[Crosstoolchain-logs] [device-tree-compiler] 29/58: libfdt: Add fdt_setprop_empty()
Vagrant Cascadian
vagrant at moszumanska.debian.org
Mon Sep 25 16:23:47 UTC 2017
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vagrant pushed a commit to branch debian/master
in repository device-tree-compiler.
commit 397d5ef0203ce4fa59dae5142645d364412dc962
Author: David Gibson <david at gibson.dropbear.id.au>
Date: Fri Feb 24 11:12:50 2017 +1100
libfdt: Add fdt_setprop_empty()
Device trees can contain empty (zero length) properties, which are often
used as boolean flags. These can already be created using fdt_setprop()
passing a length of zero and a pointer which is ignored. It is safe to
pass NULL, but that may not be obvious from the interface. To make it
clearer, add an fdt_setprop_empty() helper macro.
Signed-off-by: David Gibson <david at gibson.dropbear.id.au>
---
libfdt/libfdt.h | 30 ++++++++++++++++++++++++++++++
tests/setprop.c | 2 +-
2 files changed, 31 insertions(+), 1 deletion(-)
diff --git a/libfdt/libfdt.h b/libfdt/libfdt.h
index c69e918..ac42e04 100644
--- a/libfdt/libfdt.h
+++ b/libfdt/libfdt.h
@@ -1527,6 +1527,36 @@ static inline int fdt_setprop_cell(void *fdt, int nodeoffset, const char *name,
#define fdt_setprop_string(fdt, nodeoffset, name, str) \
fdt_setprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
+
+/**
+ * fdt_setprop_empty - set a property to an empty value
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to change
+ * @name: name of the property to change
+ *
+ * fdt_setprop_empty() sets the value of the named property in the
+ * given node to an empty (zero length) value, or creates a new empty
+ * property if it does not already exist.
+ *
+ * This function may insert or delete data from the blob, and will
+ * therefore change the offsets of some existing nodes.
+ *
+ * returns:
+ * 0, on success
+ * -FDT_ERR_NOSPACE, there is insufficient free space in the blob to
+ * contain the new property value
+ * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ * -FDT_ERR_BADLAYOUT,
+ * -FDT_ERR_BADMAGIC,
+ * -FDT_ERR_BADVERSION,
+ * -FDT_ERR_BADSTATE,
+ * -FDT_ERR_BADSTRUCTURE,
+ * -FDT_ERR_BADLAYOUT,
+ * -FDT_ERR_TRUNCATED, standard meanings
+ */
+#define fdt_setprop_empty(fdt, nodeoffset, name) \
+ fdt_setprop((fdt), (nodeoffset), (name), NULL, 0)
+
/**
* fdt_appendprop - append to or create a property
* @fdt: pointer to the device tree blob
diff --git a/tests/setprop.c b/tests/setprop.c
index d089f8d..be1b147 100644
--- a/tests/setprop.c
+++ b/tests/setprop.c
@@ -66,7 +66,7 @@ int main(int argc, char *argv[])
TEST_STRING_1);
verbose_printf("Old string value was \"%s\"\n", strp);
- err = fdt_setprop(fdt, 0, "prop-str", NULL, 0);
+ err = fdt_setprop_empty(fdt, 0, "prop-str");
if (err)
FAIL("Failed to empty \"prop-str\": %s",
fdt_strerror(err));
--
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