[PATCH] kconfig: config file parse update

- search for config files under $srctree (by Sam Ravnborg & me)
- allow to break long lines with \

scripts/kconfig/confdata.c

@@ -3,6 +3,7 @@
  * Released under the terms of the GNU GPL v2.0.
  */
 
+#include <sys/stat.h>
 #include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -53,7 +54,18 @@ static char *conf_expand_value(const char *in)
 
 char *conf_get_default_confname(void)
 {
-	return conf_expand_value(conf_defname);
+	struct stat buf;
+	static char fullname[PATH_MAX+1];
+	char *env, *name;
+
+	name = conf_expand_value(conf_defname);
+	env = getenv(SRCTREE);
+	if (env) {
+		sprintf(fullname, "%s/%s", env, name);
+		if (!stat(fullname, &buf))
+			return fullname;
+	}
+	return name;
 }
 
 int conf_read(const char *name)
@@ -68,12 +80,12 @@ int conf_read(const char *name)
 	int i;
 
 	if (name) {
-		in = fopen(name, "r");
+		in = zconf_fopen(name);
 	} else {
 		const char **names = conf_confnames;
 		while ((name = *names++)) {
 			name = conf_expand_value(name);
-			in = fopen(name, "r");
+			in = zconf_fopen(name);
 			if (in) {
 				printf("#\n"
 				       "# using defaults found in %s\n"

scripts/kconfig/lkc.h

@@ -21,12 +21,14 @@ extern "C" {
 #include "lkc_proto.h"
 #undef P
 
-void symbol_end(char *help);
+#define SRCTREE "srctree"
+
 int zconfparse(void);
 void zconfdump(FILE *out);
 
 extern int zconfdebug;
 void zconf_starthelp(void);
+FILE *zconf_fopen(const char *name);
 void zconf_initscan(const char *name);
 void zconf_nextfile(const char *name);
 int zconf_lineno(void);

scripts/kconfig/zconf.l

@@ -7,6 +7,7 @@
  * Released under the terms of the GNU GPL v2.0.
  */
 
+#include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -14,7 +15,6 @@
 
 #define LKC_DIRECT_LINK
 #include "lkc.h"
-#include "zconf.tab.h"
 
 #define START_STRSIZE	16
 
@@ -141,6 +141,7 @@ n	[A-Za-z0-9_]
 		zconflval.string = text;
 		return T_WORD;
 	}
+	\\\n	current_file->lineno++;
 	.
 	<<EOF>> {
 		BEGIN(INITIAL);
@@ -157,12 +158,12 @@ n	[A-Za-z0-9_]
 		append_string(yytext, yyleng);
 	}
 	\\.?/\n	{
-		append_string(yytext+1, yyleng);
+		append_string(yytext + 1, yyleng - 1);
 		zconflval.string = text;
 		return T_STRING;
 	}
 	\\.?	{
-		append_string(yytext+1, yyleng - 1);
+		append_string(yytext + 1, yyleng - 1);
 	}
 	\'|\"	{
 		if (str == yytext[0]) {
@@ -174,6 +175,7 @@ n	[A-Za-z0-9_]
 	}
 	\n	{
 		printf("%s:%d:warning: multi-line strings not supported\n", zconf_curname(), zconf_lineno());
+		current_file->lineno++;
 		BEGIN(INITIAL);
 		return T_EOL;
 	}
@@ -249,9 +251,34 @@ static void zconf_endhelp(void)
 	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[0] != '/') {
+		env = getenv(SRCTREE);
+		if (env) {
+			sprintf(fullname, "%s/%s", env, name);
+			f = fopen(fullname, "r");
+		}
+	}
+	return f;
+}
+
 void zconf_initscan(const char *name)
 {
-	yyin = fopen(name, "r");
+	yyin = zconf_fopen(name);
 	if (!yyin) {
 		printf("can't find file %s\n", name);
 		exit(1);
@@ -272,7 +299,7 @@ void zconf_nextfile(const char *name)
 	memset(buf, 0, sizeof(*buf));
 
 	current_buf->state = YY_CURRENT_BUFFER;
-	yyin = fopen(name, "r");
+	yyin = zconf_fopen(name);
 	if (!yyin) {
 		printf("%s:%d: can't open file \"%s\"\n", zconf_curname(), zconf_lineno(), name);
 		exit(1);