int nval_get(const char *xb, int xb_size, const YCHAR *name, char *buf, int bsize)
{
int pos = nval_find(xb,xb_size,name,NULL);
int size;
if(pos >= 0 && pos< xb_size){
memcpy(&size,xb +pos,sizeof(int));
pos+=sizeof(int); /* advance past record length */
size -= sizeof(int);
/* Advance over name string */
while(xb[pos] && size > 0 && pos < xb_size){
pos++;
size--;
}
/*Advance over NUL */
pos++;
size--;
if(size <= bsize){
memcpy(buf,xb + pos,size);
return size;
}
}
if(pos >= 0)
return -ERANGE;
else
return -ENODATA;
}
int nval_del(char *xb, int xb_size, const YCHAR *name)
{
int pos = nval_find(xb, xb_size, name, NULL);
int size;
if(pos >= 0 && pos < xb_size){
/* Find size, shift rest over this record, then zero out the rest of buffer */
memcpy(&size,xb+pos,sizeof(int));
memcpy(xb + pos, xb + pos + size, xb_size - (pos + size));
memset(xb + (xb_size - size),0,size);
return 0;
} else
return -ENODATA;
}
int nval_set(char *xb, int xb_size, const YCHAR * name, const char *buf,
int bsize, int flags)
{
int pos;
int namelen = strnlen(name, xb_size);
int reclen;
int size_exist = 0;
int space;
int start;
pos = nval_find(xb, xb_size, name, &size_exist);
if (flags & XATTR_CREATE && pos >= 0)
return -EEXIST;
if (flags & XATTR_REPLACE && pos < 0)
return -ENODATA;
start = nval_used(xb, xb_size);
space = xb_size - start + size_exist;
reclen = (sizeof(int) + namelen + 1 + bsize);
if (reclen > space)
return -ENOSPC;
if (pos >= 0) {
nval_del(xb, xb_size, name);
start = nval_used(xb, xb_size);
}
pos = start;
memcpy(xb + pos, &reclen, sizeof(int));
pos += sizeof(int);
strncpy((YCHAR *) (xb + pos), name, reclen);
pos += (namelen + 1);
memcpy(xb + pos, buf, bsize);
return 0;
}
