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/* $NetBSD: setenv.c,v 1.1.1.1 2009/04/12 15:33:26 christos Exp $ */
#if defined(LIBC_SCCS) && !defined(lint)
static const char sccsid[] = "@(#)setenv.c 8.1 (Berkeley) 6/4/93";
static const char rcsid[] = "Id: setenv.c,v 1.2 2005/04/27 04:56:11 sra Exp";
#endif /* LIBC_SCCS and not lint */
/*
* 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.
* 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.
*/
/*
* Per the statement at http://opensource.org/licenses/bsd-license.php,
*
* The advertising clause in the license appearing on BSD Unix files was
* officially rescinded by the Director of the Office of Technology
* Licensing of the University of California on July 22 1999. He states
* that clause 3 is "hereby deleted in its entirety."
*
* I removed the advertising clause in the above copyright.
* The above web site points to
* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change.
*
* Arnold Robbins
* 7 September 2016
*/
/* #include "port_before.h" */
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
/* #include "port_after.h" */
#define NEED_SETENV
#if !defined(NEED_SETENV)
int __bindcompat_setenv;
#else
/*
* Gawk changes:
* 1. Comment out "port_before.h" and "port_after.h" includes.
* 2. Define NEED_SETENV.
* 3. Add leading "int" to setenv() for C99 compilers. Which is worse,
* that it wasn't there in the first place, or that C99 now makes
* such functions void, breaking 40+ years of historical practice?
* 4. Change return type of unsetenv to "int" for standards
* conformance and check for name containing an "=" in
* which case it return an error. (See unsetenv(3), at least on Linux.)
*/
extern char **environ;
static char *findenv(const char *name, int *offset);
/*%
* 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)
{
extern char **environ;
static int alloced; /*%< if allocated space before */
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 (strlen(c) >= l_value) { /*%< old larger; copy over */
while (*c++ = *value++);
return (0);
}
} else { /*%< create new slot */
int cnt;
char **p;
for (p = environ, cnt = 0; *p; ++p, ++cnt);
if (alloced) { /*%< just increase size */
environ = (char **)realloc((char *)environ,
(size_t)(sizeof(char *) * (cnt + 2)));
if (!environ)
return (-1);
}
else { /*%< get new space */
alloced = 1; /*%< copy old entries into it */
p = malloc((size_t)(sizeof(char *) * (cnt + 2)));
if (!p)
return (-1);
memcpy(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".
*/
int
unsetenv(const char *name)
{
char **p;
int offset;
if (strchr(name, '=') != NULL) {
errno = EINVAL;
return -1;
}
while (findenv(name, &offset)) /*%< if set multiple times */
for (p = &environ[offset];; ++p)
if (!(*p = *(p + 1)))
break;
return 0;
}
/*%
* 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.
*/
static char *
findenv(const char *name, int *offset)
{
const char *np;
char **p, *c;
int len;
if (name == NULL || environ == NULL)
return (NULL);
for (np = name; *np && *np != '='; ++np)
continue;
len = np - name;
for (p = environ; (c = *p) != NULL; ++p)
if (strncmp(c, name, len) == 0 && c[len] == '=') {
*offset = p - environ;
return (c + len + 1);
}
return (NULL);
}
#endif
/*! \file */
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