The Open Group Base Specifications Issue 7, 2018 edition
IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)
Copyright © 2001-2018 IEEE and The Open GroupA newer edition of this document exists here
NAME
strspn - get length of a substring
SYNOPSIS
#include <string.h>
size_t strspn(const char *s1, const char *s2);
DESCRIPTION
[CX] ![[Option Start]](../images/opt-start.gif)
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.1-2017 defers to the ISO C
standard.
![[Option End]](../images/opt-end.gif)
The strspn() function shall compute the length (in bytes) of the maximum initial segment of the string pointed to by
s1 which consists entirely of bytes from the string pointed to by s2.
RETURN VALUE
The strspn() function shall return the computed length; 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
strcspn
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 strspn() returns the length of s, and not s itself as
was previously stated.
Issue 7
SD5-XSH-ERN-182 is applied.
End of informative text.
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