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Annotation of 3BSD/libF77/getenv_.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * getenv - f77 subroutine to return environment variables
        !             3:  *
        !             4:  * called by:
        !             5:  *     call getenv (ENV_NAME, char_var)
        !             6:  * where:
        !             7:  *     ENV_NAME is the name of an environment variable
        !             8:  *     char_var is a character variable which will receive
        !             9:  *             the current value of ENV_NAME, or all blanks
        !            10:  *             if ENV_NAME is not defined
        !            11:  */
        !            12: 
        !            13: getenv_(fname, value, flen, vlen)
        !            14: char *value, *fname;
        !            15: long int vlen, flen;
        !            16: {
        !            17: extern char **environ;
        !            18: register char *ep, *fp, *flast;
        !            19: register char **env = environ;
        !            20: 
        !            21: flast = fname + flen;
        !            22: for(fp = fname ; fp < flast ; ++fp)
        !            23:        if(*fp == ' ')
        !            24:                {
        !            25:                flast = fp;
        !            26:                break;
        !            27:                }
        !            28: 
        !            29: while (ep = *env++)
        !            30:        {
        !            31:        for(fp = fname; fp<flast ; )
        !            32:                if(*fp++ != *ep++)
        !            33:                        goto endloop;
        !            34: 
        !            35:        if(*ep++ == '=')        /* copy right hand side */
        !            36:                while( *ep && --vlen>=0 )
        !            37:                        *value++ = *ep++;
        !            38: 
        !            39:        goto blank;
        !            40: 
        !            41: endloop: ;
        !            42:        }
        !            43: 
        !            44: blank:
        !            45:        while( --vlen >= 0 )
        !            46:                *value++ = ' ';
        !            47: return(0);
        !            48: }

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