struid.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
*
* uid name -> number
*/
#if defined(__STDPP__directive) && defined(__STDPP__hide)
__STDPP__directive pragma pp:hide getpwnam getpwuid
#else
#define getpwnam ______getpwnam
#define getpwuid ______getpwuid
#endif
#include <ast.h>
#include <cdt.h>
#include <pwd.h>
#if defined(__STDPP__directive) && defined(__STDPP__hide)
__STDPP__directive pragma pp:nohide getpwnam getpwuid
#else
#undef getpwnam
#undef getpwuid
#endif
extern struct passwd* getpwnam(const char*);
extern struct passwd* getpwuid(uid_t);
typedef struct Id_s
{
Dtlink_t link;
int id;
char name[1];
} Id_t;
/*
* return uid number given uid name
* -1 on first error for a given name
* -2 on subsequent errors for a given name
*/
int
struid(const char* name)
{
register Id_t* ip;
register struct passwd* pw;
int id;
char* e;
static Dt_t* dict;
static Dtdisc_t disc;
if (!dict)
{
disc.key = offsetof(Id_t, name);
dict = dtopen(&disc, Dtset);
}
else if (ip = (Id_t*)dtmatch(dict, name))
return ip->id;
if (pw = getpwnam(name))
id = pw->pw_uid;
else
{
id = strtol(name, &e, 0);
#if _WINIX
if (!*e)
{
if (!getpwuid(id))
id = -1;
}
else if (streq(name, "root") && (pw = getpwnam("Administrator")))
id = pw->pw_uid;
else
id = -1;
#else
if (*e || !getpwuid(id))
id = -1;
#endif
}
if (dict && (ip = newof(0, Id_t, 1, strlen(name))))
{
strcpy(ip->name, name);
ip->id = id >= 0 ? id : -2;
dtinsert(dict, ip);
}
return id;
}