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/*
* fakeenv.c
*
* Originally written by Mark Eichin, Cygnus Support, 1992.
* Public Domain.
*
* setenv --
* Set the value of the environmental variable "name" to be
* "value". If rewrite is set, replace any current value.
*/
#include <stdlib.h>
#include <string.h>
setenv(name, value, rewrite)
register char *name, *value;
int rewrite;
{
char *combo = malloc(strlen(name)+strlen(value)+2);
strcpy(combo,name);
strcat(combo,"=");
strcat(combo,value);
putenv(combo);
}
/*
* 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.
*/
/*
* _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);
}
/*
* unsetenv(name) --
* Delete environmental variable "name".
*/
void
unsetenv(name)
char *name;
{
extern char **environ;
register char **P;
int offset;
char *_findenv();
while (_findenv(name, &offset)) /* if set multiple times */
for (P = &environ[offset];; ++P)
if (!(*P = *(P + 1)))
break;
}
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