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 characters.  If s is longer than n, only  n  characters  are
       copied, and a terminating 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 suffer 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 TO
       strdup() conforms to SVr4, 4.3BSD, POSIX.1-2001.  strndup(), strdupa(), and strndupa() are GNU extensions.

SEE ALSO
       alloca(3), calloc(3), free(3), malloc(3), realloc(3), wcsdup(3)

COLOPHON
       This page is part of release 3.25 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)