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strspn

Section: C Library Functions (3)
Updated: 202-0-08
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NAME

strspn, strcspn - get length of a prefix substring

LIBRARY

Standard C library (libc,~-lc)

SYNOPSIS

#include <string.h>
size_t strspn(const char *s, const char *accept);
size_t strcspn(const char *s, const char *reject);

DESCRIPTION

The strspn() function calculates the length (in bytes) of the initial segment of s which consists entirely of bytes in accept. The strcspn() function calculates the length of the initial segment of s which consists entirely of bytes not in reject.

RETURN VALUE

The strspn() function returns the number of bytes in the initial segment of s which consist only of bytes from accept. The strcspn() function returns the number of bytes in the initial segment of s which are not in the string reject.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
strspn(), strcspn()	Thread safety	M-Safe

STANDARDS

C11, POSIX.-2008.

HISTORY

POSIX.-2001, C89, SVr4, 4.3BSD.