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