##### cppreference.com

##### Search

Create account

##### Namespaces

- Page
- Discussion

##### Variants

##### Views

- View
- Edit
- History

##### Actions

# std::strncpy

From cppreference.com
< cpp‎ | string‎ | byte

Defined in header `<cstring>` |  |
char *strncpy( char *dest, const char *src, std::size_t count ); |  |

Copies at most `count` characters of the byte string pointed to by `src` (including the terminating null character) to character array pointed to by `dest`.

If `count` is reached before the entire string `src` was copied, the resulting character array is not null-terminated.

If, after copying the terminating null character from `src`, `count` is not reached, additional null characters are written to `dest` until the total of `count` characters have been written.

If the strings overlap, the behavior is undefined.

### [edit] Parameters

dest | - | pointer to the character array to copy to
src | - | pointer to the byte string to copy from
count | - | maximum number of characters to copy

### [edit] Return value

`dest`

### [edit] Example

Run this code

    #include <iostream>
    #include <cstring>

    int main()
    {
        const char* src = "hi";
        char dest[6] = {'a', 'b', 'c', 'd', 'e', 'f'};
        std::strncpy(dest, src, 5);

        std::cout << "The contents of dest are: ";
        for (char c : dest) {
            if (c) {
                std::cout << c << ' ';
            } else {
                std::cout << "\\0" << ' ';
            }
        }
        std::cout << '\n';
    }

Output:

    The contents of dest are: h i \0 \0 \0 f

### [edit] See also

strcpy | copies one string to another (function) [edit]
memcpy | copies one buffer to another (function) [edit]
C documentation for strncpy

Retrieved from "http://en.cppreference.com/mwiki/index.php?title=cpp/string/byte/strncpy&oldid=77587"