request.c

#include "request.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

/*
 * Frees a request struct and every header node it owns.
 * Calling with NULL is a no-op.
 */
void request_free(request *req) {
    if (req == NULL) {
        return;
    }

    free(req->method);
    free(req->uri);
    free(req->httpversion);

    request_header *h = req->headers;
    while (h != NULL) {
        request_header *next = h->next;
        free(h->key);
        free(h->value);
        free(h);
        h = next;
    }

    free(req);
}

/*
 * Returns the value of the "Expect" header, or NO_CONTINUE if absent.
 * Previously crashed when headers was NULL.
 */
int find_expect(request **current_request) {
    if (current_request == NULL || *current_request == NULL) {
        return NO_CONTINUE;
    }

    request_header *header = (*current_request)->headers;
    while (header != NULL) {
        if (strcmp(header->key, "Expect") == 0) {
            if (strcmp(header->value, "100-continue") == 0) {
                return CONTINUE;
            }
            return NO_CONTINUE;
        }
        header = header->next;
    }

    return NO_CONTINUE;
}

/*
 * Returns the value string of the "Content-Length" header, or NULL if absent.
 * Previously crashed when headers was NULL, and returned a misleading
 * non-NULL string on the not-found path which callers could not distinguish
 * from a real value.
 */
char *find_content_len(request **current_request) {
    if (current_request == NULL || *current_request == NULL) {
        return NULL;
    }

    request_header *header = (*current_request)->headers;
    while (header != NULL) {
        if (strcmp(header->key, "Content-Length") == 0) {
            return header->value;
        }
        header = header->next;
    }

    return NULL;
}