STRDUP(3) Linux Programmer's Manual STRDUP(3)NAME
strdup, strndup, strdupa, strndupa - duplicate a string
SYNOPSIS
#include <string.h>
char *strdup(const char *s);
char *strndup(const char *s, size_t n);
char *strdupa(const char *s);
char *strndupa(const char *s, size_t n);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
strdup(): _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 500
strndup(), strdupa(), strndupa(): _GNU_SOURCE
DESCRIPTION
The strdup() function returns a pointer to a new string which is a
duplicate of the string s. Memory for the new string is obtained with
malloc(3), and can be freed with free(3).
The strndup() function is similar, but only copies at most n charac‐
ters. If s is longer than n, only n characters are copied, and a ter‐
minating null byte ('\0') is added.
strdupa() and strndupa() are similar, but use alloca(3) to allocate the
buffer. They are only available when using the GNU GCC suite, and suf‐
fer from the same limitations described in alloca(3).
RETURN VALUE
The strdup() function returns a pointer to the duplicated string, or
NULL if insufficient memory was available.
ERRORS
ENOMEM Insufficient memory available to allocate duplicate string.
CONFORMING TOstrdup() conforms to SVr4, 4.3BSD, POSIX.1-2001. strndup(), strdupa(),
and strndupa() are GNU extensions.
SEE ALSOalloca(3), calloc(3), free(3), malloc(3), realloc(3), wcsdup(3)COLOPHON
This page is part of release 3.22 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU 2007-07-26 STRDUP(3)
