earlybrowserreborn - Blame information for rev 1

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1 roytam 1 /*
2  * Copyright (c) 1987 Regents of the University of California.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms are permitted
6  * provided that: (1) source distributions retain this entire copyright
7  * notice and comment, and (2) distributions including binaries display
8  * the following acknowledgement:  ``This product includes software
9  * developed by the University of California, Berkeley and its contributors''
10  * in the documentation or other materials provided with the distribution
11  * and in all advertising materials mentioning features or use of this
12  * software. Neither the name of the University nor the names of its
13  * contributors may be used to endorse or promote products derived
14  * from this software without specific prior written permission.
15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18  */
19  
20 #if defined(LIBC_SCCS) && !defined(lint)
21 static char sccsid[] = "@(#)getenv.c    5.7 (Berkeley) 6/1/90";
22 #endif /* LIBC_SCCS and not lint */
23  
24 #include <stdio.h>
25  
26 /*
27  * getenv --
28  *      Returns ptr to value associated with name, if any, else NULL.
29  */
30 char *
31 getenv(name)
32         char *name;
33 {
34         int offset;
35         char *_findenv();
36  
37         return(_findenv(name, &offset));
38 }
39  
40 /*
41  * _findenv --
42  *      Returns pointer to value associated with name, if any, else NULL.
43  *      Sets offset to be the offset of the name/value combination in the
44  *      environmental array, for use by setenv(3) and unsetenv(3).
45  *      Explicitly removes '=' in argument name.
46  *
47  *      This routine *should* be a static; don't use it.
48  */
49 char *
50 _findenv(name, offset)
51         register char *name;
52         int *offset;
53 {
54         extern char **environ;
55         register int len;
56         register char **P, *C;
57  
58         for (C = name, len = 0; *C && *C != '='; ++C, ++len);
59         for (P = environ; *P; ++P)
60                 if (!strncmp(*P, name, len))
61                         if (*(C = *P + len) == '=') {
62                                 *offset = P - environ;
63                                 return(++C);
64                         }
65         return(NULL);
66 }