pathcat.c revision 3f54fd611f536639ec30dd53c48e5ec1897cc7d9
/***********************************************************************
* *
* 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 Bell Laboratories
*
* single dir support for pathaccess()
*/
#define _AST_API_H 1
#include <ast.h>
/*
* building 3d flirts with the dark side
*/
#if _BLD_3d
#undef pathcat
#define pathcat_20100601 _3d_pathcat
#else
char*
pathcat(char* path, const char* dirs, int sep, const char* a, const char* b)
{
return pathcat_20100601(dirs, sep, a, b, path, PATH_MAX);
}
#endif
#undef _AST_API
#include <ast_api.h>
char*
pathcat_20100601(register const char* dirs, int sep, const char* a, register const char* b, char* path, size_t size)
{
register char* s;
register char* e;
s = path;
e = path + size;
while (*dirs && *dirs != sep)
{
if (s >= e)
return 0;
*s++ = *dirs++;
}
if (s != path)
{
if (s >= e)
return 0;
*s++ = '/';
}
if (a)
{
while (*s = *a++)
if (++s >= e)
return 0;
if (b)
{
if (s >= e)
return 0;
*s++ = '/';
}
}
else if (!b)
b = ".";
if (b)
do
{
if (s >= e)
return 0;
} while (*s++ = *b++);
return *dirs ? (char*)++dirs : 0;
}