STRDUP(3) Linux Programmer's Manual STRDUP(3)

NAME
       strdup, strndup, strdupa, strndupa - duplicate a string

SYNOPSIS
       #include 

       char *strdup(const char *s);

       char *strndup(const char *s, sizet n);
       char *strdupa(const char *s);
       char *strndupa(const char *s, sizet n);

   Feature Test Macro Requirements for glibc (see featuretestmacros(7)):

       strdup():
           SVIDSOURCE || BSDSOURCE || XOPENSOURCE >= 500 ||
           XOPENSOURCE && XOPENSOURCEEXTENDED
           || /* Since glibc 2.12: */ POSIXCSOURCE >= 200809L
       strndup():
           Since glibc 2.10:
               POSIXCSOURCE >= 200809L || XOPENSOURCE >= 700
           Before glibc 2.10:
               GNUSOURCE
       strdupa(), strndupa(): GNUSOURCE

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 copies at most n bytes.  If s is
       longer  than  n,  only  n bytes 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 available only when using the GNU GCC suite, and suf‐
       fer from the same limitations described in alloca(3).

RETURN VALUE
       On success, the strdup() function returns a pointer to  the  duplicated
       string.   It  returns  NULL  if insufficient memory was available, with
       errno set to indicate the cause of the error.

ERRORS
       ENOMEM Insufficient memory available to allocate duplicate string.

CONFORMING TO
       strdup() conforms to SVr4, 4.3BSD, POSIX.1-2001.  strndup() conforms to
       POSIX.1-2008.  strdupa() and strndupa() are GNU extensions.

SEE ALSO
       alloca(3),  calloc(3),  free(3), malloc(3), realloc(3), string(3), wcs‐
       dup(3)

COLOPHON
       This page is part of release 3.53 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                               2013-04-19                         STRDUP(3)