git.saurik.com Git - apple/libc.git/blame_incremental

... / ...

Commit	Line	Data
	1	/*
	2	* Copyright (c) 1987, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#if defined(LIBC_SCCS) && !defined(lint)
	35	static char sccsid[] = "@(#)getenv.c 8.1 (Berkeley) 6/4/93";
	36	#endif /* LIBC_SCCS and not lint */
	37	#include <sys/cdefs.h>
	38	__FBSDID("$FreeBSD: src/lib/libc/stdlib/getenv.c,v 1.4 2002/03/21 22:48:41 obrien Exp $");
	39
	40	#include <stdlib.h>
	41	#include <stddef.h>
	42	#include <string.h>
	43	#include <crt_externs.h>
	44
	45	__private_extern__ char __findenv(const char , int , char *);
	46
	47	/*
	48	* __findenv --
	49	* Returns pointer to value associated with name, if any, else NULL.
	50	* Sets offset to be the offset of the name/value combination in the
	51	* environmental array, for use by setenv(3) and unsetenv(3).
	52	* Explicitly removes '=' in argument name.
	53	*
	54	* This routine should be a static; don't use it.
	55	*/
	56	__private_extern__ char *
	57	__findenv(name, offset, environ)
	58	const char *name;
	59	int *offset;
	60	char **environ;
	61	{
	62	int len, i;
	63	const char *np;
	64	char *p, cp;
	65
	66	if (name == NULL \|\| environ == NULL)
	67	return (NULL);
	68	for (np = name; np && np != '='; ++np)
	69	continue;
	70	len = np - name;
	71	for (p = environ; (cp = *p) != NULL; ++p) {
	72	for (np = name, i = len; i && *cp; i--)
	73	if (cp++ != np++)
	74	break;
	75	if (i == 0 && *cp++ == '=') {
	76	*offset = p - environ;
	77	return (cp);
	78	}
	79	}
	80	return (NULL);
	81	}
	82
	83	/*
	84	* _getenvp -- SPI using an arbitrary pointer to string array (the array must
	85	* have been created with malloc) and an env state, created by _allocenvstate().
	86	* Returns ptr to value associated with name, if any, else NULL.
	87	*/
	88	char *
	89	_getenvp(const char name, char *envp, void state __unused)
	90	{
	91	int offset;
	92
	93	return (__findenv(name, &offset, *envp));
	94	}
	95
	96	/*
	97	* getenv --
	98	* Returns ptr to value associated with name, if any, else NULL.
	99	*/
	100	char *
	101	getenv(name)
	102	const char *name;
	103	{
	104	int offset;
	105
	106	return (__findenv(name, &offset, *_NSGetEnviron()));
	107	}