linux c將緩存字符串進行編碼轉換

#include <stdio.h>
#include <stdlib.h>
#include <iconv.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <iconv.h>
#include <errno.h>
#include <string.h>
	
iconv_t charset_init(char *tocharset,char *fromcharset)
{
    iconv_t charst;
    if(NULL == fromcharset || NULL == tocharset ||
       0 == strlen(fromcharset) || 0 == strlen(tocharset))
        return NULL;

    charst = iconv_open(tocharset, fromcharset);
    if((iconv_t)-1 == charst)
    {
        printf("iconv open error %s\n",strerror(errno));
        return (iconv_t)-1;
    }
    return charst;
}

void charset_close(iconv_t charst)
{
    if(charst < 0)
       return;
    iconv_close(charst);
    return;
}

void change_charset(iconv_t charst,char *inbuf,size_t *inlen,char *outbuf,size_t *olen)
{
    size_t re;

    re = iconv(charst, &inbuf,inlen,&outbuf,olen);
    if(-1 == re)
    {
        printf("iconv error %s\n",strerror(errno));
        return;
    }
    return;
}

/*
使用以下方式將緩存中字符串換成另一種編碼字符輸出
charst = charset_init(tocharset,fromcharset);
if(-1 == charst)
   ...
change_charset(charst, inbuf,&inlen,outbuf,&outlen);
charset_close(charst);
*/