为何iconv转换不成功呢?
下面的程序从GB2312转换到UTF-8.   ibuf里面存放的是 "品 "的GB2312编码,
obuf里面存放将要转换的UTF-8编码,但最后obuf里面内容不正确,
不知道问题出在什么地方?   请指点一下!

#include   "stdio.h "
#include   "unistd.h "
#include   "fcntl.h "
#include   "iconv.h "
#include   "string.h "
#define   BUFLEN   20

int   main()
{
iconv_t   cd;
char   obuf[BUFLEN];
char*   pobuf   =   obuf;
char   ibuf[BUFLEN]   =   {0xc6,   0xb7,   0x00};
char*   pibuf   =   ibuf;

size_t   ilen,olen,ret;

const   char*   from_code   =   "gb2312 ";
const   char*   to_code   =   "utf-8 ";

ilen   =   strlen(ibuf);
olen   =   BUFLEN;
printf( "\n ");

if   ((cd=iconv_open(to_code,   from_code))   ==   (iconv_t)-1)
{
printf( "failed   to   conv   GB2312   to   UTF-8\n ");
exit(-1);
}

if   (iconv(cd,   &pibuf,   &ilen,   &pobuf,   &olen)   ==   (size_t)-1)
{
printf( "failed   to   conv   buf\n ");
exit(-1);
}

printf( "pobuf   =   %s\n ",   pobuf);
printf( "pobuf[0]   =   %x,   pobuf[1]   =   %x,   pobuf[2]   =   %x\n ",   pobuf[0],   pobuf[1],   pobuf[2]);

iconv_close(cd);

return   0;
}




------解决方案--------------------
源代码在这里：http://code.google.com/p/libkf701/ 一起写来吧

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <iconv.h>
#include <limits.h>

#ifndef SIZE_MAX
# define SIZE_MAX ((size_t) -1)
#endif

/**
* @brief codeset convert
*
* Convert a zero-terminated string STR from the FROM_CODSET code set
* to the TO_CODESET code set. The returned string is allocated using
* malloc, and must be dellocated by the caller using free. On
* failure, NULL is returned and errno holds the error reason. Note
* that if TO_CODESET uses 0 for anything but to terminate the
* string, the caller of this function may have difficulties finding
* out the length of the output string.
*
* @param str raw buffer need convert
* @param from_codeset such as "gbk "
* @param to_codeset such as "utf-8 "
*
* @return the converted buffer or NULL when faild
* you must free the retval buffer yourself
*
*/
char *iconv_string (const char *str, const char *from_codeset,
const char *to_codeset)
{
char *dest = NULL;
iconv_t cd;
char *outp;
char *p = (char *) str;
size_t inbytes_remaining = strlen (p);
/* Guess the maximum length the output string can have. */
size_t outbuf_size = inbytes_remaining + 1;
size_t outbytes_remaining;
size_t err;
int have_error = 0;

/* Use a worst-case output size guess, so long as that wouldn 't be
too large for comfort. It 's OK if the guess is wrong so long as
it 's nonzero. */
size_t approx_sqrt