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pcre2_internal.h
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/*************************************************
* Perl-Compatible Regular Expressions *
*************************************************/
/* PCRE2 is a library of functions to support regular expressions whose syntax
and semantics are as close as possible to those of the Perl 5 language.
Written by Philip Hazel
Original API code Copyright (c) 1997-2012 University of Cambridge
New API code Copyright (c) 2016-2019 University of Cambridge
-----------------------------------------------------------------------------
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* 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.
* Neither the name of the University of Cambridge 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
-----------------------------------------------------------------------------
*/
#ifndef PCRE2_INTERNAL_H_IDEMPOTENT_GUARD
#define PCRE2_INTERNAL_H_IDEMPOTENT_GUARD
/* We do not support both EBCDIC and Unicode at the same time. The "configure"
script prevents both being selected, but not everybody uses "configure". EBCDIC
is only supported for the 8-bit library, but the check for this has to be later
in this file, because the first part is not width-dependent, and is included by
pcre2test.c with CODE_UNIT_WIDTH == 0. */
#if defined EBCDIC && defined SUPPORT_UNICODE
#error The use of both EBCDIC and SUPPORT_UNICODE is not supported.
#endif
/* Standard C headers */
#include <ctype.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Macros to make boolean values more obvious. The #ifndef is to pacify
compiler warnings in environments where these macros are defined elsewhere.
Unfortunately, there is no way to do the same for the typedef. */
typedef int BOOL;
#ifndef FALSE
#define FALSE 0
#define TRUE 1
#endif
/* Valgrind (memcheck) support */
#ifdef SUPPORT_VALGRIND
#include <valgrind/memcheck.h>
#endif
/* Older versions of MSVC lack snprintf(). This define allows for
warning/error-free compilation and testing with MSVC compilers back to at least
MSVC 10/2010. Except for VC6 (which is missing some fundamentals and fails). */
#if defined(_MSC_VER) && (_MSC_VER < 1900)
#define snprintf _snprintf
#endif
/* When compiling a DLL for Windows, the exported symbols have to be declared
using some MS magic. I found some useful information on this web page:
http://msdn2.microsoft.com/en-us/library/y4h7bcy6(VS.80).aspx. According to the
information there, using __declspec(dllexport) without "extern" we have a
definition; with "extern" we have a declaration. The settings here override the
setting in pcre2.h (which is included below); it defines only PCRE2_EXP_DECL,
which is all that is needed for applications (they just import the symbols). We
use:
PCRE2_EXP_DECL for declarations
PCRE2_EXP_DEFN for definitions
The reason for wrapping this in #ifndef PCRE2_EXP_DECL is so that pcre2test,
which is an application, but needs to import this file in order to "peek" at
internals, can #include pcre2.h first to get an application's-eye view.
In principle, people compiling for non-Windows, non-Unix-like (i.e. uncommon,
special-purpose environments) might want to stick other stuff in front of
exported symbols. That's why, in the non-Windows case, we set PCRE2_EXP_DEFN
only if it is not already set. */
#ifndef PCRE2_EXP_DECL
# ifdef _WIN32
# ifndef PCRE2_STATIC
# define PCRE2_EXP_DECL extern __declspec(dllexport)
# define PCRE2_EXP_DEFN __declspec(dllexport)
# else
# define PCRE2_EXP_DECL extern
# define PCRE2_EXP_DEFN
# endif
# else
# ifdef __cplusplus
# define PCRE2_EXP_DECL extern "C"
# else
# define PCRE2_EXP_DECL extern
# endif
# ifndef PCRE2_EXP_DEFN
# define PCRE2_EXP_DEFN PCRE2_EXP_DECL
# endif
# endif
#endif
/* Include the public PCRE2 header and the definitions of UCP character
property values. This must follow the setting of PCRE2_EXP_DECL above. */
#include "pcre2.h"
#include "pcre2_ucp.h"
/* When PCRE2 is compiled as a C++ library, the subject pointer can be replaced
with a custom type. This makes it possible, for example, to allow pcre2_match()
to process subject strings that are discontinuous by using a smart pointer
class. It must always be possible to inspect all of the subject string in
pcre2_match() because of the way it backtracks. */
/* WARNING: This is as yet untested for PCRE2. */
#ifdef CUSTOM_SUBJECT_PTR
#undef PCRE2_SPTR
#define PCRE2_SPTR CUSTOM_SUBJECT_PTR
#endif
/* When checking for integer overflow in pcre2_compile(), we need to handle
large integers. If a 64-bit integer type is available, we can use that.
Otherwise we have to cast to double, which of course requires floating point
arithmetic. Handle this by defining a macro for the appropriate type. */
#if defined INT64_MAX || defined int64_t
#define INT64_OR_DOUBLE int64_t
#else
#define INT64_OR_DOUBLE double
#endif
/* External (in the C sense) functions and tables that are private to the
libraries are always referenced using the PRIV macro. This makes it possible
for pcre2test.c to include some of the source files from the libraries using a
different PRIV definition to avoid name clashes. It also makes it clear in the
code that a non-static object is being referenced. */
#ifndef PRIV
#define PRIV(name) _pcre2_##name
#endif
/* When compiling for use with the Virtual Pascal compiler, these functions
need to have their names changed. PCRE2 must be compiled with the -DVPCOMPAT
option on the command line. */
#ifdef VPCOMPAT
#define strlen(s) _strlen(s)
#define strncmp(s1,s2,m) _strncmp(s1,s2,m)
#define memcmp(s,c,n) _memcmp(s,c,n)
#define memcpy(d,s,n) _memcpy(d,s,n)
#define memmove(d,s,n) _memmove(d,s,n)
#define memset(s,c,n) _memset(s,c,n)
#else /* VPCOMPAT */
/* Otherwise, to cope with SunOS4 and other systems that lack memmove(), define
a macro that calls an emulating function. */
#ifndef HAVE_MEMMOVE
#undef memmove /* Some systems may have a macro */
#define memmove(a, b, c) PRIV(memmove)(a, b, c)
#endif /* not HAVE_MEMMOVE */
#endif /* not VPCOMPAT */
/* This is an unsigned int value that no UTF character can ever have, as
Unicode doesn't go beyond 0x0010ffff. */
#define NOTACHAR 0xffffffff
/* This is the largest valid UTF/Unicode code point. */
#define MAX_UTF_CODE_POINT 0x10ffff
/* Compile-time positive error numbers (all except UTF errors, which are
negative) start at this value. It should probably never be changed, in case
some application is checking for specific numbers. There is a copy of this
#define in pcre2posix.c (which now no longer includes this file). Ideally, a
way of having a single definition should be found, but as the number is
unlikely to change, this is not a pressing issue. The original reason for
having a base other than 0 was to keep the absolute values of compile-time and
run-time error numbers numerically different, but in the event the code does
not rely on this. */
#define COMPILE_ERROR_BASE 100
/* The initial frames vector for remembering backtracking points in
pcre2_match() is allocated on the system stack, of this size (bytes). The size
must be a multiple of sizeof(PCRE2_SPTR) in all environments, so making it a
multiple of 8 is best. Typical frame sizes are a few hundred bytes (it depends
on the number of capturing parentheses) so 20KiB handles quite a few frames. A
larger vector on the heap is obtained for patterns that need more frames. The
maximum size of this can be limited. */
#define START_FRAMES_SIZE 20480
/* Similarly, for DFA matching, an initial internal workspace vector is
allocated on the stack. */
#define DFA_START_RWS_SIZE 30720
/* Define the default BSR convention. */
#ifdef BSR_ANYCRLF
#define BSR_DEFAULT PCRE2_BSR_ANYCRLF
#else
#define BSR_DEFAULT PCRE2_BSR_UNICODE
#endif
/* ---------------- Basic UTF-8 macros ---------------- */
/* These UTF-8 macros are always defined because they are used in pcre2test for
handling wide characters in 16-bit and 32-bit modes, even if an 8-bit library
is not supported. */
/* Tests whether a UTF-8 code point needs extra bytes to decode. */
#define HASUTF8EXTRALEN(c) ((c) >= 0xc0)
/* The following macros were originally written in the form of loops that used
data from the tables whose names start with PRIV(utf8_table). They were
rewritten by a user so as not to use loops, because in some environments this
gives a significant performance advantage, and it seems never to do any harm.
*/
/* Base macro to pick up the remaining bytes of a UTF-8 character, not
advancing the pointer. */
#define GETUTF8(c, eptr) \
{ \
if ((c & 0x20u) == 0) \
c = ((c & 0x1fu) << 6) | (eptr[1] & 0x3fu); \
else if ((c & 0x10u) == 0) \
c = ((c & 0x0fu) << 12) | ((eptr[1] & 0x3fu) << 6) | (eptr[2] & 0x3fu); \
else if ((c & 0x08u) == 0) \
c = ((c & 0x07u) << 18) | ((eptr[1] & 0x3fu) << 12) | \
((eptr[2] & 0x3fu) << 6) | (eptr[3] & 0x3fu); \
else if ((c & 0x04u) == 0) \
c = ((c & 0x03u) << 24) | ((eptr[1] & 0x3fu) << 18) | \
((eptr[2] & 0x3fu) << 12) | ((eptr[3] & 0x3fu) << 6) | \
(eptr[4] & 0x3fu); \
else \
c = ((c & 0x01u) << 30) | ((eptr[1] & 0x3fu) << 24) | \
((eptr[2] & 0x3fu) << 18) | ((eptr[3] & 0x3fu) << 12) | \
((eptr[4] & 0x3fu) << 6) | (eptr[5] & 0x3fu); \
}
/* Base macro to pick up the remaining bytes of a UTF-8 character, advancing
the pointer. */
#define GETUTF8INC(c, eptr) \
{ \
if ((c & 0x20u) == 0) \
c = ((c & 0x1fu) << 6) | (*eptr++ & 0x3fu); \
else if ((c & 0x10u) == 0) \
{ \
c = ((c & 0x0fu) << 12) | ((*eptr & 0x3fu) << 6) | (eptr[1] & 0x3fu); \
eptr += 2; \
} \
else if ((c & 0x08u) == 0) \
{ \
c = ((c & 0x07u) << 18) | ((*eptr & 0x3fu) << 12) | \
((eptr[1] & 0x3fu) << 6) | (eptr[2] & 0x3fu); \
eptr += 3; \
} \
else if ((c & 0x04u) == 0) \
{ \
c = ((c & 0x03u) << 24) | ((*eptr & 0x3fu) << 18) | \
((eptr[1] & 0x3fu) << 12) | ((eptr[2] & 0x3fu) << 6) | \
(eptr[3] & 0x3fu); \
eptr += 4; \
} \
else \
{ \
c = ((c & 0x01u) << 30) | ((*eptr & 0x3fu) << 24) | \
((eptr[1] & 0x3fu) << 18) | ((eptr[2] & 0x3fu) << 12) | \
((eptr[3] & 0x3fu) << 6) | (eptr[4] & 0x3fu); \
eptr += 5; \
} \
}
/* Base macro to pick up the remaining bytes of a UTF-8 character, not
advancing the pointer, incrementing the length. */
#define GETUTF8LEN(c, eptr, len) \
{ \
if ((c & 0x20u) == 0) \
{ \
c = ((c & 0x1fu) << 6) | (eptr[1] & 0x3fu); \
len++; \
} \
else if ((c & 0x10u) == 0) \
{ \
c = ((c & 0x0fu) << 12) | ((eptr[1] & 0x3fu) << 6) | (eptr[2] & 0x3fu); \
len += 2; \
} \
else if ((c & 0x08u) == 0) \
{\
c = ((c & 0x07u) << 18) | ((eptr[1] & 0x3fu) << 12) | \
((eptr[2] & 0x3fu) << 6) | (eptr[3] & 0x3fu); \
len += 3; \
} \
else if ((c & 0x04u) == 0) \
{ \
c = ((c & 0x03u) << 24) | ((eptr[1] & 0x3fu) << 18) | \
((eptr[2] & 0x3fu) << 12) | ((eptr[3] & 0x3fu) << 6) | \
(eptr[4] & 0x3fu); \
len += 4; \
} \
else \
{\
c = ((c & 0x01u) << 30) | ((eptr[1] & 0x3fu) << 24) | \
((eptr[2] & 0x3fu) << 18) | ((eptr[3] & 0x3fu) << 12) | \
((eptr[4] & 0x3fu) << 6) | (eptr[5] & 0x3fu); \
len += 5; \
} \
}
/* --------------- Whitespace macros ---------------- */
/* Tests for Unicode horizontal and vertical whitespace characters must check a
number of different values. Using a switch statement for this generates the
fastest code (no loop, no memory access), and there are several places in the
interpreter code where this happens. In order to ensure that all the case lists
remain in step, we use macros so that there is only one place where the lists
are defined.
These values are also required as lists in pcre2_compile.c when processing \h,
\H, \v and \V in a character class. The lists are defined in pcre2_tables.c,
but macros that define the values are here so that all the definitions are
together. The lists must be in ascending character order, terminated by
NOTACHAR (which is 0xffffffff).
Any changes should ensure that the various macros are kept in step with each
other. NOTE: The values also appear in pcre2_jit_compile.c. */
/* -------------- ASCII/Unicode environments -------------- */
#ifndef EBCDIC
/* Character U+180E (Mongolian Vowel Separator) is not included in the list of
spaces in the Unicode file PropList.txt, and Perl does not recognize it as a
space. However, in many other sources it is listed as a space and has been in
PCRE (both APIs) for a long time. */
#define HSPACE_LIST \
CHAR_HT, CHAR_SPACE, CHAR_NBSP, \
0x1680, 0x180e, 0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005, \
0x2006, 0x2007, 0x2008, 0x2009, 0x200A, 0x202f, 0x205f, 0x3000, \
NOTACHAR
#define HSPACE_MULTIBYTE_CASES \
case 0x1680: /* OGHAM SPACE MARK */ \
case 0x180e: /* MONGOLIAN VOWEL SEPARATOR */ \
case 0x2000: /* EN QUAD */ \
case 0x2001: /* EM QUAD */ \
case 0x2002: /* EN SPACE */ \
case 0x2003: /* EM SPACE */ \
case 0x2004: /* THREE-PER-EM SPACE */ \
case 0x2005: /* FOUR-PER-EM SPACE */ \
case 0x2006: /* SIX-PER-EM SPACE */ \
case 0x2007: /* FIGURE SPACE */ \
case 0x2008: /* PUNCTUATION SPACE */ \
case 0x2009: /* THIN SPACE */ \
case 0x200A: /* HAIR SPACE */ \
case 0x202f: /* NARROW NO-BREAK SPACE */ \
case 0x205f: /* MEDIUM MATHEMATICAL SPACE */ \
case 0x3000 /* IDEOGRAPHIC SPACE */
#define HSPACE_BYTE_CASES \
case CHAR_HT: \
case CHAR_SPACE: \
case CHAR_NBSP
#define HSPACE_CASES \
HSPACE_BYTE_CASES: \
HSPACE_MULTIBYTE_CASES
#define VSPACE_LIST \
CHAR_LF, CHAR_VT, CHAR_FF, CHAR_CR, CHAR_NEL, 0x2028, 0x2029, NOTACHAR
#define VSPACE_MULTIBYTE_CASES \
case 0x2028: /* LINE SEPARATOR */ \
case 0x2029 /* PARAGRAPH SEPARATOR */
#define VSPACE_BYTE_CASES \
case CHAR_LF: \
case CHAR_VT: \
case CHAR_FF: \
case CHAR_CR: \
case CHAR_NEL
#define VSPACE_CASES \
VSPACE_BYTE_CASES: \
VSPACE_MULTIBYTE_CASES
/* -------------- EBCDIC environments -------------- */
#else
#define HSPACE_LIST CHAR_HT, CHAR_SPACE, CHAR_NBSP, NOTACHAR
#define HSPACE_BYTE_CASES \
case CHAR_HT: \
case CHAR_SPACE: \
case CHAR_NBSP
#define HSPACE_CASES HSPACE_BYTE_CASES
#ifdef EBCDIC_NL25
#define VSPACE_LIST \
CHAR_VT, CHAR_FF, CHAR_CR, CHAR_NEL, CHAR_LF, NOTACHAR
#else
#define VSPACE_LIST \
CHAR_VT, CHAR_FF, CHAR_CR, CHAR_LF, CHAR_NEL, NOTACHAR
#endif
#define VSPACE_BYTE_CASES \
case CHAR_LF: \
case CHAR_VT: \
case CHAR_FF: \
case CHAR_CR: \
case CHAR_NEL
#define VSPACE_CASES VSPACE_BYTE_CASES
#endif /* EBCDIC */
/* -------------- End of whitespace macros -------------- */
/* PCRE2 is able to support several different kinds of newline (CR, LF, CRLF,
"any" and "anycrlf" at present). The following macros are used to package up
testing for newlines. NLBLOCK, PSSTART, and PSEND are defined in the various
modules to indicate in which datablock the parameters exist, and what the
start/end of string field names are. */
#define NLTYPE_FIXED 0 /* Newline is a fixed length string */
#define NLTYPE_ANY 1 /* Newline is any Unicode line ending */
#define NLTYPE_ANYCRLF 2 /* Newline is CR, LF, or CRLF */
/* This macro checks for a newline at the given position */
#define IS_NEWLINE(p) \
((NLBLOCK->nltype != NLTYPE_FIXED)? \
((p) < NLBLOCK->PSEND && \
PRIV(is_newline)((p), NLBLOCK->nltype, NLBLOCK->PSEND, \
&(NLBLOCK->nllen), utf)) \
: \
((p) <= NLBLOCK->PSEND - NLBLOCK->nllen && \
UCHAR21TEST(p) == NLBLOCK->nl[0] && \
(NLBLOCK->nllen == 1 || UCHAR21TEST(p+1) == NLBLOCK->nl[1]) \
) \
)
/* This macro checks for a newline immediately preceding the given position */
#define WAS_NEWLINE(p) \
((NLBLOCK->nltype != NLTYPE_FIXED)? \
((p) > NLBLOCK->PSSTART && \
PRIV(was_newline)((p), NLBLOCK->nltype, NLBLOCK->PSSTART, \
&(NLBLOCK->nllen), utf)) \
: \
((p) >= NLBLOCK->PSSTART + NLBLOCK->nllen && \
UCHAR21TEST(p - NLBLOCK->nllen) == NLBLOCK->nl[0] && \
(NLBLOCK->nllen == 1 || UCHAR21TEST(p - NLBLOCK->nllen + 1) == NLBLOCK->nl[1]) \
) \
)
/* Private flags containing information about the compiled pattern. The first
three must not be changed, because whichever is set is actually the number of
bytes in a code unit in that mode. */
#define PCRE2_MODE8 0x00000001 /* compiled in 8 bit mode */
#define PCRE2_MODE16 0x00000002 /* compiled in 16 bit mode */
#define PCRE2_MODE32 0x00000004 /* compiled in 32 bit mode */
#define PCRE2_FIRSTSET 0x00000010 /* first_code unit is set */
#define PCRE2_FIRSTCASELESS 0x00000020 /* caseless first code unit */
#define PCRE2_FIRSTMAPSET 0x00000040 /* bitmap of first code units is set */
#define PCRE2_LASTSET 0x00000080 /* last code unit is set */
#define PCRE2_LASTCASELESS 0x00000100 /* caseless last code unit */
#define PCRE2_STARTLINE 0x00000200 /* start after \n for multiline */
#define PCRE2_JCHANGED 0x00000400 /* j option used in pattern */
#define PCRE2_HASCRORLF 0x00000800 /* explicit \r or \n in pattern */
#define PCRE2_HASTHEN 0x00001000 /* pattern contains (*THEN) */
#define PCRE2_MATCH_EMPTY 0x00002000 /* pattern can match empty string */
#define PCRE2_BSR_SET 0x00004000 /* BSR was set in the pattern */
#define PCRE2_NL_SET 0x00008000 /* newline was set in the pattern */
#define PCRE2_NOTEMPTY_SET 0x00010000 /* (*NOTEMPTY) used ) keep */
#define PCRE2_NE_ATST_SET 0x00020000 /* (*NOTEMPTY_ATSTART) used) together */
#define PCRE2_DEREF_TABLES 0x00040000 /* release character tables */
#define PCRE2_NOJIT 0x00080000 /* (*NOJIT) used */
#define PCRE2_HASBKPORX 0x00100000 /* contains \P, \p, or \X */
#define PCRE2_DUPCAPUSED 0x00200000 /* contains (?| */
#define PCRE2_HASBKC 0x00400000 /* contains \C */
#define PCRE2_MODE_MASK (PCRE2_MODE8 | PCRE2_MODE16 | PCRE2_MODE32)
/* Values for the matchedby field in a match data block. */
enum { PCRE2_MATCHEDBY_INTERPRETER, /* pcre2_match() */
PCRE2_MATCHEDBY_DFA_INTERPRETER, /* pcre2_dfa_match() */
PCRE2_MATCHEDBY_JIT }; /* pcre2_jit_match() */
/* Values for the flags field in a match data block. */
#define PCRE2_MD_COPIED_SUBJECT 0x01u
/* Magic number to provide a small check against being handed junk. */
#define MAGIC_NUMBER 0x50435245UL /* 'PCRE' */
/* The maximum remaining length of subject we are prepared to search for a
req_unit match. In 8-bit mode, memchr() is used and is much faster than the
search loop that has to be used in 16-bit and 32-bit modes. */
#if PCRE2_CODE_UNIT_WIDTH == 8
#define REQ_CU_MAX 2000
#else
#define REQ_CU_MAX 1000
#endif
/* Offsets for the bitmap tables in the cbits set of tables. Each table
contains a set of bits for a class map. Some classes are built by combining
these tables. */
#define cbit_space 0 /* [:space:] or \s */
#define cbit_xdigit 32 /* [:xdigit:] */
#define cbit_digit 64 /* [:digit:] or \d */
#define cbit_upper 96 /* [:upper:] */
#define cbit_lower 128 /* [:lower:] */
#define cbit_word 160 /* [:word:] or \w */
#define cbit_graph 192 /* [:graph:] */
#define cbit_print 224 /* [:print:] */
#define cbit_punct 256 /* [:punct:] */
#define cbit_cntrl 288 /* [:cntrl:] */
#define cbit_length 320 /* Length of the cbits table */
/* Bit definitions for entries in the ctypes table. Do not change these values
without checking pcre2_jit_compile.c, which has an assertion to ensure that
ctype_word has the value 16. */
#define ctype_space 0x01
#define ctype_letter 0x02
#define ctype_lcletter 0x04
#define ctype_digit 0x08
#define ctype_word 0x10 /* alphanumeric or '_' */
/* Offsets of the various tables from the base tables pointer, and
total length of the tables. */
#define lcc_offset 0 /* Lower case */
#define fcc_offset 256 /* Flip case */
#define cbits_offset 512 /* Character classes */
#define ctypes_offset (cbits_offset + cbit_length) /* Character types */
#define tables_length (ctypes_offset + 256)
/* -------------------- Character and string names ------------------------ */
/* If PCRE2 is to support UTF-8 on EBCDIC platforms, we cannot use normal
character constants like '*' because the compiler would emit their EBCDIC code,
which is different from their ASCII/UTF-8 code. Instead we define macros for
the characters so that they always use the ASCII/UTF-8 code when UTF-8 support
is enabled. When UTF-8 support is not enabled, the definitions use character
literals. Both character and string versions of each character are needed, and
there are some longer strings as well.
This means that, on EBCDIC platforms, the PCRE2 library can handle either
EBCDIC, or UTF-8, but not both. To support both in the same compiled library
would need different lookups depending on whether PCRE2_UTF was set or not.
This would make it impossible to use characters in switch/case statements,
which would reduce performance. For a theoretical use (which nobody has asked
for) in a minority area (EBCDIC platforms), this is not sensible. Any
application that did need both could compile two versions of the library, using
macros to give the functions distinct names. */
#ifndef SUPPORT_UNICODE
/* UTF-8 support is not enabled; use the platform-dependent character literals
so that PCRE2 works in both ASCII and EBCDIC environments, but only in non-UTF
mode. Newline characters are problematic in EBCDIC. Though it has CR and LF
characters, a common practice has been to use its NL (0x15) character as the
line terminator in C-like processing environments. However, sometimes the LF
(0x25) character is used instead, according to this Unicode document:
http://unicode.org/standard/reports/tr13/tr13-5.html
PCRE2 defaults EBCDIC NL to 0x15, but has a build-time option to select 0x25
instead. Whichever is *not* chosen is defined as NEL.
In both ASCII and EBCDIC environments, CHAR_NL and CHAR_LF are synonyms for the
same code point. */
#ifdef EBCDIC
#ifndef EBCDIC_NL25
#define CHAR_NL '\x15'
#define CHAR_NEL '\x25'
#define STR_NL "\x15"
#define STR_NEL "\x25"
#else
#define CHAR_NL '\x25'
#define CHAR_NEL '\x15'
#define STR_NL "\x25"
#define STR_NEL "\x15"
#endif
#define CHAR_LF CHAR_NL
#define STR_LF STR_NL
#define CHAR_ESC '\047'
#define CHAR_DEL '\007'
#define CHAR_NBSP ((unsigned char)'\x41')
#define STR_ESC "\047"
#define STR_DEL "\007"
#else /* Not EBCDIC */
/* In ASCII/Unicode, linefeed is '\n' and we equate this to NL for
compatibility. NEL is the Unicode newline character; make sure it is
a positive value. */
#define CHAR_LF '\n'
#define CHAR_NL CHAR_LF
#define CHAR_NEL ((unsigned char)'\x85')
#define CHAR_ESC '\033'
#define CHAR_DEL '\177'
#define CHAR_NBSP ((unsigned char)'\xa0')
#define STR_LF "\n"
#define STR_NL STR_LF
#define STR_NEL "\x85"
#define STR_ESC "\033"
#define STR_DEL "\177"
#endif /* EBCDIC */
/* The remaining definitions work in both environments. */
#define CHAR_NUL '\0'
#define CHAR_HT '\t'
#define CHAR_VT '\v'
#define CHAR_FF '\f'
#define CHAR_CR '\r'
#define CHAR_BS '\b'
#define CHAR_BEL '\a'
#define CHAR_SPACE ' '
#define CHAR_EXCLAMATION_MARK '!'
#define CHAR_QUOTATION_MARK '"'
#define CHAR_NUMBER_SIGN '#'
#define CHAR_DOLLAR_SIGN '$'
#define CHAR_PERCENT_SIGN '%'
#define CHAR_AMPERSAND '&'
#define CHAR_APOSTROPHE '\''
#define CHAR_LEFT_PARENTHESIS '('
#define CHAR_RIGHT_PARENTHESIS ')'
#define CHAR_ASTERISK '*'
#define CHAR_PLUS '+'
#define CHAR_COMMA ','
#define CHAR_MINUS '-'
#define CHAR_DOT '.'
#define CHAR_SLASH '/'
#define CHAR_0 '0'
#define CHAR_1 '1'
#define CHAR_2 '2'
#define CHAR_3 '3'
#define CHAR_4 '4'
#define CHAR_5 '5'
#define CHAR_6 '6'
#define CHAR_7 '7'
#define CHAR_8 '8'
#define CHAR_9 '9'
#define CHAR_COLON ':'
#define CHAR_SEMICOLON ';'
#define CHAR_LESS_THAN_SIGN '<'
#define CHAR_EQUALS_SIGN '='
#define CHAR_GREATER_THAN_SIGN '>'
#define CHAR_QUESTION_MARK '?'
#define CHAR_COMMERCIAL_AT '@'
#define CHAR_A 'A'
#define CHAR_B 'B'
#define CHAR_C 'C'
#define CHAR_D 'D'
#define CHAR_E 'E'
#define CHAR_F 'F'
#define CHAR_G 'G'
#define CHAR_H 'H'
#define CHAR_I 'I'
#define CHAR_J 'J'
#define CHAR_K 'K'
#define CHAR_L 'L'
#define CHAR_M 'M'
#define CHAR_N 'N'
#define CHAR_O 'O'
#define CHAR_P 'P'
#define CHAR_Q 'Q'
#define CHAR_R 'R'
#define CHAR_S 'S'
#define CHAR_T 'T'
#define CHAR_U 'U'
#define CHAR_V 'V'
#define CHAR_W 'W'
#define CHAR_X 'X'
#define CHAR_Y 'Y'
#define CHAR_Z 'Z'
#define CHAR_LEFT_SQUARE_BRACKET '['
#define CHAR_BACKSLASH '\\'
#define CHAR_RIGHT_SQUARE_BRACKET ']'
#define CHAR_CIRCUMFLEX_ACCENT '^'
#define CHAR_UNDERSCORE '_'
#define CHAR_GRAVE_ACCENT '`'
#define CHAR_a 'a'
#define CHAR_b 'b'
#define CHAR_c 'c'
#define CHAR_d 'd'
#define CHAR_e 'e'
#define CHAR_f 'f'
#define CHAR_g 'g'
#define CHAR_h 'h'
#define CHAR_i 'i'
#define CHAR_j 'j'
#define CHAR_k 'k'
#define CHAR_l 'l'
#define CHAR_m 'm'
#define CHAR_n 'n'
#define CHAR_o 'o'
#define CHAR_p 'p'
#define CHAR_q 'q'
#define CHAR_r 'r'
#define CHAR_s 's'
#define CHAR_t 't'
#define CHAR_u 'u'
#define CHAR_v 'v'
#define CHAR_w 'w'
#define CHAR_x 'x'
#define CHAR_y 'y'
#define CHAR_z 'z'
#define CHAR_LEFT_CURLY_BRACKET '{'
#define CHAR_VERTICAL_LINE '|'
#define CHAR_RIGHT_CURLY_BRACKET '}'
#define CHAR_TILDE '~'
#define STR_HT "\t"
#define STR_VT "\v"
#define STR_FF "\f"
#define STR_CR "\r"
#define STR_BS "\b"
#define STR_BEL "\a"
#define STR_SPACE " "
#define STR_EXCLAMATION_MARK "!"
#define STR_QUOTATION_MARK "\""
#define STR_NUMBER_SIGN "#"
#define STR_DOLLAR_SIGN "$"
#define STR_PERCENT_SIGN "%"
#define STR_AMPERSAND "&"
#define STR_APOSTROPHE "'"
#define STR_LEFT_PARENTHESIS "("
#define STR_RIGHT_PARENTHESIS ")"
#define STR_ASTERISK "*"
#define STR_PLUS "+"
#define STR_COMMA ","
#define STR_MINUS "-"
#define STR_DOT "."
#define STR_SLASH "/"
#define STR_0 "0"
#define STR_1 "1"
#define STR_2 "2"
#define STR_3 "3"
#define STR_4 "4"
#define STR_5 "5"
#define STR_6 "6"
#define STR_7 "7"
#define STR_8 "8"
#define STR_9 "9"
#define STR_COLON ":"
#define STR_SEMICOLON ";"
#define STR_LESS_THAN_SIGN "<"
#define STR_EQUALS_SIGN "="
#define STR_GREATER_THAN_SIGN ">"
#define STR_QUESTION_MARK "?"
#define STR_COMMERCIAL_AT "@"
#define STR_A "A"
#define STR_B "B"
#define STR_C "C"
#define STR_D "D"
#define STR_E "E"
#define STR_F "F"
#define STR_G "G"
#define STR_H "H"
#define STR_I "I"
#define STR_J "J"
#define STR_K "K"
#define STR_L "L"
#define STR_M "M"
#define STR_N "N"
#define STR_O "O"
#define STR_P "P"
#define STR_Q "Q"
#define STR_R "R"
#define STR_S "S"
#define STR_T "T"
#define STR_U "U"
#define STR_V "V"
#define STR_W "W"
#define STR_X "X"
#define STR_Y "Y"
#define STR_Z "Z"
#define STR_LEFT_SQUARE_BRACKET "["
#define STR_BACKSLASH "\\"
#define STR_RIGHT_SQUARE_BRACKET "]"
#define STR_CIRCUMFLEX_ACCENT "^"
#define STR_UNDERSCORE "_"
#define STR_GRAVE_ACCENT "`"
#define STR_a "a"
#define STR_b "b"
#define STR_c "c"
#define STR_d "d"
#define STR_e "e"
#define STR_f "f"
#define STR_g "g"
#define STR_h "h"
#define STR_i "i"
#define STR_j "j"
#define STR_k "k"
#define STR_l "l"
#define STR_m "m"
#define STR_n "n"
#define STR_o "o"
#define STR_p "p"
#define STR_q "q"
#define STR_r "r"
#define STR_s "s"
#define STR_t "t"
#define STR_u "u"
#define STR_v "v"
#define STR_w "w"
#define STR_x "x"
#define STR_y "y"
#define STR_z "z"
#define STR_LEFT_CURLY_BRACKET "{"
#define STR_VERTICAL_LINE "|"
#define STR_RIGHT_CURLY_BRACKET "}"
#define STR_TILDE "~"
#define STRING_ACCEPT0 "ACCEPT\0"
#define STRING_COMMIT0 "COMMIT\0"
#define STRING_F0 "F\0"
#define STRING_FAIL0 "FAIL\0"
#define STRING_MARK0 "MARK\0"
#define STRING_PRUNE0 "PRUNE\0"
#define STRING_SKIP0 "SKIP\0"
#define STRING_THEN "THEN"
#define STRING_atomic0 "atomic\0"
#define STRING_pla0 "pla\0"
#define STRING_plb0 "plb\0"
#define STRING_nla0 "nla\0"
#define STRING_nlb0 "nlb\0"
#define STRING_sr0 "sr\0"
#define STRING_asr0 "asr\0"
#define STRING_positive_lookahead0 "positive_lookahead\0"
#define STRING_positive_lookbehind0 "positive_lookbehind\0"
#define STRING_negative_lookahead0 "negative_lookahead\0"
#define STRING_negative_lookbehind0 "negative_lookbehind\0"
#define STRING_script_run0 "script_run\0"
#define STRING_atomic_script_run "atomic_script_run"
#define STRING_alpha0 "alpha\0"
#define STRING_lower0 "lower\0"
#define STRING_upper0 "upper\0"
#define STRING_alnum0 "alnum\0"
#define STRING_ascii0 "ascii\0"
#define STRING_blank0 "blank\0"
#define STRING_cntrl0 "cntrl\0"
#define STRING_digit0 "digit\0"
#define STRING_graph0 "graph\0"
#define STRING_print0 "print\0"
#define STRING_punct0 "punct\0"
#define STRING_space0 "space\0"
#define STRING_word0 "word\0"
#define STRING_xdigit "xdigit"
#define STRING_DEFINE "DEFINE"
#define STRING_VERSION "VERSION"
#define STRING_WEIRD_STARTWORD "[:<:]]"
#define STRING_WEIRD_ENDWORD "[:>:]]"
#define STRING_CR_RIGHTPAR "CR)"
#define STRING_LF_RIGHTPAR "LF)"
#define STRING_CRLF_RIGHTPAR "CRLF)"
#define STRING_ANY_RIGHTPAR "ANY)"
#define STRING_ANYCRLF_RIGHTPAR "ANYCRLF)"
#define STRING_NUL_RIGHTPAR "NUL)"
#define STRING_BSR_ANYCRLF_RIGHTPAR "BSR_ANYCRLF)"
#define STRING_BSR_UNICODE_RIGHTPAR "BSR_UNICODE)"
#define STRING_UTF8_RIGHTPAR "UTF8)"
#define STRING_UTF16_RIGHTPAR "UTF16)"
#define STRING_UTF32_RIGHTPAR "UTF32)"
#define STRING_UTF_RIGHTPAR "UTF)"
#define STRING_UCP_RIGHTPAR "UCP)"
#define STRING_NO_AUTO_POSSESS_RIGHTPAR "NO_AUTO_POSSESS)"
#define STRING_NO_DOTSTAR_ANCHOR_RIGHTPAR "NO_DOTSTAR_ANCHOR)"
#define STRING_NO_JIT_RIGHTPAR "NO_JIT)"
#define STRING_NO_START_OPT_RIGHTPAR "NO_START_OPT)"
#define STRING_NOTEMPTY_RIGHTPAR "NOTEMPTY)"
#define STRING_NOTEMPTY_ATSTART_RIGHTPAR "NOTEMPTY_ATSTART)"
#define STRING_LIMIT_HEAP_EQ "LIMIT_HEAP="
#define STRING_LIMIT_MATCH_EQ "LIMIT_MATCH="
#define STRING_LIMIT_DEPTH_EQ "LIMIT_DEPTH="
#define STRING_LIMIT_RECURSION_EQ "LIMIT_RECURSION="
#define STRING_MARK "MARK"
#else /* SUPPORT_UNICODE */
/* UTF-8 support is enabled; always use UTF-8 (=ASCII) character codes. This
works in both modes non-EBCDIC platforms, and on EBCDIC platforms in UTF-8 mode
only. */
#define CHAR_HT '\011'
#define CHAR_VT '\013'
#define CHAR_FF '\014'
#define CHAR_CR '\015'
#define CHAR_LF '\012'
#define CHAR_NL CHAR_LF
#define CHAR_NEL ((unsigned char)'\x85')
#define CHAR_BS '\010'
#define CHAR_BEL '\007'
#define CHAR_ESC '\033'
#define CHAR_DEL '\177'
#define CHAR_NUL '\0'
#define CHAR_SPACE '\040'
#define CHAR_EXCLAMATION_MARK '\041'
#define CHAR_QUOTATION_MARK '\042'
#define CHAR_NUMBER_SIGN '\043'
#define CHAR_DOLLAR_SIGN '\044'
#define CHAR_PERCENT_SIGN '\045'
#define CHAR_AMPERSAND '\046'
#define CHAR_APOSTROPHE '\047'
#define CHAR_LEFT_PARENTHESIS '\050'
#define CHAR_RIGHT_PARENTHESIS '\051'
#define CHAR_ASTERISK '\052'
#define CHAR_PLUS '\053'
#define CHAR_COMMA '\054'
#define CHAR_MINUS '\055'
#define CHAR_DOT '\056'
#define CHAR_SLASH '\057'
#define CHAR_0 '\060'
#define CHAR_1 '\061'
#define CHAR_2 '\062'
#define CHAR_3 '\063'
#define CHAR_4 '\064'
#define CHAR_5 '\065'
#define CHAR_6 '\066'
#define CHAR_7 '\067'
#define CHAR_8 '\070'
#define CHAR_9 '\071'
#define CHAR_COLON '\072'
#define CHAR_SEMICOLON '\073'
#define CHAR_LESS_THAN_SIGN '\074'
#define CHAR_EQUALS_SIGN '\075'
#define CHAR_GREATER_THAN_SIGN '\076'
#define CHAR_QUESTION_MARK '\077'
#define CHAR_COMMERCIAL_AT '\100'
#define CHAR_A '\101'
#define CHAR_B '\102'
#define CHAR_C '\103'
#define CHAR_D '\104'
#define CHAR_E '\105'
#define CHAR_F '\106'
#define CHAR_G '\107'
#define CHAR_H '\110'
#define CHAR_I '\111'