cmd/3d/link3d.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1989-2011 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                 Eclipse Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*          http://www.eclipse.org/org/documents/epl-v10.html           *
*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Eduardo Krell <ekrell@adexus.cl>                   *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include "3d.h"

#ifdef link3d

int
link3d(const char* path, const char* target)
{
    register char*  sp;
    register char*  tp;
    register int    r;
    char*       t;
    int     oerrno;
    char        buf[PATH_MAX+1];
#if FS
    char        tmp[PATH_MAX+1];
    Mount_t*    mp;
#endif

    if (state.in_2d)
        return(LINK(path, target));
#if FS
    if (!fscall(NiL, MSG_link, 0, path, target))
        return(state.ret);
    mp = monitored();
#endif
    if (!(sp = pathreal(path, state.safe ? (P_SAFE|P_TOP) : P_TOP, NiL)))
        return(-1);
    sp = strncpy(buf, sp, PATH_MAX);
    if (!(tp = pathreal(target, P_PATHONLY|P_NOOPAQUE|P_SAFE, NiL)))
        return(-1);
    oerrno = errno;
    if ((r = LINK(sp, tp)) && errno == ENOENT && (t = strrchr(tp, '/')))
    {
        *t = 0;
        r = fs3d_mkdir(tp, S_IRWXU|S_IRWXG|S_IRWXO);
        *t = '/';
        if (!r)
        {
            errno = oerrno;
            r = LINK(sp, tp);
        }
    }
#if FS
    if (!r)
    {
        if (mp && !LSTAT(tp, &state.path.st))
        {
            if (tp != tmp)
            {
                if (!(tp = pathreal(target, P_PATHONLY|P_NOOPAQUE|P_ABSOLUTE, NiL)))
                    return(r);
                tp = strncpy(tmp, tp, PATH_MAX);
            }
            fscall(mp, MSG_link, 0, sp, tp);
        }
        for (mp = state.global; mp; mp = mp->global)
            if (fssys(mp, MSG_link))
            {
                if (tp != tmp)
                {
                    if (!(tp = pathreal(target, P_PATHONLY|P_NOOPAQUE|P_ABSOLUTE, NiL)))
                        return(r);
                    tp = strncpy(tmp, tp, PATH_MAX);
                }
                fscall(mp, MSG_link, 0, sp, tp);
            }
    }
#endif
    return(r);
}

#else

NoN(link)

#endif