setenv.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* 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
* 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 "includes.h"
#ifndef HAVE_SETENV
#endif /* LIBC_SCCS and not lint */
#include <stdlib.h>
#include <string.h>
/*
* __findenv --
* Returns pointer to value associated with name, if any, else NULL.
* 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 *
register const char *name;
int *offset;
{
extern char **environ;
register int len, i;
register const char *np;
register char **p, *cp;
return (NULL);
;
break;
if (i == 0 && *cp++ == '=') {
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
register const char *name;
register const char *value;
int rewrite;
{
extern char **environ;
static int alloced; /* if allocated space before */
register char *C;
char *__findenv();
++value;
if (!rewrite)
return (0);
while ((*C++ = *value++))
;
return (0);
}
} else { /* create new slot */
register int cnt;
register char **P;
if (alloced) { /* just increase size */
if (!P)
return (-1);
environ = P;
}
else { /* get new space */
(cnt + 2)));
if (!P)
return (-1);
environ = P;
}
}
return (-1);
/* LINTED */
;
for (*C++ = '='; (*C++ = *value++); )
;
return (0);
}
/*
* unsetenv(name) --
* Delete environmental variable "name".
*/
void
const char *name;
{
extern char **environ;
register char **P;
int offset;
char *__findenv();
/* LINTED */
if (!(*P = *(P + 1)))
break;
}
#endif /* HAVE_SETENV */
#pragma ident "%Z%%M% %I% %E% SMI"