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strdup(3) [linux man page]

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 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), 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 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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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)

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