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Annotation of 43BSD/lib/libc/gen/getenv.c, revision 1.1

1.1     ! root        1: #if defined(LIBC_SCCS) && !defined(lint)
        !             2: static char sccsid[] = "@(#)getenv.c   5.2 (Berkeley) 3/9/86";
        !             3: #endif LIBC_SCCS and not lint
        !             4: 
        !             5: /*
        !             6:  *     getenv(name)
        !             7:  *     returns ptr to value associated with name, if any, else NULL
        !             8:  */
        !             9: #define NULL   0
        !            10: extern char **environ;
        !            11: char   *nvmatch();
        !            12: 
        !            13: char *
        !            14: getenv(name)
        !            15: register char *name;
        !            16: {
        !            17:        register char **p = environ;
        !            18:        register char *v;
        !            19: 
        !            20:        while (*p != NULL)
        !            21:                if ((v = nvmatch(name, *p++)) != NULL)
        !            22:                        return(v);
        !            23:        return(NULL);
        !            24: }
        !            25: 
        !            26: /*
        !            27:  *     s1 is either name, or name=value
        !            28:  *     s2 is name=value
        !            29:  *     if names match, return value of s2, else NULL
        !            30:  *     used for environment searching: see getenv
        !            31:  */
        !            32: 
        !            33: static char *
        !            34: nvmatch(s1, s2)
        !            35: register char *s1, *s2;
        !            36: {
        !            37: 
        !            38:        while (*s1 == *s2++)
        !            39:                if (*s1++ == '=')
        !            40:                        return(s2);
        !            41:        if (*s1 == '\0' && *(s2-1) == '=')
        !            42:                return(s2);
        !            43:        return(NULL);
        !            44: }

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