/*

 * Copyright (c) 2015 DeNA Co., Ltd., Kazuho Oku

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to

 * deal in the Software without restriction, including without limitation the

 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

 * sell copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

 * IN THE SOFTWARE.

 */

#include <errno.h>

#include <fcntl.h>

#include <stdint.h>

#include <stdlib.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <sys/uio.h>

#include <unistd.h>

#include "h2o/file.h"

h2o_iovec_t h2o_file_read(const char *fn)

{

    int fd;

    struct stat st;

    h2o_iovec_t ret = {NULL};

    /* open */

    if ((fd = open(fn, O_RDONLY | O_CLOEXEC)) == -1)

        goto Error;

    if (fstat(fd, &st))

        goto Error;

    /* allocate memory */

    if (st.st_size > SIZE_MAX) {

        errno = ENOMEM;

        goto Error;

    }

    if ((ret.base = malloc((size_t)st.st_size)) == NULL)

        goto Error;

    /* read */

    while (ret.len != (size_t)st.st_size) {

        ssize_t r;

        while ((r = read(fd, ret.base + ret.len, (size_t)st.st_size - ret.len)) == -1 && errno == EINTR)

            ;

        if (r <= 0)

            goto Error;

        ret.len += r;

    }

    /* close */

    close(fd);

    return ret;

Error:

    if (fd != -1)

        close(fd);

    free(ret.base);

    return (h2o_iovec_t){NULL};

}

int h2o_file_mktemp(const char *fn_template)

{

    int fd;

    char *tmpfn = alloca(strlen(fn_template) + 1);

    strcpy(tmpfn, fn_template);

    if ((fd = mkstemp(tmpfn)) == -1) {

        return -1;

    }

    unlink(tmpfn);

    return fd;

}