[thirdparty/linux.git] / scripts / kconfig / lexer.l

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
 */
%option nostdinit noyywrap never-interactive full ecs
%option 8bit nodefault yylineno
%x ASSIGN_VAL HELP STRING
%{

#include <assert.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "lkc.h"
#include "parser.tab.h"

#define YY_DECL		static int yylex1(void)

#define START_STRSIZE	16

static struct {
	struct file *file;
	int lineno;
} current_pos;

static int prev_prev_token = T_EOL;
static int prev_token = T_EOL;
static char *text;
static int text_size, text_asize;

struct buffer {
	struct buffer *parent;
	YY_BUFFER_STATE state;
};

static struct buffer *current_buf;

static int last_ts, first_ts;

static char *expand_token(const char *in, size_t n);
static void append_expanded_string(const char *in);
static void zconf_endhelp(void);
static void zconf_endfile(void);

static void new_string(void)
{
	text = xmalloc(START_STRSIZE);
	text_asize = START_STRSIZE;
	text_size = 0;
	*text = 0;
}

static void append_string(const char *str, int size)
{
	int new_size = text_size + size + 1;
	if (new_size > text_asize) {
		new_size += START_STRSIZE - 1;
		new_size &= -START_STRSIZE;
		text = xrealloc(text, new_size);
		text_asize = new_size;
	}
	memcpy(text + text_size, str, size);
	text_size += size;
	text[text_size] = 0;
}

static void alloc_string(const char *str, int size)
{
	text = xmalloc(size + 1);
	memcpy(text, str, size);
	text[size] = 0;
}

static void warn_ignored_character(char chr)
{
	fprintf(stderr,
	        "%s:%d:warning: ignoring unsupported character '%c'\n",
	        current_file->name, yylineno, chr);
}
%}

n	[A-Za-z0-9_-]

%%
	char open_quote = 0;

#.*			/* ignore comment */
[ \t]*			/* whitespaces */
\\\n			/* escaped new line */
\n			return T_EOL;
"bool"			return T_BOOL;
"choice"		return T_CHOICE;
"comment"		return T_COMMENT;
"config"		return T_CONFIG;
"def_bool"		return T_DEF_BOOL;
"def_tristate"		return T_DEF_TRISTATE;
"default"		return T_DEFAULT;
"depends"		return T_DEPENDS;
"endchoice"		return T_ENDCHOICE;
"endif"			return T_ENDIF;
"endmenu"		return T_ENDMENU;
"help"			return T_HELP;
"hex"			return T_HEX;
"if"			return T_IF;
"imply"			return T_IMPLY;
"int"			return T_INT;
"mainmenu"		return T_MAINMENU;
"menu"			return T_MENU;
"menuconfig"		return T_MENUCONFIG;
"modules"		return T_MODULES;
"on"			return T_ON;
"optional"		return T_OPTIONAL;
"prompt"		return T_PROMPT;
"range"			return T_RANGE;
"select"		return T_SELECT;
"source"		return T_SOURCE;
"string"		return T_STRING;
"tristate"		return T_TRISTATE;
"visible"		return T_VISIBLE;
"||"			return T_OR;
"&&"			return T_AND;
"="			return T_EQUAL;
"!="			return T_UNEQUAL;
"<"			return T_LESS;
"<="			return T_LESS_EQUAL;
">"			return T_GREATER;
">="			return T_GREATER_EQUAL;
"!"			return T_NOT;
"("			return T_OPEN_PAREN;
")"			return T_CLOSE_PAREN;
":="			return T_COLON_EQUAL;
"+="			return T_PLUS_EQUAL;
\"|\'			{
				open_quote = yytext[0];
				new_string();
				BEGIN(STRING);
			}
{n}+			{
				alloc_string(yytext, yyleng);
				yylval.string = text;
				return T_WORD;
			}
({n}|$)+		{
				/* this token includes at least one '$' */
				yylval.string = expand_token(yytext, yyleng);
				if (strlen(yylval.string))
					return T_WORD;
				free(yylval.string);
			}
.			warn_ignored_character(*yytext);

<ASSIGN_VAL>{
	[^[:blank:]\n]+.*	{
		alloc_string(yytext, yyleng);
		yylval.string = text;
		return T_ASSIGN_VAL;
	}
	\n	{ BEGIN(INITIAL); return T_EOL; }
	.
}

<STRING>{
	"$".*	append_expanded_string(yytext);
	[^$'"\\\n]+	{
		append_string(yytext, yyleng);
	}
	\\.?	{
		append_string(yytext + 1, yyleng - 1);
	}
	\'|\"	{
		if (open_quote == yytext[0]) {
			BEGIN(INITIAL);
			yylval.string = text;
			return T_WORD_QUOTE;
		} else
			append_string(yytext, 1);
	}
	\n	{
		fprintf(stderr,
			"%s:%d:warning: multi-line strings not supported\n",
			zconf_curname(), zconf_lineno());
		unput('\n');
		BEGIN(INITIAL);
		yylval.string = text;
		return T_WORD_QUOTE;
	}
	<<EOF>>	{
		BEGIN(INITIAL);
		yylval.string = text;
		return T_WORD_QUOTE;
	}
}

<HELP>{
	[ \t]+	{
		int ts, i;

		ts = 0;
		for (i = 0; i < yyleng; i++) {
			if (yytext[i] == '\t')
				ts = (ts & ~7) + 8;
			else
				ts++;
		}
		last_ts = ts;
		if (first_ts) {
			if (ts < first_ts) {
				zconf_endhelp();
				return T_HELPTEXT;
			}
			ts -= first_ts;
			while (ts > 8) {
				append_string("        ", 8);
				ts -= 8;
			}
			append_string("        ", ts);
		}
	}
	[ \t]*\n/[^ \t\n] {
		zconf_endhelp();
		return T_HELPTEXT;
	}
	[ \t]*\n	{
		append_string("\n", 1);
	}
	[^ \t\n].* {
		while (yyleng) {
			if ((yytext[yyleng-1] != ' ') && (yytext[yyleng-1] != '\t'))
				break;
			yyleng--;
		}
		append_string(yytext, yyleng);
		if (!first_ts)
			first_ts = last_ts;
	}
	<<EOF>>	{
		zconf_endhelp();
		return T_HELPTEXT;
	}
}

<<EOF>>	{
	BEGIN(INITIAL);

	if (prev_token != T_EOL && prev_token != T_HELPTEXT)
		fprintf(stderr, "%s:%d:warning: no new line at end of file\n",
			current_file->name, yylineno);

	if (current_file) {
		zconf_endfile();
		return T_EOL;
	}
	fclose(yyin);
	yyterminate();
}

%%

/* second stage lexer */
int yylex(void)
{
	int token;

repeat:
	token = yylex1();

	if (prev_token == T_EOL || prev_token == T_HELPTEXT) {
		if (token == T_EOL) {
			/* Do not pass unneeded T_EOL to the parser. */
			goto repeat;
		} else {
			/*
			 * For the parser, update file/lineno at the first token
			 * of each statement. Generally, \n is a statement
			 * terminator in Kconfig, but it is not always true
			 * because \n could be escaped by a backslash.
			 */
			current_pos.file = current_file;
			current_pos.lineno = yylineno;
		}
	}

	if (prev_prev_token == T_EOL && prev_token == T_WORD &&
	    (token == T_EQUAL || token == T_COLON_EQUAL || token == T_PLUS_EQUAL))
		BEGIN(ASSIGN_VAL);

	prev_prev_token = prev_token;
	prev_token = token;

	return token;
}

static char *expand_token(const char *in, size_t n)
{
	char *out;
	int c;
	char c2;
	const char *rest, *end;

	new_string();
	append_string(in, n);

	/* get the whole line because we do not know the end of token. */
	while ((c = input()) != EOF) {
		if (c == '\n') {
			unput(c);
			break;
		}
		c2 = c;
		append_string(&c2, 1);
	}

	rest = text;
	out = expand_one_token(&rest);

	/* push back unused characters to the input stream */
	end = rest + strlen(rest);
	while (end > rest)
		unput(*--end);

	free(text);

	return out;
}

static void append_expanded_string(const char *str)
{
	const char *end;
	char *res;

	str++;

	res = expand_dollar(&str);

	/* push back unused characters to the input stream */
	end = str + strlen(str);
	while (end > str)
		unput(*--end);

	append_string(res, strlen(res));

	free(res);
}

void zconf_starthelp(void)
{
	new_string();
	last_ts = first_ts = 0;
	BEGIN(HELP);
}

static void zconf_endhelp(void)
{
	yylval.string = text;
	BEGIN(INITIAL);
}


/*
 * Try to open specified file with following names:
 * ./name
 * $(srctree)/name
 * The latter is used when srctree is separate from objtree
 * when compiling the kernel.
 * Return NULL if file is not found.
 */
FILE *zconf_fopen(const char *name)
{
	char *env, fullname[PATH_MAX+1];
	FILE *f;

	f = fopen(name, "r");
	if (!f && name != NULL && name[0] != '/') {
		env = getenv(SRCTREE);
		if (env) {
			snprintf(fullname, sizeof(fullname),
				 "%s/%s", env, name);
			f = fopen(fullname, "r");
		}
	}
	return f;
}

void zconf_initscan(const char *name)
{
	yyin = zconf_fopen(name);
	if (!yyin) {
		fprintf(stderr, "can't find file %s\n", name);
		exit(1);
	}

	current_buf = xmalloc(sizeof(*current_buf));
	memset(current_buf, 0, sizeof(*current_buf));

	current_file = file_lookup(name);
	yylineno = 1;
}

void zconf_nextfile(const char *name)
{
	struct file *iter;
	struct file *file = file_lookup(name);
	struct buffer *buf = xmalloc(sizeof(*buf));
	memset(buf, 0, sizeof(*buf));

	current_buf->state = YY_CURRENT_BUFFER;
	yyin = zconf_fopen(file->name);
	if (!yyin) {
		fprintf(stderr, "%s:%d: can't open file \"%s\"\n",
			zconf_curname(), zconf_lineno(), file->name);
		exit(1);
	}
	yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
	buf->parent = current_buf;
	current_buf = buf;

	current_file->lineno = yylineno;
	file->parent = current_file;

	for (iter = current_file; iter; iter = iter->parent) {
		if (!strcmp(iter->name, file->name)) {
			fprintf(stderr,
				"Recursive inclusion detected.\n"
				"Inclusion path:\n"
				"  current file : %s\n", file->name);
			iter = file;
			do {
				iter = iter->parent;
				fprintf(stderr, "  included from: %s:%d\n",
					iter->name, iter->lineno - 1);
			} while (strcmp(iter->name, file->name));
			exit(1);
		}
	}

	yylineno = 1;
	current_file = file;
}

static void zconf_endfile(void)
{
	struct buffer *parent;

	current_file = current_file->parent;
	if (current_file)
		yylineno = current_file->lineno;

	parent = current_buf->parent;
	if (parent) {
		fclose(yyin);
		yy_delete_buffer(YY_CURRENT_BUFFER);
		yy_switch_to_buffer(parent->state);
	}
	free(current_buf);
	current_buf = parent;
}

int zconf_lineno(void)
{
	return current_pos.lineno;
}

const char *zconf_curname(void)
{
	return current_pos.file ? current_pos.file->name : "<none>";
}
Commit	Line	Data
0c874100 MY	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	/*
	3	* Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
	4	*/
674eed8a	5	%option nostdinit noyywrap never-interactive full ecs
18492685	6	%option 8bit nodefault yylineno
979f2b2f	7	%x ASSIGN_VAL HELP STRING
1da177e4	8	%{
1da177e4	9
9ced3bdd	10	#include <assert.h>
1da177e4 LT	11	#include <limits.h>
	12	#include <stdio.h>
	13	#include <stdlib.h>
	14	#include <string.h>
1da177e4	15
1da177e4	16	#include "lkc.h"
769a1c02	17	#include "parser.tab.h"
1da177e4	18
cc66bca7 MY	19	#define YY_DECL static int yylex1(void)
cc66bca7 MY	20
1da177e4 LT	21	#define START_STRSIZE 16
1da177e4 LT	22
a02f0570 RZ	23	static struct {
	24	struct file *file;
	25	int lineno;
	26	} current_pos;
	27
824fa3b3	28	static int prev_prev_token = T_EOL;
cc66bca7	29	static int prev_token = T_EOL;
7a88488b	30	static char *text;
1da177e4 LT	31	static int text_size, text_asize;
	32
	33	struct buffer {
bb66fc67 MY	34	struct buffer *parent;
bb66fc67 MY	35	YY_BUFFER_STATE state;
1da177e4 LT	36	};
1da177e4 LT	37
d41809ff	38	static struct buffer *current_buf;
1da177e4 LT	39
	40	static int last_ts, first_ts;
	41
104daea1 MY	42	static char expand_token(const char in, size_t n);
104daea1 MY	43	static void append_expanded_string(const char *in);
1da177e4	44	static void zconf_endhelp(void);
a02f0570	45	static void zconf_endfile(void);
1da177e4	46
65166571	47	static void new_string(void)
1da177e4	48	{
177acf78	49	text = xmalloc(START_STRSIZE);
1da177e4	50	text_asize = START_STRSIZE;
1da177e4	51	text_size = 0;
7a88488b	52	*text = 0;
1da177e4 LT	53	}
1da177e4 LT	54
65166571	55	static void append_string(const char *str, int size)
1da177e4 LT	56	{
	57	int new_size = text_size + size + 1;
	58	if (new_size > text_asize) {
7a88488b RZ	59	new_size += START_STRSIZE - 1;
7a88488b RZ	60	new_size &= -START_STRSIZE;
d717f24d	61	text = xrealloc(text, new_size);
1da177e4	62	text_asize = new_size;
1da177e4	63	}
7a88488b	64	memcpy(text + text_size, str, size);
1da177e4	65	text_size += size;
7a88488b	66	text[text_size] = 0;
1da177e4 LT	67	}
1da177e4 LT	68
65166571	69	static void alloc_string(const char *str, int size)
1da177e4	70	{
177acf78	71	text = xmalloc(size + 1);
1da177e4 LT	72	memcpy(text, str, size);
	73	text[size] = 0;
	74	}
c2264564 AR	75
	76	static void warn_ignored_character(char chr)
	77	{
	78	fprintf(stderr,
	79	"%s:%d:warning: ignoring unsupported character '%c'\n",
77c1c0fa	80	current_file->name, yylineno, chr);
c2264564	81	}
1da177e4 LT	82	%}
1da177e4 LT	83
c2264564	84	n [A-Za-z0-9_-]
1da177e4 LT	85
1da177e4 LT	86	%%
6988f70c	87	char open_quote = 0;
1da177e4	88
979f2b2f MY	89	#.* /* ignore comment */
	90	[ \t]* /* whitespaces */
	91	\\\n /* escaped new line */
	92	\n return T_EOL;
979f2b2f MY	93	"bool" return T_BOOL;
	94	"choice" return T_CHOICE;
	95	"comment" return T_COMMENT;
	96	"config" return T_CONFIG;
	97	"def_bool" return T_DEF_BOOL;
	98	"def_tristate" return T_DEF_TRISTATE;
	99	"default" return T_DEFAULT;
979f2b2f MY	100	"depends" return T_DEPENDS;
	101	"endchoice" return T_ENDCHOICE;
	102	"endif" return T_ENDIF;
	103	"endmenu" return T_ENDMENU;
f70f74d1	104	"help" return T_HELP;
979f2b2f MY	105	"hex" return T_HEX;
	106	"if" return T_IF;
	107	"imply" return T_IMPLY;
	108	"int" return T_INT;
	109	"mainmenu" return T_MAINMENU;
	110	"menu" return T_MENU;
	111	"menuconfig" return T_MENUCONFIG;
	112	"modules" return T_MODULES;
	113	"on" return T_ON;
979f2b2f MY	114	"optional" return T_OPTIONAL;
	115	"prompt" return T_PROMPT;
	116	"range" return T_RANGE;
	117	"select" return T_SELECT;
	118	"source" return T_SOURCE;
	119	"string" return T_STRING;
	120	"tristate" return T_TRISTATE;
	121	"visible" return T_VISIBLE;
	122	"\|\|" return T_OR;
	123	"&&" return T_AND;
	124	"=" return T_EQUAL;
	125	"!=" return T_UNEQUAL;
	126	"<" return T_LESS;
	127	"<=" return T_LESS_EQUAL;
	128	">" return T_GREATER;
	129	">=" return T_GREATER_EQUAL;
	130	"!" return T_NOT;
	131	"(" return T_OPEN_PAREN;
	132	")" return T_CLOSE_PAREN;
	133	":=" return T_COLON_EQUAL;
	134	"+=" return T_PLUS_EQUAL;
	135	\"\|\' {
6988f70c	136	open_quote = yytext[0];
979f2b2f MY	137	new_string();
	138	BEGIN(STRING);
	139	}
	140	{n}+ {
	141	alloc_string(yytext, yyleng);
	142	yylval.string = text;
	143	return T_WORD;
	144	}
	145	({n}\|$)+ {
	146	/* this token includes at least one '$' */
	147	yylval.string = expand_token(yytext, yyleng);
	148	if (strlen(yylval.string))
	149	return T_WORD;
	150	free(yylval.string);
	151	}
	152	. warn_ignored_character(*yytext);
1da177e4	153
9ced3bdd MY	154	<ASSIGN_VAL>{
	155	[^[:blank:]\n]+.* {
	156	alloc_string(yytext, yyleng);
	157	yylval.string = text;
	158	return T_ASSIGN_VAL;
	159	}
	160	\n { BEGIN(INITIAL); return T_EOL; }
	161	.
	162	}
	163
1da177e4	164	<STRING>{
104daea1	165	"$".* append_expanded_string(yytext);
104daea1	166	[^$'"\\\n]+ {
1da177e4 LT	167	append_string(yytext, yyleng);
1da177e4 LT	168	}
1da177e4 LT	169	\\.? {
	170	append_string(yytext + 1, yyleng - 1);
	171	}
	172	\'\|\" {
6988f70c	173	if (open_quote == yytext[0]) {
979f2b2f	174	BEGIN(INITIAL);
765f4cde	175	yylval.string = text;
1da177e4 LT	176	return T_WORD_QUOTE;
	177	} else
	178	append_string(yytext, 1);
	179	}
	180	\n {
9e3e10c7 MY	181	fprintf(stderr,
	182	"%s:%d:warning: multi-line strings not supported\n",
	183	zconf_curname(), zconf_lineno());
21c5ecf6	184	unput('\n');
1da177e4	185	BEGIN(INITIAL);
21c5ecf6 MY	186	yylval.string = text;
21c5ecf6 MY	187	return T_WORD_QUOTE;
1da177e4 LT	188	}
	189	<<EOF>> {
	190	BEGIN(INITIAL);
fbac5977 MY	191	yylval.string = text;
fbac5977 MY	192	return T_WORD_QUOTE;
1da177e4 LT	193	}
	194	}
	195
	196	<HELP>{
	197	[ \t]+ {
65017d83 MY	198	int ts, i;
65017d83 MY	199
1da177e4 LT	200	ts = 0;
	201	for (i = 0; i < yyleng; i++) {
	202	if (yytext[i] == '\t')
	203	ts = (ts & ~7) + 8;
	204	else
	205	ts++;
	206	}
	207	last_ts = ts;
	208	if (first_ts) {
	209	if (ts < first_ts) {
	210	zconf_endhelp();
	211	return T_HELPTEXT;
	212	}
	213	ts -= first_ts;
	214	while (ts > 8) {
	215	append_string(" ", 8);
	216	ts -= 8;
	217	}
	218	append_string(" ", ts);
	219	}
	220	}
	221	[ \t]*\n/[^ \t\n] {
1da177e4 LT	222	zconf_endhelp();
	223	return T_HELPTEXT;
	224	}
	225	[ \t]*\n {
1da177e4 LT	226	append_string("\n", 1);
	227	}
	228	[^ \t\n].* {
f7a4b4cd EG	229	while (yyleng) {
	230	if ((yytext[yyleng-1] != ' ') && (yytext[yyleng-1] != '\t'))
	231	break;
	232	yyleng--;
	233	}
1da177e4 LT	234	append_string(yytext, yyleng);
	235	if (!first_ts)
	236	first_ts = last_ts;
	237	}
	238	<<EOF>> {
	239	zconf_endhelp();
	240	return T_HELPTEXT;
	241	}
	242	}
	243
	244	<<EOF>> {
0bcc547e MY	245	BEGIN(INITIAL);
0bcc547e MY	246
72367933 MY	247	if (prev_token != T_EOL && prev_token != T_HELPTEXT)
	248	fprintf(stderr, "%s:%d:warning: no new line at end of file\n",
	249	current_file->name, yylineno);
	250
a02f0570	251	if (current_file) {
1da177e4	252	zconf_endfile();
a02f0570	253	return T_EOL;
1da177e4 LT	254	}
	255	fclose(yyin);
	256	yyterminate();
	257	}
	258
	259	%%
cc66bca7 MY	260
	261	/* second stage lexer */
	262	int yylex(void)
	263	{
	264	int token;
	265
	266	repeat:
	267	token = yylex1();
	268
4b31a32c MY	269	if (prev_token == T_EOL \|\| prev_token == T_HELPTEXT) {
	270	if (token == T_EOL) {
	271	/* Do not pass unneeded T_EOL to the parser. */
	272	goto repeat;
	273	} else {
	274	/*
	275	* For the parser, update file/lineno at the first token
	276	* of each statement. Generally, \n is a statement
	277	* terminator in Kconfig, but it is not always true
	278	* because \n could be escaped by a backslash.
	279	*/
	280	current_pos.file = current_file;
	281	current_pos.lineno = yylineno;
	282	}
	283	}
cc66bca7	284
824fa3b3 MY	285	if (prev_prev_token == T_EOL && prev_token == T_WORD &&
	286	(token == T_EQUAL \|\| token == T_COLON_EQUAL \|\| token == T_PLUS_EQUAL))
	287	BEGIN(ASSIGN_VAL);
	288
	289	prev_prev_token = prev_token;
cc66bca7 MY	290	prev_token = token;
	291
	292	return token;
	293	}
	294
104daea1 MY	295	static char expand_token(const char in, size_t n)
	296	{
	297	char *out;
	298	int c;
	299	char c2;
	300	const char rest, end;
	301
	302	new_string();
	303	append_string(in, n);
	304
	305	/* get the whole line because we do not know the end of token. */
	306	while ((c = input()) != EOF) {
	307	if (c == '\n') {
	308	unput(c);
	309	break;
	310	}
	311	c2 = c;
	312	append_string(&c2, 1);
	313	}
	314
	315	rest = text;
	316	out = expand_one_token(&rest);
	317
	318	/* push back unused characters to the input stream */
	319	end = rest + strlen(rest);
	320	while (end > rest)
	321	unput(*--end);
	322
	323	free(text);
	324
	325	return out;
	326	}
	327
	328	static void append_expanded_string(const char *str)
	329	{
	330	const char *end;
	331	char *res;
	332
	333	str++;
	334
	335	res = expand_dollar(&str);
	336
	337	/* push back unused characters to the input stream */
	338	end = str + strlen(str);
	339	while (end > str)
	340	unput(*--end);
	341
	342	append_string(res, strlen(res));
	343
	344	free(res);
	345	}
	346
1da177e4 LT	347	void zconf_starthelp(void)
	348	{
	349	new_string();
	350	last_ts = first_ts = 0;
	351	BEGIN(HELP);
	352	}
	353
	354	static void zconf_endhelp(void)
	355	{
765f4cde	356	yylval.string = text;
1da177e4 LT	357	BEGIN(INITIAL);
	358	}
	359
	360
	361	/*
	362	* Try to open specified file with following names:
	363	* ./name
	364	* $(srctree)/name
	365	* The latter is used when srctree is separate from objtree
	366	* when compiling the kernel.
	367	* Return NULL if file is not found.
	368	*/
	369	FILE zconf_fopen(const char name)
	370	{
	371	char *env, fullname[PATH_MAX+1];
	372	FILE *f;
	373
	374	f = fopen(name, "r");
11de39e2	375	if (!f && name != NULL && name[0] != '/') {
1da177e4 LT	376	env = getenv(SRCTREE);
1da177e4 LT	377	if (env) {
b9d1a8e9 JG	378	snprintf(fullname, sizeof(fullname),
b9d1a8e9 JG	379	"%s/%s", env, name);
1da177e4 LT	380	f = fopen(fullname, "r");
	381	}
	382	}
	383	return f;
	384	}
	385
	386	void zconf_initscan(const char *name)
	387	{
	388	yyin = zconf_fopen(name);
	389	if (!yyin) {
9e3e10c7	390	fprintf(stderr, "can't find file %s\n", name);
1da177e4 LT	391	exit(1);
	392	}
	393
177acf78	394	current_buf = xmalloc(sizeof(*current_buf));
1da177e4 LT	395	memset(current_buf, 0, sizeof(*current_buf));
	396
	397	current_file = file_lookup(name);
18492685	398	yylineno = 1;
1da177e4 LT	399	}
	400
	401	void zconf_nextfile(const char *name)
	402	{
f094f8a1	403	struct file *iter;
1da177e4	404	struct file *file = file_lookup(name);
177acf78	405	struct buffer buf = xmalloc(sizeof(buf));
1da177e4 LT	406	memset(buf, 0, sizeof(*buf));
	407
	408	current_buf->state = YY_CURRENT_BUFFER;
e82dae90	409	yyin = zconf_fopen(file->name);
1da177e4	410	if (!yyin) {
9e3e10c7 MY	411	fprintf(stderr, "%s:%d: can't open file \"%s\"\n",
9e3e10c7 MY	412	zconf_curname(), zconf_lineno(), file->name);
1da177e4 LT	413	exit(1);
	414	}
	415	yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
	416	buf->parent = current_buf;
	417	current_buf = buf;
	418
18492685	419	current_file->lineno = yylineno;
379a8eb8 MY	420	file->parent = current_file;
	421
	422	for (iter = current_file; iter; iter = iter->parent) {
	423	if (!strcmp(iter->name, file->name)) {
9e3e10c7	424	fprintf(stderr,
32a94b8b MY	425	"Recursive inclusion detected.\n"
32a94b8b MY	426	"Inclusion path:\n"
379a8eb8 MY	427	" current file : %s\n", file->name);
379a8eb8 MY	428	iter = file;
5ae6fcc4	429	do {
f094f8a1	430	iter = iter->parent;
32a94b8b	431	fprintf(stderr, " included from: %s:%d\n",
5ae6fcc4	432	iter->name, iter->lineno - 1);
379a8eb8	433	} while (strcmp(iter->name, file->name));
f094f8a1 YM	434	exit(1);
f094f8a1 YM	435	}
1da177e4	436	}
379a8eb8	437
18492685	438	yylineno = 1;
1da177e4 LT	439	current_file = file;
	440	}
	441
a02f0570	442	static void zconf_endfile(void)
1da177e4 LT	443	{
	444	struct buffer *parent;
	445
1da177e4	446	current_file = current_file->parent;
18492685 MY	447	if (current_file)
18492685 MY	448	yylineno = current_file->lineno;
1da177e4 LT	449
	450	parent = current_buf->parent;
	451	if (parent) {
	452	fclose(yyin);
	453	yy_delete_buffer(YY_CURRENT_BUFFER);
	454	yy_switch_to_buffer(parent->state);
	455	}
	456	free(current_buf);
	457	current_buf = parent;
1da177e4 LT	458	}
	459
	460	int zconf_lineno(void)
	461	{
a02f0570	462	return current_pos.lineno;
1da177e4 LT	463	}
1da177e4 LT	464
2e7a0918	465	const char *zconf_curname(void)
1da177e4	466	{
a02f0570	467	return current_pos.file ? current_pos.file->name : "<none>";
1da177e4	468	}