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Linux 2.6 - man page for strdup (linux section 3)

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 characters. If s is longer than n, only n char- acters 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 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 avail- able.
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), wcsdup(3)
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and informa- tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.
GNU
2010-09-15 STRDUP(3)


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