memchr
From cppreference.com
                    
                                        
                    
                    
                                                            
                    | Defined in header <string.h>
  | ||
| const void* memchr( const void* ptr, int ch, size_t count ); | ||
|       void* memchr(       void* ptr, int ch, size_t count ); | ||
Converts ch to unsigned char and locates the first occurrence of that value in the initial count characters (each interpreted as unsigned char) of the object pointed to by ptr.
| Contents | 
[edit] Parameters
| ptr | - | pointer to the object to be examined | 
| ch | - | character to search for | 
| count | - | number of characters to examine | 
[edit] Return value
Pointer to the location of the character, or NULL if no such character is found.
[edit] Example
| This section is incomplete Reason: no example | 
[edit] See also
| finds the first occurrence of a character (function) | |