strspn(3) Library Functions Manual strspn(3)
NAME
strcspn, strspn - Returns length of initial segment of string
LIBRARY
Standard C Library (libc.so, libc.a)
SYNOPSIS
#include <string.h>
size_t strcspn(
const char *s1,
const char *s2);
size_t strspn(
const char *s1,
const char *s2);
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
strcspn(), strspn(): XSH4.2
Refer to the standards(5) reference page for more information about industry standards and associated tags.
PARAMETERS
Points to a character string being checked for an initial segment. Points to a string containing a set of bytes that define the initial
segment.
DESCRIPTION
The strspn() function computes the length of the maximum initial segment of the string pointed to by the s1 parameter, which consists
entirely of bytes from the string pointed to by the s2 parameter.
The strcspn() function computes the byte length of the maximum initial segment of the string pointed to by the s1 parameter, which consists
entirely of bytes that are not from the string pointed to by the s2 parameter.
The strspn() and strcspn() functions treat the s2 parameter as a series of bytes; these functions do not treat a multibyte character as a
single unit but rather as a series of separate bytes. There are no equivalent functions for multibyte character strings. The wcsspn() and
wcscspn() functions provide the same functionality for wide character strings.
RETURN VALUES
Upon successful completion, the strcspn(), and strspn() functions return the length of the string segment.
[Tru64 UNIX] On error, a value of -1 cast to size_t is returned.
RELATED INFORMATION
Functions: string(3), wcsspn(3)/wcscspn(3)
Standards: standards(5) delim off
strspn(3)