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strdup(3) Library Functions Manual strdup(3)
NAME
strdup, strndup, strdupa, strndupa - duplicate a string
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
#include <string.h>
char *strdup(const char *s);
char *strndup(const char s[.n], size_t n);
char *strdupa(const char *s);
char *strndupa(const char s[.n], size_t n);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
strdup():
_XOPEN_SOURCE >= 500
|| /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
strndup():
Since glibc 2.10:
_POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
_GNU_SOURCE
strdupa(), strndupa():
_GNU_SOURCE
DESCRIPTION
The strdup() function returns a pointer to a new string which is a du-
plicate 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.
RETURN VALUE
On success, the strdup() function returns a pointer to the duplicated
string. It returns NULL if insufficient memory was available, with er-
rno set to indicate the error.
ERRORS
ENOMEM Insufficient memory available to allocate duplicate string.
ATTRIBUTES
For an explanation of the terms used in this section, see at-
tributes(7).
+--------------------------------------------+---------------+---------+
|Interface | Attribute | Value |
+--------------------------------------------+---------------+---------+
|strdup(), strndup(), strdupa(), strndupa() | Thread safety | MT-Safe |
+--------------------------------------------+---------------+---------+
STANDARDS
strdup()
strndup()
POSIX.1-2008.
strdupa()
strndupa()
GNU.
HISTORY
strdup()
SVr4, 4.3BSD-Reno, POSIX.1-2001.
strndup()
POSIX.1-2008.
strdupa()
strndupa()
GNU.
SEE ALSO
alloca(3), calloc(3), free(3), malloc(3), realloc(3), string(3), wcs-
dup(3)
Linux man-pages 6.04 2023-03-30 strdup(3)
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