96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/* Copyright (C) 1991 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
/* Hacked slightly by jjc@jclark.com for groff. */
|
|
|
|
#include <string.h>
|
|
|
|
#ifdef __STDC__
|
|
#include <stddef.h>
|
|
typedef void *PTR;
|
|
typedef size_t SIZE_T;
|
|
#else /* not __STDC__ */
|
|
typedef char *PTR;
|
|
typedef int SIZE_T;
|
|
#endif /* not __STDC__ */
|
|
|
|
#ifdef HAVE_STDLIB_H
|
|
#include <stdlib.h>
|
|
#else /* not HAVE_STDLIB_H */
|
|
PTR malloc();
|
|
#endif /* not HAVE_STDLIB_H */
|
|
|
|
#ifndef NULL
|
|
#define NULL 0
|
|
#endif
|
|
|
|
extern char **environ;
|
|
|
|
/* Put STRING, which is of the form "NAME=VALUE", in the environment. */
|
|
|
|
int putenv(const char *string)
|
|
{
|
|
char *name_end = strchr(string, '=');
|
|
SIZE_T size;
|
|
char **ep;
|
|
|
|
if (name_end == NULL)
|
|
{
|
|
/* Remove the variable from the environment. */
|
|
size = strlen(string);
|
|
for (ep = environ; *ep != NULL; ++ep)
|
|
if (!strncmp(*ep, string, size) && (*ep)[size] == '=')
|
|
{
|
|
while (ep[1] != NULL)
|
|
{
|
|
ep[0] = ep[1];
|
|
++ep;
|
|
}
|
|
*ep = NULL;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
size = 0;
|
|
for (ep = environ; *ep != NULL; ++ep)
|
|
if (!strncmp(*ep, string, name_end - string)
|
|
&& (*ep)[name_end - string] == '=')
|
|
break;
|
|
else
|
|
++size;
|
|
|
|
if (*ep == NULL)
|
|
{
|
|
static char **last_environ = NULL;
|
|
char **new_environ = (char **) malloc((size + 2) * sizeof(char *));
|
|
if (new_environ == NULL)
|
|
return -1;
|
|
(void) memcpy((PTR) new_environ, (PTR) environ, size * sizeof(char *));
|
|
new_environ[size] = (char *) string;
|
|
new_environ[size + 1] = NULL;
|
|
if (last_environ != NULL)
|
|
free((PTR) last_environ);
|
|
last_environ = new_environ;
|
|
environ = new_environ;
|
|
}
|
|
else
|
|
*ep = (char *) string;
|
|
|
|
return 0;
|
|
}
|