Yet another major rework of the BusyBox config system, using the considerably

modified Kbuild system I put into uClibc.  With this, there should be no more
need to modify Rules.mak since I've moved all the interesting options into the
config system.  I think I've got everything updated, but you never know, I may
have made some mistakes, so watch closely.
 -Erik

1 files changed, 651 insertions, 0 deletions

diff --git a/scripts/config/zconf.y b/scripts/config/zconf.y
new file mode 100644
index 0000000..301d7a8
--- /dev/null
+++ b/scripts/config/zconf.y
@@ -0,0 +1,651 @@
+%{
+/*
+ * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
+ * Released under the terms of the GNU GPL v2.0.
+ */
+
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+
+#define printd(mask, fmt...) if (cdebug & (mask)) printf(fmt)
+
+#define PRINTD		0x0001
+#define DEBUG_PARSE	0x0002
+
+int cdebug = PRINTD;
+
+extern int zconflex(void);
+static void zconfprint(const char *err, ...);
+static void zconferror(const char *err);
+static bool zconf_endtoken(int token, int starttoken, int endtoken);
+
+struct symbol *symbol_hash[257];
+
+#define YYERROR_VERBOSE
+%}
+%expect 36
+
+%union
+{
+	int token;
+	char *string;
+	struct symbol *symbol;
+	struct expr *expr;
+	struct menu *menu;
+}
+
+%token T_MAINMENU
+%token T_MENU
+%token T_ENDMENU
+%token T_SOURCE
+%token T_CHOICE
+%token T_ENDCHOICE
+%token T_COMMENT
+%token T_CONFIG
+%token T_HELP
+%token <string> T_HELPTEXT
+%token T_IF
+%token T_ENDIF
+%token T_DEPENDS
+%token T_REQUIRES
+%token T_OPTIONAL
+%token T_PROMPT
+%token T_DEFAULT
+%token T_TRISTATE
+%token T_BOOLEAN
+%token T_INT
+%token T_HEX
+%token <string> T_WORD
+%token <string> T_STRING
+%token T_UNEQUAL
+%token T_EOF
+%token T_EOL
+%token T_CLOSE_PAREN
+%token T_OPEN_PAREN
+%token T_ON
+
+%left T_OR
+%left T_AND
+%left T_EQUAL T_UNEQUAL
+%nonassoc T_NOT
+
+%type <string> prompt
+%type <string> source
+%type <symbol> symbol
+%type <expr> expr
+%type <expr> if_expr
+%type <token> end
+
+%{
+#define LKC_DIRECT_LINK
+#include "lkc.h"
+%}
+%%
+input:	  /* empty */
+	| input block
+;
+
+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; }
+;
+
+common_block:
+	  if_stmt
+	| comment_stmt
+	| config_stmt
+	| source_stmt
+	| nl_or_eof
+;
+
+
+/* config entry */
+
+config_entry_start: T_CONFIG T_WORD
+{
+	struct symbol *sym = sym_lookup($2, 0);
+	sym->flags |= SYMBOL_OPTIONAL;
+	menu_add_entry(sym);
+	printd(DEBUG_PARSE, "%s:%d:config %s\n", zconf_curname(), zconf_lineno(), $2);
+};
+
+config_stmt: config_entry_start T_EOL config_option_list
+{
+	menu_end_entry();
+	printd(DEBUG_PARSE, "%s:%d:endconfig\n", zconf_curname(), zconf_lineno());
+};
+
+config_option_list:
+	  /* empty */
+	| config_option_list config_option T_EOL
+	| config_option_list depends T_EOL
+	| config_option_list help
+	| config_option_list T_EOL
+{ };
+
+config_option: T_TRISTATE prompt_stmt_opt
+{
+	menu_set_type(S_TRISTATE);
+	printd(DEBUG_PARSE, "%s:%d:tristate\n", zconf_curname(), zconf_lineno());
+};
+
+config_option: T_BOOLEAN prompt_stmt_opt
+{
+	menu_set_type(S_BOOLEAN);
+	printd(DEBUG_PARSE, "%s:%d:boolean\n", zconf_curname(), zconf_lineno());
+};
+
+config_option: T_INT prompt_stmt_opt
+{
+	menu_set_type(S_INT);
+	printd(DEBUG_PARSE, "%s:%d:int\n", zconf_curname(), zconf_lineno());
+};
+
+config_option: T_HEX prompt_stmt_opt
+{
+	menu_set_type(S_HEX);
+	printd(DEBUG_PARSE, "%s:%d:hex\n", zconf_curname(), zconf_lineno());
+};
+
+config_option: T_STRING prompt_stmt_opt
+{
+	menu_set_type(S_STRING);
+	printd(DEBUG_PARSE, "%s:%d:string\n", zconf_curname(), zconf_lineno());
+};
+
+config_option: T_PROMPT prompt if_expr
+{
+	menu_add_prop(P_PROMPT, $2, NULL, $3);
+	printd(DEBUG_PARSE, "%s:%d:prompt\n", zconf_curname(), zconf_lineno());
+};
+
+config_option: T_DEFAULT symbol if_expr
+{
+	menu_add_prop(P_DEFAULT, NULL, $2, $3);
+	printd(DEBUG_PARSE, "%s:%d:default\n", zconf_curname(), zconf_lineno());
+};
+
+/* choice entry */
+
+choice: T_CHOICE
+{
+	struct symbol *sym = sym_lookup(NULL, 0);
+	sym->flags |= SYMBOL_CHOICE;
+	menu_add_entry(sym);
+	menu_add_prop(P_CHOICE, NULL, NULL, NULL);
+	printd(DEBUG_PARSE, "%s:%d:choice\n", zconf_curname(), zconf_lineno());
+};
+
+choice_entry: choice T_EOL choice_option_list
+{
+	menu_end_entry();
+	menu_add_menu();
+};
+
+choice_end: end
+{
+	if (zconf_endtoken($1, T_CHOICE, T_ENDCHOICE)) {
+		menu_end_menu();
+		printd(DEBUG_PARSE, "%s:%d:endchoice\n", zconf_curname(), zconf_lineno());
+	}
+};
+
+choice_stmt:
+	  choice_entry choice_block choice_end T_EOL
+	| choice_entry choice_block
+{
+	printf("%s:%d: missing 'endchoice' for this 'choice' statement\n", current_menu->file->name, current_menu->lineno);
+	zconfnerrs++;
+};
+
+choice_option_list:
+	  /* empty */
+	| choice_option_list choice_option T_EOL
+	| choice_option_list depends T_EOL
+	| choice_option_list help
+	| choice_option_list T_EOL
+;
+
+choice_option: T_PROMPT prompt if_expr
+{
+	menu_add_prop(P_PROMPT, $2, NULL, $3);
+	printd(DEBUG_PARSE, "%s:%d:prompt\n", zconf_curname(), zconf_lineno());
+};
+
+choice_option: T_OPTIONAL
+{
+	current_entry->sym->flags |= SYMBOL_OPTIONAL;
+	printd(DEBUG_PARSE, "%s:%d:optional\n", zconf_curname(), zconf_lineno());
+};
+
+choice_option: T_DEFAULT symbol
+{
+	menu_add_prop(P_DEFAULT, NULL, $2, NULL);
+	//current_choice->prop->def = $2;
+	printd(DEBUG_PARSE, "%s:%d:default\n", zconf_curname(), zconf_lineno());
+};
+
+choice_block:
+	  /* empty */
+	| choice_block common_block
+;
+
+/* if entry */
+
+if: T_IF expr
+{
+	printd(DEBUG_PARSE, "%s:%d:if\n", zconf_curname(), zconf_lineno());
+	menu_add_entry(NULL);
+	//current_entry->prompt = menu_add_prop(T_IF, NULL, NULL, $2);
+	menu_add_dep($2);
+	menu_end_entry();
+	menu_add_menu();
+};
+
+if_end: end
+{
+	if (zconf_endtoken($1, T_IF, T_ENDIF)) {
+		menu_end_menu();
+		printd(DEBUG_PARSE, "%s:%d:endif\n", zconf_curname(), zconf_lineno());
+	}
+};
+
+if_stmt:
+	  if T_EOL if_block if_end T_EOL
+	| if T_EOL if_block
+{
+	printf("%s:%d: missing 'endif' for this 'if' statement\n", current_menu->file->name, current_menu->lineno);
+	zconfnerrs++;
+};
+
+if_block:
+	  /* empty */
+	| if_block common_block
+	| if_block menu_stmt
+	| if_block choice_stmt
+;
+
+/* menu entry */
+
+menu: T_MENU prompt
+{
+	menu_add_entry(NULL);
+	menu_add_prop(P_MENU, $2, NULL, NULL);
+	printd(DEBUG_PARSE, "%s:%d:menu\n", zconf_curname(), zconf_lineno());
+};
+
+menu_entry: menu T_EOL depends_list
+{
+	menu_end_entry();
+	menu_add_menu();
+};
+
+menu_end: end
+{
+	if (zconf_endtoken($1, T_MENU, T_ENDMENU)) {
+		menu_end_menu();
+		printd(DEBUG_PARSE, "%s:%d:endmenu\n", zconf_curname(), zconf_lineno());
+	}
+};
+
+menu_stmt:
+	  menu_entry menu_block menu_end T_EOL
+	| menu_entry menu_block
+{
+	printf("%s:%d: missing 'endmenu' for this 'menu' statement\n", current_menu->file->name, current_menu->lineno);
+	zconfnerrs++;
+};
+
+menu_block:
+	  /* empty */
+	| menu_block common_block
+	| menu_block menu_stmt
+	| menu_block choice_stmt
+	| menu_block error T_EOL		{ zconfprint("invalid menu option"); yyerrok; }
+;
+
+source: T_SOURCE prompt
+{
+	$$ = $2;
+	printd(DEBUG_PARSE, "%s:%d:source %s\n", zconf_curname(), zconf_lineno(), $2);
+};
+
+source_stmt: source T_EOL
+{
+	zconf_nextfile($1);
+};
+
+/* comment entry */
+
+comment: T_COMMENT prompt
+{
+	menu_add_entry(NULL);
+	menu_add_prop(P_COMMENT, $2, NULL, NULL);
+	printd(DEBUG_PARSE, "%s:%d:comment\n", zconf_curname(), zconf_lineno());
+};
+
+comment_stmt: comment T_EOL depends_list
+{
+	menu_end_entry();
+};
+
+/* help option */
+
+help_start: T_HELP T_EOL
+{
+	printd(DEBUG_PARSE, "%s:%d:help\n", zconf_curname(), zconf_lineno());
+	zconf_starthelp();
+};
+
+help: help_start T_HELPTEXT
+{
+	current_entry->sym->help = $2;
+};
+
+/* depends option */
+
+depends_list:	  /* empty */
+		| depends_list depends T_EOL
+		| depends_list T_EOL
+{ };
+
+depends: T_DEPENDS T_ON expr
+{
+	menu_add_dep($3);
+	printd(DEBUG_PARSE, "%s:%d:depends on\n", zconf_curname(), zconf_lineno());
+}
+	| T_DEPENDS expr
+{
+	menu_add_dep($2);
+	printd(DEBUG_PARSE, "%s:%d:depends\n", zconf_curname(), zconf_lineno());
+}
+	| T_REQUIRES expr
+{
+	menu_add_dep($2);
+	printd(DEBUG_PARSE, "%s:%d:requires\n", zconf_curname(), zconf_lineno());
+};
+
+/* prompt statement */
+
+prompt_stmt_opt:
+	  /* empty */
+	| prompt
+{
+	menu_add_prop(P_PROMPT, $1, NULL, NULL);
+}
+	| prompt T_IF expr
+{
+	menu_add_prop(P_PROMPT, $1, NULL, $3);
+};
+
+prompt:	  T_WORD
+	| T_STRING
+;
+
+end:	  T_ENDMENU		{ $$ = T_ENDMENU; }
+	| T_ENDCHOICE		{ $$ = T_ENDCHOICE; }
+	| T_ENDIF		{ $$ = T_ENDIF; }
+;
+
+nl_or_eof:
+	T_EOL | T_EOF;
+
+if_expr:  /* empty */			{ $$ = NULL; }
+	| T_IF expr			{ $$ = $2; }
+;
+
+expr:	  symbol				{ $$ = expr_alloc_symbol($1); }
+	| symbol T_EQUAL symbol			{ $$ = expr_alloc_comp(E_EQUAL, $1, $3); }
+	| symbol T_UNEQUAL symbol		{ $$ = expr_alloc_comp(E_UNEQUAL, $1, $3); }
+	| T_OPEN_PAREN expr T_CLOSE_PAREN	{ $$ = $2; }
+	| T_NOT expr				{ $$ = expr_alloc_one(E_NOT, $2); }
+	| expr T_OR expr			{ $$ = expr_alloc_two(E_OR, $1, $3); }
+	| expr T_AND expr			{ $$ = expr_alloc_two(E_AND, $1, $3); }
+;
+
+symbol:	  T_WORD	{ $$ = sym_lookup($1, 0); free($1); }
+	| T_STRING	{ $$ = sym_lookup($1, 1); free($1); }
+;
+
+%%
+
+void conf_parse(const char *name)
+{
+	zconf_initscan(name);
+
+	sym_init();
+	menu_init();
+	rootmenu.prompt = menu_add_prop(P_MENU, "BusyBox Configuration", NULL, NULL);
+
+	//zconfdebug = 1;
+	zconfparse();
+	if (zconfnerrs)
+		exit(1);
+	menu_finalize(&rootmenu);
+
+	modules_sym = sym_lookup("MODULES", 0);
+
+	sym_change_count = 1;
+}
+
+const char *zconf_tokenname(int token)
+{
+	switch (token) {
+	case T_MENU:		return "menu";
+	case T_ENDMENU:		return "endmenu";
+	case T_CHOICE:		return "choice";
+	case T_ENDCHOICE:	return "endchoice";
+	case T_IF:		return "if";
+	case T_ENDIF:		return "endif";
+	}
+	return "<token>";
+} 
+
+static bool zconf_endtoken(int token, int starttoken, int endtoken)
+{
+	if (token != endtoken) {
+		zconfprint("unexpected '%s' within %s block", zconf_tokenname(token), 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));
+		zconfnerrs++;
+		return false;
+	}
+	return true;
+}
+
+static void zconfprint(const char *err, ...)
+{
+	va_list ap;
+
+	fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
+	va_start(ap, err);
+	vfprintf(stderr, err, ap);
+	va_end(ap);
+	fprintf(stderr, "\n");
+}
+
+static void zconferror(const char *err)
+{
+	fprintf(stderr, "%s:%d: %s\n", zconf_curname(), zconf_lineno(), err);
+}
+
+void print_quoted_string(FILE *out, const char *str)
+{
+	const char *p;
+	int len;
+
+	putc('"', out);
+	while ((p = strchr(str, '"'))) {
+		len = p - str;
+		if (len)
+			fprintf(out, "%.*s", len, str);
+		fputs("\\\"", out);
+		str = p + 1;
+	}
+	fputs(str, out);
+	putc('"', out);
+}
+
+void print_symbol(FILE *out, struct menu *menu)
+{
+	struct symbol *sym = menu->sym;
+	struct property *prop;
+
+	//sym->flags |= SYMBOL_PRINTED;
+
+	if (sym_is_choice(sym))
+		fprintf(out, "choice\n");
+	else
+		fprintf(out, "config %s\n", sym->name);
+	switch (sym->type) {
+	case S_BOOLEAN:
+		fputs("  boolean\n", out);
+		break;
+	case S_TRISTATE:
+		fputs("  tristate\n", out);
+		break;
+	case S_STRING:
+		fputs("  string\n", out);
+		break;
+	case S_INT:
+		fputs("  integer\n", out);
+		break;
+	case S_HEX:
+		fputs("  hex\n", out);
+		break;
+	default:
+		fputs("  ???\n", out);
+		break;
+	}
+#if 0
+	if (!expr_is_yes(sym->dep)) {
+		fputs("  depends ", out);
+		expr_fprint(sym->dep, out);
+		fputc('\n', out);
+	}
+#endif
+	for (prop = sym->prop; prop; prop = prop->next) {
+		if (prop->menu != menu)
+			continue;
+		switch (prop->type) {
+		case P_PROMPT:
+			fputs("  prompt ", out);
+			print_quoted_string(out, prop->text);
+			if (prop->def) {
+				fputc(' ', out);
+				if (prop->def->flags & SYMBOL_CONST)
+					print_quoted_string(out, prop->def->name);
+				else
+					fputs(prop->def->name, out);
+			}
+			if (!expr_is_yes(E_EXPR(prop->visible))) {
+				fputs(" if ", out);
+				expr_fprint(E_EXPR(prop->visible), out);
+			}
+			fputc('\n', out);
+			break;
+		case P_DEFAULT:
+			fputs( "  default ", out);
+			print_quoted_string(out, prop->def->name);
+			if (!expr_is_yes(E_EXPR(prop->visible))) {
+				fputs(" if ", out);
+				expr_fprint(E_EXPR(prop->visible), out);
+			}
+			fputc('\n', out);
+			break;
+		case P_CHOICE:
+			fputs("  #choice value\n", out);
+			break;
+		default:
+			fprintf(out, "  unknown prop %d!\n", prop->type);
+			break;
+		}
+	}
+	if (sym->help) {
+		int len = strlen(sym->help);
+		while (sym->help[--len] == '\n')
+			sym->help[len] = 0;
+		fprintf(out, "  help\n%s\n", sym->help);
+	}
+	fputc('\n', out);
+}
+
+void zconfdump(FILE *out)
+{
+	//struct file *file;
+	struct property *prop;
+	struct symbol *sym;
+	struct menu *menu;
+
+	menu = rootmenu.list;
+	while (menu) {
+		if ((sym = menu->sym))
+			print_symbol(out, menu);
+		else if ((prop = menu->prompt)) {
+			switch (prop->type) {
+			//case T_MAINMENU:
+			//	fputs("\nmainmenu ", out);
+			//	print_quoted_string(out, prop->text);
+			//	fputs("\n", out);
+			//	break;
+			case P_COMMENT:
+				fputs("\ncomment ", out);
+				print_quoted_string(out, prop->text);
+				fputs("\n", out);
+				break;
+			case P_MENU:
+				fputs("\nmenu ", out);
+				print_quoted_string(out, prop->text);
+				fputs("\n", out);
+				break;
+			//case T_SOURCE:
+			//	fputs("\nsource ", out);
+			//	print_quoted_string(out, prop->text);
+			//	fputs("\n", out);
+			//	break;
+			//case T_IF:
+			//	fputs("\nif\n", out);
+			default:
+				;
+			}
+			if (!expr_is_yes(E_EXPR(prop->visible))) {
+				fputs("  depends ", out);
+				expr_fprint(E_EXPR(prop->visible), out);
+				fputc('\n', out);
+			}
+			fputs("\n", out);
+		}
+
+		if (menu->list)
+			menu = menu->list;
+		else if (menu->next)
+			menu = menu->next;
+		else while ((menu = menu->parent)) {
+			if (menu->prompt && menu->prompt->type == P_MENU)
+				fputs("\nendmenu\n", out);
+			if (menu->next) {
+				menu = menu->next;
+				break;
+			}
+		}
+	}
+}
+
+#include "lex.zconf.c"
+#include "confdata.c"
+#include "expr.c"
+#include "symbol.c"
+#include "menu.c"