/**
* find the matched mount point from a given full absolute path.
*
* \param[in] path full path
* \return the length of mount point.
*/
int uffs_GetMatchedMountPointSize(const char *path)
{
int pos;
uffs_Device *dev;
if (path[0] != '/')
return 0;
pos = strlen(path);
while (pos > 0) {
if ((dev = uffs_GetDeviceFromMountPointEx(path, pos)) != NULL ) {
uffs_PutDevice(dev);
return pos;
}
else {
if (path[pos-1] == '/')
pos--;
//back forward search the next '/'
for (; pos > 0 && path[pos-1] != '/'; pos--)
;
}
}
return pos;
}
/**
* Parse the full path name, initialize obj.
*
* \param[out] obj object to be initialize.
* \param[in] name full path name.
*
* \return U_SUCC if the name is parsed correctly,
* U_FAIL if failed, and obj->err is set.
*
* \note the following fields in obj will be initialized:
* obj->dev
* obj->parent
* obj->name
* obj->name_len
*/
URET uffs_ParseObject(uffs_Object *obj, const char *name)
{
int len, m_len, d_len;
uffs_Device *dev;
const char *start, *p, *dname;
u16 dir;
TreeNode *node;
u16 sum;
if (uffs_ReInitObject(obj) == U_FAIL)
return U_FAIL;
len = strlen(name);
m_len = uffs_GetMatchedMountPointSize(name);
dev = uffs_GetDeviceFromMountPointEx(name, m_len);
if (dev) {
start = name + m_len;
d_len = GetDirLengthFromPath(start, len - m_len);
p = start;
obj->dev = dev;
if (m_len == len) {
obj->parent = PARENT_OF_ROOT;
obj->name = NULL;
obj->name_len = 0;
}
else {
dir = ROOT_DIR_SERIAL;
dname = start;
while (p - start < d_len) {
while (*p != '/') p++;
sum = uffs_MakeSum16(dname, p - dname);
node = uffs_TreeFindDirNodeByName(dev, dname, p - dname, sum, dir);
if (node == NULL) {
obj->err = UENOENT;
break;
}
else {
dir = node->u.dir.serial;
p++; // skip the '/'
dname = p;
}
}
obj->parent = dir;
obj->name = start + (d_len > 0 ? d_len + 1 : 0);
obj->name_len = len - (d_len > 0 ? d_len + 1 : 0) - m_len;
}
if (obj->err != UENOERR) {
uffs_PutDevice(obj->dev);
obj->dev = NULL;
}
}
else {
obj->err = UENOENT;
}
return (obj->err == UENOERR ? U_SUCC : U_FAIL);
}
