debian man page for strdup

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 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
	   || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
       strndup():
	   Since glibc 2.10:
	       POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700
	   Before glibc 2.10:
	       _GNU_SOURCE
       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 bytes.  If s is longer than n, only n bytes are copied, and a terminating null
       byte ('') 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() 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), wcsdup(3)

COLOPHON
       This page is part of release 3.44 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
								    2012-05-10								 STRDUP(3)