IABSD.fr/xenocara/app/xedit/lisp/getenv.c

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• Author : matthieu
  Date : 2013-01-14 22:05:51
  Hash : a5fd897e
  Message : update to xedit 1.2.1

• app/xedit/lisp/getenv.c

• /*	$OpenBSD: getenv.c,v 1.1 2013/01/14 22:05:52 matthieu Exp $ */
  /*
   * Copyright (c) 1987, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <stdlib.h>
  #include <string.h>
  
  char *__findenv(const char *name, int len, int *offset);
  
  /*
   * __findenv --
   *	Returns pointer to value associated with name, if any, else NULL.
   *	Starts searching within the environmental array at offset.
   *	Sets offset to be the offset of the name/value combination in the
   *	environmental array, for use by putenv(3), setenv(3) and unsetenv(3).
   *	Explicitly removes '=' in argument name.
   *
   *	This routine *should* be a static; don't use it.
   */
  char *
  __findenv(const char *name, int len, int *offset)
  {
  	extern char **environ;
  	int i;
  	const char *np;
  	char **p, *cp;
  
  	if (name == NULL || environ == NULL)
  		return (NULL);
  	for (p = environ + *offset; (cp = *p) != NULL; ++p) {
  		for (np = name, i = len; i && *cp; i--)
  			if (*cp++ != *np++)
  				break;
  		if (i == 0 && *cp++ == '=') {
  			*offset = p - environ;
  			return (cp);
  		}
  	}
  	return (NULL);
  }
  
  /*
   * getenv --
   *	Returns ptr to value associated with name, if any, else NULL.
   */
  char *
  getenv(const char *name)
  {
  	int offset = 0;
  	const char *np;
  
  	for (np = name; *np && *np != '='; ++np)
  		;
  	return (__findenv(name, (int)(np - name), &offset));
  }