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libfdt: Add fdt_get_path() function

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This patch adds an fdt_get_path() function to libfdt, which returns
the full path of a given node in a caller supplied buffer.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
David Gibson 2007-08-30 14:54:04 +10:00 • committed by Jon Loeliger
parent 9d26eabdc6
commit 037db263e0
5 changed files with 161 additions and 1 deletions
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tests/get_path.c Normal file
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/*
* libfdt - Flat Device Tree manipulation
* Testcase for fdt_get_path()
* Copyright (C) 2006 David Gibson, IBM Corporation.
*
* 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
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <fdt.h>
#include <libfdt.h>
#include "tests.h"
#include "testdata.h"
#define POISON ('\xff')
void check_path_buf(void *fdt, const char *path, int pathlen, int buflen)
{
int offset;
char buf[buflen+1];
int len;
offset = fdt_path_offset(fdt, path);
if (offset < 0)
FAIL("Couldn't find path \"%s\": %s", path, fdt_strerror(offset));
memset(buf, POISON, sizeof(buf)); /* poison the buffer */
len = fdt_get_path(fdt, offset, buf, buflen);
if (buflen <= pathlen) {
if (len != -FDT_ERR_NOSPACE)
FAIL("fdt_get_path([%d bytes]) returns %d with "
"insufficient buffer space", buflen, len);
} else {
if (len < 0)
FAIL("fdt_get_path([%d bytes]): %s", buflen,
fdt_strerror(len));
if (len != pathlen)
FAIL("fdt_get_path([%d bytes]) reports length %d "
"instead of %d", buflen, len, pathlen);
if (strcmp(buf, path) != 0)
FAIL("fdt_get_path([%d bytes]) returns \"%s\" "
"instead of \"%s\"", buflen, buf, path);
}
if (buf[buflen] != POISON)
FAIL("fdt_get_path([%d bytes]) overran buffer", buflen);
}
void check_path(void *fdt, const char *path)
{
int pathlen = strlen(path);
check_path_buf(fdt, path, pathlen, 1024);
check_path_buf(fdt, path, pathlen, pathlen+1);
check_path_buf(fdt, path, pathlen, pathlen);
}
int main(int argc, char *argv[])
{
void *fdt;
test_init(argc, argv);
fdt = load_blob_arg(argc, argv);
check_path(fdt, "/");
check_path(fdt, "/subnode1");
check_path(fdt, "/subnode2");
check_path(fdt, "/subnode1/subsubnode");
check_path(fdt, "/subnode2/subsubnode");
PASS();
}