Please explain each line of the codes. queue lab. c lang

/* 

 Attempt to insert element at head of queue. 

 Return true if successful. 

 Return false if q is NULL or could not allocate space. 

 Argument s points to the string to be stored. 

 The function must explicitly allocate space and copy the string into it. 

 */ 

bool q_insert_head(queue_t *q, char *s) 

{ 

 list_ele_t *newh; 

 /* What should you do if the q is NULL? */ 

 if(!q) 

 return false; 

 newh = malloc(sizeof(list_ele_t)); 

 if(!newh) 

 return false; 

 /* Don't forget to allocate space for the string and copy it */ 

 /* What if either call to malloc returns NULL? */ 

char *value; 

value = malloc(1 + strlen(s)); 

if(!value) 

{ 

if(newh) 

free(newh); 

return false; 

} 

strcpy(value, s); 

newh->value = value; 

 newh->next = q->head; 

if(q->head == NULL) 

q->tail = newh; 

 q->head = newh; 

q->cs += 1; 

 return true; 

 }