,    50,    52,    56,    68,    61,    68,
-      73,    30,    30,    30,    30,    30,    75,    75,    30,    32,
-      33,    27,    34,    12,    16,    17,    19,    20,    21,    22,
-      23,    30,    45,    66,    67,    69,    18,    19,    20,    21,
-      30,    51,    67,    69,     5,     8,    15,    39,    48,    72,
-      39,    49,    54,    60,    72,    30,    69,     1,    39,    49,
-      59,    60,    72,    28,    75,    75,    76,    76,    30,    24,
-      75,    75,    71,    70,    71,    75,    25,    76,    13,    30,
-      71,    70,    25,    73,    73,    73,    30,    75,    30,    30,
-      14,    74,    30,    74,    74,    74,    76,    74,    30,    74,
-      30,    75,    30,    30,    30,    74,    30,    30,    30
+       0,    36,    37,     0,     1,     3,     4,     5,     6,     7,
+       8,     9,    10,    11,    14,    15,    16,    18,    19,    20,
+      21,    22,    23,    25,    30,    38,    39,    41,    42,    43,
+      44,    47,    48,    50,    54,    56,    58,    59,    61,    63,
+      64,    65,    72,    30,    25,    26,    71,    71,    30,    71,
+      30,    30,    71,    25,    25,    25,    26,    29,    34,    75,
+      76,    30,     1,     1,    45,    45,    51,    53,    57,    68,
+      62,    68,    30,    73,    30,    30,    30,    30,    30,    75,
+      75,    31,    32,    73,    27,    33,    30,    30,     1,    12,
+      16,    17,    19,    20,    21,    22,    23,    25,    30,    40,
+      46,    66,    67,    69,    18,    19,    20,    21,    30,    40,
+      52,    67,    69,    39,    49,    72,    39,    50,    55,    61,
+      72,    30,    40,    69,    39,    50,    60,    61,    72,    30,
+      28,    75,    75,    76,    76,    30,    30,    24,    75,    75,
+      71,    70,    71,    75,    25,    76,     1,    13,    30,    71,
+      70,    25,    75,    30,    30,    14,    74,    30,    74,    74,
+      74,    76,    30,    74,    30,    74,    30,    75,    30,    30,
+      30,    74,    30,    30,    30
 };
 
 #if ! defined (YYSIZE_T) && defined (__SIZE_TYPE__)
@@ -966,6 +998,36 @@ yydestruct (yymsg, yytype, yyvaluep)
 
   switch (yytype)
     {
+      case 48: /* choice_entry */
+
+        {
+	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
+		(yyvaluep->menu)->file->name, (yyvaluep->menu)->lineno);
+	if (current_menu == (yyvaluep->menu))
+		menu_end_menu();
+};
+
+        break;
+      case 54: /* if_entry */
+
+        {
+	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
+		(yyvaluep->menu)->file->name, (yyvaluep->menu)->lineno);
+	if (current_menu == (yyvaluep->menu))
+		menu_end_menu();
+};
+
+        break;
+      case 59: /* menu_entry */
+
+        {
+	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
+		(yyvaluep->menu)->file->name, (yyvaluep->menu)->lineno);
+	if (current_menu == (yyvaluep->menu))
+		menu_end_menu();
+};
+
+        break;
 
       default:
         break;
@@ -1271,25 +1333,37 @@ yyreduce:
     {
         case 8:
 
-    { zconfprint("unexpected 'endmenu' statement"); ;}
+    { zconf_error("unexpected end statement"); ;}
     break;
 
   case 9:
 
-    { zconfprint("unexpected 'endif' statement"); ;}
+    { zconf_error("unknown statement \"%s\"", (yyvsp[-2].string)); ;}
     break;
 
   case 10:
 
-    { zconfprint("unexpected 'endchoice' statement"); ;}
+    {
+	zconf_error("unexpected option \"%s\"", kconf_id_strings + (yyvsp[-2].id)->name);
+;}
     break;
 
   case 11:
 
-    { zconfprint("syntax error"); yyerrok; ;}
+    { zconf_error("invalid statement"); ;}
     break;
 
-  case 18:
+  case 25:
+
+    { zconf_error("unknown option \"%s\"", (yyvsp[-2].string)); ;}
+    break;
+
+  case 26:
+
+    { zconf_error("invalid option"); ;}
+    break;
+
+  case 27:
 
     {
 	struct symbol *sym = sym_lookup((yyvsp[-1].string), 0);
@@ -1299,7 +1373,7 @@ yyreduce:
 ;}
     break;
 
-  case 19:
+  case 28:
 
     {
 	menu_end_entry();
@@ -1307,7 +1381,7 @@ yyreduce:
 ;}
     break;
 
-  case 20:
+  case 29:
 
     {
 	struct symbol *sym = sym_lookup((yyvsp[-1].string), 0);
@@ -1317,7 +1391,7 @@ yyreduce:
 ;}
     break;
 
-  case 21:
+  case 30:
 
     {
 	if (current_entry->prompt)
@@ -1329,7 +1403,7 @@ yyreduce:
 ;}
     break;
 
-  case 27:
+  case 37:
 
     {
 	menu_set_type((yyvsp[-2].id)->stype);
@@ -1339,7 +1413,7 @@ yyreduce:
 ;}
     break;
 
-  case 28:
+  case 38:
 
     {
 	menu_add_prompt(P_PROMPT, (yyvsp[-2].string), (yyvsp[-1].expr));
@@ -1347,7 +1421,7 @@ yyreduce:
 ;}
     break;
 
-  case 29:
+  case 39:
 
     {
 	menu_add_expr(P_DEFAULT, (yyvsp[-2].expr), (yyvsp[-1].expr));
@@ -1359,7 +1433,7 @@ yyreduce:
 ;}
     break;
 
-  case 30:
+  case 40:
 
     {
 	menu_add_symbol(P_SELECT, sym_lookup((yyvsp[-2].string), 0), (yyvsp[-1].expr));
@@ -1367,7 +1441,7 @@ yyreduce:
 ;}
     break;
 
-  case 31:
+  case 41:
 
     {
 	menu_add_expr(P_RANGE, expr_alloc_comp(E_RANGE,(yyvsp[-3].symbol), (yyvsp[-2].symbol)), (yyvsp[-1].expr));
@@ -1375,7 +1449,7 @@ yyreduce:
 ;}
     break;
 
-  case 32:
+  case 42:
 
     {
 	struct symbol *sym = sym_lookup(NULL, 0);
@@ -1386,33 +1460,24 @@ yyreduce:
 ;}
     break;
 
-  case 33:
+  case 43:
 
     {
-	menu_end_entry();
-	menu_add_menu();
+	(yyval.menu) = menu_add_menu();
 ;}
     break;
 
-  case 34:
+  case 44:
 
     {
-	if (zconf_endtoken((yyvsp[0].token), T_CHOICE, T_ENDCHOICE)) {
+	if (zconf_endtoken((yyvsp[0].id), T_CHOICE, T_ENDCHOICE)) {
 		menu_end_menu();
 		printd(DEBUG_PARSE, "%s:%d:endchoice\n", zconf_curname(), zconf_lineno());
 	}
 ;}
     break;
 
-  case 36:
-
-    {
-	printf("%s:%d: missing 'endchoice' for this 'choice' statement\n", current_menu->file->name, current_menu->lineno);
-	zconfnerrs++;
-;}
-    break;
-
-  case 42:
+  case 52:
 
     {
 	menu_add_prompt(P_PROMPT, (yyvsp[-2].string), (yyvsp[-1].expr));
@@ -1420,7 +1485,7 @@ yyreduce:
 ;}
     break;
 
-  case 43:
+  case 53:
 
     {
 	if ((yyvsp[-2].id)->stype == S_BOOLEAN || (yyvsp[-2].id)->stype == S_TRISTATE) {
@@ -1433,7 +1498,7 @@ yyreduce:
 ;}
     break;
 
-  case 44:
+  case 54:
 
     {
 	current_entry->sym->flags |= SYMBOL_OPTIONAL;
@@ -1441,7 +1506,7 @@ yyreduce:
 ;}
     break;
 
-  case 45:
+  case 55:
 
     {
 	if ((yyvsp[-3].id)->stype == S_UNKNOWN) {
@@ -1453,36 +1518,27 @@ yyreduce:
 ;}
     break;
 
-  case 48:
+  case 58:
 
     {
 	printd(DEBUG_PARSE, "%s:%d:if\n", zconf_curname(), zconf_lineno());
 	menu_add_entry(NULL);
 	menu_add_dep((yyvsp[-1].expr));
-	menu_end_entry();
-	menu_add_menu();
+	(yyval.menu) = menu_add_menu();
 ;}
     break;
 
-  case 49:
+  case 59:
 
     {
-	if (zconf_endtoken((yyvsp[0].token), T_IF, T_ENDIF)) {
+	if (zconf_endtoken((yyvsp[0].id), T_IF, T_ENDIF)) {
 		menu_end_menu();
 		printd(DEBUG_PARSE, "%s:%d:endif\n", zconf_curname(), zconf_lineno());
 	}
 ;}
     break;
 
-  case 51:
-
-    {
-	printf("%s:%d: missing 'endif' for this 'if' statement\n", current_menu->file->name, current_menu->lineno);
-	zconfnerrs++;
-;}
-    break;
-
-  case 56:
+  case 65:
 
     {
 	menu_add_entry(NULL);
@@ -1491,53 +1547,32 @@ yyreduce:
 ;}
     break;
 
-  case 57:
+  case 66:
 
     {
-	menu_end_entry();
-	menu_add_menu();
+	(yyval.menu) = menu_add_menu();
 ;}
     break;
 
-  case 58:
+  case 67:
 
     {
-	if (zconf_endtoken((yyvsp[0].token), T_MENU, T_ENDMENU)) {
+	if (zconf_endtoken((yyvsp[0].id), T_MENU, T_ENDMENU)) {
 		menu_end_menu();
 		printd(DEBUG_PARSE, "%s:%d:endmenu\n", zconf_curname(), zconf_lineno());
 	}
 ;}
     break;
 
-  case 60:
+  case 73:
 
     {
-	printf("%s:%d: missing 'endmenu' for this 'menu' statement\n", current_menu->file->name, current_menu->lineno);
-	zconfnerrs++;
-;}
-    break;
-
-  case 65:
-
-    { zconfprint("invalid menu option"); yyerrok; ;}
-    break;
-
-  case 66:
-
-    {
-	(yyval.string) = (yyvsp[-1].string);
 	printd(DEBUG_PARSE, "%s:%d:source %s\n", zconf_curname(), zconf_lineno(), (yyvsp[-1].string));
+	zconf_nextfile((yyvsp[-1].string));
 ;}
     break;
 
-  case 67:
-
-    {
-	zconf_nextfile((yyvsp[0].string));
-;}
-    break;
-
-  case 68:
+  case 74:
 
     {
 	menu_add_entry(NULL);
@@ -1546,14 +1581,14 @@ yyreduce:
 ;}
     break;
 
-  case 69:
+  case 75:
 
     {
 	menu_end_entry();
 ;}
     break;
 
-  case 70:
+  case 76:
 
     {
 	printd(DEBUG_PARSE, "%s:%d:help\n", zconf_curname(), zconf_lineno());
@@ -1561,14 +1596,14 @@ yyreduce:
 ;}
     break;
 
-  case 71:
+  case 77:
 
     {
 	current_entry->sym->help = (yyvsp[0].string);
 ;}
     break;
 
-  case 75:
+  case 82:
 
     {
 	menu_add_dep((yyvsp[-1].expr));
@@ -1576,7 +1611,7 @@ yyreduce:
 ;}
     break;
 
-  case 76:
+  case 83:
 
     {
 	menu_add_dep((yyvsp[-1].expr));
@@ -1584,7 +1619,7 @@ yyreduce:
 ;}
     break;
 
-  case 77:
+  case 84:
 
     {
 	menu_add_dep((yyvsp[-1].expr));
@@ -1592,79 +1627,79 @@ yyreduce:
 ;}
     break;
 
-  case 79:
+  case 86:
 
     {
 	menu_add_prompt(P_PROMPT, (yyvsp[-1].string), (yyvsp[0].expr));
 ;}
     break;
 
-  case 82:
+  case 89:
 
-    { (yyval.token) = T_ENDMENU; ;}
+    { (yyval.id) = (yyvsp[-1].id); ;}
     break;
 
-  case 83:
+  case 90:
 
-    { (yyval.token) = T_ENDCHOICE; ;}
+    { (yyval.id) = (yyvsp[-1].id); ;}
     break;
 
-  case 84:
+  case 91:
 
-    { (yyval.token) = T_ENDIF; ;}
+    { (yyval.id) = (yyvsp[-1].id); ;}
     break;
 
-  case 87:
+  case 94:
 
     { (yyval.expr) = NULL; ;}
     break;
 
-  case 88:
+  case 95:
 
     { (yyval.expr) = (yyvsp[0].expr); ;}
     break;
 
-  case 89:
+  case 96:
 
     { (yyval.expr) = expr_alloc_symbol((yyvsp[0].symbol)); ;}
     break;
 
-  case 90:
+  case 97:
 
     { (yyval.expr) = expr_alloc_comp(E_EQUAL, (yyvsp[-2].symbol), (yyvsp[0].symbol)); ;}
     break;
 
-  case 91:
+  case 98:
 
     { (yyval.expr) = expr_alloc_comp(E_UNEQUAL, (yyvsp[-2].symbol), (yyvsp[0].symbol)); ;}
     break;
 
-  case 92:
+  case 99:
 
     { (yyval.expr) = (yyvsp[-1].expr); ;}
     break;
 
-  case 93:
+  case 100:
 
     { (yyval.expr) = expr_alloc_one(E_NOT, (yyvsp[0].expr)); ;}
     break;
 
-  case 94:
+  case 101:
 
     { (yyval.expr) = expr_alloc_two(E_OR, (yyvsp[-2].expr), (yyvsp[0].expr)); ;}
     break;
 
-  case 95:
+  case 102:
 
     { (yyval.expr) = expr_alloc_two(E_AND, (yyvsp[-2].expr), (yyvsp[0].expr)); ;}
     break;
 
-  case 96:
+  case 103:
 
     { (yyval.symbol) = sym_lookup((yyvsp[0].string), 0); free((yyvsp[0].string)); ;}
     break;
 
-  case 97:
+  case 104:
 
     { (yyval.symbol) = sym_lookup((yyvsp[0].string), 1); free((yyvsp[0].string)); ;}
     break;
@@ -1916,7 +1951,10 @@ void conf_parse(const char *name)
 	modules_sym = sym_lookup("MODULES", 0);
 	rootmenu.prompt = menu_add_prompt(P_MENU, "Linux Kernel Configuration", NULL);
 
-	//zconfdebug = 1;
+#if YYDEBUG
+	if (getenv("ZCONF_DEBUG"))
+		zconfdebug = 1;
+#endif
 	zconfparse();
 	if (zconfnerrs)
 		exit(1);
@@ -1937,20 +1975,25 @@ const char *zconf_tokenname(int token)
 	case T_ENDCHOICE:	return "endchoice";
 	case T_IF:		return "if";
 	case T_ENDIF:		return "endif";
+	case T_DEPENDS:		return "depends";
 	}
 	return "<token>";
 }
 
-static bool zconf_endtoken(int token, int starttoken, int endtoken)
+static bool zconf_endtoken(struct kconf_id *id, int starttoken, int endtoken)
 {
-	if (token != endtoken) {
-		zconfprint("unexpected '%s' within %s block", zconf_tokenname(token), zconf_tokenname(starttoken));
+	if (id->token != endtoken) {
+		zconf_error("unexpected '%s' within %s block",
+			kconf_id_strings + id->name, zconf_tokenname(starttoken));
 		zconfnerrs++;
 		return false;
 	}
 	if (current_menu->file != current_file) {
-		zconfprint("'%s' in different file than '%s'", zconf_tokenname(token), zconf_tokenname(starttoken));
-		zconfprint("location of the '%s'", zconf_tokenname(starttoken));
+		zconf_error("'%s' in different file than '%s'",
+			kconf_id_strings + id->name, zconf_tokenname(starttoken));
+		fprintf(stderr, "%s:%d: location of the '%s'\n",
+			current_menu->file->name, current_menu->lineno,
+			zconf_tokenname(starttoken));
 		zconfnerrs++;
 		return false;
 	}
@@ -1961,7 +2004,19 @@ static void zconfprint(const char *err, ...)
 {
 	va_list ap;
 
-	fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno() + 1);
+	fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
+	va_start(ap, err);
+	vfprintf(stderr, err, ap);
+	va_end(ap);
+	fprintf(stderr, "\n");
+}
+
+static void zconf_error(const char *err, ...)
+{
+	va_list ap;
+
+	zconfnerrs++;
+	fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
 	va_start(ap, err);
 	vfprintf(stderr, err, ap);
 	va_end(ap);
@@ -1970,7 +2025,9 @@ static void zconfprint(const char *err, ...)
 
 static void zconferror(const char *err)
 {
+#if YYDEBUG
 	fprintf(stderr, "%s:%d: %s\n", zconf_curname(), zconf_lineno() + 1, err);
+#endif
 }
 
 void print_quoted_string(FILE *out, const char *str)
diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/zconf.y
index 1211781..1f61fba 100644
--- a/scripts/kconfig/zconf.y
+++ b/scripts/kconfig/zconf.y
@@ -25,21 +25,25 @@ int cdebug = PRINTD;
 
 extern int zconflex(void);
 static void zconfprint(const char *err, ...);
+static void zconf_error(const char *err, ...);
 static void zconferror(const char *err);
-static bool zconf_endtoken(int token, int starttoken, int endtoken);
+static bool zconf_endtoken(struct kconf_id *id, int starttoken, int endtoken);
 
 struct symbol *symbol_hash[257];
 
 static struct menu *current_menu, *current_entry;
 
+#define YYDEBUG 0
+#if YYDEBUG
 #define YYERROR_VERBOSE
+#endif
 %}
-%expect 40
+%expect 26
 
 %union
 {
-	int token;
 	char *string;
+	struct file *file;
 	struct symbol *symbol;
 	struct expr *expr;
 	struct menu *menu;
@@ -74,7 +78,6 @@ static struct menu *current_menu, *current_entry;
 %token T_CLOSE_PAREN
 %token T_OPEN_PAREN
 %token T_EOL
-%token T_EOF
 
 %left T_OR
 %left T_AND
@@ -82,34 +85,54 @@ static struct menu *current_menu, *current_entry;
 %nonassoc T_NOT
 
 %type <string> prompt
-%type <string> source
 %type <symbol> symbol
 %type <expr> expr
 %type <expr> if_expr
-%type <token> end
+%type <id> end
+%type <id> option_name
+%type <menu> if_entry menu_entry choice_entry
+
+%destructor {
+	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
+		$$->file->name, $$->lineno);
+	if (current_menu == $$)
+		menu_end_menu();
+} if_entry menu_entry choice_entry
 
 %%
-input:	  /* empty */
-	| input block
+input: stmt_list;
+
+stmt_list:
+	  /* empty */
+	| stmt_list common_stmt
+	| stmt_list choice_stmt
+	| stmt_list menu_stmt
+	| stmt_list T_MAINMENU prompt nl
+	| stmt_list end			{ zconf_error("unexpected end statement"); }
+	| stmt_list T_WORD error T_EOL	{ zconf_error("unknown statement \"%s\"", $2); }
+	| stmt_list option_name error T_EOL
+{
+	zconf_error("unexpected option \"%s\"", kconf_id_strings + $2->name);
+}
+	| stmt_list error T_EOL		{ zconf_error("invalid statement"); }
 ;
 
-block:	  common_block
-	| choice_stmt
-	| menu_stmt
-	| T_MAINMENU prompt nl_or_eof
-	| T_ENDMENU		{ zconfprint("unexpected 'endmenu' statement"); }
-	| T_ENDIF		{ zconfprint("unexpected 'endif' statement"); }
-	| T_ENDCHOICE		{ zconfprint("unexpected 'endchoice' statement"); }
-	| error nl_or_eof	{ zconfprint("syntax error"); yyerrok; }
+option_name:
+	T_DEPENDS | T_PROMPT | T_TYPE | T_SELECT | T_OPTIONAL | T_RANGE | T_DEFAULT
 ;
 
-common_block:
-	  if_stmt
+common_stmt:
+	  T_EOL
+	| if_stmt
 	| comment_stmt
 	| config_stmt
 	| menuconfig_stmt
 	| source_stmt
-	| nl_or_eof
+;
+
+option_error:
+	  T_WORD error T_EOL		{ zconf_error("unknown option \"%s\"", $1); }
+	| error T_EOL			{ zconf_error("invalid option"); }
 ;
 
 
@@ -152,6 +175,7 @@ config_option_list:
 	| config_option_list config_option
 	| config_option_list depends
 	| config_option_list help
+	| config_option_list option_error
 	| config_option_list T_EOL
 ;
 
@@ -204,8 +228,7 @@ choice: T_CHOICE T_EOL
 
 choice_entry: choice choice_option_list
 {
-	menu_end_entry();
-	menu_add_menu();
+	$$ = menu_add_menu();
 };
 
 choice_end: end
@@ -216,13 +239,8 @@ choice_end: end
 	}
 };
 
-choice_stmt:
-	  choice_entry choice_block choice_end
-	| choice_entry choice_block
-{
-	printf("%s:%d: missing 'endchoice' for this 'choice' statement\n", current_menu->file->name, current_menu->lineno);
-	zconfnerrs++;
-};
+choice_stmt: choice_entry choice_block choice_end
+;
 
 choice_option_list:
 	  /* empty */
@@ -230,6 +248,7 @@ choice_option_list:
 	| choice_option_list depends
 	| choice_option_list help
 	| choice_option_list T_EOL
+	| choice_option_list option_error
 ;
 
 choice_option: T_PROMPT prompt if_expr T_EOL
@@ -267,18 +286,17 @@ choice_option: T_DEFAULT T_WORD if_expr T_EOL
 
 choice_block:
 	  /* empty */
-	| choice_block common_block
+	| choice_block common_stmt
 ;
 
 /* if entry */
 
-if: T_IF expr T_EOL
+if_entry: T_IF expr nl
 {
 	printd(DEBUG_PARSE, "%s:%d:if\n", zconf_curname(), zconf_lineno());
 	menu_add_entry(NULL);
 	menu_add_dep($2);
-	menu_end_entry();
-	menu_add_menu();
+	$$ = menu_add_menu();
 };
 
 if_end: end
@@ -289,17 +307,12 @@ if_end: end
 	}
 };
 
-if_stmt:
-	  if if_block if_end
-	| if if_block
-{
-	printf("%s:%d: missing 'endif' for this 'if' statement\n", current_menu->file->name, current_menu->lineno);
-	zconfnerrs++;
-};
+if_stmt: if_entry if_block if_end
+;
 
 if_block:
 	  /* empty */
-	| if_block common_block
+	| if_block common_stmt
 	| if_block menu_stmt
 	| if_block choice_stmt
 ;
@@ -315,8 +328,7 @@ menu: T_MENU prompt T_EOL
 
 menu_entry: menu depends_list
 {
-	menu_end_entry();
-	menu_add_menu();
+	$$ = menu_add_menu();
 };
 
 menu_end: end
@@ -327,31 +339,20 @@ menu_end: end
 	}
 };
 
-menu_stmt:
-	  menu_entry menu_block menu_end
-	| menu_entry menu_block
-{
-	printf("%s:%d: missing 'endmenu' for this 'menu' statement\n", current_menu->file->name, current_menu->lineno);
-	zconfnerrs++;
-};
+menu_stmt: menu_entry menu_block menu_end
+;
 
 menu_block:
 	  /* empty */
-	| menu_block common_block
+	| menu_block common_stmt
 	| menu_block menu_stmt
 	| menu_block choice_stmt
-	| menu_block error T_EOL		{ zconfprint("invalid menu option"); yyerrok; }
 ;
 
-source: T_SOURCE prompt T_EOL
+source_stmt: T_SOURCE prompt T_EOL
 {
-	$$ = $2;
 	printd(DEBUG_PARSE, "%s:%d:source %s\n", zconf_curname(), zconf_lineno(), $2);
-};
-
-source_stmt: source
-{
-	zconf_nextfile($1);
+	zconf_nextfile($2);
 };
 
 /* comment entry */
@@ -383,9 +384,11 @@ help: help_start T_HELPTEXT
 
 /* depends option */
 
-depends_list:	  /* empty */
-		| depends_list depends
-		| depends_list T_EOL
+depends_list:
+	  /* empty */
+	| depends_list depends
+	| depends_list T_EOL
+	| depends_list option_error
 ;
 
 depends: T_DEPENDS T_ON expr T_EOL
@@ -417,13 +420,15 @@ prompt:	  T_WORD
 	| T_WORD_QUOTE
 ;
 
-end:	  T_ENDMENU nl_or_eof	{ $$ = T_ENDMENU; }
-	| T_ENDCHOICE nl_or_eof	{ $$ = T_ENDCHOICE; }
-	| T_ENDIF nl_or_eof	{ $$ = T_ENDIF; }
+end:	  T_ENDMENU T_EOL	{ $$ = $1; }
+	| T_ENDCHOICE T_EOL	{ $$ = $1; }
+	| T_ENDIF T_EOL		{ $$ = $1; }
 ;
 
-nl_or_eof:
-	T_EOL | T_EOF;
+nl:
+	  T_EOL
+	| nl T_EOL
+;
 
 if_expr:  /* empty */			{ $$ = NULL; }
 	| T_IF expr			{ $$ = $2; }
@@ -456,7 +461,10 @@ void conf_parse(const char *name)
 	modules_sym = sym_lookup("MODULES", 0);
 	rootmenu.prompt = menu_add_prompt(P_MENU, "Linux Kernel Configuration", NULL);
 
-	//zconfdebug = 1;
+#if YYDEBUG
+	if (getenv("ZCONF_DEBUG"))
+		zconfdebug = 1;
+#endif
 	zconfparse();
 	if (zconfnerrs)
 		exit(1);
@@ -477,20 +485,25 @@ const char *zconf_tokenname(int token)
 	case T_ENDCHOICE:	return "endchoice";
 	case T_IF:		return "if";
 	case T_ENDIF:		return "endif";
+	case T_DEPENDS:		return "depends";
 	}
 	return "<token>";
 }
 
-static bool zconf_endtoken(int token, int starttoken, int endtoken)
+static bool zconf_endtoken(struct kconf_id *id, int starttoken, int endtoken)
 {
-	if (token != endtoken) {
-		zconfprint("unexpected '%s' within %s block", zconf_tokenname(token), zconf_tokenname(starttoken));
+	if (id->token != endtoken) {
+		zconf_error("unexpected '%s' within %s block",
+			kconf_id_strings + id->name, zconf_tokenname(starttoken));
 		zconfnerrs++;
 		return false;
 	}
 	if (current_menu->file != current_file) {
-		zconfprint("'%s' in different file than '%s'", zconf_tokenname(token), zconf_tokenname(starttoken));
-		zconfprint("location of the '%s'", zconf_tokenname(starttoken));
+		zconf_error("'%s' in different file than '%s'",
+			kconf_id_strings + id->name, zconf_tokenname(starttoken));
+		fprintf(stderr, "%s:%d: location of the '%s'\n",
+			current_menu->file->name, current_menu->lineno,
+			zconf_tokenname(starttoken));
 		zconfnerrs++;
 		return false;
 	}
@@ -501,7 +514,19 @@ static void zconfprint(const char *err, ...)
 {
 	va_list ap;
 
-	fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno() + 1);
+	fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
+	va_start(ap, err);
+	vfprintf(stderr, err, ap);
+	va_end(ap);
+	fprintf(stderr, "\n");
+}
+
+static void zconf_error(const char *err, ...)
+{
+	va_list ap;
+
+	zconfnerrs++;
+	fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
 	va_start(ap, err);
 	vfprintf(stderr, err, ap);
 	va_end(ap);
@@ -510,7 +535,9 @@ static void zconfprint(const char *err, ...)
 
 static void zconferror(const char *err)
 {
+#if YYDEBUG
 	fprintf(stderr, "%s:%d: %s\n", zconf_curname(), zconf_lineno() + 1, err);
+#endif
 }
 
 void print_quoted_string(FILE *out, const char *str)