e-mail parser

/*
just another simple e-mail parse
author: Cooler_
contact: c00f3r [at] gmail [dot] com

*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// return reverse string
char *strrev(char *str);

int
main()
{
 char *host="@gmail.com",*domain;
 static char *s="lol blah [email protected]  blablablabla [email protected] bha bla [email protected] a aas  blah blah";
 char *words=(char *)malloc(sizeof(char)*1024);
 char *email=(char *)malloc(sizeof(char)*1024);
 int x=0,z=0;

  domain=strdup(host);
  domain=strrev(domain);

  do{
   if(*s==' ')
   {
    words=strrev(words);

// compare end word to reverse string of host
    while( *(domain+z)==*(words+z))
     z++;

    if(z==strlen(domain))
    {
     email=strrev(words);
     puts(email);
    }

    memset(words,0,strlen(words));
    words=strdup(" ");

    x=0;
    z=0;
   } else
    *(words+x)=*s,x++;

   s++;
  }while(*s != '\0');

 free(email);
 free(domain);
 free(words);

 return 0;
}


// return reverse string
char
*strrev(char *str)
{
 char *p1, *p2;
 memset(str,0,0);

 if(! str || ! *str)
  return str;
 for(p1 = str, p2 = str + strlen(str) - 1; p2 > p1; ++p1, --p2)
 {
  *p1 ^= *p2;
  *p2 ^= *p1;
  *p1 ^= *p2;
 }
 return str;
}