msvc/Windows Kits/10/Source/10.0.26100.0/ucrt/string/strncpy.c

/***
*strncpy.c - copy at most n characters of string
*
*       Copyright (c) Microsoft Corporation. All rights reserved.
*
*Purpose:
*       defines strncpy() - copy at most n characters of string
*
*******************************************************************************/

#include <string.h>

#if defined _M_ARM
    #pragma function(strncpy)
#endif

/***
*char *strncpy(dest, source, count) - copy at most n characters
*
*Purpose:
*       Copies count characters from the source string to the
*       destination.  If count is less than the length of source,
*       NO NULL CHARACTER is put onto the end of the copied string.
*       If count is greater than the length of sources, dest is padded
*       with null characters to length count.
*
*
*Entry:
*       char *dest - pointer to destination
*       char *source - source string for copy
*       unsigned count - max number of characters to copy
*
*Exit:
*       returns dest
*
*Exceptions:
*
*******************************************************************************/

#pragma function(memcpy, memset)

char * __cdecl strncpy (
        char * dest,
        const char * source,
        size_t count
        )
{
        size_t srclen = strnlen(source, count);
        memcpy(dest, source, srclen);
        if (srclen < count)
        {
                memset(dest + srclen, 0, count - srclen);
        }
        return(dest);
}