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  1. /*
  2. FUNCTION
  3. <<getenv>>---look up environment variable
  4.  
  5. INDEX
  6.         getenv
  7. INDEX
  8.         environ
  9.  
  10. ANSI_SYNOPSIS
  11.         #include <stdlib.h>
  12.         char *getenv(const char *<[name]>);
  13.  
  14. TRAD_SYNOPSIS
  15.         #include <stdlib.h>
  16.         char *getenv(<[name]>)
  17.         char *<[name]>;
  18.  
  19. DESCRIPTION
  20. <<getenv>> searches the list of environment variable names and values
  21. (using the global pointer ``<<char **environ>>'') for a variable whose
  22. name matches the string at <[name]>.  If a variable name matches,
  23. <<getenv>> returns a pointer to the associated value.
  24.  
  25. RETURNS
  26. A pointer to the (string) value of the environment variable, or
  27. <<NULL>> if there is no such environment variable.
  28.  
  29. PORTABILITY
  30. <<getenv>> is ANSI, but the rules for properly forming names of environment
  31. variables vary from one system to another.
  32.  
  33. <<getenv>> requires a global pointer <<environ>>.
  34. */
  35.  
  36. /*
  37.  * Copyright (c) 1987, 2000 Regents of the University of California.
  38.  * All rights reserved.
  39.  *
  40.  * Redistribution and use in source and binary forms are permitted
  41.  * provided that: (1) source distributions retain this entire copyright
  42.  * notice and comment, and (2) distributions including binaries display
  43.  * the following acknowledgement:  ``This product includes software
  44.  * developed by the University of California, Berkeley and its contributors''
  45.  * in the documentation or other materials provided with the distribution
  46.  * and in all advertising materials mentioning features or use of this
  47.  * software. Neither the name of the University nor the names of its
  48.  * contributors may be used to endorse or promote products derived
  49.  * from this software without specific prior written permission.
  50.  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  51.  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  52.  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  53.  */
  54.  
  55. #ifndef _REENT_ONLY
  56.  
  57. #include <stdlib.h>
  58. #include <stddef.h>
  59. #include <string.h>
  60.  
  61. /*
  62.  * _findenv --
  63.  *      Returns pointer to value associated with name, if any, else NULL.
  64.  *      Sets offset to be the offset of the name/value combination in the
  65.  *      environmental array, for use by setenv(3) and unsetenv(3).
  66.  *      Explicitly removes '=' in argument name.
  67.  *
  68.  *      This routine *should* be a static; don't use it.
  69.  */
  70.  
  71. char *
  72. _DEFUN (_findenv, (name, offset),
  73.         register _CONST char *name _AND
  74.         int *offset)
  75. {
  76.   return NULL; //_findenv_r (_REENT, name, offset);
  77. }
  78.  
  79. /*
  80.  * getenv --
  81.  *      Returns ptr to value associated with name, if any, else NULL.
  82.  */
  83.  
  84. char *
  85. _DEFUN (getenv, (name),
  86.         _CONST char *name)
  87. {
  88.   int offset;
  89.  
  90.   return NULL; //_findenv_r (_REENT, name, &offset);
  91. }
  92.  
  93. #endif /* !_REENT_ONLY */
  94.