移植 iconv

PURPOSE: iconv provides functions that can change codeset from one to another but the working board doesn't not have the functions that <iconv.h> includes, so we add the iconv.h

1. download libiconv-1.14.tar.gz
2. read the INSTALL.generic
3. according to the INSTALL.generic we generate the following install code
   

   #!/bin/bash
   
        mkdir /tmp/iconv
   
        ./configure --host=mipsel-linux CC="mipsel-linux-gcc"  --prefix="/tmp/iconv" --with-configuredir="/tmp/iconv" 
   
        make 
   
        make install

4. then we generate what we need in /tmp/iconv
5. test code
   

        #include "/tmp/iconv/include/iconv.h"
   
        #include <stdio.h>
   
        #include <stdlib.h>
   
        #include <string.h>
   
        #define OUTLEN 255
   
        
   
        //代码转换:从一种编码转为另一种编码
   
        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,&((size_t *)inlen),pout,&((size_t *)outlen) )==-1) return -1;
   
            if (iconv(cd,pin,((size_t *)(&inlen)),pout,((size_t *)(&outlen)) )==-1) return -1;
   
        
   
            iconv_close(cd);
   
            return 0;
   
        }
   
        //UNICODE码转为GB2312码
   
        int u2g(char *inbuf,int inlen,char *outbuf,int outlen)
   
        {
   
            return code_convert("utf-8","gbk",inbuf,inlen,outbuf,outlen);
   
        }
   
        //GB2312码转为UNICODE码
   
        int g2u(char *inbuf,size_t inlen,char *outbuf,size_t outlen)
   
        {
   
            return code_convert("gb2312","utf-8",inbuf,inlen,outbuf,outlen);
   
        }
   
        
   
        main()
   
        {
   
            char *in_utf8[6] =   {"01 26涓","02 瀹跺涵鎴愬憳", "03 姘存灉","04 鏁板瓧1鍒","05 浜斿畼" , "06 中文"};
   
        
   
            char out[OUTLEN];
   
            int rec ;
   
        
   
            //unicode码转为gb2312码
   
            for(int i=0;i<6;i++)
   
            {
   
                //rec = u2g(in_utf8[i],strlen(in_utf8[i]),out,OUTLEN);
   
                rec = u2g(in_utf8[i],255,out,OUTLEN);
   
                printf("unicode-->gb2312 out=%s\n",out);
   
            }
   
        }
        

6. Makefile
   

   all:
   
            mipsel-linux-g++ -w -g conv.cpp -o conv -I/tmp/iconv/include/ -L/tmp/iconv/lib/ -liconv

we can use use it now , after we do the following steps:
copy the libs that generated in /tmp/iconv

cd /usr/local/bin/

export PATH=LD_LIBRARY=$TOOLCHAIN./

./conv

here is the end of this note