106 lines
3.2 KiB
C
106 lines
3.2 KiB
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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
char *__findenv(const char *name, int *offset);
|
||
|
|
|
||
|
|
extern char **environ;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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;
|
||
|
|
int 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 ((int)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);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* unsetenv(name) --
|
||
|
|
* Delete environmental variable "name".
|
||
|
|
*/
|
||
|
|
int
|
||
|
|
unsetenv(const char *name)
|
||
|
|
{
|
||
|
|
char **P;
|
||
|
|
int offset;
|
||
|
|
|
||
|
|
while (__findenv(name, &offset)) /* if set multiple times */
|
||
|
|
for (P = &environ[offset];; ++P)
|
||
|
|
if (!(*P = *(P + 1)))
|
||
|
|
break;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|