rapida/c/response.c

/* SPDX-License-Identifier: GPL-3.0-or-later */
/* Copyright 2022 Ivan Polyakov */

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

static size_t calc_res_status_sz(const rpd_res *res);

static size_t calc_res_headers_sz(const rpd_keyval *res);

void rpd_res_init(rpd_res *dest)
{
    dest->status = rpd_res_st_ok;
    dest->body = NULL;
    rpd_keyval_init(&dest->headers, 5);
}

int rpd_res_headers_str(char **dest, const rpd_res *src)
{
    size_t size, i = 0;
    char *ptr;

    size = calc_res_headers_sz(&src->headers);

    *dest = (char *) malloc(sizeof(char) * size);
    if (!*dest) {
        perror("malloc");
        return 1;
    }

    ptr = *dest;
    while (i < src->headers.size) {
        ptr += sprintf(
            ptr,
            "%s: %s\r\n",
            src->headers.items[i].key,
            src->headers.items[i].val);
        i++;
    }

    return 0;
}

int rpd_res_str(char **dest, const rpd_res *res)
{
    size_t headers_size, size;
    char *ptr, *headers;
    size = headers_size = calc_res_headers_sz(&res->headers);
    size += calc_res_status_sz(res);

    if (res->body)
        size += 2 + strlen(res->body);

    *dest = (char *) malloc(sizeof(char) * size);
    if (!*dest) {
        perror("malloc");
        return 1;
    }

    /* header */
    ptr = *dest;
    ptr += sprintf(ptr, "Status: %d\r\n", res->status);

    if (rpd_res_headers_str(&headers, res)) {
        return 1;
    }

    memcpy(ptr, headers, headers_size);
    free(headers);
    ptr += headers_size;
    memcpy(ptr, "\r\n", 2);
    ptr += 2;

    /* body */
    if (res->body) {
        int bodylen = strlen(res->body);
        memcpy(ptr, res->body, bodylen);
        ptr += bodylen;
    }

    return 0;
}

static size_t calc_res_status_sz(const rpd_res *res)
{
    size_t size = 0;
    size += strlen("Status: \r\n");
    size += 3; /* plus status code */
    return size;
}

static size_t calc_res_headers_sz(const rpd_keyval *headers)
{
    size_t size = 0, i = 0;

    while (i < headers->size) {
        size += strlen(headers->items[i].key);
        size += 2; /* plus ": " */
        size += strlen(headers->items[i].val);
        size += 2; /* plus CRLF */
        i++;
    }

    return size;
}

void rpd_res_cleanup(rpd_res *res)
{
    res->status = rpd_res_st_ok;

    if (res->body) {
        free(res->body);
        res->body = NULL;
    }

    if (res->headers.capacity) {
        rpd_keyval_cleanup(&res->headers);
    }
}