Character string search from character string
char __near * __far strstr(const char __near *s1, const char __near *s2);
char __far * __far _COM_strstr_ff(const char __far *s1, const char __far *s2);
Returns the pointer indicating the character string that has been found. If character string indicated by s2 is not found, the null pointer is returned. If s2 indicates a character string with a length of 0, s1 is returned.
This function obtains the position of the portion (except the null character (\0)) that first coincides with the character string indicated by s2, in the character string indicated by s1.