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Annotation of 43BSDReno/lib/libc/stdlib/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: (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 <stdlib.h>
                     25: #include <stddef.h>
                     26: 
                     27: /*
                     28:  * getenv --
                     29:  *     Returns ptr to value associated with name, if any, else NULL.
                     30:  */
                     31: char *
                     32: getenv(name)
                     33:        char *name;
                     34: {
                     35:        int offset;
                     36:        char *_findenv();
                     37: 
                     38:        return(_findenv(name, &offset));
                     39: }
                     40: 
                     41: /*
                     42:  * _findenv --
                     43:  *     Returns pointer to value associated with name, if any, else NULL.
                     44:  *     Sets offset to be the offset of the name/value combination in the
                     45:  *     environmental array, for use by setenv(3) and unsetenv(3).
                     46:  *     Explicitly removes '=' in argument name.
                     47:  *
                     48:  *     This routine *should* be a static; don't use it.
                     49:  */
                     50: char *
                     51: _findenv(name, offset)
                     52:        register char *name;
                     53:        int *offset;
                     54: {
                     55:        extern char **environ;
                     56:        register int len;
                     57:        register char **P, *C;
                     58: 
                     59:        for (C = name, len = 0; *C && *C != '='; ++C, ++len);
                     60:        for (P = environ; *P; ++P)
                     61:                if (!strncmp(*P, name, len))
                     62:                        if (*(C = *P + len) == '=') {
                     63:                                *offset = P - environ;
                     64:                                return(++C);
                     65:                        }
                     66:        return(NULL);
                     67: }

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