const struct fdt_property *fdt_get_property_namelen(const void *fdt,
int nodeoffset,
const char *name,
int namelen, int *lenp)
{
uint32_t tag;
const struct fdt_property *prop;
int offset, nextoffset;
int err;
if (((err = fdt_check_header(fdt)) != 0)
|| ((err = _fdt_check_node_offset(fdt, nodeoffset)) < 0))
goto fail;
nextoffset = err;
do {
offset = nextoffset;
tag = fdt_next_tag(fdt, offset, &nextoffset);
switch (tag) {
case FDT_END:
if (nextoffset < 0)
err = nextoffset;
else
/* FDT_END tag with unclosed nodes */
err = -FDT_ERR_BADSTRUCTURE;
goto fail;
case FDT_PROP:
prop = _fdt_offset_ptr(fdt, offset);
if (_fdt_string_eq(fdt, fdt32_to_cpu(prop->nameoff),
name, namelen)) {
/* Found it! */
if (lenp)
*lenp = fdt32_to_cpu(prop->len);
return prop;
}
break;
}
} while ((tag != FDT_BEGIN_NODE) && (tag != FDT_END_NODE));
err = -FDT_ERR_NOTFOUND;
fail:
if (lenp)
*lenp = err;
return NULL;
}
/*
* chosen {
* bootargs="console=ttyS0,115200 ubi.mtd=4 root=ubi0:rootfs rootfstype=ubifs";
* };
* offset: node "/chosen"의 offset
* name: property "bootargs"
* namelen: property "bootargs" 길이
* lenp: property 내용의 길이
*/
const struct fdt_property *fdt_get_property_namelen(const void *fdt,
int offset,
const char *name,
int namelen, int *lenp)
{
/*
* node안의 property들을 순회하면서 찾고자 하는 name의 property 리턴
* 참고로 아래 for문에서 offset을 계속 받아오면서 값을 체크하고 있음
* 즉, 순회하면서 찾는 property가 없거나 탐색시 에러가 나면 탐색 중단
*/
for (offset = fdt_first_property_offset(fdt, offset);
(offset >= 0);
(offset = fdt_next_property_offset(fdt, offset))) {
const struct fdt_property *prop;
/*
* offset만큼 위치한 property에 접근해서
* lenp에 property의 value의 길이를 저장
* 하지만 에러가 나는 경우엔 for문을 빠져나감
*/
if (!(prop = fdt_get_property_by_offset(fdt, offset, lenp))) {
offset = -FDT_ERR_INTERNAL;
break;
}
/*
* 찾고자 하는 property가 맞는지 확인하고
* 맞다면 가져온 property 구조체를 리턴
*/
if (_fdt_string_eq(fdt, fdt32_to_cpu(prop->nameoff),
name, namelen))
return prop;
}
/*
* 찾는 property가 없는경우 or property 접근하다 에러가 난 경우
* lenp에 에러값 저장
*/
if (lenp)
*lenp = offset;
return NULL;
}
const struct fdt_property *fdt_get_property_namelen(const void *fdt,
int offset,
const char *name,
int namelen, int *lenp)
{
for (offset = fdt_first_property_offset(fdt, offset);
(offset >= 0); (offset = fdt_next_property_offset(fdt, offset))) {
const struct fdt_property *prop;
if (!(prop = fdt_get_property_by_offset(fdt, offset, lenp))) {
offset = -FDT_ERR_INTERNAL;
break;
}
if (_fdt_string_eq(fdt, fdt32_to_cpu(prop->nameoff),
name, namelen))
return prop;
}
if (lenp)
*lenp = offset;
return NULL;
}
const struct fdt_property *fdt_get_property_namelen(const void *fdt,
int nodeoffset,
const char *name,
int namelen, int *lenp)
{
uint32_t tag;
const struct fdt_property *prop;
int namestroff;
int offset, nextoffset;
int err;
if (((err = fdt_check_header(fdt)) != 0)
|| ((err = _fdt_check_node_offset(fdt, nodeoffset)) < 0))
goto fail;
nextoffset = err;
do {
offset = nextoffset;
tag = fdt_next_tag(fdt, offset, &nextoffset);
switch (tag) {
case FDT_END:
err = -FDT_ERR_TRUNCATED;
goto fail;
case FDT_BEGIN_NODE:
case FDT_END_NODE:
case FDT_NOP:
break;
case FDT_PROP:
err = -FDT_ERR_BADSTRUCTURE;
prop = fdt_offset_ptr(fdt, offset, sizeof(*prop));
if (! prop)
goto fail;
namestroff = fdt32_to_cpu(prop->nameoff);
if (_fdt_string_eq(fdt, namestroff, name, namelen)) {
/* Found it! */
int len = fdt32_to_cpu(prop->len);
prop = fdt_offset_ptr(fdt, offset,
sizeof(*prop)+len);
if (! prop)
goto fail;
if (lenp)
*lenp = len;
return prop;
}
break;
default:
err = -FDT_ERR_BADSTRUCTURE;
goto fail;
}
} while ((tag != FDT_BEGIN_NODE) && (tag != FDT_END_NODE));
err = -FDT_ERR_NOTFOUND;
fail:
if (lenp)
*lenp = err;
return NULL;
}
