From e90b72ec3082588b296956730bd2930cf8d5d671 Mon Sep 17 00:00:00 2001 From: Richard Qin Date: Fri, 10 Jul 2026 11:31:46 +0800 Subject: refactor: promote new architecture to repository root Archive the deprecated implementation under lume-legacy, make the new kernel the default root-level build, and update repository entry points without changing kernel behavior. --- lib/string/stpncpy.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 lib/string/stpncpy.c (limited to 'lib/string/stpncpy.c') diff --git a/lib/string/stpncpy.c b/lib/string/stpncpy.c new file mode 100644 index 0000000..ca2ef78 --- /dev/null +++ b/lib/string/stpncpy.c @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: MIT */ +/* Derived from musl libc (Copyright © 2005-2020 Rich Felker, et al.) */ + +#include +#include +#include + +#define ALIGN (sizeof(size_t)-1) +#define ONES ((size_t)-1/UCHAR_MAX) +#define HIGHS (ONES * (UCHAR_MAX/2+1)) +#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS) + +char *__stpncpy(char *restrict d, const char *restrict s, size_t n) +{ +#ifdef __GNUC__ + typedef size_t __attribute__((__may_alias__)) word; + word *wd; + const word *ws; + if (((uintptr_t)s & ALIGN) == ((uintptr_t)d & ALIGN)) { + for (; ((uintptr_t)s & ALIGN) && n && (*d=*s); n--, s++, d++); + if (!n || !*s) goto tail; + wd=(void *)d; ws=(const void *)s; + for (; n>=sizeof(size_t) && !HASZERO(*ws); + n-=sizeof(size_t), ws++, wd++) *wd = *ws; + d=(void *)wd; s=(const void *)ws; + } +#endif + for (; n && (*d=*s); n--, s++, d++); +tail: + memset(d, 0, n); + return d; +} + +weak_alias(__stpncpy, stpncpy); + -- cgit v1.2.3