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Annotation of 43BSDTahoe/lib/libc/gen/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 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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