Added helper library for URL manipulation functions

master
Aadhavan Srinivasan 2 years ago
parent 1ec2fd1097
commit 7d3ef3a6c9

@ -0,0 +1,37 @@
#include <string.h>
#include <stdlib.h>
char* url_to_proto(char* url) {
size_t length = strlen(url);
int sentinel = 0;
char* to_return = malloc(sizeof(char) * 10);
for (int i=0;i<length;i++) {
if (*(url + (sizeof(char) * i)) == ':') { /* If the character is ':' ...*/
sentinel = i; /* ...Then we stop scanning the string */
}
}
strncpy(to_return,url,sentinel);
return to_return;
}
char* url_to_hostname(char* url) {
/* This function relies on a hack-y assumption: that, given a string
that represents a URL (e.g. https://www.example.com), the host portion
of the address is the length of the address minus (length of protocol + 3 ("://").
In this case that would be 23 - [5 (h,t,t,p,s) + 3 = 8]. */
size_t length = strlen(url);
char* protocol = url_to_proto(url);
char* to_return = malloc(sizeof(char) * 256);
/* This is a very roundabout way of saying that, starting from a certain point in the
URL (length of protocol string + 3), we are copying the rest of the string into another
substring. */
strncpy(to_return,url+(strlen(protocol) + 3),(length - (strlen(protocol) + 3)));
}

@ -0,0 +1,12 @@
#include <string.h>
/* url_to_proto - This takes in a URL, and returns the protocol.
Example - 'https://example.org' would return 'https'. */
char* url_to_proto(char* url);
/* url_to_hostname - This takes in a URL, and returns the hostname.
Example - 'https://example.org' would return 'example.org'. */
char* url_to_hostname(char* url);
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