parse_asntype(FILE * fp, char *name, int *ntype, char *ntoken)
{
    int             type, i;
    char            token[MAXTOKEN];
    char            quoted_string_buffer[MAXQUOTESTR];
    char           *hint = NULL;
    char           *descr = NULL;
    struct tc      *tcp;
    int             level;

    type = get_token(fp, token, MAXTOKEN);
    if (type == SEQUENCE || type == CHOICE) {
        level = 0;
        while ((type = get_token(fp, token, MAXTOKEN)) != ENDOFFILE) {
            if (type == LEFTBRACKET) {
                level++;
            } else if (type == RIGHTBRACKET && --level == 0) {
                *ntype = get_token(fp, ntoken, MAXTOKEN);
                return NULL;
            }
        }
        print_error("Expected \"}\"", token, type);
        return NULL;
    } else if (type == LEFTBRACKET) {
        struct node    *np;
        int             ch_next = '{';
        ungetc(ch_next, fp);
        np = parse_objectid(fp, name);
        if (np != NULL) {
            *ntype = get_token(fp, ntoken, MAXTOKEN);
            return np;
        }
        return NULL;
    } else if (type == LEFTSQBRACK) {
        int             size = 0;
        do {
            type = get_token(fp, token, MAXTOKEN);
        } while (type != ENDOFFILE && type != RIGHTSQBRACK);
        if (type != RIGHTSQBRACK) {
            print_error("Expected \"]\"", token, type);
            return NULL;
        }
        type = get_token(fp, token, MAXTOKEN);
        if (type == IMPLICIT)
            type = get_token(fp, token, MAXTOKEN);
        *ntype = get_token(fp, ntoken, MAXTOKEN);
        if (*ntype == LEFTPAREN) {
            switch (type) {
            case OCTETSTR:
                *ntype = get_token(fp, ntoken, MAXTOKEN);
                if (*ntype != SIZE) {
                    print_error("Expected SIZE", ntoken, *ntype);
                    return NULL;
                }
                size = 1;
                *ntype = get_token(fp, ntoken, MAXTOKEN);
                if (*ntype != LEFTPAREN) {
                    print_error("Expected \"(\" after SIZE", ntoken,
                                *ntype);
                    return NULL;
                }
                /* FALL THROUGH */
            case INTEGER:
                *ntype = get_token(fp, ntoken, MAXTOKEN);
                do {
                    if (*ntype != NUMBER)
                        print_error("Expected NUMBER", ntoken, *ntype);
                    *ntype = get_token(fp, ntoken, MAXTOKEN);
                    if (*ntype == RANGE) {
                        *ntype = get_token(fp, ntoken, MAXTOKEN);
                        if (*ntype != NUMBER)
                            print_error("Expected NUMBER", ntoken, *ntype);
                        *ntype = get_token(fp, ntoken, MAXTOKEN);
                    }
                } while (*ntype == BAR);
                if (*ntype != RIGHTPAREN) {
                    print_error("Expected \")\"", ntoken, *ntype);
                    return NULL;
                }
                *ntype = get_token(fp, ntoken, MAXTOKEN);
                if (size) {
                    if (*ntype != RIGHTPAREN) {
                        print_error("Expected \")\" to terminate SIZE",
                                    ntoken, *ntype);
                        return NULL;
                    }
                    *ntype = get_token(fp, ntoken, MAXTOKEN);
                }
            }
        }
        return NULL;
    } else {
        if (type == CONVENTION) {
            while (type != SYNTAX && type != ENDOFFILE) {
                if (type == DISPLAYHINT) {
                    type = get_token(fp, token, MAXTOKEN);
                    if (type != QUOTESTRING) {
                        print_error("DISPLAY-HINT must be string", token,
                                    type);
                    } else {
                        free(hint);
                        hint = strdup(token);
                    }
                } else if (type == DESCRIPTION &&
                           netsnmp_ds_get_boolean(NETSNMP_DS_LIBRARY_ID, 
                                                  NETSNMP_DS_LIB_SAVE_MIB_DESCRS)) {
                    type = get_token(fp, quoted_string_buffer, MAXQUOTESTR);
                    if (type != QUOTESTRING) {
                        print_error("DESCRIPTION must be string", token,
                                    type);
                    } else {
                        free(descr);
                        descr = strdup(quoted_string_buffer);
                    }
                } else
                    type =
                        get_token(fp, quoted_string_buffer, MAXQUOTESTR);
            }
            type = get_token(fp, token, MAXTOKEN);
            if (type == OBJECT) {
                type = get_token(fp, token, MAXTOKEN);
                if (type != IDENTIFIER) {
                    print_error("Expected IDENTIFIER", token, type);
                    goto err;
                }
                type = OBJID;
            }
        } else if (type == OBJECT) {
            type = get_token(fp, token, MAXTOKEN);
            if (type != IDENTIFIER) {
                print_error("Expected IDENTIFIER", token, type);
                goto err;
            }
            type = OBJID;
        }

        if (type == LABEL) {
            type = get_tc(token, current_module, NULL, NULL, NULL, NULL);
        }

        /*
         * textual convention 
         */
        for (i = 0; i < MAXTC; i++) {
            if (tclist[i].type == 0)
                break;
        }

        if (i == MAXTC) {
            print_error("Too many textual conventions", token, type);
            goto err;
        }
        if (!(type & SYNTAX_MASK)) {
            print_error("Textual convention doesn't map to real type",
                        token, type);
            goto err;
        }
        tcp = &tclist[i];
        tcp->modid = current_module;
        tcp->descriptor = strdup(name);
        tcp->hint = hint;
        tcp->description = descr;
        tcp->type = type;
        *ntype = get_token(fp, ntoken, MAXTOKEN);
        if (*ntype == LEFTPAREN) {
            tcp->ranges = parse_ranges(fp, &tcp->ranges);
            *ntype = get_token(fp, ntoken, MAXTOKEN);
        } else if (*ntype == LEFTBRACKET) {
            /*
             * if there is an enumeration list, parse it 
             */
            tcp->enums = parse_enumlist(fp, &tcp->enums);
            *ntype = get_token(fp, ntoken, MAXTOKEN);
        }
        return NULL;
    }

err:
    SNMP_FREE(descr);
    SNMP_FREE(hint);
    return NULL;
}