linux-kernel - [PATCH v4 17/31] kconfig: add 'filename' and 'lineno' built-in variables

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Date:   Thu, 17 May 2018 15:16:56 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-kbuild@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Ulf Magnusson <ulfalizer@...il.com>,
        "Luis R . Rodriguez" <mcgrof@...nel.org>,
        linux-kernel@...r.kernel.org, Nicholas Piggin <npiggin@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Emese Revfy <re.emese@...il.com>, x86@...nel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: [PATCH v4 17/31] kconfig: add 'filename' and 'lineno' built-in variables

The special variables, $(filename) and $(lineno), are expanded to a
file name and its line number being parsed, respectively.

Suggested-by: Randy Dunlap <rdunlap@...radead.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

Changes in v4:
 - Newly added

Changes in v3: None
Changes in v2: None

 scripts/kconfig/preprocess.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/scripts/kconfig/preprocess.c b/scripts/kconfig/preprocess.c
index 88844a7..c39e30e 100644
--- a/scripts/kconfig/preprocess.c
+++ b/scripts/kconfig/preprocess.c
@@ -111,6 +111,11 @@ static char *do_error(int argc, char *argv[], int old_argc, char *old_argv[])
 	return NULL;
 }
 
+static char *do_filename(int argc, char *argv[], int old_argc, char *old_argv[])
+{
+	return xstrdup(current_file->name);
+}
+
 static char *do_if(int argc, char *argv[], int old_argc, char *old_argv[])
 {
 	char *cond, *p, *res;
@@ -144,6 +149,15 @@ static char *do_info(int argc, char *argv[], int old_argc, char *old_argv[])
 	return xstrdup("");
 }
 
+static char *do_lineno(int argc, char *argv[], int old_argc, char *old_argv[])
+{
+	char buf[16];
+
+	sprintf(buf, "%d", yylineno);
+
+	return xstrdup(buf);
+}
+
 static char *do_shell(int argc, char *argv[], int old_argc, char *old_argv[])
 {
 	FILE *p;
@@ -194,8 +208,10 @@ static char *do_warning(int argc, char *argv[], int old_argc, char *old_argv[])
 static const struct function function_table[] = {
 	/* Name		MIN	MAX	EXP?	Function */
 	{ "error",	1,	1,	true,	do_error },
+	{ "filename",	0,	0,	false,	do_filename },
 	{ "if",		2,	3,	false,	do_if },
 	{ "info",	1,	1,	true,	do_info },
+	{ "lineno",	0,	0,	false,	do_lineno },
 	{ "shell",	1,	1,	true,	do_shell },
 	{ "warning",	1,	1,	true,	do_warning },
 };
-- 
2.7.4