resolvepath.c revision 34f9b3eef6fdadbda0a846aa4d68691ac40eace5
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2009 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* 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
/*
* resolvepath implementation
*/
#define resolvepath ______resolvepath
#include <ast.h>
#include <error.h>
#undef resolvepath
#undef _def_map_ast
#include <ast_map.h>
#if defined(__EXPORT__)
#define extern __EXPORT__
#endif
extern int
resolvepath(const char* file, char* path, size_t size)
{
register char* s;
register int n;
register int r;
r = *file != '/';
n = strlen(file) + r + 1;
if (n >= size)
{
#ifdef ENAMETOOLONG
errno = ENAMETOOLONG;
#else
errno = ENOMEM;
#endif
return 0;
}
if (!r)
s = path;
else if (!getcwd(path, size - n))
return 0;
else
{
s = path + strlen(path);
*s++ = '/';
}
strcpy(s, file);
return pathcanon(path, PATH_PHYSICAL|PATH_DOTDOT|PATH_EXISTS) ? strlen(path) : -1;
}