search a string for any of a set of bytes
Standard C library (libc, -lc)
The strpbrk() function locates the first occurrence in the string s of any of the bytes in the string accept.
The strpbrk() function returns a pointer to the byte in s that matches one of the bytes in accept, or NULL if no such byte is found.
For an explanation of the terms used in this section, see attributes(7).
C11, POSIX.1-2008.
POSIX.1-2001, C89, SVr4, 4.3BSD.