libc/unistd/getlogin.c

   1 /*
   2  * getlogin for uClibc
   3  * Copyright (C) 2000-2006 by Erik Andersen <andersen@uclibc.org>
   4  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   5  */
   6
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <unistd.h>
  10 #include <stdio.h>
  11
  12
  13 /* uClibc makes it policy to not mess with the utmp file whenever
  14  * possible, since I consider utmp a complete waste of time.  Since
  15  * getlogin() should never be used for security purposes, we kindly let
  16  * the user specify whatever they want via the LOGNAME environment
  17  * variable, or we return NULL if getenv() fails to find anything */
  18
  19 char * getlogin(void)
  20 {
  21         return (getenv("LOGNAME"));
  22 }
  23 libc_hidden_def(getlogin)
  24
  25 int getlogin_r(char *name, size_t len)
  26 {
  27         char * foo = getenv("LOGNAME");
  28
  29         if (! foo)
  30                 return -1;
  31
  32         strncpy(name, foo, len);
  33         name[len-1] = '\0';
  34         return 0;
  35 }
  36
  37 char *cuserid(char *s)
  38 {
  39         char *name = getlogin();
  40         if (s) {
  41                 return(strcpy(s, name ? name : ""));
  42         }
  43         return name;
  44 }