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## 3.153 strncpy

> Function

>   Copy part of a string.

> Header

>   `string.h`

> Declaration

>   `char* __fastcall__ strcpy (char* s1, const char* s2, size_t n);`

> Description

>   The `strncpy` function copies not more than n bytes from the array pointed to by `s2` to the array pointed to by `s1`. If the array pointed to by `s2` is a string that is shorter than n bytes, null bytes are appended to the copy in the array pointed to by `s1`, until `n` bytes are written. The function will always return `s1`.

> Limits

>   - The function is only available as fastcall function, so it may only be used in presence of a prototype. If there is no null byte in the first `n` bytes of the array pointed to by `s2`, the result is not null-terminated.
>   - If copying takes place between objects that overlap, the behaviour is undefined.
> Availability

>   ISO 9899

> See also

>   strcat, strcpy, strncat

> Example

>       #include <string.h>

>       static char hello[6];

>       strcpy (hello, "Hello world!\n", sizeof (hello) - 1);
>       hello[5] = '\0';

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