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():

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 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 suffer 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), wcsdup(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/.