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 #if !defined(errno) && !defined(HAVE_ERRNO_DECL)
27 #define __set_errno(ev) ((errno) = (ev))
39 #define __environ environ
40 #ifndef HAVE_ENVIRON_DECL
41 extern char **environ;
44 /* LOCK and UNLOCK are defined as no-ops. This makes the libiberty
45 * implementation MT-Unsafe. */
49 /* Below this point, it's verbatim code from the glibc-2.0 implementation */
51 /* If this variable is not a null pointer we allocated the current
53 static char **last_environ;
57 setenv (name, value, replace)
64 const size_t namelen = strlen (name);
65 const size_t vallen = strlen (value) + 1;
70 if (__environ != NULL)
71 for (ep = __environ; *ep != NULL; ++ep)
72 if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
77 if (__environ == NULL || *ep == NULL)
80 if (__environ == last_environ && __environ != NULL)
81 /* We allocated this space; we can extend it. */
82 new_environ = (char **) realloc (last_environ,
83 (size + 2) * sizeof (char *));
85 new_environ = (char **) malloc ((size + 2) * sizeof (char *));
87 if (new_environ == NULL)
93 new_environ[size] = malloc (namelen + 1 + vallen);
94 if (new_environ[size] == NULL)
96 free ((char *) new_environ);
102 if (__environ != last_environ)
103 memcpy ((char *) new_environ, (char *) __environ,
104 size * sizeof (char *));
106 memcpy (new_environ[size], name, namelen);
107 new_environ[size][namelen] = '=';
108 memcpy (&new_environ[size][namelen + 1], value, vallen);
110 new_environ[size + 1] = NULL;
112 last_environ = __environ = new_environ;
116 size_t len = strlen (*ep);
117 if (len + 1 < namelen + 1 + vallen)
119 /* The existing string is too short; malloc a new one. */
120 char *new = malloc (namelen + 1 + vallen);
128 memcpy (*ep, name, namelen);
129 (*ep)[namelen] = '=';
130 memcpy (&(*ep)[namelen + 1], value, vallen);
142 const size_t len = strlen (name);
147 for (ep = __environ; *ep; ++ep)
148 if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
150 /* Found it. Remove this pointer by moving later ones back. */
155 /* Continue the loop in case NAME appears again. */