mirror of
https://github.com/coreutils/coreutils.git
synced 2024-11-26 11:23:47 +08:00
111 lines
2.8 KiB
C
111 lines
2.8 KiB
C
/* Copyright (C) 1991, 1994 Free Software Foundation, Inc.
|
|
|
|
|
|
NOTE: The canonical source of this file is maintained with the GNU C Library.
|
|
Bugs can be reported to bug-glibc@prep.ai.mit.edu.
|
|
|
|
This program is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by the
|
|
Free Software Foundation; either version 2, or (at your option) any
|
|
later version.
|
|
|
|
This program 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
#include <errno.h>
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
/* Define-away any (possibly conflicting) prototype of putenv.
|
|
Many systems omit the `const' attribute on the argument. */
|
|
#define putenv _sys_putenv
|
|
|
|
#if defined (__GNU_LIBRARY__) || defined (HAVE_STDLIB_H)
|
|
#include <stdlib.h>
|
|
#endif
|
|
#if defined (__GNU_LIBRARY__) || defined (HAVE_STRING_H)
|
|
#include <string.h>
|
|
#endif
|
|
#if defined (__GNU_LIBRARY__) || defined (HAVE_UNISTD_H)
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
#undef putenv
|
|
|
|
#if !defined (__GNU_LIBRARY__) && !defined (HAVE_STRCHR)
|
|
#define strchr index
|
|
#endif
|
|
#if !defined (__GNU_LIBRARY__) && !defined (HAVE_MEMCPY)
|
|
#define memcpy(d,s,n) bcopy ((s), (d), (n))
|
|
#endif
|
|
|
|
#if HAVE_GNU_LD
|
|
#define environ __environ
|
|
#else
|
|
extern char **environ;
|
|
#endif
|
|
|
|
|
|
/* Put STRING, which is of the form "NAME=VALUE", in the environment. */
|
|
int
|
|
putenv (string)
|
|
const char *string;
|
|
{
|
|
const char *const name_end = strchr (string, '=');
|
|
register size_t size;
|
|
register 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 ((void *) new_environ, (void *) environ,
|
|
size * sizeof (char *));
|
|
new_environ[size] = (char *) string;
|
|
new_environ[size + 1] = NULL;
|
|
if (last_environ != NULL)
|
|
free ((void *) last_environ);
|
|
last_environ = new_environ;
|
|
environ = new_environ;
|
|
}
|
|
else
|
|
*ep = (char *) string;
|
|
|
|
return 0;
|
|
}
|