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https://github.com/tursodatabase/libsql.git
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d3a156caf5
A common complain with libSQL is how to run extensions. The main mechanism, with a .so, has a lot of issues around how those .so are distributed. The most common extensions are the ones in the sqlean package. We can improve this experience by bundling them in our sqlite build. Not all SQLean extensions are kosher: some of them, like fileio, use the vfs. Others, are deemed too complex. The extensions included here are a subset that we deem important enough, and low risk enough, to just be a part of the main bundle.
238 lines
6.0 KiB
C
238 lines
6.0 KiB
C
/*************************************************
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* Perl-Compatible Regular Expressions *
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*************************************************/
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/* PCRE is a library of functions to support regular expressions whose syntax
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and semantics are as close as possible to those of the Perl 5 language.
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Written by Philip Hazel
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Original API code Copyright (c) 1997-2012 University of Cambridge
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New API code Copyright (c) 2018-2021 University of Cambridge
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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 are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* 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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* Neither the name of the University of Cambridge nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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-----------------------------------------------------------------------------
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*/
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/* This module contains internal functions for comparing and finding the length
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of strings. These are used instead of strcmp() etc because the standard
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functions work only on 8-bit data. */
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#ifdef HAVE_CONFIG_H
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#include "regexp/pcre2/config.h"
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#endif
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#include "regexp/pcre2/pcre2_internal.h"
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/*************************************************
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* Emulated memmove() for systems without it *
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*************************************************/
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/* This function can make use of bcopy() if it is available. Otherwise do it by
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steam, as there some non-Unix environments that lack both memmove() and
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bcopy(). */
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#if !defined(VPCOMPAT) && !defined(HAVE_MEMMOVE)
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void *
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PRIV(memmove)(void *d, const void *s, size_t n)
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{
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#ifdef HAVE_BCOPY
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bcopy(s, d, n);
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return d;
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#else
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size_t i;
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unsigned char *dest = (unsigned char *)d;
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const unsigned char *src = (const unsigned char *)s;
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if (dest > src)
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{
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dest += n;
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src += n;
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for (i = 0; i < n; ++i) *(--dest) = *(--src);
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return (void *)dest;
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}
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else
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{
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for (i = 0; i < n; ++i) *dest++ = *src++;
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return (void *)(dest - n);
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}
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#endif /* not HAVE_BCOPY */
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}
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#endif /* not VPCOMPAT && not HAVE_MEMMOVE */
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/*************************************************
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* Compare two zero-terminated PCRE2 strings *
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*************************************************/
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/*
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Arguments:
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str1 first string
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str2 second string
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Returns: 0, 1, or -1
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*/
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int
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PRIV(strcmp)(PCRE2_SPTR str1, PCRE2_SPTR str2)
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{
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PCRE2_UCHAR c1, c2;
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while (*str1 != '\0' || *str2 != '\0')
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{
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c1 = *str1++;
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c2 = *str2++;
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if (c1 != c2) return ((c1 > c2) << 1) - 1;
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}
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return 0;
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}
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/*************************************************
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* Compare zero-terminated PCRE2 & 8-bit strings *
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*************************************************/
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/* As the 8-bit string is almost always a literal, its type is specified as
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const char *.
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Arguments:
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str1 first string
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str2 second string
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Returns: 0, 1, or -1
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*/
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int
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PRIV(strcmp_c8)(PCRE2_SPTR str1, const char *str2)
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{
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PCRE2_UCHAR c1, c2;
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while (*str1 != '\0' || *str2 != '\0')
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{
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c1 = *str1++;
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c2 = *str2++;
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if (c1 != c2) return ((c1 > c2) << 1) - 1;
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}
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return 0;
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}
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/*************************************************
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* Compare two PCRE2 strings, given a length *
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*************************************************/
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/*
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Arguments:
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str1 first string
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str2 second string
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len the length
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Returns: 0, 1, or -1
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*/
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int
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PRIV(strncmp)(PCRE2_SPTR str1, PCRE2_SPTR str2, size_t len)
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{
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PCRE2_UCHAR c1, c2;
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for (; len > 0; len--)
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{
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c1 = *str1++;
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c2 = *str2++;
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if (c1 != c2) return ((c1 > c2) << 1) - 1;
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}
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return 0;
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}
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/*************************************************
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* Compare PCRE2 string to 8-bit string by length *
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*************************************************/
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/* As the 8-bit string is almost always a literal, its type is specified as
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const char *.
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Arguments:
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str1 first string
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str2 second string
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len the length
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Returns: 0, 1, or -1
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*/
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int
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PRIV(strncmp_c8)(PCRE2_SPTR str1, const char *str2, size_t len)
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{
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PCRE2_UCHAR c1, c2;
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for (; len > 0; len--)
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{
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c1 = *str1++;
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c2 = *str2++;
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if (c1 != c2) return ((c1 > c2) << 1) - 1;
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}
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return 0;
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}
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/*************************************************
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* Find the length of a PCRE2 string *
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*************************************************/
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/*
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Argument: the string
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Returns: the length
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*/
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PCRE2_SIZE
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PRIV(strlen)(PCRE2_SPTR str)
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{
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PCRE2_SIZE c = 0;
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while (*str++ != 0) c++;
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return c;
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}
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/*************************************************
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* Copy 8-bit 0-terminated string to PCRE2 string *
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*************************************************/
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/* Arguments:
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str1 buffer to receive the string
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str2 8-bit string to be copied
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Returns: the number of code units used (excluding trailing zero)
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*/
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PCRE2_SIZE
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PRIV(strcpy_c8)(PCRE2_UCHAR *str1, const char *str2)
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{
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PCRE2_UCHAR *t = str1;
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while (*str2 != 0) *t++ = *str2++;
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*t = 0;
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return t - str1;
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}
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/* End of pcre2_string_utils.c */
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