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

/*	$OpenBSD: setenv.c,v 1.9 2005/08/08 08:05:37 espie Exp $ */
/*
 * 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. 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.
 */

/* OPENBSD ORIGINAL: lib/libc/stdlib/setenv.c */

#include "includes.h"
#if !defined(HAVE_SETENV) || !defined(HAVE_UNSETENV)

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

extern char **environ;

/* OpenSSH Portable: __findenv is from getenv.c rev 1.8, made static */
/*
 * __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.
 */
static char *
__findenv(const char *name, size_t *offset)
{
	extern char **environ;
	int len, i;
	const char *np;
	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);
}

#ifndef HAVE_SETENV
/*
 * setenv --
 *	Set the value of the environmental variable "name" to be
 *	"value".  If rewrite is set, replace any current value.
 */
int
setenv(const char *name, const char *value, int rewrite)
{
	static char **lastenv;			/* last value of environ */
	char *C;
	size_t l_value, offset;

	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 */
		size_t cnt;
		char **P;

		for (P = environ; *P != NULL; P++)
			;
		cnt = P - environ;
		P = (char **)realloc(lastenv, sizeof(char *) * (cnt + 2));
		if (!P)
			return (-1);
		if (lastenv != environ)
			memcpy(P, environ, cnt * sizeof(char *));
		lastenv = environ = P;
		offset = cnt;
		environ[cnt + 1] = NULL;
	}
	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);
}
#endif /* HAVE_SETENV */

#ifndef HAVE_UNSETENV
/*
 * unsetenv(name) --
 *	Delete environmental variable "name".
 */
void
unsetenv(const char *name)
{
	char **P;
	size_t offset;

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

#endif /* !defined(HAVE_SETENV) || !defined(HAVE_UNSETENV) */
Commit	Line	Data
b69585d9	1	/* $OpenBSD: setenv.c,v 1.9 2005/08/08 08:05:37 espie Exp $ */
f5238bee	2	/*
	3	* Copyright (c) 1987 Regents of the University of California.
	4	* All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
3e67f7df	14	* 3. Neither the name of the University nor the names of its contributors
f5238bee	15	* may be used to endorse or promote products derived from this software
	16	* without specific prior written permission.
	17	*
	18	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	19	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	20	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	21	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	22	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	23	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	24	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	25	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	26	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	27	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	28	* SUCH DAMAGE.
	29	*/
	30
f6d4fb87	31	/* OPENBSD ORIGINAL: lib/libc/stdlib/setenv.c */
f6d4fb87	32
17962c40	33	#include "includes.h"
351f44a0	34	#if !defined(HAVE_SETENV) \|\| !defined(HAVE_UNSETENV)
f5238bee	35
f5238bee	36	#include <stdlib.h>
	37	#include <string.h>
	38
b69585d9	39	extern char **environ;
e1658b5c	40
b69585d9	41	/* OpenSSH Portable: __findenv is from getenv.c rev 1.8, made static */
f5238bee	42	/*
	43	* __findenv --
	44	* Returns pointer to value associated with name, if any, else NULL.
	45	* Sets offset to be the offset of the name/value combination in the
	46	* environmental array, for use by setenv(3) and unsetenv(3).
	47	* Explicitly removes '=' in argument name.
f5238bee	48	*/
7b2dcf21	49	static char *
56f77432	50	__findenv(const char name, size_t offset)
f5238bee	51	{
f5238bee	52	extern char **environ;
e1658b5c	53	int len, i;
	54	const char *np;
	55	char *p, cp;
f5238bee	56
	57	if (name == NULL \|\| environ == NULL)
	58	return (NULL);
	59	for (np = name; np && np != '='; ++np)
	60	;
	61	len = np - name;
	62	for (p = environ; (cp = *p) != NULL; ++p) {
	63	for (np = name, i = len; i && *cp; i--)
	64	if (cp++ != np++)
	65	break;
	66	if (i == 0 && *cp++ == '=') {
	67	*offset = p - environ;
	68	return (cp);
	69	}
	70	}
	71	return (NULL);
	72	}
	73
351f44a0	74	#ifndef HAVE_SETENV
f5238bee	75	/*
	76	* setenv --
	77	* Set the value of the environmental variable "name" to be
	78	* "value". If rewrite is set, replace any current value.
	79	*/
	80	int
b69585d9	81	setenv(const char name, const char value, int rewrite)
f5238bee	82	{
b69585d9	83	static char *lastenv; / last value of environ */
b69585d9	84	char *C;
56f77432	85	size_t l_value, offset;
f5238bee	86
	87	if (value == '=') / no `=' in value */
	88	++value;
	89	l_value = strlen(value);
	90	if ((C = __findenv(name, &offset))) { /* find if already exists */
	91	if (!rewrite)
	92	return (0);
	93	if (strlen(C) >= l_value) { /* old larger; copy over */
1656cbed	94	while ((C++ = value++))
1656cbed	95	;
f5238bee	96	return (0);
	97	}
	98	} else { /* create new slot */
b69585d9	99	size_t cnt;
b69585d9	100	char **P;
f5238bee	101
b69585d9	102	for (P = environ; *P != NULL; P++)
	103	;
	104	cnt = P - environ;
	105	P = (char *)realloc(lastenv, sizeof(char ) * (cnt + 2));
	106	if (!P)
	107	return (-1);
	108	if (lastenv != environ)
	109	memcpy(P, environ, cnt * sizeof(char *));
	110	lastenv = environ = P;
f5238bee	111	offset = cnt;
b69585d9	112	environ[cnt + 1] = NULL;
f5238bee	113	}
b69585d9	114	for (C = (char )name; C && *C != '='; ++C)
b69585d9	115	; /* no `=' in name */
f5238bee	116	if (!(environ[offset] = /* name + `=' + value */
	117	malloc((size_t)((int)(C - name) + l_value + 2))))
	118	return (-1);
	119	for (C = environ[offset]; (C = name++) && *C != '='; ++C)
	120	;
	121	for (C++ = '='; (C++ = *value++); )
	122	;
	123	return (0);
	124	}
351f44a0	125	#endif /* HAVE_SETENV */
f5238bee	126
351f44a0	127	#ifndef HAVE_UNSETENV
f5238bee	128	/*
	129	* unsetenv(name) --
	130	* Delete environmental variable "name".
	131	*/
	132	void
b69585d9	133	unsetenv(const char *name)
f5238bee	134	{
b69585d9	135	char **P;
56f77432	136	size_t offset;
f5238bee	137
b69585d9	138	while (__findenv(name, &offset)) /* if set multiple times */
f5238bee	139	for (P = &environ[offset];; ++P)
	140	if (!(P = (P + 1)))
	141	break;
	142	}
351f44a0	143	#endif /* HAVE_UNSETENV */
f5238bee	144
351f44a0	145	#endif /* !defined(HAVE_SETENV) \|\| !defined(HAVE_UNSETENV) */