strncpy.c

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#include <string.h>
 
char *strncpy(char * __restrict dst, const char * __restrict src, size_t n) {
  if (n != 0) {
    char *d = dst;
    const char *s = src;
 
    do {
      if ((*d++ = *s++) == 0) {
        /* NUL pad the remaining n-1 bytes */
        while (--n != 0)
          *d++ = 0;
        break;
      }
    } while (--n != 0);
  }
  return (dst);
}