The Open Group Base Specifications Issue 7
IEEE Std 1003.1, 2013 Edition
Copyright © 2001-2013 The IEEE and The Open Group

#### NAME

> strcspn - get the length of a complementary substring

#### SYNOPSIS

> ``#include <string.h>
> size_t strcspn(const char *`s1`, const char *`s2`);
> ``

#### DESCRIPTION

> [CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2008 defers to the ISO C standard.

> The strcspn() function shall compute the length (in bytes) of the maximum initial segment of the string pointed to by s1 which consists entirely of bytes not from the string pointed to by s2.

#### RETURN VALUE

> The strcspn() function shall return the length of the computed segment of the string pointed to by s1; no return value is reserved to indicate an error.

#### ERRORS

> No errors are defined.

The following sections are informative.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> None.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> strspn

> XBD <string.h>

#### CHANGE HISTORY

> First released in Issue 1. Derived from Issue 1 of the SVID.

#### Issue 5

> The RETURN VALUE section is updated to indicate that strcspn() returns the length of s1, and not s1 itself as was previously stated.

#### Issue 6

> The Open Group Corrigendum U030/1 is applied. The text of the RETURN VALUE section is updated to indicate that the computed segment length is returned, not the s1 length.

End of informative text.

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