mirror of
https://github.com/VCMP-SqMod/SqMod.git
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70e5f0ba21
Also enabled the latest C++ revision in the project. Replaced the Random library with the one provided by C++11. Implemented a simple AES256 encryption class. Various other fixes and improvements.
168 lines
6.3 KiB
C
168 lines
6.3 KiB
C
#include <stdlib.h>
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#include <string.h>
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/* *INDENT-OFF* */
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/* The memmem, strdup, and strndup functions were all copied from the
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* FreeBSD source, along with the relevant copyright notice.
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*
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* It'd be nicer to simply use the functions available on the system if they
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* exist, but there doesn't seem to be a good way to detect them without also
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* defining things like _GNU_SOURCE, which we want to avoid, because then we
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* end up _accidentally_ using GNU features without noticing, which then
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* breaks on systems like OSX.
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*
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* C is fun! */
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/* Applies to memmem implementation */
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/*-
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* Copyright (c) 2005 Pascal Gloor <pascal.gloor@spale.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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static void *
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mmdb_memmem(const void *l, size_t l_len, const void *s, size_t s_len)
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{
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register char *cur, *last;
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const char *cl = (const char *)l;
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const char *cs = (const char *)s;
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/* we need something to compare */
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if (l_len == 0 || s_len == 0)
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return NULL;
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/* "s" must be smaller or equal to "l" */
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if (l_len < s_len)
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return NULL;
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/* special case where s_len == 1 */
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if (s_len == 1)
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return memchr(l, (int)*cs, l_len);
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/* the last position where its possible to find "s" in "l" */
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last = (char *)cl + l_len - s_len;
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for (cur = (char *)cl; cur <= last; cur++)
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if (cur[0] == cs[0] && memcmp(cur, cs, s_len) == 0)
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return cur;
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return NULL;
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}
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/* Applies to strnlen implementation */
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/*-
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* Copyright (c) 2009 David Schultz <das@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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static size_t
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mmdb_strnlen(const char *s, size_t maxlen)
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{
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size_t len;
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for (len = 0; len < maxlen; len++, s++) {
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if (!*s)
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break;
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}
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return (len);
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}
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/* Applies to strdup and strndup implementation */
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/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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static char *
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mmdb_strdup(const char *str)
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{
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size_t len;
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char *copy;
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len = strlen(str) + 1;
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if ((copy = malloc(len)) == NULL)
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return (NULL);
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memcpy(copy, str, len);
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return (copy);
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}
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static char *
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mmdb_strndup(const char *str, size_t n)
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{
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size_t len;
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char *copy;
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len = mmdb_strnlen(str, n);
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if ((copy = malloc(len + 1)) == NULL)
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return (NULL);
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memcpy(copy, str, len);
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copy[len] = '\0';
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return (copy);
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}
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/* *INDENT-ON* */
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