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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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66
libfdt/fdt_ro.c
View file

@ -283,3 +283,69 @@ const void *fdt_getprop(const void *fdt, int nodeoffset,
return prop->data;
}
int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen)
{
uint32_t tag;
int p = 0, overflow = 0;
int offset, nextoffset, namelen;
const char *name;
CHECK_HEADER(fdt);
tag = _fdt_next_tag(fdt, 0, &nextoffset);
if (tag != FDT_BEGIN_NODE)
return -FDT_ERR_BADSTRUCTURE;
if (buflen < 2)
return -FDT_ERR_NOSPACE;
buf[0] = '/';
p = 1;
while (offset < nodeoffset) {
offset = nextoffset;
tag = _fdt_next_tag(fdt, offset, &nextoffset);
switch (tag) {
case FDT_END:
return -FDT_ERR_BADOFFSET;
case FDT_BEGIN_NODE:
name = fdt_get_name(fdt, offset, &namelen);
if (!name)
return namelen;
if (overflow || ((p + namelen + 1) > buflen)) {
overflow++;
break;
}
memcpy(buf + p, name, namelen);
p += namelen;
buf[p++] = '/';
break;
case FDT_END_NODE:
if (overflow) {
overflow--;
break;
}
do {
p--;
} while (buf[p-1] != '/');
break;
case FDT_PROP:
case FDT_NOP:
break;
default:
return -FDT_ERR_BADSTRUCTURE;
}
}
if (overflow)
return -FDT_ERR_NOSPACE;
if (p > 1) /* special case so that root path is "/", not "" */
p--;
buf[p] = '\0';
return p;
}

2
libfdt/libfdt.h
View file

@ -136,6 +136,8 @@ static inline void *fdt_getprop_w(void *fdt, int nodeoffset,
return (void *)fdt_getprop(fdt, nodeoffset, name, lenp);
}
int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen);
/* Write-in-place functions */
int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
const void *val, int len);