strdup man page on Debian

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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():
	   Since glibc 2.12:
	       _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
	       _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED ||
	       _POSIX_C_SOURCE >= 200809L
	   Before glibc 2.12:
	       _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
	       _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
       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  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 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),  string(3),  wcs‐
       dup(3)

COLOPHON
       This  page  is  part of release 3.27 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				  2010-09-15			     STRDUP(3)
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