143 lines
3.8 KiB
C
143 lines
3.8 KiB
C
static char sccsid[] = "@(#)96 1.2 src/bos/usr/lib/sendmail/setenv.c, cmdsend, bos411, 9428A410j 6/15/90 23:25:58";
|
|
/*
|
|
* COMPONENT_NAME: CMDSEND setenv.c
|
|
*
|
|
* FUNCTIONS: _findenv, setenv, unsetenv
|
|
*
|
|
* ORIGINS: 10 26 27
|
|
*
|
|
* (C) COPYRIGHT International Business Machines Corp. 1985, 1989
|
|
* All Rights Reserved
|
|
* Licensed Materials - Property of IBM
|
|
*
|
|
* US Government Users Restricted Rights - Use, duplication or
|
|
* disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
|
|
*
|
|
* Copyright (c) 1987 Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms are permitted
|
|
* provided that the above copyright notice and this paragraph are
|
|
* duplicated in all such forms and that any documentation,
|
|
* advertising materials, and other materials related to such
|
|
* distribution and use acknowledge that the software was developed
|
|
* by the University of California, Berkeley. The name of the
|
|
* University may not be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*
|
|
* @(#)setenv.c 5.2 (Berkeley) 6/27/88
|
|
*
|
|
*/
|
|
|
|
|
|
#include <sys/types.h>
|
|
#include <stdio.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.
|
|
*/
|
|
static char *
|
|
_findenv(name, offset)
|
|
register char *name;
|
|
int *offset;
|
|
{
|
|
extern char **environ;
|
|
register int len;
|
|
register char **P, *C;
|
|
|
|
for (C = name, len = 0; *C && *C != '='; ++C, ++len);
|
|
for (P = environ; *P; ++P)
|
|
if (!strncmp(*P, name, len))
|
|
if (*(C = *P + len) == '=') {
|
|
*offset = P - environ;
|
|
return(++C);
|
|
}
|
|
return(NULL);
|
|
}
|
|
|
|
|
|
/*
|
|
* setenv --
|
|
* Set the value of the environmental variable "name" to be
|
|
* "value". If rewrite is set, replace any current value.
|
|
*/
|
|
setenv(name, value, rewrite)
|
|
register char *name, *value;
|
|
int rewrite;
|
|
{
|
|
extern char **environ;
|
|
static int alloced; /* if allocated space before */
|
|
register char *C;
|
|
int l_value, offset;
|
|
char *malloc(), *realloc(), *_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 */
|
|
environ = (char **)realloc((char *)environ,
|
|
(u_int)(sizeof(char *) * (cnt + 2)));
|
|
if (!environ)
|
|
return(-1);
|
|
}
|
|
else { /* get new space */
|
|
alloced = 1; /* copy old entries into it */
|
|
P = (char **)malloc((u_int)(sizeof(char *) *
|
|
(cnt + 2)));
|
|
if (!P)
|
|
return(-1);
|
|
bcopy(environ, P, cnt * sizeof(char *));
|
|
environ = P;
|
|
}
|
|
environ[cnt + 1] = NULL;
|
|
offset = cnt;
|
|
}
|
|
for (C = name; *C && *C != '='; ++C); /* no `=' in name */
|
|
if (!(environ[offset] = /* name + `=' + value */
|
|
malloc((u_int)((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)
|
|
char *name;
|
|
{
|
|
extern char **environ;
|
|
register char **P;
|
|
int offset;
|
|
|
|
while (_findenv(name, &offset)) /* if set multiple times */
|
|
for (P = &environ[offset];; ++P)
|
|
if (!(*P = *(P + 1)))
|
|
break;
|
|
}
|