libgloss/crx/_getenv.c

   1 /* _getenv.c -- Implementation of the low-level _getenv() routine
   2  *
   3  * Copyright (c) 2004 National Semiconductor Corporation
   4  *
   5  * The authors hereby grant permission to use, copy, modify, distribute,
   6  * and license this software and its documentation for any purpose, provided
   7  * that existing copyright notices are retained in all copies and that this
   8  * notice is included verbatim in any distributions. No written agreement,
   9  * license, or royalty fee is required for any of the authorized uses.
  10  * Modifications to this software may be copyrighted by their authors
  11  * and need not follow the licensing terms described here, provided that
  12  * the new terms are clearly indicated on the first page of each file where
  13  * they apply.
  14  */
  15
  16 #include <sys/syscall.h>
  17 #include <stdlib.h>
  18
  19 register char *R2 __asm__("r2");
  20 register char *R3 __asm__("r3");
  21
  22 char * _getenv (const char *name)
  23 {
  24   char *x;
  25   char *y;
  26
  27   x  = R2;
  28
  29   y  = (char *) calloc (256, 1);
  30   R3 = y;
  31
  32   R2 = x;
  33
  34   HOST_SERVICE (SVC_GETENV);
  35 }
  36