tools: support rsource in MSYS config

tools/kconfig/kconfig-language.txt

@@ -259,6 +259,7 @@ end a menu entry:
 - menu/endmenu
 - if/endif
 - source
+- rsource
 The first five also start the definition of a menu entry.
 
 config:
@@ -333,6 +334,14 @@ source:
 
 This reads the specified configuration file. This file is always parsed.
 
+rsource:
+
+	"rsource" <prompt>
+
+This reads the specified configuration file relative to the current file. This file is always parsed.
+
+
+
 mainmenu:
 
 	"mainmenu" <prompt>

tools/kconfig/lkc.h

@@ -72,10 +72,11 @@ void zconfdump(FILE *out);
 void zconf_starthelp(void);
 FILE *zconf_fopen(const char *name);
 void zconf_initscan(const char *name);
-void zconf_nextfile(const char *name);
-void zconf_nextfiles(const char *name);
+void zconf_nextfile(const char *name, bool relative);
+void zconf_nextfiles(const char *name, bool relative);
 int zconf_lineno(void);
 const char *zconf_curname(void);
+const char *zconf_curdir(void);
 
 /* confdata.c */
 const char *conf_get_configname(void);
@@ -112,7 +113,7 @@ void menu_finalize(struct menu *parent);
 void menu_set_type(int type);
 
 /* util.c */
-struct file *file_lookup(const char *name);
+struct file *file_lookup(const char *name, bool relative);
 int file_write_dep(const char *name);
 void *xmalloc(size_t size);
 void *xcalloc(size_t nmemb, size_t size);

tools/kconfig/util.c

@@ -8,13 +8,28 @@
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
+#include <limits.h>
+#include <libgen.h>
 #include "lkc.h"
 
 /* file already present in list? If not add it */
-struct file *file_lookup(const char *name)
+struct file *file_lookup(const char *name, bool relative)
 {
 	struct file *file;
-	const char *file_name = sym_expand_string_value(name);
+	char fullname[PATH_MAX + 1] = { 0 };
+
+	if (relative) {
+		char *last_bslash = strrchr(zconf_curname(), '\\');
+		char *last_fslash = strrchr(zconf_curname(), '/');
+		char *last_slash = last_bslash ? last_bslash : last_fslash;
+		strncpy(fullname, zconf_curname(), last_slash - zconf_curname());
+		strcat(fullname, last_bslash ? "\\" : "/");
+		strcat(fullname, name);
+	} else {
+		sprintf(fullname, "%s", name);
+	}
+
+	const char *file_name = sym_expand_string_value(fullname);
 
 	for (file = file_list; file; file = file->next) {
 		if (!strcmp(name, file->name)) {

tools/kconfig/zconf.gperf

@@ -14,6 +14,7 @@ mainmenu,	T_MAINMENU,	TF_COMMAND
 menu,		T_MENU,		TF_COMMAND
 endmenu,	T_ENDMENU,	TF_COMMAND
 source,		T_SOURCE,	TF_COMMAND
+rsource,	T_RSOURCE,	TF_COMMAND
 choice,		T_CHOICE,	TF_COMMAND
 endchoice,	T_ENDCHOICE,	TF_COMMAND
 comment,	T_COMMENT,	TF_COMMAND

tools/kconfig/zconf.l

@@ -281,6 +281,7 @@ FILE *zconf_fopen(const char *name)
 	FILE *f;
 
 	f = fopen(name, "r");
+
 	if (!f && name != NULL && name[0] != '/') {
 		env = getenv(SRCTREE);
 		if (env) {
@@ -302,14 +303,14 @@ void zconf_initscan(const char *name)
 	current_buf = xmalloc(sizeof(*current_buf));
 	memset(current_buf, 0, sizeof(*current_buf));
 
-	current_file = file_lookup(name);
+	current_file = file_lookup(name, false);
 	current_file->lineno = 1;
 }
 
-void zconf_nextfile(const char *name)
+void zconf_nextfile(const char *name, bool relative)
 {
 	struct file *iter;
-	struct file *file = file_lookup(name);
+	struct file *file = file_lookup(name, relative);
 	struct buffer *buf = xmalloc(sizeof(*buf));
 	memset(buf, 0, sizeof(*buf));
 
@@ -348,7 +349,7 @@ void zconf_nextfile(const char *name)
 	current_file = file;
 }
 
-void zconf_nextfiles(const char *expression)
+void zconf_nextfiles(const char *expression, bool relative)
 {
 	/* Expand environment variables in 'expression' */
 	char* str = expand_environment(expression, zconf_curname(), zconf_lineno());
@@ -364,13 +365,13 @@ void zconf_nextfiles(const char *expression)
 			if(*pos == ' ') {
 				*pos = '\0'; // split buffer into multiple c-strings
 				if (strlen(pos + 1)) {
-					zconf_nextfile(pos + 1);
+					zconf_nextfile(pos + 1, relative);
 				}
 			}
 		}
 
 		if (strlen(str)) { // re-check as first character may have been a space
-			zconf_nextfile(str);
+			zconf_nextfile(str, relative);
 		}
 	}
 
@@ -401,4 +402,4 @@ int zconf_lineno(void)
 const char *zconf_curname(void)
 {
 	return current_pos.file ? current_pos.file->name : "<none>";
-}
+}

tools/kconfig/zconf.y

@@ -48,6 +48,7 @@ static struct menu *current_menu, *current_entry;
 %token <id>T_MENU
 %token <id>T_ENDMENU
 %token <id>T_SOURCE
+%token <id>T_RSOURCE
 %token <id>T_CHOICE
 %token <id>T_ENDCHOICE
 %token <id>T_COMMENT
@@ -135,6 +136,7 @@ common_stmt:
 	| config_stmt
 	| menuconfig_stmt
 	| source_stmt
+	| rsource_stmt
 ;
 
 option_error:
@@ -395,7 +397,13 @@ menu_block:
 source_stmt: T_SOURCE prompt T_EOL
 {
 	printd(DEBUG_PARSE, "%s:%d:source %s\n", zconf_curname(), zconf_lineno(), $2);
-	zconf_nextfiles($2);
+	zconf_nextfiles($2, false);
+};
+
+rsource_stmt: T_RSOURCE prompt T_EOL
+{
+	printd(DEBUG_PARSE, "%s:%d:rsource %s\n", zconf_curname(), zconf_lineno(), $2);
+	zconf_nextfiles($2, true);
 };
 
 /* comment entry */