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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2011 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> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* Glenn Fowler
* AT&T Research
*
* ftwalk on top of fts
*/
#include <ast.h>
#include <ftwalk.h>
static struct
{
int (*comparf)(Ftw_t*, Ftw_t*);
} state;
/*
* why does fts take FTSENT** instead of FTSENT*
*/
static int
ftscompare(Ftw_t* const* pf1, Ftw_t* const* pf2)
{
return (*state.comparf)(*pf1, *pf2);
}
/*
* the real thing -- well it used to be
*/
int
ftwalk(const char* path, int (*userf)(Ftw_t*), int flags, int (*comparf)(Ftw_t*, Ftw_t*))
{
register FTS* f;
register FTSENT* e;
register int children;
register int rv;
int oi;
int ns;
int os;
int nd;
FTSENT* x;
FTSENT* dd[2];
flags ^= FTS_ONEPATH;
if (flags & FTW_TWICE)
flags &= ~(FTS_NOPREORDER|FTS_NOPOSTORDER);
else if (flags & FTW_POST)
flags |= FTS_NOPREORDER;
else
flags |= FTS_NOPOSTORDER;
if (children = flags & FTW_CHILDREN)
flags |= FTS_SEEDOT;
state.comparf = comparf;
if (!(f = fts_open((char* const*)path, flags, comparf ? ftscompare : 0)))
{
if (!path || !(flags & FTS_ONEPATH) && !(path = (const char*)(*((char**)path))))
return -1;
ns = strlen(path) + 1;
if (!(e = newof(0, FTSENT, 1, ns)))
return -1;
e->fts_accpath = e->fts_name = e->fts_path = strcpy((char*)(e + 1), path);
e->fts_namelen = e->fts_pathlen = ns;
e->fts_info = FTS_NS;
e->parent = e;
e->parent->link = e;
rv = (*userf)((Ftw_t*)e);
free(e);
return rv;
}
rv = 0;
if (children && (e = fts_children(f, 0)))
{
nd = 0;
for (x = e; x; x = x->link)
if (x->info & FTS_DD)
{
x->statb = *x->fts_statp;
x->info &= ~FTS_DD;
dd[nd++] = x;
if (nd >= elementsof(dd))
break;
}
e->parent->link = e;
rv = (*userf)((Ftw_t*)e->parent);
e->parent->link = 0;
while (nd > 0)
dd[--nd]->info |= FTS_DD;
for (x = e; x; x = x->link)
if (!(x->info & FTS_D))
x->status = FTS_SKIP;
}
while (!rv && (e = fts_read(f)))
{
oi = e->info;
os = e->status;
ns = e->status = e->path == e->fts_accpath ? FTW_PATH : FTW_NAME;
nd = 0;
switch (e->info)
{
case FTS_D:
case FTS_DNX:
if (children)
for (x = fts_children(f, 0); x; x = x->link)
if (x->info & FTS_DD)
{
x->statb = *x->fts_statp;
x->info &= ~FTS_DD;
dd[nd++] = x;
if (nd >= elementsof(dd))
break;
}
break;
case FTS_DOT:
continue;
case FTS_ERR:
e->info = FTS_NS;
break;
case FTS_NSOK:
e->info = FTS_NSOK;
break;
case FTS_SLNONE:
e->info = FTS_SL;
break;
}
rv = (*userf)((Ftw_t*)e);
e->info = oi;
if (e->status == ns)
e->status = os;
while (nd > 0)
dd[--nd]->info |= FTS_DD;
}
fts_close(f);
return rv;
}
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