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STRNLEN

Section: Linux Programmer's Manual (3)
Updated: 2011-09-28
Index Return to Main Contents

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NAME

strnlen - determine the length of a fixed-size string  

SYNOPSIS

#include <string.h>

size_t strnlen(const char *s, size_t maxlen);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

strnlen():

Since glibc 2.10:

_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L

Before glibc 2.10:

_GNU_SOURCE

 

DESCRIPTION

The strnlen() function returns the number of characters in the string pointed to by s, excluding the terminating null bye ('\0'), but at most maxlen. In doing this, strnlen() looks only at the first maxlen characters at s and never beyond s+maxlen.  

RETURN VALUE

The strnlen() function returns strlen(s), if that is less than maxlen, or maxlen if there is no null byte ('\0') among the first maxlen characters pointed to by s.  

CONFORMING TO

POSIX.1-2008.  

SEE ALSO

strlen(3)  

COLOPHON

This page is part of release 3.35 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://man7.org/linux/man-pages/.

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Index

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

CONFORMING TO

SEE ALSO

COLOPHON

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