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#include <stdlib.h>
#include <string.h>
#include "response.h"
#define SET_STR(segment) \
(segment) = malloc(i - start + 1); \
strncpy((segment), s + start, i - start);
#define MOVE(amount) \
i += (amount); \
start = i;
#define CHECK_AT_END() \
if (cur == '\0') { \
state = END; \
}
#define AT_DELIM (cur == '\t' && next == '\r' && next_next == '\n')
enum state {
STATUS,
MESSAGE,
MESSAGE_S,
TYPE_S,
TYPE,
LENGTH_S,
LENGTH,
HASH,
HASH_S,
CONTENT,
END
};
int parse_response(struct response *res, char *s) {
int i = 0;
int start = 0;
char cur;
char next;
char next_next;
int s_len = strlen(s);
enum state state = STATUS;
while (state != END) {
cur = s[i];
if (i < s_len)
next = s[i + 1];
if (i + 1 < s_len)
next_next = s[i + 2];
switch (state) {
case STATUS:
if (cur == '\r' && next == '\n') {
char *status_str;
SET_STR(status_str);
int status = atoi(status_str);
if (status > 0)
res->status = status;
else
return INVALID_STATUS;
free(status_str);
MOVE(2);
state = MESSAGE;
}
break;
case MESSAGE:
if (cur == ':') {
char *message_str;
SET_STR(message_str);
if (strncmp(message_str, "message", 7) != 0) {
MOVE(strlen(message_str) * -1);
state = TYPE;
break;
} else {
MOVE(1); // skip ':'
state = MESSAGE_S;
}
free(message_str);
}
break;
case MESSAGE_S:
if (AT_DELIM) {
char *message_str;
SET_STR(message_str);
res->message = message_str;
MOVE(3);
state = TYPE;
}
break;
case TYPE:
if (cur == ':') {
char *type_str;
SET_STR(type_str);
if (strncmp(type_str, "type", 4) != 0) {
MOVE(strlen(type_str) * -1);
state = LENGTH;
} else {
MOVE(1); // skip ':'
state = TYPE_S;
}
free(type_str);
}
break;
case TYPE_S:
if (cur == '/') {
SET_STR(res->type.type);
MOVE(1);
} else if (AT_DELIM) {
SET_STR(res->type.subtype);
MOVE(3);
state = LENGTH;
}
break;
case LENGTH:
if (cur == ':') {
char *length_str;
SET_STR(length_str);
if (strncmp(length_str, "length", 6) != 0) {
MOVE(strlen(length_str) * -1);
state = HASH;
} else {
MOVE(1); // skip ':'
state = LENGTH_S;
}
free(length_str);
}
case LENGTH_S:
if (AT_DELIM) {
char *length_str;
SET_STR(length_str);
res->length = atoi(length_str);
free(length_str);
MOVE(3);
state = HASH;
}
break;
case HASH:
if (cur == ':') {
char *hash_str;
SET_STR(hash_str);
if (strncmp(hash_str, "hash", 4) != 0) {
MOVE(strlen(hash_str) * -1);
free(hash_str);
return UNKNOWN_KEY;
} else {
MOVE(1); // skip ':'
state = HASH_S;
}
free(hash_str);
}
break;
case HASH_S:
if ((cur == '\r' && next == '\n') || AT_DELIM) {
char *hash_str;
SET_STR(hash_str);
res->hash = hash_str;
MOVE(4);
state = CONTENT;
}
case CONTENT:
if (res->length < 1) {
state = END;
break;
}
if (i == s_len - 1) {
char *content_str;
SET_STR(content_str);
res->content = content_str;
state = END;
}
case END:
break;
}
i++;
if (i == s_len) {
state = END;
}
}
return 0;
}
void free_response(struct response *res) {
free(res->message);
free(res->type.type);
free(res->type.subtype);
free(res->hash);
free(res->content);
}
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