utf_8与GB2312编码的转换

#include<iconv.h>
#include<stdio.h>
#include<string.h>
#define OUTLEN 1024

int code_convert(char *from_charset, char *to_charset, char *inbuf, int inlen, char *outbuf, int 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;
}

int u2g(char *inbuf,int inlen,char *outbuf,int outlen)
{
 return code_convert("utf-8","gb2312",inbuf,inlen,outbuf,outlen);

}
int g2u(char *inbuf,int inlen,char *outbuf,size_t outlen)
{
 return code_convert("gb2312","utf-8",inbuf,inlen,outbuf,outlen);

}

int convert(char *in_gb2312)
{
  char out[OUTLEN];
  int rc = g2u(in_gb2312, strlen(in_gb2312), out, OUTLEN);
  strcpy(in_gb2312,out);
 // printf("%s\n", out);
 
}