From 4f5791ebd03eaec1c7da0865a383175b05102712 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 5 May 2024 19:47:29 +0200 Subject: Adding upstream version 2:4.17.12+dfsg. Signed-off-by: Daniel Baumann --- third_party/heimdal/lib/roken/memmem.c | 72 ++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 third_party/heimdal/lib/roken/memmem.c (limited to 'third_party/heimdal/lib/roken/memmem.c') diff --git a/third_party/heimdal/lib/roken/memmem.c b/third_party/heimdal/lib/roken/memmem.c new file mode 100644 index 0000000..3f9c6bc --- /dev/null +++ b/third_party/heimdal/lib/roken/memmem.c @@ -0,0 +1,72 @@ +/* + * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * 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. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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 +#include +#include + +#ifndef HAVE_MEMMEM +#include "roken.h" +ROKEN_LIB_FUNCTION void * ROKEN_LIB_CALL +memmem(const void *haystack, + size_t haystacklen, + const void *needle, + size_t needlelen) +{ + const unsigned char *hs = haystack; + const unsigned char *n = needle; + size_t hsi, ni; + + if (haystacklen < needlelen || haystacklen == 0) + return NULL; + /* + * Imagine a haystack of length 5 and needle of length 2, then the largest + * index in the haystack at which we can bother looking for the needle is: + * + * 0 1 2 3 4 + * +---------+ + * |?|?|?|?|?| + * +---------+ + * ^ + * \ + * here, at index 3, which is 5 - 2, and less than (5 - 2 + 1). + */ + for (hsi = 0, ni = 0; hsi < (haystacklen - needlelen + 1); hsi++, ni = 0) { + while (ni < needlelen && n[ni] == hs[hsi + ni]) + ni++; + if (ni == needlelen) + return rk_UNCONST(&hs[hsi]); + } + return NULL; +} +#endif -- cgit v1.2.3