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struid.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2005 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                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
/*
 * 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, Dthash);
      }
      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;
}

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