mirror of https://github.com/mkerrisk/man-pages
102 lines
2.0 KiB
Groff
102 lines
2.0 KiB
Groff
.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
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.\"
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.\" %%%LICENSE_START(GPLv2+_DOC_ONEPARA)
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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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.\" %%%LICENSE_END
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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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.\" Corrected, aeb, 990824
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.TH STPNCPY 3 2014-01-13 "GNU" "Linux Programmer's Manual"
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.SH NAME
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stpncpy \- copy a fixed-size string, returning a pointer to its end
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.SH SYNOPSIS
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.nf
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.B #include <string.h>
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.sp
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.BI "char *stpncpy(char *" dest ", const char *" src ", size_t " n );
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.fi
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.BR stpncpy ():
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.PD 0
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.ad l
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.RS 4
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.TP 4
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Since glibc 2.10:
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_XOPEN_SOURCE\ >=\ 700 || _POSIX_C_SOURCE\ >=\ 200809L
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.TP
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Before glibc 2.10:
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_GNU_SOURCE
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.RE
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.ad
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.PD
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.SH DESCRIPTION
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The
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.BR stpncpy ()
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function copies at most
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.I n
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characters from the string
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pointed to by
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.IR src ,
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including the terminating null byte (\(aq\\0\(aq),
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to the array pointed to by
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.IR dest .
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Exactly
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.I n
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characters are written at
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.IR dest .
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If the length
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.I strlen(src)
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is smaller than
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.IR n ,
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the
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remaining characters in the array pointed to by
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.I dest
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are filled
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with null bytes (\(aq\\0\(aq),
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If the length
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.I strlen(src)
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is greater than or equal to
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.IR n ,
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the string pointed to by
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.I dest
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will
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not be null-terminated.
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.PP
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The strings may not overlap.
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.PP
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The programmer must ensure that there is room for at least
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.I n
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characters
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at
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.IR dest .
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.SH RETURN VALUE
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.BR stpncpy ()
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returns a pointer to the terminating null byte
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in
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.IR dest ,
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or, if
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.I dest
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is not null-terminated,
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.IR dest + n .
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.SH ATTRIBUTES
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.SS Multithreading (see pthreads(7))
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The
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.BR stpncpy ()
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function is thread-safe.
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.SH CONFORMING TO
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This function was added to POSIX.1-2008.
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Before that, it was a GNU extension.
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.SH SEE ALSO
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.BR strncpy (3),
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.BR wcpncpy (3)
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