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### 5.22 `strchrnul`—search for character in string

Synopsis

         #include <string.h>
         char * strchrnul(const char *string, int c);

Description
This function finds the first occurence of c (converted to a char) in the string pointed to by string (including the terminating null character).

Returns
Returns a pointer to the located character, or a pointer to the concluding null byte if c does not occur in string.

Portability
`strchrnul` is a GNU extension.

`strchrnul` requires no supporting OS subroutines. It uses strchr() and strlen() from elsewhere in this library.