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ext/zstd/programs/util.c  view on Meta::CPAN

        int ret;
        UTIL_TRACE_CALL("chmod");
        ret = chmod(filename, permissions);
        UTIL_TRACE_RET(ret);
        UTIL_TRACE_RET(ret);
        return ret;
    }
}

/* set access and modification times */
int UTIL_utime(const char* filename, const stat_t *statbuf)
{
    int ret;
    UTIL_TRACE_CALL("UTIL_utime(%s)", filename);
    /* We check that st_mtime is a macro here in order to give us confidence
     * that struct stat has a struct timespec st_mtim member. We need this
     * check because there are some platforms that claim to be POSIX 2008
     * compliant but which do not have st_mtim... */
#if (PLATFORM_POSIX_VERSION >= 200809L) && defined(st_mtime)
    {
        /* (atime, mtime) */
        struct timespec timebuf[2] = { {0, UTIME_NOW} };
        timebuf[1] = statbuf->st_mtim;
        ret = utimensat(AT_FDCWD, filename, timebuf, 0);
    }
#else
    {
        struct utimbuf timebuf;
        timebuf.actime = time(NULL);
        timebuf.modtime = statbuf->st_mtime;
        ret = utime(filename, &timebuf);
    }
#endif
    errno = 0;
    UTIL_TRACE_RET(ret);
    return ret;
}

int UTIL_setFileStat(const char *filename, const stat_t *statbuf)
{
    return UTIL_setFDStat(-1, filename, statbuf);
}

int UTIL_setFDStat(const int fd, const char *filename, const stat_t *statbuf)
{
    int res = 0;
    stat_t curStatBuf;
    UTIL_TRACE_CALL("UTIL_setFileStat(%d, %s)", fd, filename);

    if (!UTIL_fstat(fd, filename, &curStatBuf) || !UTIL_isRegularFileStat(&curStatBuf)) {
        UTIL_TRACE_RET(-1);
        return -1;
    }

    /* Mimic gzip's behavior:
     *
     * "Change the group first, then the permissions, then the owner.
     * That way, the permissions will be correct on systems that allow
     * users to give away files, without introducing a security hole.
     * Security depends on permissions not containing the setuid or
     * setgid bits." */

#if !defined(_WIN32)
#ifdef ZSTD_HAVE_FCHOWN
    if (fd >= 0) {
        res += fchown(fd, -1, statbuf->st_gid);  /* Apply group ownership */
    } else
#endif
    {
        res += chown(filename, -1, statbuf->st_gid);  /* Apply group ownership */
    }
#endif

    res += UTIL_fchmod(fd, filename, &curStatBuf, statbuf->st_mode & 0777);  /* Copy file permissions */

#if !defined(_WIN32)
#ifdef ZSTD_HAVE_FCHOWN
    if (fd >= 0) {
        res += fchown(fd, statbuf->st_uid, -1);  /* Apply user ownership */
    } else
#endif
    {
        res += chown(filename, statbuf->st_uid, -1);  /* Apply user ownership */
    }
#endif

    errno = 0;
    UTIL_TRACE_RET(-res);
    return -res; /* number of errors is returned */
}

int UTIL_isDirectory(const char* infilename)
{
    stat_t statbuf;
    int ret;
    UTIL_TRACE_CALL("UTIL_isDirectory(%s)", infilename);
    ret = UTIL_stat(infilename, &statbuf) && UTIL_isDirectoryStat(&statbuf);
    UTIL_TRACE_RET(ret);
    return ret;
}

int UTIL_isDirectoryStat(const stat_t* statbuf)
{
    int ret;
    UTIL_TRACE_CALL("UTIL_isDirectoryStat()");
#if defined(_MSC_VER)
    ret = (statbuf->st_mode & _S_IFDIR) != 0;
#else
    ret = S_ISDIR(statbuf->st_mode) != 0;
#endif
    UTIL_TRACE_RET(ret);
    return ret;
}

int UTIL_compareStr(const void *p1, const void *p2) {
    return strcmp(* (char * const *) p1, * (char * const *) p2);
}

int UTIL_isSameFile(const char* fName1, const char* fName2)
{
    int ret;
    assert(fName1 != NULL); assert(fName2 != NULL);
    UTIL_TRACE_CALL("UTIL_isSameFile(%s, %s)", fName1, fName2);
#if defined(_MSC_VER) || defined(_WIN32)
    /* note : Visual does not support file identification by inode.
     *        inode does not work on Windows, even with a posix layer, like msys2.
     *        The following work-around is limited to detecting exact name repetition only,
     *        aka `filename` is considered different from `subdir/../filename` */
    ret = !strcmp(fName1, fName2);
#else