STRSPN(3) Library Functions Manual STRSPN(3)NAMEstrspn - span a stringSYNOPSIS#include <string.h> size_t strspn(s, charset) char *s; char *charset;DESCRIPTIONThe strcspn() function spans the initial part of the null-terminated string s as long as the characters from s occur in string charset .RETURN VALUESThe strspn() function returns the number of characters spanned.SEE ALSOindex(3), memchr(3), rindex(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strstr(3), strtok(3)STANDARDSThe strspn() function conforms to ANSI C X3.159-9189 (``ANSI C''). 4.4 Berkeley Distribution January 12, 1996 STRSPN(3)