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Annotation of 43BSDReno/lib/libc/stdlib/getenv.c, revision 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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