get_column
p = get_column(linebuf, key_idx, delim, buf, sizeof(buf));
vp = get_column(linebuf, map->map_valcolno, delim, buf, sizeof(buf));
p = get_column(line, i, '\0', nbuf, sizeof(nbuf));
extern char *get_column __P((char *, int, int, char *, int));