/* getenv.c: the getenv() function

Portions of this software are Copyright 1995 by Randall Atkinson and Dan
McDonald, All Rights Reserved. All Rights under this copyright are assigned
to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and
License Agreement applies to this software.

	History:

	Modified at NRL for OPIE 2.0.
	Originally from BSD.
*/
/*
 * Copyright (c) 1987 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getenv.c	5.5 (Berkeley) 6/27/88";

#endif	/* LIBC_SCCS and not lint */

#include <stdio.h>

#include "opie_cfg.h"

#ifdef NEED_GETENV
/*
 * getenv --
 *      Returns ptr to value associated with name, if any, else NULL.
 */
char *
     getenv(name)
char *name;
{
  int offset;
  char *_findenv();

  return (_findenv(name, &offset));
}

#endif	/* NEED_GETENV */

#if defined(NEED_GETENV) || defined(NEED_SETENV)
/*
 * _findenv --
 *      Returns pointer to value associated with name, if any, else NULL.
 *      Sets offset to be the offset of the name/value combination in the
 *      environmental array, for use by setenv(3) and unsetenv(3).
 *      Explicitly removes '=' in argument name.
 *
 *      This routine *should* be a static; don't use it.
 */
char *
     _findenv(name, offset)
register char *name;
int *offset;
{
  extern char **environ;
  register int len;
  register char **P, *C;

  for (C = name, len = 0; *C && *C != '='; ++C, ++len);
  for (P = environ; *P; ++P)
    if (!strncmp(*P, name, len))
      if (*(C = *P + len) == '=') {
	*offset = P - environ;
	return (++C);
      }
  return (NULL);
}

#endif	/* defined(NEED_GETENV) || defined(NEED_SETENV) */
