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Name

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 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 (aq\0aq) 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

Errors

ENOMEM

Insufficient memory available to allocate duplicate string.

Conforming to

See Also

Colophon

Table of Contents

• Name
• Synopsis
• Description
• Return Value
• Errors
• Conforming to
• See Also
• Colophon