1 /* Copyright (C) 1992, 1995, 1996, 1997 Free Software Foundation, Inc.
2 This file based on setenv.c in the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
26 #if !defined(errno) && !defined(HAVE_ERRNO_DECL)
29 #define __set_errno(ev) ((errno) = (ev))
41 #define __environ environ
42 #ifndef HAVE_ENVIRON_DECL
43 extern char **environ
;
46 /* LOCK and UNLOCK are defined as no-ops. This makes the libiberty
47 * implementation MT-Unsafe. */
51 /* Below this point, it's verbatim code from the glibc-2.0 implementation */
53 /* If this variable is not a null pointer we allocated the current
55 static char **last_environ
;
59 setenv (name
, value
, replace
)
66 const size_t namelen
= strlen (name
);
67 const size_t vallen
= strlen (value
) + 1;
72 if (__environ
!= NULL
)
73 for (ep
= __environ
; *ep
!= NULL
; ++ep
)
74 if (!strncmp (*ep
, name
, namelen
) && (*ep
)[namelen
] == '=')
79 if (__environ
== NULL
|| *ep
== NULL
)
82 if (__environ
== last_environ
&& __environ
!= NULL
)
83 /* We allocated this space; we can extend it. */
84 new_environ
= (char **) realloc (last_environ
,
85 (size
+ 2) * sizeof (char *));
87 new_environ
= (char **) malloc ((size
+ 2) * sizeof (char *));
89 if (new_environ
== NULL
)
95 new_environ
[size
] = malloc (namelen
+ 1 + vallen
);
96 if (new_environ
[size
] == NULL
)
98 free ((char *) new_environ
);
104 if (__environ
!= last_environ
)
105 memcpy ((char *) new_environ
, (char *) __environ
,
106 size
* sizeof (char *));
108 memcpy (new_environ
[size
], name
, namelen
);
109 new_environ
[size
][namelen
] = '=';
110 memcpy (&new_environ
[size
][namelen
+ 1], value
, vallen
);
112 new_environ
[size
+ 1] = NULL
;
114 last_environ
= __environ
= new_environ
;
118 size_t len
= strlen (*ep
);
119 if (len
+ 1 < namelen
+ 1 + vallen
)
121 /* The existing string is too short; malloc a new one. */
122 char *new = malloc (namelen
+ 1 + vallen
);
130 memcpy (*ep
, name
, namelen
);
131 (*ep
)[namelen
] = '=';
132 memcpy (&(*ep
)[namelen
+ 1], value
, vallen
);
144 const size_t len
= strlen (name
);
149 for (ep
= __environ
; *ep
; ++ep
)
150 if (!strncmp (*ep
, name
, len
) && (*ep
)[len
] == '=')
152 /* Found it. Remove this pointer by moving later ones back. */
157 /* Continue the loop in case NAME appears again. */