2 * Copyright (c) 1987 Regents of the University of California.
5 * Redistribution and use in source and binary forms are permitted
6 * provided that the above copyright notice and this paragraph are
7 * duplicated in all such forms and that any documentation,
8 * advertising materials, and other materials related to such
9 * distribution and use acknowledge that the software was developed
10 * by the University of California, Berkeley. The name of the
11 * University may not be used to endorse or promote products derived
12 * from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static char sccsid[] = "@(#)setenv.c 5.2 (Berkeley) 6/27/88";
20 #endif /* LIBC_SCCS and not lint */
22 #include <sys/types.h>
27 * Returns pointer to value associated with name, if any, else NULL.
28 * Sets offset to be the offset of the name/value combination in the
29 * environmental array, for use by setenv(3) and unsetenv(3).
30 * Explicitly removes '=' in argument name.
36 _findenv(name, offset)
40 extern char **environ;
42 register char **P, *C;
44 for (C = name, len = 0; *C && *C != '='; ++C, ++len);
45 for (P = environ; *P; ++P)
46 if (!strncmp(*P, name, len))
47 if (*(C = *P + len) == '=') {
48 *offset = P - environ;
56 * Delete environmental variable "name".
62 extern char **environ;
66 while (_findenv(name, &offset)) /* if set multiple times */
67 for (P = &environ[offset];; ++P)