libfdt: Add fdt_get_name() to retrieve a node's name

This patch adds a new fdt_get_name() function to libfdt which will
return a node's name string (including unit address, if any).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

2 files changed, 26 insertions, 0 deletions

diff --git a/libfdt/fdt_ro.c b/libfdt/fdt_ro.c
index e7a78de..9ff862b 100644
--- a/libfdt/fdt_ro.c
+++ b/libfdt/fdt_ro.c
@@ -169,6 +169,30 @@ int fdt_path_offset(const void *fdt, const char *path)
 	return offset;	
 }
 
+const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
+{
+	const struct fdt_node_header *nh;
+	int err;
+
+	if ((err = _fdt_check_header(fdt)) != 0)
+		goto fail;
+
+	err = -FDT_ERR_BADOFFSET;
+	nh = fdt_offset_ptr(fdt, nodeoffset, sizeof(*nh));
+	if (!nh || (fdt32_to_cpu(nh->tag) != FDT_BEGIN_NODE))
+		goto fail;
+
+	if (len)
+		*len = strlen(nh->name);
+
+	return nh->name;
+
+ fail:
+	if (len)
+		*len = err;
+	return NULL;
+}
+
 const struct fdt_property *fdt_get_property(const void *fdt,
 					    int nodeoffset,
 					    const char *name, int *lenp)
diff --git a/libfdt/libfdt.h b/libfdt/libfdt.h
index d33a64f..f8fd459 100644
--- a/libfdt/libfdt.h
+++ b/libfdt/libfdt.h
@@ -115,6 +115,8 @@ int fdt_subnode_offset(const void *fdt, int parentoffset, const char *name);
 
 int fdt_path_offset(const void *fdt, const char *path);
 
+const char *fdt_get_name(const void *fdt, int nodeoffset, int *baselen);
+
 const struct fdt_property *fdt_get_property(const void *fdt, int nodeoffset,
 					    const char *name, int *lenp);