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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libast/path/pathgetlink.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1985-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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/*

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* Glenn Fowler

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* AT&T Bell Laboratories

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*/

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#include "univlib.h"

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#ifdef UNIV_MAX

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#include <ctype.h>

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#endif

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/*

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 * return external representation for symbolic link text of name in buf

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 * the link text string length is returned

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 */

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int

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pathgetlink(const char* name, char* buf, int siz)

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{

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	int	n;

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	if ((n = readlink(name, buf, siz)) < 0) return(-1);

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	if (n >= siz)

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	{

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		errno = EINVAL;

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		return(-1);

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	}

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	buf[n] = 0;

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#ifdef UNIV_MAX

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	if (isspace(*buf))

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	{

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		register char*	s;

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		register char*	t;

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		register char*	u;

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		register char*	v;

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		int		match = 0;

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		char		tmp[PATH_MAX];

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		s = buf;

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		t = tmp;

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		while (isalnum(*++s) || *s == '_' || *s == '.');

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		if (*s++)

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		{

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			for (;;)

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			{

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				if (!*s || isspace(*s))

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				{

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					if (match)

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					{

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						*t = 0;

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						n = t - tmp;

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						strcpy(buf, tmp);

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					}

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					break;

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				}

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				if (t >= &tmp[sizeof(tmp)]) break;

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				*t++ = *s++;

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				if (!match && t < &tmp[sizeof(tmp) - univ_size + 1]) for (n = 0; n < UNIV_MAX; n++)

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				{

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					if (*(v = s - 1) == *(u = univ_name[n]))

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					{

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						while (*u && *v++ == *u) u++;

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						if (!*u)

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						{

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							match = 1;

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							strcpy(t - 1, univ_cond);

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							t += univ_size - 1;

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							s = v;

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							break;

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						}

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					}

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				}

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			}

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		}

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	}

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#endif

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	return(n);

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}

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