简单的字符串压缩--C代码

 #include <stdio.h>
 #include <string.h>

 bool compress(char *str)
 {
     char *p=str,c;
     int cnt,i=;

     if(!str)return false;

     p = str;
     while(*p != '\0'){
         cnt = ;
         while(*p == *(p+)){ cnt++;    p++; }
         if(cnt != ){
             c = *p;
             sprintf(&str[i],"%d",cnt);
             i += strlen(&str[i]);
             str[i++] = c;
         }else str[i++] = *p;
         p++;
     }
     str[i] = '\0';

     return true;
 }

 int main(int argc, char* argv[])
 {
     char str[] = "abbcccddddeeeeeeeeeeeeeeeffffffggggggg";    

     printf("%s\r\n",str);
     compress(str);
     printf("%s\r\n",str);

     return ;
 }