strdup

Synopsis

#include <string.h>

char *strdup(const char *s);

char *strndup(const char *s, size_t size);

Status

Partially implemented

Conformance

IEEE Std 1003.1-2017

Description

The strdup() function shall return a pointer to a new string, which is a duplicate of the string pointed to by s. The returned pointer can be passed to free(). A null pointer is returned if the new string cannot be created.

The strndup() function shall be equivalent to the strdup() function, duplicating the provided s in a new block of memory allocated as if by using malloc(), with the exception being that strndup() copies at most size plus one byte into the newly allocated memory, terminating the new string with a NUL character.

If the length of s is larger than size, only size bytes shall be duplicated.

If size is larger than the length of s, all bytes in s shall be copied into the new memory buffer, including the terminating NUL character.

The newly created string shall always be properly terminated.

Return value

The strdup() function shall return a pointer to a new string on success. Otherwise, it shall return a null pointer and set errno to indicate the error.

Upon successful completion, the strndup() function shall return a pointer to the newly allocated memory containing the duplicated string. Otherwise, it shall return a null pointer and set errno to indicate the error.

Errors

These functions shall fail if:

• [ENOMEM] - Storage space available is insufficient.

Tests

Tested

Known bugs

None

See Also

1. Standard library functions

2. Table of Contents