strchrnul

       #include <string.h>

       char *strchr(const char *s, int c);

       char *strrchr(const char *s, int c);

       #define _GNU_SOURCE         /* See feature_test_macros(7) */
       #include <string.h>

       char *strchrnul(const char *s, int c);

DESCRIPTION
       The  strchr() function returns a pointer to the first occurrence of the
       character c in the string s.

       The strrchr() function returns a pointer to the last occurrence of  the
       character c in the string s.

       The strchrnul() function is like strchr() except that if c is not found
       in s, then it returns a pointer to the null  byte  at  the  end  of  s,
       rather than NULL.

       Here "character" means "byte"; these functions do not work with wide or
       multibyte characters.

RETURN VALUE
       The strchr() and strrchr() functions return a pointer  to  the  matched
       character  or NULL if the character is not found.  The terminating null
       byte is considered part of the string, so that if  c  is  specified  as
       '\0', these functions return a pointer to the terminator.

       The strchrnul() function returns a pointer to the matched character, or
       a pointer to the null byte at the end of s (i.e., s+strlen(s))  if  the
       character is not found.

VERSIONS
       strchrnul() first appeared in glibc in version 2.1.1.

ATTRIBUTES
       For   an   explanation   of   the  terms  used  in  this  section,  see
       attributes(7).

       +---------------------------------+---------------+---------+
       |Interface                        | Attribute     | Value   |
       +---------------------------------+---------------+---------+
       |strchr(), strrchr(), strchrnul() | Thread safety | MT-Safe |
       +---------------------------------+---------------+---------+
CONFORMING TO
       strchr(),  strrchr():  POSIX.1-2001,  POSIX.1-2008,  C89,  C99,   SVr4,
       4.3BSD.

       strchrnul() is a GNU extension.

SEE ALSO
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