//============================================================================ // Name : test.cpp // Author : // Version : // Copyright : Your copyright notice // Description : Hello World in C++, Ansi-style //============================================================================ #include 
     
       using namespace std; extern "C" {
   #include 
      
        #include 
       
         #include 
        
          #include 
         
           #include 
          
            } // You must free the result if result is non-NULL. char *str_replace(char *orig, char *rep, char *with) { char *result; // the return string char *ins; // the next insert point char *tmp; // varies int len_rep; // length of rep int len_with; // length of with int len_front; // distance between rep and end of last rep int count; // number of replacements if (!orig) return NULL; if (!rep || !(len_rep = strlen(rep))) return NULL; if (!(ins = strstr(orig, rep))) return NULL; if (!with) with = ""; len_with = strlen(with); for (count = 0; tmp = strstr(ins, rep); ++count) { ins = tmp + len_rep; } // first time through the loop, all the variable are set correctly // from here on, // tmp points to the end of the result string // ins points to the next occurrence of rep in orig // orig points to the remainder of orig after "end of rep" tmp = result = (char *)malloc(strlen(orig) + (len_with - len_rep) * count + 1); if (!result) return NULL; while (count--) { ins = strstr(orig, rep); len_front = ins - orig; tmp = strncpy(tmp, orig, len_front) + len_front; tmp = strcpy(tmp, with) + len_with; orig += len_front + len_rep; // move to next "end of rep" } strcpy(tmp, orig); return result; } int main() { char *me = "thank you"; char *result = str_replace(me, "th", "me"); cout << result << endl; // prints !!!Hello World!!! free(result); return 0; }