strdup(3) [netbsd man page]

STRDUP(3)						   BSD Library Functions Manual 						 STRDUP(3)

NAME

     strdup, strndup -- save a copy of a string

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <string.h>

     char *
     strdup(const char *str);

     char *
     strndup(const char *str, size_t len);

DESCRIPTION

     The strdup() function allocates sufficient memory for a copy of the string str, does the copy, and returns a pointer to it.  The pointer may
     subsequently be used as an argument to the function free(3).

     If insufficient memory is available, NULL is returned.

     The strndup() function copies at most len characters from the string str always NUL terminating the copied string.

EXAMPLES

     The following will point p to an allocated area of memory containing the nul-terminated string "foobar":

	   char *p;

	   if ((p = strdup("foobar")) == NULL) {
		   fprintf(stderr, "Out of memory.
");
		   exit(1);
	   }

ERRORS

     The strdup() function may fail and set the external variable errno for any of the errors specified for the library function malloc(3).

SEE ALSO

     free(3), malloc(3), strcpy(3), strlen(3)

STANDARDS

     The strdup() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY

     The strdup() function first appeared in 4.4BSD.  The strndup() function was added in NetBSD 4.0.

BSD
								 January 28, 2009							       BSD

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 termi-
       nating 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(), 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)