Question

I have the following string: "http://www.google.ie/".I want to create a string "www.google.ie"

How do I do this in C? Here’s what I’ve tried so far:

char* url="http://www.google.ie/";
char* url_stripped=NULL;
char* out=strtok(url,"http://");
while(out){
    out=strtok(0,".");
    url_stripped=out;
    break;
}
printf("%s\n",url_stripped);

But it’s not working.I also fear that if I have a url containing ‘h’, ‘t’, ‘t’ or ‘p’, that things will get messed up.

I also need to be able to stip off “https://” from the beginning.

Answer 1

How about checking if the string starts with "http://" or "https://", and then skip seven or eight characters, then then search for the first '/'?

char *url="http://www.google.ie/";
char *tmp = url;
char *stripped_url;

if (strncmp(tmp, "http://", 7) == 0 || strncmp(tmp, "https://", 8) == 0)
    tmp += (tmp[4] == 's') ? 8 : 7;  /* Skip over the "http://" or "https://" */

char *slash = strchr(tmp, '/');
if (slash != NULL)
    stripped_url = strndup(tmp, slash - tmp);  /* slash-tmp is the length between start of the string and the slash */
else
    stripped_url = strdup(tmp);

printf("domain name = \"%s\"\n", strupped_url);

free(stripped_url);