/* This file is part of limb                           https://lila.oss/limb
 * Copyright (C) 2023 Olivier Brunel                          jjk@jjacky.com */
/* SPDX-License-Identifier: GPL-2.0-only */
#include <errno.h>
#include <limb/allreadwrite.h>
#include <limb/djbunix.h>

ssize_t
open_read_closeat(char *dst, size_t dlen, int bfd, const char *file)
{
    int fd = openb_readat(bfd, file);
    if (fd < 0) return -1;

    errno = 0;
    ssize_t r = allread(fd, dst, dlen);
    if (errno) goto err;

    if ((size_t) r == dlen) {
        char c;
        ssize_t rr = fd_read(fd, &c, 1);
        if (rr < 0) r = rr;
        else if (rr == 1) (errno = ENOBUFS, r = -1);
    }

err:
    fd_close(fd);
    return r;
}