[gssapi-openssh.git] / openssh / openbsd-compat / setenv.c

/*
 * Copyright (c) 1987 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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.
 */

#include "config.h"
#ifndef HAVE_SETENV

#if defined(LIBC_SCCS) && !defined(lint)
static char *rcsid = "$OpenBSD: setenv.c,v 1.4 2001/07/09 06:57:45 deraadt Exp $";
#endif /* LIBC_SCCS and not lint */

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

/*
 * __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 const char *name;
	int *offset;
{
	extern char **environ;
	register int len, i;
	register const char *np;
	register char **p, *cp;

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

/*
 * setenv --
 *	Set the value of the environmental variable "name" to be
 *	"value".  If rewrite is set, replace any current value.
 */
int
setenv(name, value, rewrite)
	register const char *name;
	register const char *value;
	int rewrite;
{
	extern char **environ;
	static int alloced;			/* if allocated space before */
	register char *C;
	int l_value, offset;
	char *__findenv();

	if (*value == '=')			/* no `=' in value */
		++value;
	l_value = strlen(value);
	if ((C = __findenv(name, &offset))) {	/* find if already exists */
		if (!rewrite)
			return (0);
		if (strlen(C) >= l_value) {	/* old larger; copy over */
			while ((*C++ = *value++))
				;
			return (0);
		}
	} else {					/* create new slot */
		register int	cnt;
		register char	**P;

		for (P = environ, cnt = 0; *P; ++P, ++cnt);
		if (alloced) {			/* just increase size */
			P = (char **)realloc((void *)environ,
			    (size_t)(sizeof(char *) * (cnt + 2)));
			if (!P)
				return (-1);
			environ = P;
		}
		else {				/* get new space */
			alloced = 1;		/* copy old entries into it */
			P = (char **)malloc((size_t)(sizeof(char *) *
			    (cnt + 2)));
			if (!P)
				return (-1);
			memmove(P, environ, cnt * sizeof(char *));
			environ = P;
		}
		environ[cnt + 1] = NULL;
		offset = cnt;
	}
	for (C = (char *)name; *C && *C != '='; ++C);	/* no `=' in name */
	if (!(environ[offset] =			/* name + `=' + value */
	    malloc((size_t)((int)(C - name) + l_value + 2))))
		return (-1);
	for (C = environ[offset]; (*C = *name++) && *C != '='; ++C)
		;
	for (*C++ = '='; (*C++ = *value++); )
		;
	return (0);
}

/*
 * unsetenv(name) --
 *	Delete environmental variable "name".
 */
void
unsetenv(name)
	const char	*name;
{
	extern char **environ;
	register char **P;
	int offset;
	char *__findenv();

	while (__findenv(name, &offset))		/* if set multiple times */
		for (P = &environ[offset];; ++P)
			if (!(*P = *(P + 1)))
				break;
}

#endif /* HAVE_SETENV */
Commit	Line	Data
3c0ef626	1	/*
	2	* Copyright (c) 1987 Regents of the University of California.
	3	* 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	#include "config.h"
	35	#ifndef HAVE_SETENV
	36
	37	#if defined(LIBC_SCCS) && !defined(lint)
e9a17296	38	static char *rcsid = "$OpenBSD: setenv.c,v 1.4 2001/07/09 06:57:45 deraadt Exp $";
3c0ef626	39	#endif /* LIBC_SCCS and not lint */
	40
	41	#include <stdlib.h>
	42	#include <string.h>
	43
	44	/*
	45	* __findenv --
	46	* Returns pointer to value associated with name, if any, else NULL.
	47	* Sets offset to be the offset of the name/value combination in the
	48	* environmental array, for use by setenv(3) and unsetenv(3).
	49	* Explicitly removes '=' in argument name.
	50	*
	51	* This routine should be a static; don't use it.
	52	*/
	53	char *
	54	__findenv(name, offset)
	55	register const char *name;
	56	int *offset;
	57	{
	58	extern char **environ;
	59	register int len, i;
	60	register const char *np;
	61	register char *p, cp;
	62
	63	if (name == NULL \|\| environ == NULL)
	64	return (NULL);
	65	for (np = name; np && np != '='; ++np)
	66	;
	67	len = np - name;
	68	for (p = environ; (cp = *p) != NULL; ++p) {
	69	for (np = name, i = len; i && *cp; i--)
	70	if (cp++ != np++)
	71	break;
	72	if (i == 0 && *cp++ == '=') {
	73	*offset = p - environ;
	74	return (cp);
	75	}
	76	}
	77	return (NULL);
	78	}
	79
	80	/*
	81	* setenv --
	82	* Set the value of the environmental variable "name" to be
	83	* "value". If rewrite is set, replace any current value.
	84	*/
	85	int
	86	setenv(name, value, rewrite)
	87	register const char *name;
	88	register const char *value;
	89	int rewrite;
	90	{
	91	extern char **environ;
	92	static int alloced; /* if allocated space before */
	93	register char *C;
	94	int l_value, offset;
	95	char *__findenv();
	96
	97	if (value == '=') / no `=' in value */
	98	++value;
	99	l_value = strlen(value);
	100	if ((C = __findenv(name, &offset))) { /* find if already exists */
	101	if (!rewrite)
	102	return (0);
103	if (strlen(C) >= l_value) { /* old larger; copy over */
e9a17296	104	while ((C++ = value++))
e9a17296	105	;
3c0ef626	106	return (0);
	107	}
	108	} else { /* create new slot */
	109	register int cnt;
	110	register char **P;
	111
	112	for (P = environ, cnt = 0; *P; ++P, ++cnt);
	113	if (alloced) { /* just increase size */
	114	P = (char *)realloc((void )environ,
	115	(size_t)(sizeof(char ) (cnt + 2)));
	116	if (!P)
	117	return (-1);
	118	environ = P;
	119	}
	120	else { /* get new space */
	121	alloced = 1; /* copy old entries into it */
	122	P = (char *)malloc((size_t)(sizeof(char ) *
	123	(cnt + 2)));
	124	if (!P)
	125	return (-1);
	126	memmove(P, environ, cnt * sizeof(char *));
	127	environ = P;
	128	}
	129	environ[cnt + 1] = NULL;
	130	offset = cnt;
	131	}
	132	for (C = (char )name; C && C != '='; ++C); / no `=' in name */
	133	if (!(environ[offset] = /* name + `=' + value */
	134	malloc((size_t)((int)(C - name) + l_value + 2))))
	135	return (-1);
	136	for (C = environ[offset]; (C = name++) && *C != '='; ++C)
	137	;
	138	for (C++ = '='; (C++ = *value++); )
	139	;
	140	return (0);
	141	}
	142
	143	/*
	144	* unsetenv(name) --
	145	* Delete environmental variable "name".
	146	*/
	147	void
	148	unsetenv(name)
	149	const char *name;
	150	{
	151	extern char **environ;
	152	register char **P;
	153	int offset;
	154	char *__findenv();
	155
	156	while (__findenv(name, &offset)) /* if set multiple times */
	157	for (P = &environ[offset];; ++P)
	158	if (!(P = (P + 1)))
	159	break;
	160	}
	161
	162	#endif /* HAVE_SETENV */