Name
strnstr — 
     Find the first substring in a length-limited string
 
Synopsis
| char * strnstr ( | const char * s1, | 
|  | const char * s2, | 
|  | size_t len ); | 
 
Arguments
- s1
- 
     The string to be searched
     
- s2
- 
     The string to search for
     
- len
- 
     the maximum number of characters to search