pwd/getpwuid.c

   1 /* Copyright (C) 1991 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <stddef.h>
  21 #include <stdio.h>
  22 #include <pwd.h>
  23 #include <sys/types.h>
  24
  25 /* Search for an entry with a matching uid.  */
  26 struct passwd *
  27 DEFUN(getpwuid, (uid), register uid_t uid)
  28 {
  29   static PTR info;
  30   register FILE *stream;
  31   register struct passwd *p;
  32
  33   if (info == NULL)
  34     {
  35       info = __pwdalloc();
  36       if (info == NULL)
  37         return(NULL);
  38     }
  39
  40   stream = __pwdopen();
  41   if (stream == NULL)
  42     return(NULL);
  43
  44   while ((p = __pwdread(stream, info)) != NULL)
  45     if (p->pw_uid == uid)
  46       break;
  47
  48   (void) fclose(stream);
  49   return(p);
  50 }