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void undef (char *name)
{
        struct nlist *curr, *last;
        unsigned hashval;
 
        hashval = hash(name);
        last = curr = hashtab[hashval];
        while (curr != NULL && strcmp(name, curr->name)!= 0)
        {
                printf("while loop\n");
                last = curr;
                curr = curr->next;
                printf("last = %x, curr = %x\n", last, curr);
        }
 
        printf("after loop\n");
        if (curr == hashtab[hashval])
        {
                hashtab[hashval] = NULL;
                return;
        }
        if (curr)
        {
                last->next = curr->next;
                free ((void *) curr->name);
                free ((void *) curr->defn);
                free (curr);
        }
}
 

prog.c: In function 'undef':
prog.c:6:19: warning: implicit declaration of function 'hash' [-Wimplicit-function-declaration]
         hashval = hash(name);
                   ^
prog.c:7:23: error: 'hashtab' undeclared (first use in this function)
         last = curr = hashtab[hashval];
                       ^
prog.c:7:23: note: each undeclared identifier is reported only once for each function it appears in
prog.c:8:24: error: 'NULL' undeclared (first use in this function)
         while (curr != NULL && strcmp(name, curr->name)!= 0)
                        ^
prog.c:8:32: warning: implicit declaration of function 'strcmp' [-Wimplicit-function-declaration]
         while (curr != NULL && strcmp(name, curr->name)!= 0)
                                ^
prog.c:8:49: error: dereferencing pointer to incomplete type 'struct nlist'
         while (curr != NULL && strcmp(name, curr->name)!= 0)
                                                 ^
prog.c:10:17: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
                 printf("while loop\n");
                 ^
prog.c:10:17: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:10:17: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:13:24: warning: format '%x' expects argument of type 'unsigned int', but argument 2 has type 'struct nlist *' [-Wformat=]
                 printf("last = %x, curr = %x\n", last, curr);
                        ^
prog.c:13:24: warning: format '%x' expects argument of type 'unsigned int', but argument 3 has type 'struct nlist *' [-Wformat=]
prog.c:16:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("after loop\n");
         ^
prog.c:16:9: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:25:17: warning: implicit declaration of function 'free' [-Wimplicit-function-declaration]
                 free ((void *) curr->name);
                 ^
prog.c:25:17: warning: incompatible implicit declaration of built-in function 'free'
prog.c:25:17: note: include '<stdlib.h>' or provide a declaration of 'free'
prog.c:4:18: warning: variable 'hashval' set but not used [-Wunused-but-set-variable]
         unsigned hashval;
                  ^

Standard output is empty