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
   
   View 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