From 199767f8919635c4928607450d9e0abb932109ce Mon Sep 17 00:00:00 2001 From: Toomas Soome Date: Sun, 25 Oct 2015 00:06:51 +0300 Subject: 5061 freebsd boot loader integration (loader project) Reviewed by: Richard Lowe Reviewed by: Cody Mello Approved by: Robert Mustacchi --- usr/src/boot/lib/libc/string/strspn.c | 71 +++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 usr/src/boot/lib/libc/string/strspn.c (limited to 'usr/src/boot/lib/libc/string/strspn.c') diff --git a/usr/src/boot/lib/libc/string/strspn.c b/usr/src/boot/lib/libc/string/strspn.c new file mode 100644 index 0000000000..5dbac0a678 --- /dev/null +++ b/usr/src/boot/lib/libc/string/strspn.c @@ -0,0 +1,71 @@ +/*- + * Copyright (c) 2005 David Schultz + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include +__FBSDID("$FreeBSD$"); + +#include +#include +#include + +#define IDX(c) ((u_char)(c) / LONG_BIT) +#define BIT(c) ((u_long)1 << ((u_char)(c) % LONG_BIT)) + +size_t +strspn(const char *s, const char *charset) +{ + /* + * NB: idx and bit are temporaries whose use causes gcc 3.4.2 to + * generate better code. Without them, gcc gets a little confused. + */ + const char *s1; + u_long bit; + u_long tbl[(UCHAR_MAX + 1) / LONG_BIT]; + int idx; + + if(*s == '\0') + return (0); + +#if LONG_BIT == 64 /* always better to unroll on 64-bit architectures */ + tbl[3] = tbl[2] = tbl[1] = tbl[0] = 0; +#else + for (idx = 0; idx < sizeof(tbl) / sizeof(tbl[0]); idx++) + tbl[idx] = 0; +#endif + for (; *charset != '\0'; charset++) { + idx = IDX(*charset); + bit = BIT(*charset); + tbl[idx] |= bit; + } + + for(s1 = s; ; s1++) { + idx = IDX(*s1); + bit = BIT(*s1); + if ((tbl[idx] & bit) == 0) + break; + } + return (s1 - s); +} -- cgit v1.2.3