solasis strftime 的bug 不支持%C

环境：

    SunOS solaris 5.10 Generic_139556-08 i86pc i386 i86pc

    Thread model: posix
    gcc version 3.4.3 (csl-sol210-3_4-branch+sol_rpath)  

man帮助说明是:  

%C       Century number (the year divided by 100  and  trun-
              cated to an integer as a decimal number [01,99]).

目的：需要格式20090101.

例子：

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
main()
{
    time_t t;
    time ( &t );
    char machine_date[17];
    t = time(0);
    cftime(machine_date,"%C%y%d%m",&t);

    //cftime(machine_date,"%Y%d%m",&t);
    printf("[%s]\n",machine_date);
}

%C输出：

   [Wed May 27 17:38:10 CST 2009092705]

%Y才是需要的:

   [20072705]