low_str_strspn

Find the first substring. 

l_size_t 	low_str_strspn ( 
			cl_text 		s1,
			cl_text 		 set
);

Return Value

low_str_strspn return an integer value specifying the length of the substring in string @s1 that consists entirely of 
characters in @set. If string @s1 begins with a character not in @set, the function returns 0. No return value is reserved 
to indicate an error. No return value is reserved to indicate an error.

Parameters

s1

Null-terminated string to search

set

Null-terminated character set

Remarks

The low_str_strspn function returns the index of the first character in string @s1 that does not belong to the set of 
characters in @set. The search does not include terminating null characters.