gethostbyname()

[jchanwh]

Please advise why the following code is not working(Segmentation fault). Merry Chirstmas!

#include <stdio.h>
#include <netdb.h>

main() {

struct hostent *h;
char *output1;
char *input;

fgets(input, strlen(input), stdin);
printf("%s", input);
h = gethostbyname(input);
sprintf(output1, "%u.%u.%u.%u", (unsigned char)h->h_addr[0], (unsigned char)h->h_addr[1], (unsigned char)h->h_addr[2], (unsigned cha
r)h->h_addr[3]);
printf("%s", output1);
}

[winbill]

>char *input;

>fgets(input, strlen(input), stdin);
// input is a char pointer,and u should allocate memory for it first

char input[1024];

fgets(input,sizeof(input),stdin);