strspn3p
Get length of a substring
Usage
#include <string.h>
size_t strspn(const char *s1, const char *s2);
Prolog
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
Overview
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.
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.