/* strstr.c (emx+gcc) -- Copyright (c) 1990-1993 by Eberhard Mattes */

#include <string.h>

char *strstr (const char *string1, const char *string2)
{
  int len1, len2, i;
  char first;

  if (*string2 == 0)
    return ((char *)string1);
  len1 = 0;
  while (string1[len1] != 0) ++len1;
  len2 = 0;
  while (string2[len2] != 0) ++len2;
  if (len2 == 0)
    return ((char *)(string1+len1));
  first = *string2;
  while (len1 >= len2)
    {
      if (*string1 == first)
        {
          for (i = 1; i < len2; ++i)
            if (string1[i] != string2[i])
              break;
          if (i >= len2)
            return ((char *)string1);
        }
      ++string1; --len1;
    }
  return (NULL);
}