Man page - strnlen(3)

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Manual

strnlen

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ATTRIBUTES
STANDARDS
HISTORY
SEE ALSO

NAME

strnlen - determine the length of a fixed-size string

LIBRARY

Standard C library ( libc , -lc )

SYNOPSIS

#include <string.h>

size_t strnlen(const char s [. maxlen ], size_t maxlen );

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

strnlen ():
Since glibc 2.10:
_POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
_GNU_SOURCE

DESCRIPTION

The strnlen () function returns the number of bytes in the string pointed to by s , excluding the terminating null byte ('\0'), but at most maxlen . In doing this, strnlen () looks only at the first maxlen characters in the string pointed to by s and never beyond s[maxlen-1] .

RETURN VALUE

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

ATTRIBUTES

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

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STANDARDS

POSIX.1-2008.

HISTORY

POSIX.1-2008.

SEE ALSO

strlen (3)