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Annotation of 43BSDTahoe/lib/libc/gen/getenv.c, revision 1.1.1.1

1.1       root        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 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.
                     16:  */
                     17: 
                     18: #if defined(LIBC_SCCS) && !defined(lint)
                     19: static char sccsid[] = "@(#)getenv.c   5.5 (Berkeley) 6/27/88";
                     20: #endif /* LIBC_SCCS and not lint */
                     21: 
                     22: #include <stdio.h>
                     23: 
                     24: /*
                     25:  * getenv --
                     26:  *     Returns ptr to value associated with name, if any, else NULL.
                     27:  */
                     28: char *
                     29: getenv(name)
                     30:        char *name;
                     31: {
                     32:        int offset;
                     33:        char *_findenv();
                     34: 
                     35:        return(_findenv(name, &offset));
                     36: }
                     37: 
                     38: /*
                     39:  * _findenv --
                     40:  *     Returns pointer to value associated with name, if any, else NULL.
                     41:  *     Sets offset to be the offset of the name/value combination in the
                     42:  *     environmental array, for use by setenv(3) and unsetenv(3).
                     43:  *     Explicitly removes '=' in argument name.
                     44:  *
                     45:  *     This routine *should* be a static; don't use it.
                     46:  */
                     47: char *
                     48: _findenv(name, offset)
                     49:        register char *name;
                     50:        int *offset;
                     51: {
                     52:        extern char **environ;
                     53:        register int len;
                     54:        register char **P, *C;
                     55: 
                     56:        for (C = name, len = 0; *C && *C != '='; ++C, ++len);
                     57:        for (P = environ; *P; ++P)
                     58:                if (!strncmp(*P, name, len))
                     59:                        if (*(C = *P + len) == '=') {
                     60:                                *offset = P - environ;
                     61:                                return(++C);
                     62:                        }
                     63:        return(NULL);
                     64: }

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