strspn(3)strspn(3)NAME
strcspn, strspn - Return length of initial segment of string
SYNOPSIS
#include <string.h>
size_t strcspn(
const char *s1,
const char *s2 ); size_t strspn(
const char *s1,
const char *s2 );
LIBRARY
Standard C Library (libc)
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards 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 seg‐
ment 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 sin‐
gle unit but rather as a series of separate bytes. There are no equiva‐
lent functions for multibyte character strings. The wcsspn() and wcsc‐
spn() 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.
SEE ALSO
Functions: string(3), wcsspn(3), wcscspn(3)
Standards: standards(5)strspn(3)
