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[release] / src / liblimb / djbunix.h / sa_readlinkat.c 

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/* 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 <unistd.h>
#include <limb/djbunix.h>

int
sa_readlinkat(stralloc *sa, int fd, const char * restrict file)
{
    size_t len = 256;
    ssize_t r;
    for (;;) {
        if (!stralloc_readyplus(sa, len))
            return -1;
        r = readlinkat(fd, file, sa->s + sa->len, len);
        if (r < 0) return -1;
        if ((size_t) r < len)
            break;
        len += 256;
    }
    sa->len += r;
    return 0;
}