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/strcspn.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 lib/string/strcspn.c (limited to 'lib/string/strcspn.c') diff --git a/lib/string/strcspn.c b/lib/string/strcspn.c new file mode 100644 index 0000000..ba55fe6 --- /dev/null +++ b/lib/string/strcspn.c @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: MIT */ +/* Derived from musl libc (Copyright © 2005-2020 Rich Felker, et al.) */ + +#include + +#define BITOP(a,b,op) \ + ((a)[(size_t)(b)/(8*sizeof *(a))] op (size_t)1<<((size_t)(b)%(8*sizeof *(a)))) + +size_t strcspn(const char *s, const char *c) +{ + const char *a = s; + size_t byteset[32/sizeof(size_t)]; + + if (!c[0] || !c[1]) return __strchrnul(s, *c)-a; + + memset(byteset, 0, sizeof byteset); + for (; *c && BITOP(byteset, *(unsigned char *)c, |=); c++); + for (; *s && !BITOP(byteset, *(unsigned char *)s, &); s++); + return s-a; +} -- cgit v1.2.3