//
#include <stdio.h>
#include <string.h>
#define MAXLEN_OF_SM_CONTENT 200
char uniTempStr[1024];
/* five chars have transferred meaning in XML document
< <
> >
& &
' '
" "
*/
char* txt_to_xml(const char* content, int length)
{
const char *cursor=content;
const char *end=content+((length>MAXLEN_OF_SM_CONTENT)?MAXLEN_OF_SM_CONTENT:length);
char *newcontent=uniTempStr;
char* pnew=newcontent;
int len=MAXLEN_OF_SM_CONTENT;
// memset(newcontent,'/0',MAXLEN_OF_SM_CONTENT+1);
while ((cursor<end)&&(len>0))
{
switch(*cursor)
{
case '<':
if (len>=4)
{memcpy(pnew,"<",4); pnew+=4; cursor++; len-=4;}
else
len=0;
break;
case '>':
if (len>=4)
{memcpy(pnew,">",4); pnew+=4; cursor++; len-=4;}
else
len=0;
break;
case '&':
if (len>=5)
{memcpy(pnew,"&",5); pnew+=5; cursor++; len-=5;}
else
len=0;
break;
case '/'':
if (len>=6)
{memcpy(pnew,"'",6); pnew+=6; cursor++; len-=6;}
else
len=0;
break;
case '"':
if (len>=6)
{memcpy(pnew,""",6); pnew+=6; cursor++; len-=6;}
else
len=0;
break;
default: { *pnew++=*cursor++; len-=1;}
break;
}
// printf("%c len:%d/r/ncontent:%s/r/n",*(cursor-1),len,newcontent);
// printf("pnew-newcontent=%d/n",pnew-newcontent);
}
// printf("pnew-newcontent=%d/n",pnew-newcontent);
// printf("content:%s/n",newcontent);
*pnew='/0';
return newcontent;
}
char* xml_to_txt(const char* content, int length)
{
const char *cursor=content;
const char *end=content+((length>MAXLEN_OF_SM_CONTENT)?MAXLEN_OF_SM_CONTENT:length);
char *newcontent=uniTempStr;
char* pnew=newcontent;
while (cursor<end)
{
if ('&'==*cursor)
{
if (0==strncmp(cursor,"<",4))
{*pnew++='<'; cursor+=4;}
else if (0==strncmp(cursor,">",4))
{*pnew++='>'; cursor+=4;}
else if (0==strncmp(cursor,"&",5))
{*pnew++='&'; cursor+=5;}
else if (0==strncmp(cursor,"'",6))
{*pnew++='/''; cursor+=6;}
else if (0==strncmp(cursor,""",6))
{*pnew++='"'; cursor+=6;}
else
{*pnew++='.'; cursor++;}
}
else
{*pnew++=*cursor++;}
}
*pnew='/0';
return newcontent;
}
int main(int argc, char** argv)
{
// if (argc<2)
// return 0;
char *pstr = "sdfsd;f/"<1234>&678";
printf("%s/n",pstr);
char *pstr2 = txt_to_xml(pstr,strlen(pstr));
printf("%s/n",pstr2);
printf("%s/n",xml_to_txt(pstr2,strlen(pstr2)));
getchar();
}