ZealOS/zealbooter/lib/strncpy.c

/* strncpy( char *, const char *, size_t )
   This file is part of the Public Domain C Library (PDCLib).
   Permission is granted to use, modify, and / or redistribute at will.
*/

#include <stddef.h>


char *strncpy(char *s1, const char *s2, size_t n)
{
    char *rc = s1;

    while (n && (*s1++ = *s2++))
    {
        /* Cannot do "n--" in the conditional as size_t is unsigned and we have
           to check it again for >0 in the next loop below, so we must not risk
           underflow.
        */
        --n;
    }

    /* Checking against 1 as we missed the last --n in the loop above. */
    while (n-- > 1)
    {
        *s1++ = '\0';
    }

    return rc;
}