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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-24 04:52:22 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-24 04:52:22 +0000 |
commit | 3d08cd331c1adcf0d917392f7e527b3f00511748 (patch) | |
tree | 312f0d1e1632f48862f044b8bb87e602dcffb5f9 /man/man3/strdup.3 | |
parent | Adding debian version 6.7-2. (diff) | |
download | manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.tar.xz manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.zip |
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man/man3/strdup.3')
-rw-r--r-- | man/man3/strdup.3 | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/man/man3/strdup.3 b/man/man3/strdup.3 new file mode 100644 index 0000000..530ffb9 --- /dev/null +++ b/man/man3/strdup.3 @@ -0,0 +1,145 @@ +'\" t +.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.\" References consulted: +.\" Linux libc source code +.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) +.\" 386BSD man pages +.\" Modified Sun Jul 25 10:41:34 1993 by Rik Faith (faith@cs.unc.edu) +.\" Modified Wed Oct 17 01:12:26 2001 by John Levon <moz@compsoc.man.ac.uk> +.TH strdup 3 2024-05-02 "Linux man-pages (unreleased)" +.SH NAME +strdup, strndup, strdupa, strndupa \- duplicate a string +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.B #include <string.h> +.P +.BI "char *strdup(const char *" s ); +.P +.BI "char *strndup(const char " s [. n "], size_t " n ); +.BI "char *strdupa(const char *" s ); +.BI "char *strndupa(const char " s [. n "], size_t " n ); +.fi +.P +.RS -4 +Feature Test Macro Requirements for glibc (see +.BR feature_test_macros (7)): +.RE +.P +.BR strdup (): +.nf + _XOPEN_SOURCE >= 500 +.\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED + || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L + || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE +.fi +.P +.BR strndup (): +.nf + Since glibc 2.10: + _POSIX_C_SOURCE >= 200809L + Before glibc 2.10: + _GNU_SOURCE +.fi +.P +.BR strdupa (), +.BR strndupa (): +.nf + _GNU_SOURCE +.fi +.SH DESCRIPTION +The +.BR strdup () +function returns a pointer to a new string which +is a duplicate of the string +.IR s . +Memory for the new string is +obtained with +.BR malloc (3), +and can be freed with +.BR free (3). +.P +The +.BR strndup () +function is similar, but copies at most +.I n +bytes. +If +.I s +is longer than +.IR n , +only +.I n +bytes are copied, and a terminating null byte (\[aq]\e0\[aq]) is added. +.P +.BR strdupa () +and +.BR strndupa () +are similar, but use +.BR alloca (3) +to allocate the buffer. +.SH RETURN VALUE +On success, the +.BR strdup () +function returns a pointer to the duplicated +string. +It returns NULL if insufficient memory was available, with +.I errno +set to indicate the error. +.SH ERRORS +.TP +.B ENOMEM +Insufficient memory available to allocate duplicate string. +.SH ATTRIBUTES +For an explanation of the terms used in this section, see +.BR attributes (7). +.TS +allbox; +lbx lb lb +l l l. +Interface Attribute Value +T{ +.na +.nh +.BR strdup (), +.BR strndup (), +.BR strdupa (), +.BR strndupa () +T} Thread safety MT-Safe +.TE +.SH STANDARDS +.TP +.BR strdup () +.TQ +.BR strndup () +POSIX.1-2008. +.TP +.BR strdupa () +.TQ +.BR strndupa () +GNU. +.SH HISTORY +.TP +.BR strdup () +SVr4, 4.3BSD-Reno, POSIX.1-2001. +.TP +.BR strndup () +POSIX.1-2008. +.TP +.BR strdupa () +.TQ +.BR strndupa () +GNU. +.SH SEE ALSO +.BR alloca (3), +.BR calloc (3), +.BR free (3), +.BR malloc (3), +.BR realloc (3), +.BR string (3), +.BR wcsdup (3) |