Linux c++/c UTF-8 GB2312中文轉碼實現

#include <iconv.h> 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define OUTLEN 255 

   //代碼轉換:從一種編碼轉爲另一種編碼 
int code_convert(char *from_charset,char *to_charset,char *inbuf,size_t inlen,char *outbuf, size_t outlen) { 
       iconv_t cd; 
       int rc; 
       char **pin = &inbuf; 
       char **pout = &outbuf; 

       cd = iconv_open(to_charset,from_charset); 
       if (cd == 0) return -1; 
       memset(outbuf,0,outlen); 
       if(iconv(cd, pin, &inlen,pout,&outlen) == -1){
           return -1;  
       } 
       iconv_close(cd); 
       return 0; 
 } 
 //UNICODE碼轉爲GB2312碼 
int u2g(char *inbuf,int inlen,char *outbuf,int outlen) { 
    return code_convert("utf-8","gb2312",inbuf,inlen,outbuf,outlen); 
} 
//GB2312碼轉爲UNICODE碼 
int g2u(char *inbuf,size_t inlen,char *outbuf,size_t outlen) { 
    return code_convert("gb2312","utf-8",inbuf,inlen,outbuf,outlen); 
} 
int main() { 
   char *in_utf8 = "姝ｅ?ㄥ??瑁?"; 
   char *in_gb2312 = "正在安裝"; 
   char out[OUTLEN]; 
   int rc = -1;

   //unicode碼轉爲gb2312碼 
   rc = u2g(in_utf8,strlen(in_utf8),out,OUTLEN); 
   printf("unicode-->gb2312 out=%s\n, in_utf8len = %d\n", out, strlen(in_utf8)); 
   //gb2312碼轉爲unicode碼 
   rc = g2u(in_gb2312,strlen(in_gb2312),out,OUTLEN); 
   printf("gb2312-->unicode out=%s\n len =%d\n", out, strlen(in_gb2312)); 
 }