pathgetlink.c revision 3e14f97f673e8a630f076077de35afdd43dc1587
9512fe850e98fdd448c638ca63fdd92a8a510255ahl/***********************************************************************
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* This software is part of the ast package *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* Copyright (c) 1985-2010 AT&T Intellectual Property *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* and is licensed under the *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* Common Public License, Version 1.0 *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* by AT&T Intellectual Property *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* A copy of the License is available at *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* http://www.opensource.org/licenses/cpl1.0.txt *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* Information and Software Systems Research *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* AT&T Research *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* Florham Park NJ *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* Glenn Fowler <gsf@research.att.com> *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* David Korn <dgk@research.att.com> *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* Phong Vo <kpv@research.att.com> *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* *
9512fe850e98fdd448c638ca63fdd92a8a510255ahl***********************************************************************/
9512fe850e98fdd448c638ca63fdd92a8a510255ahl#pragma prototyped
9512fe850e98fdd448c638ca63fdd92a8a510255ahl/*
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* Glenn Fowler
9512fe850e98fdd448c638ca63fdd92a8a510255ahl* AT&T Bell Laboratories
9512fe850e98fdd448c638ca63fdd92a8a510255ahl*/
9512fe850e98fdd448c638ca63fdd92a8a510255ahl
9512fe850e98fdd448c638ca63fdd92a8a510255ahl#include "univlib.h"
9512fe850e98fdd448c638ca63fdd92a8a510255ahl
9512fe850e98fdd448c638ca63fdd92a8a510255ahl#ifdef UNIV_MAX
9512fe850e98fdd448c638ca63fdd92a8a510255ahl
9512fe850e98fdd448c638ca63fdd92a8a510255ahl#include <ctype.h>
9512fe850e98fdd448c638ca63fdd92a8a510255ahl
9512fe850e98fdd448c638ca63fdd92a8a510255ahl#endif
9512fe850e98fdd448c638ca63fdd92a8a510255ahl
9512fe850e98fdd448c638ca63fdd92a8a510255ahl/*
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * return external representation for symbolic link text of name in buf
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * the link text string length is returned
9512fe850e98fdd448c638ca63fdd92a8a510255ahl */
9512fe850e98fdd448c638ca63fdd92a8a510255ahl
9512fe850e98fdd448c638ca63fdd92a8a510255ahlint
9512fe850e98fdd448c638ca63fdd92a8a510255ahlpathgetlink(const char* name, char* buf, int siz)
9512fe850e98fdd448c638ca63fdd92a8a510255ahl{
9512fe850e98fdd448c638ca63fdd92a8a510255ahl int n;
9512fe850e98fdd448c638ca63fdd92a8a510255ahl
if ((n = readlink(name, buf, siz)) < 0) return(-1);
if (n >= siz)
{
errno = EINVAL;
return(-1);
}
buf[n] = 0;
#ifdef UNIV_MAX
if (isspace(*buf))
{
register char* s;
register char* t;
register char* u;
register char* v;
int match = 0;
char tmp[PATH_MAX];
s = buf;
t = tmp;
while (isalnum(*++s) || *s == '_' || *s == '.');
if (*s++)
{
for (;;)
{
if (!*s || isspace(*s))
{
if (match)
{
*t = 0;
n = t - tmp;
strcpy(buf, tmp);
}
break;
}
if (t >= &tmp[sizeof(tmp)]) break;
*t++ = *s++;
if (!match && t < &tmp[sizeof(tmp) - univ_size + 1]) for (n = 0; n < UNIV_MAX; n++)
{
if (*(v = s - 1) == *(u = univ_name[n]))
{
while (*u && *v++ == *u) u++;
if (!*u)
{
match = 1;
strcpy(t - 1, univ_cond);
t += univ_size - 1;
s = v;
break;
}
}
}
}
}
}
#endif
return(n);
}