Inserting a node into a singly linked list

Nodeptrnp;
if ( (np = mknode(item)) != NULL) {
Nodeptrcurr = *list;
Nodeptrprev = NULL;

/* locate the position of this node in the list */
while (curr != NULL && item < curr->data) {
prev = curr;
curr = curr->next;
}
/* let this node point to the next node in the list */
np->next = curr;

/* let the previous node in the list point to this node */
if (prev != NULL)
prev->next = np;
else/* this node is the first in the list */
*list = np;