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. */
24 #include <sys/types.h> /* For `size_t' */
25 #include <stdio.h> /* For `NULL' */
28 #if !defined(errno) && !defined(HAVE_ERRNO_DECL)
31 #define __set_errno(ev) ((errno) = (ev))
43 #define __environ environ
44 #ifndef HAVE_ENVIRON_DECL
45 extern char **environ
;
48 /* LOCK and UNLOCK are defined as no-ops. This makes the libiberty
49 * implementation MT-Unsafe. */
53 /* Below this point, it's verbatim code from the glibc-2.0 implementation */
55 /* If this variable is not a null pointer we allocated the current
57 static char **last_environ
;
61 setenv (name
, value
, replace
)
68 const size_t namelen
= strlen (name
);
69 const size_t vallen
= strlen (value
) + 1;
74 if (__environ
!= NULL
)
75 for (ep
= __environ
; *ep
!= NULL
; ++ep
)
76 if (!strncmp (*ep
, name
, namelen
) && (*ep
)[namelen
] == '=')
81 if (__environ
== NULL
|| *ep
== NULL
)
84 if (__environ
== last_environ
&& __environ
!= NULL
)
85 /* We allocated this space; we can extend it. */
86 new_environ
= (char **) realloc (last_environ
,
87 (size
+ 2) * sizeof (char *));
89 new_environ
= (char **) malloc ((size
+ 2) * sizeof (char *));
91 if (new_environ
== NULL
)
97 new_environ
[size
] = malloc (namelen
+ 1 + vallen
);
98 if (new_environ
[size
] == NULL
)
100 free ((char *) new_environ
);
101 __set_errno (ENOMEM
);
106 if (__environ
!= last_environ
)
107 memcpy ((char *) new_environ
, (char *) __environ
,
108 size
* sizeof (char *));
110 memcpy (new_environ
[size
], name
, namelen
);
111 new_environ
[size
][namelen
] = '=';
112 memcpy (&new_environ
[size
][namelen
+ 1], value
, vallen
);
114 new_environ
[size
+ 1] = NULL
;
116 last_environ
= __environ
= new_environ
;
120 size_t len
= strlen (*ep
);
121 if (len
+ 1 < namelen
+ 1 + vallen
)
123 /* The existing string is too short; malloc a new one. */
124 char *new = malloc (namelen
+ 1 + vallen
);
132 memcpy (*ep
, name
, namelen
);
133 (*ep
)[namelen
] = '=';
134 memcpy (&(*ep
)[namelen
+ 1], value
, vallen
);
146 const size_t len
= strlen (name
);
151 for (ep
= __environ
; *ep
; ++ep
)
152 if (!strncmp (*ep
, name
, len
) && (*ep
)[len
] == '=')
154 /* Found it. Remove this pointer by moving later ones back. */
159 /* Continue the loop in case NAME appears again. */
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