2004-11-03 13:51:07 +00:00
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.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
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.\"
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" References consulted:
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.\" GNU glibc-2 source code and manual
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.\"
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.TH STRNLEN 3 1999-07-25 "GNU" "Linux Programmer's Manual"
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.SH NAME
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strnlen \- determine the length of a fixed-size string
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.SH SYNOPSIS
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.nf
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2005-09-15 12:40:42 +00:00
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.B #define _GNU_SOURCE
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.sp
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2004-11-03 13:51:07 +00:00
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.B #include <string.h>
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.sp
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.BI "size_t strnlen(const char *" s ", size_t " maxlen );
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.fi
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.SH DESCRIPTION
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2007-05-12 09:06:04 +00:00
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The
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.BR strnlen ()
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function returns the number of characters in the string
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2004-11-03 13:51:07 +00:00
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pointed to by \fIs\fP, not including the terminating '\\0' character, but
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2007-04-24 16:44:51 +00:00
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at most \fImaxlen\fP.
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2007-05-12 09:06:04 +00:00
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In doing this,
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.BR strnlen ()
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looks only at the first
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2004-11-03 13:51:07 +00:00
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\fImaxlen\fP characters at \fIs\fP and never beyond \fIs+maxlen\fP.
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.SH "RETURN VALUE"
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2007-05-12 09:06:04 +00:00
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The
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.BR strnlen ()
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function returns \fIstrlen(s)\fP, if that is less than
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2004-11-03 13:51:07 +00:00
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\fImaxlen\fP, or \fImaxlen\fP if there is no '\\0' character among the first
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\fImaxlen\fP characters pointed to by \fIs\fP.
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.SH "CONFORMING TO"
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This function is a GNU extension.
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.SH "SEE ALSO"
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2007-01-28 20:00:24 +00:00
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.BR strlen (3),
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.BR feature_test_macros (7)
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