Section (3) strnlen


Linux manual pages Section 3  

Name

strnlen — determine the length of a fixed-size string

Synopsis

#include <string.h>
size_t strnlen( const char *s,
  size_t maxlen);
 
[Note] Note
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 (_zsingle_quotesz__zsingle_quotesz_), 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.

RETURN VALUE

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

ATTRIBUTES

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

Interface Attribute Value
strnlen() Thread safety MT-Safe

CONFORMING TO

POSIX.1-2008.

SEE ALSO

strlen(3)

COLOPHON

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  Copyright (c) Bruno Haible <haibleclisp.cons.org>

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References consulted:
  GNU glibc-2 source code and manual