strspn(9) centos man page | unix.com

STRSPN(9)						     Basic C Library Functions							 STRSPN(9)

NAME
       strspn - Calculate the length of the initial substring of s which only contain letters in accept

SYNOPSIS
       size_t strspn(const char * s, const char * accept);

ARGUMENTS
       s
	   The string to be searched

       accept
	   The string to search for

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014								 STRSPN(9)