Unix下UTF-8和GB2312互相转换的函数

#include<iostream>
#include<iconv.h>

using namespace std;

int utf8togb2312(const char *sourcebuf,size_t sourcelen,char *destbuf,size_t destlen)
{
iconv_t cd;
if( (cd = iconv_open("gb2312","utf-8")) ==0 )
return -1;
memset(destbuf,0,destlen);
const char **source = &sourcebuf;
char **dest = &destbuf;

if(-1 == iconv(cd,source,&sourcelen,dest,&destlen))
return -1;
iconv_close(cd);
return 0;

}

int gb2312toutf8(const char *sourcebuf,size_t sourcelen,char *destbuf,size_t destlen)
{
iconv_t cd;
if( (cd = iconv_open("utf-8","gb2312")) ==0 )
return -1;
memset(destbuf,0,destlen);
const char **source = &sourcebuf;
char **dest = &destbuf;

if(-1 == iconv(cd,source,&sourcelen,dest,&destlen))
return -1;
iconv_close(cd);
return 0;

}

int main()
{
FILE *fp = fopen("love.txt","r");
if(fp == NULL)
{
cout << "open file faiulre" << endl;
return 1;
}
char line[80];
memset(line,0,80);
if( NULL == fgets(line,80,fp))
{
cout << "read file failure" << endl;
return 2;
}

char dest_gb2312[80];

utf8togb2312(line,strlen(line),dest_gb2312,80);
cout << "before convert(utf-8): " << line << endl;
cout << "after convert(gb2312): " << dest_gb2312 << endl;

cout << endl << endl;
char dest_utf8[80];
gb2312toutf8(dest_gb2312,strlen(dest_gb2312),dest_utf8,80);
cout << "before convert(gb2312)" << dest_gb2312 << endl;
cout << "after convert(utf-8)" << dest_utf8 << endl;

return 0;
}