#include <math.h>
void fetch_str(char *str_in, char *str_out);
int main(){
char test[] = "<a>This is the <...> string</a>";
char result[256];
fetch_str(test, result);
printf("\ntest\t=%s\n", test);
printf("\nresult\t=%s\n",result);
return 1;
}
void fetch_str(char *str_in, char *str_out)
{
char begin_str[] = "<a>";
char end_str[] = "</a>";
int index_end =0;
int index_begin=0;
int flag_begin =0;
int flag_end =0;
int str_index=0;
int i;
// to find the max index of str_in
while(str_in[str_index]!='\0')
{
str_index++;
}
str_index--;
//printf("%s %s", begin_str, end_str);
int count=0;
while(str_in[count]!='\0')
{
// to find the begin index of the target string
if( flag_begin==0 && count<=(str_index-2) )
{
if( str_in[count]==begin_str[0] && str_in[count+1]==begin_str[1] && str_in[count+2]==begin_str[2] )
{
flag_begin=1;
index_begin=count+3;
}
}
// to find the end index of the target string
//if( flag_end==0 && count<=(str_index-3) )
if(count<=(str_index-3) )
{
if( str_in[count]==end_str[0] && str_in[count+1]==end_str[1] && str_in[count+2]==end_str[2] && str_in[count+3]==end_str[3])
{
flag_end=1;
index_end=count-1;
}
}
count++;
}
//printf("\nbegin_index=%d, end_index=%d\n", index_begin, index_end);
// to copy the target string to str_out
count=0;
for(i=index_begin;i<=index_end;i++)
{
str_out[count]=str_in[i];
count++;
}
str_out[count]='\0';
return;
}