strcspn

(3)

get length of a prefix substring

Library functionsmanpages-dev 6.9.1-1also documents strspn

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

LIBRARY

Standard C library (libc, -lc)

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.

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.

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

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

C11, POSIX.1-2008.

POSIX.1-2001, C89, SVr4, 4.3BSD.