[PATCH 1/2] dtc: cpp co-existence: allow names starting with # to be escaped
Stephen Warren
swarren at wwwdotorg.org
Tue Sep 25 08:51:16 EST 2012
From: Stephen Warren <swarren at nvidia.com>
The device tree language as currently defined conflicts with the C pre-
processor in one aspect - when a property or node name begins with a #
character, a pre-processor would attempt to interpret it as a directive,
fail, and most likely error out.
This change allows a property/node name to be prefixed with \. This
prevents a pre-processor from seeing # as the first non-whitespace
character on the line, and hence prevents the conflict. \ was previously
an illegal character in property/node names, so this change is
backwards compatible. The \ is stripped from the name during parsing
by dtc.
Signed-off-by: Stephen Warren <swarren at nvidia.com>
---
dtc-lexer.l | 5 +++--
tests/.gitignore | 1 +
tests/Makefile.tests | 2 +-
tests/propname_escapes.c | 43 +++++++++++++++++++++++++++++++++++++++++++
tests/propname_escapes.dts | 6 ++++++
tests/run_tests.sh | 3 +++
6 files changed, 57 insertions(+), 3 deletions(-)
create mode 100644 tests/propname_escapes.c
create mode 100644 tests/propname_escapes.dts
diff --git a/dtc-lexer.l b/dtc-lexer.l
index 91c4930..edbeb86 100644
--- a/dtc-lexer.l
+++ b/dtc-lexer.l
@@ -162,9 +162,10 @@ static int pop_input_file(void);
return ']';
}
-<PROPNODENAME>{PROPNODECHAR}+ {
+<PROPNODENAME>\\?{PROPNODECHAR}+ {
DPRINT("PropNodeName: %s\n", yytext);
- yylval.propnodename = xstrdup(yytext);
+ yylval.propnodename = xstrdup((yytext[0] == '\\') ?
+ yytext + 1 : yytext);
BEGIN_DEFAULT();
return DT_PROPNODENAME;
}
diff --git a/tests/.gitignore b/tests/.gitignore
index f8e1af0..e2aa24a 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -39,6 +39,7 @@ tmp.*
/path_offset
/path_offset_aliases
/phandle_format
+/propname_escapes
/references
/root_node
/rw_tree1
diff --git a/tests/Makefile.tests b/tests/Makefile.tests
index 1795466..d59bff8 100644
--- a/tests/Makefile.tests
+++ b/tests/Makefile.tests
@@ -12,7 +12,7 @@ LIB_TESTS_L = get_mem_rsv \
sw_tree1 \
move_and_save mangle-layout nopulate \
open_pack rw_tree1 set_name setprop del_property del_node \
- appendprop1 appendprop2 \
+ appendprop1 appendprop2 propname_escapes \
string_escapes references path-references phandle_format \
boot-cpuid incbin \
extra-terminating-null \
diff --git a/tests/propname_escapes.c b/tests/propname_escapes.c
new file mode 100644
index 0000000..3aec28f
--- /dev/null
+++ b/tests/propname_escapes.c
@@ -0,0 +1,43 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Testcase for fdt_getprop()
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "tests.h"
+
+int main(int argc, char *argv[])
+{
+ void *fdt;
+
+ test_init(argc, argv);
+ fdt = load_blob_arg(argc, argv);
+
+ check_getprop_cell(fdt, 0, "#address-cells", 1);
+ check_getprop_cell(fdt, 0, "#gpio-cells", 2);
+
+ PASS();
+}
diff --git a/tests/propname_escapes.dts b/tests/propname_escapes.dts
new file mode 100644
index 0000000..9f70618
--- /dev/null
+++ b/tests/propname_escapes.dts
@@ -0,0 +1,6 @@
+/dts-v1/;
+
+/ {
+ #address-cells = <1>;
+ \#gpio-cells = <2>;
+};
diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index e2158f7..7d7a5f7 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -254,6 +254,9 @@ dtc_tests () {
tree1_tests_rw dtc_tree1.test.dtb
run_test dtbs_equal_ordered dtc_tree1.test.dtb test_tree1.dtb
+ run_dtc_test -I dts -O dtb -o dtc_escapes.test.dtb propname_escapes.dts
+ run_test propname_escapes dtc_escapes.test.dtb
+
run_dtc_test -I dts -O dtb -o dtc_escapes.test.dtb escapes.dts
run_test string_escapes dtc_escapes.test.dtb
--
1.7.0.4
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