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#include <stdlib.h>
#include <string.h>
#include "url.h"
#define SET_STR(segment) \
(segment) = malloc(i - start + 1); \
strncpy((segment), s + start, i - start);
#define MOVE(amount) \
i += (amount); \
start = i;
#define SET_AT_END(segment) \
if (cur == '\0') { \
state = END; \
if (i - 1 > start) { \
SET_STR(segment); \
} \
}
enum state { SCHEME, HOST, PORT, PATH, QUERY, FRAGMENT, END };
int parse_url(struct url *url, char *s) {
int i = 0; // index into *s
int start = 0; // index of current mode start
enum state state = SCHEME;
char cur;
while (i < MAX_URL_LENGTH) {
cur = s[i];
if (cur == ' ')
return INVALID_CHARACTER;
switch (state) {
case SCHEME:
if (cur == ':') {
state = HOST;
SET_STR(url->scheme);
MOVE(3); // skip the '://'
}
SET_AT_END(url->scheme);
break;
case HOST:
if (cur == ':') {
state = PORT;
SET_STR(url->host);
MOVE(1);
}
if (cur == '/') {
state = PATH;
SET_STR(url->host);
MOVE(0);
}
SET_AT_END(url->host);
break;
case PORT:
if (cur == '/') {
state = PATH;
char *port;
SET_STR(port);
url->port = atoi(port);
MOVE(0);
}
if (cur == '\0') {
state = END;
char *port;
SET_STR(port);
url->port = atoi(port);
}
break;
case PATH:
if (cur == '?') {
state = QUERY;
SET_STR(url->path);
MOVE(0);
}
if (cur == '#') {
state = FRAGMENT;
SET_STR(url->path);
MOVE(0);
}
SET_AT_END(url->path);
break;
case QUERY:
if (cur == '#') {
state = FRAGMENT;
SET_STR(url->query);
MOVE(0);
}
SET_AT_END(url->query);
break;
case FRAGMENT:
if (cur == '\0') {
state = END;
SET_STR(url->fragment);
MOVE(0);
}
break;
case END:
break;
}
i++;
if (cur == '\0')
break;
if (state == END)
break;
}
if (url->host == NULL)
return MISSING_HOST;
if (url->port == 0)
return MISSING_PORT;
if (url->path == NULL) {
url->path = malloc(2);
strcpy(url->path, "/");
}
return 0;
}
struct url *init_url(void) {
struct url *url = malloc(sizeof(struct url));
url->scheme = NULL;
url->host = NULL;
url->port = 2693;
url->path = NULL;
url->query = NULL;
url->fragment = NULL;
return url;
}
void free_url(struct url *url) {
free(url->scheme);
free(url->host);
free(url->path);
free(url->fragment);
free(url->query);
free(url);
}
int len_url(struct url *url) {
int len = 0;
len += url->scheme != NULL ? strlen(url->scheme) : 0;
len += url->host != NULL ? strlen(url->host) : 0;
len += sizeof(url->port);
len += url->path != NULL ? strlen(url->path) : 0;
len += url->query != NULL ? strlen(url->query) : 0;
len += url->fragment != NULL ? strlen(url->fragment) : 0;
return len;
}
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