[apple/libc.git] / stdlib / FreeBSD / getenv.c

/*
 * 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.
 * 4. 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getenv.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/stdlib/getenv.c,v 1.8 2007/05/01 16:02:41 ache Exp $");

#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <crt_externs.h>

__private_extern__ char *__findenv(const char *, int *, char **);

/*
 * __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.
 */
__private_extern__ char *
__findenv(name, offset, environ)
	const char *name;
	int *offset;
	char **environ;
{
	int len, i;
	const char *np;
	char **p, *cp;

	if (name == NULL || environ == NULL)
		return (NULL);
	for (np = name; *np && *np != '='; ++np)
		continue;
	len = np - name;
	for (p = environ; (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);
}

/*
 * _getenvp -- SPI using an arbitrary pointer to string array (the array must
 * have been created with malloc) and an env state, created by _allocenvstate().
 *	Returns ptr to value associated with name, if any, else NULL.
 */
char *
_getenvp(const char *name, char ***envp, void *state __unused)
{
	int offset;

	return (__findenv(name, &offset, *envp));
}

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

	return (__findenv(name, &offset, *_NSGetEnviron()));
}
Commit	Line	Data
e9ce8d39 A	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.
e9ce8d39 A	13	* 4. Neither the name of the University nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
9385eb3d A	30	#if defined(LIBC_SCCS) && !defined(lint)
	31	static char sccsid[] = "@(#)getenv.c 8.1 (Berkeley) 6/4/93";
	32	#endif /* LIBC_SCCS and not lint */
	33	#include <sys/cdefs.h>
1f2f436a	34	__FBSDID("$FreeBSD: src/lib/libc/stdlib/getenv.c,v 1.8 2007/05/01 16:02:41 ache Exp $");
e9ce8d39 A	35
	36	#include <stdlib.h>
	37	#include <stddef.h>
	38	#include <string.h>
ad3c9f2a	39	#include <crt_externs.h>
e9ce8d39	40
ad3c9f2a	41	__private_extern__ char __findenv(const char , int , char *);
e9ce8d39 A	42
	43	/*
	44	* __findenv --
	45	* Returns pointer to value associated with name, if any, else NULL.
	46	* Sets offset to be the offset of the name/value combination in the
	47	* environmental array, for use by setenv(3) and unsetenv(3).
	48	* Explicitly removes '=' in argument name.
	49	*
	50	* This routine should be a static; don't use it.
	51	*/
ad3c9f2a A	52	__private_extern__ char *
ad3c9f2a A	53	__findenv(name, offset, environ)
9385eb3d	54	const char *name;
e9ce8d39	55	int *offset;
ad3c9f2a	56	char **environ;
e9ce8d39	57	{
9385eb3d A	58	int len, i;
	59	const char *np;
	60	char *p, cp;
e9ce8d39 A	61
	62	if (name == NULL \|\| environ == NULL)
	63	return (NULL);
	64	for (np = name; np && np != '='; ++np)
	65	continue;
	66	len = np - name;
9385eb3d A	67	for (p = environ; (cp = *p) != NULL; ++p) {
	68	for (np = name, i = len; i && *cp; i--)
	69	if (cp++ != np++)
	70	break;
	71	if (i == 0 && *cp++ == '=') {
e9ce8d39	72	*offset = p - environ;
9385eb3d	73	return (cp);
e9ce8d39	74	}
9385eb3d	75	}
e9ce8d39 A	76	return (NULL);
e9ce8d39 A	77	}
9385eb3d	78
ad3c9f2a A	79	/*
	80	* _getenvp -- SPI using an arbitrary pointer to string array (the array must
	81	* have been created with malloc) and an env state, created by _allocenvstate().
	82	* Returns ptr to value associated with name, if any, else NULL.
	83	*/
	84	char *
	85	_getenvp(const char name, char *envp, void state __unused)
	86	{
	87	int offset;
	88
	89	return (__findenv(name, &offset, *envp));
	90	}
	91
9385eb3d A	92	/*
	93	* getenv --
	94	* Returns ptr to value associated with name, if any, else NULL.
	95	*/
	96	char *
	97	getenv(name)
	98	const char *name;
	99	{
	100	int offset;
	101
ad3c9f2a	102	return (__findenv(name, &offset, *_NSGetEnviron()));
9385eb3d	103	}