question about function strcmp() in C

[thungmail]

There is partial code in C

typedef struct message {
    int messageId;
    char *messageText;
    struct message *next;
}message;
.....
.....
.....
/* Get a node before a node */
message *nodeBefore ( message *text ) {
    message *tem;
    tem = head;
    /* If there are only 2 nodes ( a and b ),then nodeBeforeByText of a is returning to a */
 184:if ( strcmp(tem->messageText,text) == 0)
           return tem;
       else {
           while ( tem  != NULL ) {        
 188:         if ( strcmp(tem->next->messageText,text) == 0 )            
                    break;        
             else
                    tem = tem->next;
          }
       }
       return tem;   
}
 

When I compiled there were messages :

q2.c:184: warning: passing arg 2 of `strcmp' from incompatible pointer type
q2.c:188: warning: passing arg 2 of `strcmp' from incompatible pointer type
 

After looking up the reference for strcmp() in library, I still dont understand why there are messages here.Can some body explain to me.

[Laharl]

text is a message*, a pointer to a message (the struct type), not a string, a char*, which is what strcmp expects.

[thungmail]

text is a message*, a pointer to a message (the struct type), not a string, a char*, which is what strcmp expects.

Yeah Thanks. I got it now