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regex.c
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regex.c
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/* Extended regular expression matching and search library.
Copyright (C) 1993, 94, 95, 96, 97, 98 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* Multi-byte extension added May, 1993 by t^2 (Takahiro Tanimoto)
Last change: May 21, 1993 by t^2 */
/* removed gapped buffer support, multiple syntax support by matz <matz@nts.co.jp> */
/* Perl5 extension added by matz <matz@caelum.co.jp> */
/* UTF-8 extension added Jan 16 1999 by Yoshida Masato <yoshidam@tau.bekkoame.ne.jp> */
#include "config.h"
#ifdef HAVE_STRING_H
# include <string.h>
#else
# include <strings.h>
#endif
/* We write fatal error messages on standard error. */
#include <stdio.h>
/* isalpha(3) etc. are used for the character classes. */
#include <ctype.h>
#include <sys/types.h>
#ifndef PARAMS
# if defined __GNUC__ || (defined __STDC__ && __STDC__)
# define PARAMS(args) args
# else
# define PARAMS(args) ()
# endif /* GCC. */
#endif /* Not PARAMS. */
#if defined(STDC_HEADERS)
# include <stddef.h>
#else
/* We need this for `regex.h', and perhaps for the Emacs include files. */
# include <sys/types.h>
#endif
#ifndef __STDC__
# define volatile
#endif
#ifdef HAVE_PROTOTYPES
# define _(args) args
#else
# define _(args) ()
#endif
#ifdef RUBY_PLATFORM
#include "defines.h"
# define RUBY
extern int rb_prohibit_interrupt;
extern int rb_trap_pending;
void rb_trap_exec _((void));
# define CHECK_INTS if (!rb_prohibit_interrupt) {\
if (rb_trap_pending) rb_trap_exec();\
}
#define xmalloc ruby_xmalloc
#define xcalloc ruby_xcalloc
#define xrealloc ruby_xrealloc
#define xfree ruby_xfree
void *xmalloc _((size_t));
void *xcalloc _((size_t,size_t));
void *xrealloc _((void*,size_t));
void xfree _((void*));
#endif
/* Make alloca work the best possible way. */
#ifdef __GNUC__
# ifndef atarist
# ifndef alloca
# define alloca __builtin_alloca
# endif
# endif /* atarist */
#else
# if defined(HAVE_ALLOCA_H)
# include <alloca.h>
# elif !defined(alloca)
char *alloca();
# endif
#endif /* __GNUC__ */
#ifdef _AIX
#pragma alloca
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#else
# include <strings.h>
#endif
#ifdef C_ALLOCA
#define FREE_VARIABLES() alloca(0)
#else
#define FREE_VARIABLES()
#endif
#define FREE_AND_RETURN_VOID(stackb) do { \
FREE_VARIABLES(); \
if (stackb != stacka) xfree(stackb); \
return; \
} while(0)
#define FREE_AND_RETURN(stackb,val) do { \
FREE_VARIABLES(); \
if (stackb != stacka) xfree(stackb); \
return(val); \
} while(0)
#define DOUBLE_STACK(type) do { \
type *stackx; \
unsigned int xlen = stacke - stackb; \
if (stackb == stacka) { \
stackx = (type*)xmalloc(2 * xlen * sizeof(type)); \
memcpy(stackx, stackb, xlen * sizeof (type)); \
} \
else { \
stackx = (type*)xrealloc(stackb, 2 * xlen * sizeof(type)); \
} \
/* Rearrange the pointers. */ \
stackp = stackx + (stackp - stackb); \
stackb = stackx; \
stacke = stackb + 2 * xlen; \
} while (0)
#define RE_TALLOC(n,t) ((t*)alloca((n)*sizeof(t)))
#define TMALLOC(n,t) ((t*)xmalloc((n)*sizeof(t)))
#define TREALLOC(s,n,t) (s=((t*)xrealloc(s,(n)*sizeof(t))))
#define EXPAND_FAIL_STACK() DOUBLE_STACK(unsigned char*)
#define ENSURE_FAIL_STACK(n) \
do { \
if (stacke - stackp <= (n)) { \
/* if (len > re_max_failures * MAX_NUM_FAILURE_ITEMS) \
{ \
FREE_AND_RETURN(stackb,(-2)); \
}*/ \
\
/* Roughly double the size of the stack. */ \
EXPAND_FAIL_STACK(); \
} \
} while (0)
/* Get the interface, including the syntax bits. */
#include "regex.h"
/* Subroutines for re_compile_pattern. */
static void store_jump _((char*, int, char*));
static void insert_jump _((int, char*, char*, char*));
static void store_jump_n _((char*, int, char*, unsigned));
static void insert_jump_n _((int, char*, char*, char*, unsigned));
static void insert_op _((int, char*, char*));
static void insert_op_2 _((int, char*, char*, int, int));
static int memcmp_translate _((unsigned char*, unsigned char*, int));
/* Define the syntax stuff, so we can do the \<, \>, etc. */
/* This must be nonzero for the wordchar and notwordchar pattern
commands in re_match. */
#define Sword 1
#define Sword2 2
#define SYNTAX(c) re_syntax_table[c]
static char re_syntax_table[256];
static void init_syntax_once _((void));
static const unsigned char *translate = 0;
static void init_regs _((struct re_registers*, unsigned int));
static void bm_init_skip _((int *, unsigned char*, int, const unsigned char*));
static int current_mbctype = MBCTYPE_ASCII;
#undef P
#ifdef RUBY
#include "util.h"
#endif
static void
init_syntax_once()
{
register int c;
static int done = 0;
if (done)
return;
memset(re_syntax_table, 0, sizeof re_syntax_table);
for (c=0; c<=0x7f; c++)
if (isalnum(c))
re_syntax_table[c] = Sword;
re_syntax_table['_'] = Sword;
for (c=0x80; c<=0xff; c++)
if (isalnum(c))
re_syntax_table[c] = Sword2;
done = 1;
}
void
re_set_casetable(table)
const char *table;
{
translate = (const unsigned char*)table;
}
/* Jim Meyering writes:
"... Some ctype macros are valid only for character codes that
isascii says are ASCII (SGI's IRIX-4.0.5 is one such system --when
using /bin/cc or gcc but without giving an ansi option). So, all
ctype uses should be through macros like ISPRINT... If
STDC_HEADERS is defined, then autoconf has verified that the ctype
macros don't need to be guarded with references to isascii. ...
Defining isascii to 1 should let any compiler worth its salt
eliminate the && through constant folding."
Solaris defines some of these symbols so we must undefine them first. */
#undef ISASCII
#if defined STDC_HEADERS || (!defined isascii && !defined HAVE_ISASCII)
# define ISASCII(c) 1
#else
# define ISASCII(c) isascii(c)
#endif
#ifdef isblank
# define ISBLANK(c) (ISASCII(c) && isblank(c))
#else
# define ISBLANK(c) ((c) == ' ' || (c) == '\t')
#endif
#ifdef isgraph
# define ISGRAPH(c) (ISASCII(c) && isgraph(c))
#else
# define ISGRAPH(c) (ISASCII(c) && isprint(c) && !isspace(c))
#endif
#undef ISPRINT
#define ISPRINT(c) (ISASCII(c) && isprint(c))
#define ISDIGIT(c) (ISASCII(c) && isdigit(c))
#define ISALNUM(c) (ISASCII(c) && isalnum(c))
#define ISALPHA(c) (ISASCII(c) && isalpha(c))
#define ISCNTRL(c) (ISASCII(c) && iscntrl(c))
#define ISLOWER(c) (ISASCII(c) && islower(c))
#define ISPUNCT(c) (ISASCII(c) && ispunct(c))
#define ISSPACE(c) (ISASCII(c) && isspace(c))
#define ISUPPER(c) (ISASCII(c) && isupper(c))
#define ISXDIGIT(c) (ISASCII(c) && isxdigit(c))
#ifndef NULL
# define NULL (void *)0
#endif
/* We remove any previous definition of `SIGN_EXTEND_CHAR',
since ours (we hope) works properly with all combinations of
machines, compilers, `char' and `unsigned char' argument types.
(Per Bothner suggested the basic approach.) */
#undef SIGN_EXTEND_CHAR
#if __STDC__
# define SIGN_EXTEND_CHAR(c) ((signed char)(c))
#else /* not __STDC__ */
/* As in Harbison and Steele. */
# define SIGN_EXTEND_CHAR(c) ((((unsigned char)(c)) ^ 128) - 128)
#endif
/* These are the command codes that appear in compiled regular
expressions, one per byte. Some command codes are followed by
argument bytes. A command code can specify any interpretation
whatsoever for its arguments. Zero-bytes may appear in the compiled
regular expression.
The value of `exactn' is needed in search.c (search_buffer) in emacs.
So regex.h defines a symbol `RE_EXACTN_VALUE' to be 1; the value of
`exactn' we use here must also be 1. */
enum regexpcode
{
unused=0,
exactn=1, /* Followed by one byte giving n, then by n literal bytes. */
begline, /* Fail unless at beginning of line. */
endline, /* Fail unless at end of line. */
begbuf, /* Succeeds if at beginning of buffer (if emacs) or at beginning
of string to be matched (if not). */
endbuf, /* Analogously, for end of buffer/string. */
endbuf2, /* End of buffer/string, or newline just before it. */
begpos, /* Matches where last scan//gsub left off. */
jump, /* Followed by two bytes giving relative address to jump to. */
jump_past_alt,/* Same as jump, but marks the end of an alternative. */
on_failure_jump, /* Followed by two bytes giving relative address of
place to resume at in case of failure. */
finalize_jump, /* Throw away latest failure point and then jump to
address. */
maybe_finalize_jump, /* Like jump but finalize if safe to do so.
This is used to jump back to the beginning
of a repeat. If the command that follows
this jump is clearly incompatible with the
one at the beginning of the repeat, such that
we can be sure that there is no use backtracking
out of repetitions already completed,
then we finalize. */
dummy_failure_jump, /* Jump, and push a dummy failure point. This
failure point will be thrown away if an attempt
is made to use it for a failure. A + construct
makes this before the first repeat. Also
use it as an intermediary kind of jump when
compiling an or construct. */
push_dummy_failure, /* Push a dummy failure point and continue. Used at the end of
alternatives. */
succeed_n, /* Used like on_failure_jump except has to succeed n times;
then gets turned into an on_failure_jump. The relative
address following it is useless until then. The
address is followed by two bytes containing n. */
jump_n, /* Similar to jump, but jump n times only; also the relative
address following is in turn followed by yet two more bytes
containing n. */
try_next, /* Jump to next pattern for the first time,
leaving this pattern on the failure stack. */
finalize_push, /* Finalize stack and push the beginning of the pattern
on the stack to retry (used for non-greedy match) */
finalize_push_n, /* Similar to finalize_push, buf finalize n time only */
set_number_at, /* Set the following relative location to the
subsequent number. */
anychar, /* Matches any (more or less) one character excluding newlines. */
anychar_repeat, /* Matches sequence of characters excluding newlines. */
charset, /* Matches any one char belonging to specified set.
First following byte is number of bitmap bytes.
Then come bytes for a bitmap saying which chars are in.
Bits in each byte are ordered low-bit-first.
A character is in the set if its bit is 1.
A character too large to have a bit in the map
is automatically not in the set. */
charset_not, /* Same parameters as charset, but match any character
that is not one of those specified. */
start_memory, /* Start remembering the text that is matched, for
storing in a memory register. Followed by one
byte containing the register number. Register numbers
must be in the range 0 through RE_NREGS. */
stop_memory, /* Stop remembering the text that is matched
and store it in a memory register. Followed by
one byte containing the register number. Register
numbers must be in the range 0 through RE_NREGS. */
start_paren, /* Place holder at the start of (?:..). */
stop_paren, /* Place holder at the end of (?:..). */
casefold_on, /* Turn on casefold flag. */
casefold_off, /* Turn off casefold flag. */
option_set, /* Turn on multi line match (match with newlines). */
start_nowidth, /* Save string point to the stack. */
stop_nowidth, /* Restore string place at the point start_nowidth. */
pop_and_fail, /* Fail after popping nowidth entry from stack. */
stop_backtrack, /* Restore backtrack stack at the point start_nowidth. */
duplicate, /* Match a duplicate of something remembered.
Followed by one byte containing the index of the memory
register. */
wordchar, /* Matches any word-constituent character. */
notwordchar, /* Matches any char that is not a word-constituent. */
wordbeg, /* Succeeds if at word beginning. */
wordend, /* Succeeds if at word end. */
wordbound, /* Succeeds if at a word boundary. */
notwordbound,/* Succeeds if not at a word boundary. */
};
/* Number of failure points to allocate space for initially,
when matching. If this number is exceeded, more space is allocated,
so it is not a hard limit. */
#ifndef NFAILURES
#define NFAILURES 160
#endif
/* Store NUMBER in two contiguous bytes starting at DESTINATION. */
#define STORE_NUMBER(destination, number) \
do { (destination)[0] = (number) & 0377; \
(destination)[1] = (number) >> 8; } while (0)
/* Same as STORE_NUMBER, except increment the destination pointer to
the byte after where the number is stored. Watch out that values for
DESTINATION such as p + 1 won't work, whereas p will. */
#define STORE_NUMBER_AND_INCR(destination, number) \
do { STORE_NUMBER(destination, number); \
(destination) += 2; } while (0)
/* Put into DESTINATION a number stored in two contingous bytes starting
at SOURCE. */
#define EXTRACT_NUMBER(destination, source) \
do { (destination) = *(source) & 0377; \
(destination) += SIGN_EXTEND_CHAR(*(char*)((source) + 1)) << 8; } while (0)
/* Same as EXTRACT_NUMBER, except increment the pointer for source to
point to second byte of SOURCE. Note that SOURCE has to be a value
such as p, not, e.g., p + 1. */
#define EXTRACT_NUMBER_AND_INCR(destination, source) \
do { EXTRACT_NUMBER(destination, source); \
(source) += 2; } while (0)
/* Specify the precise syntax of regexps for compilation. This provides
for compatibility for various utilities which historically have
different, incompatible syntaxes.
The argument SYNTAX is a bit-mask comprised of the various bits
defined in regex.h. */
long
re_set_syntax(syntax)
long syntax;
{
/* obsolete */
return 0;
}
/* Macros for re_compile_pattern, which is found below these definitions. */
#define TRANSLATE_P() ((options&RE_OPTION_IGNORECASE) && translate)
#define MAY_TRANSLATE() ((bufp->options&(RE_OPTION_IGNORECASE|RE_MAY_IGNORECASE)) && translate)
/* Fetch the next character in the uncompiled pattern---translating it
if necessary. Also cast from a signed character in the constant
string passed to us by the user to an unsigned char that we can use
as an array index (in, e.g., `translate'). */
#define PATFETCH(c) \
do {if (p == pend) goto end_of_pattern; \
c = (unsigned char) *p++; \
if (TRANSLATE_P()) c = (unsigned char)translate[c]; \
} while (0)
/* Fetch the next character in the uncompiled pattern, with no
translation. */
#define PATFETCH_RAW(c) \
do {if (p == pend) goto end_of_pattern; \
c = (unsigned char)*p++; \
} while (0)
/* Go backwards one character in the pattern. */
#define PATUNFETCH p--
#define MBC2WC(c, p) \
do { \
if (current_mbctype == MBCTYPE_UTF8) { \
int n = mbclen(c) - 1; \
c &= (1<<(BYTEWIDTH-2-n)) - 1; \
while (n--) { \
c = c << 6 | *p++ & ((1<<6)-1); \
} \
} \
else { \
c <<= 8; \
c |= (unsigned char)*(p)++; \
} \
} while (0)
#define PATFETCH_MBC(c) \
do { \
if (p + mbclen(c) - 1 >= pend) goto end_of_pattern; \
MBC2WC(c, p); \
} while(0)
#define WC2MBC1ST(c) \
((c<0x100)?(c):((current_mbctype != MBCTYPE_UTF8)?(((c)>>8)&0xff):utf8_firstbyte(c)))
static unsigned int
utf8_firstbyte(c)
unsigned long c;
{
if (c < 0x80) return c;
if (c <= 0x7ff) return ((c>>6)&0xff)|0xc0;
if (c <= 0xffff) return ((c>>12)&0xff)|0xe0;
if (c <= 0x1fffff) return ((c>>18)&0xff)|0xf0;
if (c <= 0x3ffffff) return ((c>>24)&0xff)|0xf8;
if (c <= 0x7fffffff) return ((c>>30)&0xff)|0xfc;
#if SIZEOF_INT > 4
if (c <= 0xfffffffff) return 0xfe;
#else
return 0xfe;
#endif
}
static void
print_mbc(c)
unsigned int c;
{
if (current_mbctype == MBCTYPE_UTF8) {
if (c < 0x80)
printf("%c", c);
else if (c <= 0x7ff)
printf("%c%c", utf8_firstbyte(c), c&0x3f);
else if (c <= 0xffff)
printf("%c%c%c", utf8_firstbyte(c), (c>>6)&0x3f, c&0x3f);
else if (c <= 0x1fffff)
printf("%c%c%c%c", utf8_firstbyte(c), (c>>12)&0x3f, (c>>6)&0x3f, c&0x3f);
else if (c <= 0x3ffffff)
printf("%c%c%c%c%c", utf8_firstbyte(c), (c>>18)&0x3f, (c>>12)&0x3f, (c>>6)&0x3f, c&0x3f);
else if (c <= 0x7fffffff)
printf("%c%c%c%c%c%c", utf8_firstbyte(c), (c>>24)&0x3f, (c>>18)&0x3f, (c>>12)&0x3f, (c>>6)&0x3f, c&0x3f);
}
else if (c < 0xff) {
printf("\\%o", c);
}
else {
printf("%c%c", c>>BYTEWIDTH, c&0xff);
}
}
/* If the buffer isn't allocated when it comes in, use this. */
#define INIT_BUF_SIZE 28
/* Make sure we have at least N more bytes of space in buffer. */
#define GET_BUFFER_SPACE(n) \
do { \
while (b - bufp->buffer + (n) >= bufp->allocated) \
EXTEND_BUFFER; \
} while (0)
/* Make sure we have one more byte of buffer space and then add CH to it. */
#define BUFPUSH(ch) \
do { \
GET_BUFFER_SPACE(1); \
*b++ = (char)(ch); \
} while (0)
/* Extend the buffer by twice its current size via reallociation and
reset the pointers that pointed into the old allocation to point to
the correct places in the new allocation. If extending the buffer
results in it being larger than 1 << 16, then flag memory exhausted. */
#define EXTEND_BUFFER \
do { char *old_buffer = bufp->buffer; \
if (bufp->allocated == (1L<<16)) goto too_big; \
bufp->allocated *= 2; \
if (bufp->allocated > (1L<<16)) bufp->allocated = (1L<<16); \
bufp->buffer = (char*)xrealloc(bufp->buffer, bufp->allocated); \
if (bufp->buffer == 0) \
goto memory_exhausted; \
b = (b - old_buffer) + bufp->buffer; \
if (fixup_alt_jump) \
fixup_alt_jump = (fixup_alt_jump - old_buffer) + bufp->buffer; \
if (laststart) \
laststart = (laststart - old_buffer) + bufp->buffer; \
begalt = (begalt - old_buffer) + bufp->buffer; \
if (pending_exact) \
pending_exact = (pending_exact - old_buffer) + bufp->buffer; \
} while (0)
/* Set the bit for character C in a character set list. */
#define SET_LIST_BIT(c) \
(b[(unsigned char)(c) / BYTEWIDTH] \
|= 1 << ((unsigned char)(c) % BYTEWIDTH))
/* Get the next unsigned number in the uncompiled pattern. */
#define GET_UNSIGNED_NUMBER(num) \
do { if (p != pend) { \
PATFETCH(c); \
while (ISDIGIT(c)) { \
if (num < 0) \
num = 0; \
num = num * 10 + c - '0'; \
if (p == pend) \
break; \
PATFETCH(c); \
} \
} \
} while (0)
#define STREQ(s1, s2) ((strcmp(s1, s2) == 0))
#define CHAR_CLASS_MAX_LENGTH 6 /* Namely, `xdigit'. */
#define IS_CHAR_CLASS(string) \
(STREQ(string, "alpha") || STREQ(string, "upper") \
|| STREQ(string, "lower") || STREQ(string, "digit") \
|| STREQ(string, "alnum") || STREQ(string, "xdigit") \
|| STREQ(string, "space") || STREQ(string, "print") \
|| STREQ(string, "punct") || STREQ(string, "graph") \
|| STREQ(string, "cntrl") || STREQ(string, "blank"))
#define STORE_MBC(p, c) \
do { \
(p)[0] = (unsigned char)(((c) >>24) & 0xff); \
(p)[1] = (unsigned char)(((c) >>16) & 0xff); \
(p)[2] = (unsigned char)(((c) >> 8) & 0xff); \
(p)[3] = (unsigned char)(((c) >> 0) & 0xff); \
} while (0)
#define STORE_MBC_AND_INCR(p, c) \
do { \
*(p)++ = (unsigned char)(((c) >>24) & 0xff); \
*(p)++ = (unsigned char)(((c) >>16) & 0xff); \
*(p)++ = (unsigned char)(((c) >> 8) & 0xff); \
*(p)++ = (unsigned char)(((c) >> 0) & 0xff); \
} while (0)
#define EXTRACT_MBC(p) \
((unsigned int)((unsigned char)(p)[0] << 24 | \
(unsigned char)(p)[1] << 16 | \
(unsigned char)(p)[2] << 8 | \
(unsigned char)(p)[3]))
#define EXTRACT_MBC_AND_INCR(p) \
((unsigned int)((p) += 4, \
(unsigned char)(p)[-4] << 24 | \
(unsigned char)(p)[-3] << 16 | \
(unsigned char)(p)[-2] << 8 | \
(unsigned char)(p)[-1]))
#define EXTRACT_UNSIGNED(p) \
((unsigned char)(p)[0] | (unsigned char)(p)[1] << 8)
#define EXTRACT_UNSIGNED_AND_INCR(p) \
((p) += 2, (unsigned char)(p)[-2] | (unsigned char)(p)[-1] << 8)
/* Handle (mb)?charset(_not)?.
Structure of mbcharset(_not)? in compiled pattern.
struct {
unsinged char id; mbcharset(_not)?
unsigned char sbc_size;
unsigned char sbc_map[sbc_size]; same as charset(_not)? up to here.
unsigned short mbc_size; number of intervals.
struct {
unsigned long beg; beginning of interval.
unsigned long end; end of interval.
} intervals[mbc_size];
}; */
static void
set_list_bits(c1, c2, b)
unsigned long c1, c2;
unsigned char *b;
{
unsigned char sbc_size = b[-1];
unsigned short mbc_size = EXTRACT_UNSIGNED(&b[sbc_size]);
unsigned short beg, end, upb;
if (c1 > c2)
return;
b = &b[sbc_size + 2];
for (beg = 0, upb = mbc_size; beg < upb; ) {
unsigned short mid = (unsigned short)(beg + upb) >> 1;
if ((int)c1 - 1 > (int)EXTRACT_MBC(&b[mid*8+4]))
beg = mid + 1;
else
upb = mid;
}
for (end = beg, upb = mbc_size; end < upb; ) {
unsigned short mid = (unsigned short)(end + upb) >> 1;
if ((int)c2 >= (int)EXTRACT_MBC(&b[mid*8]) - 1)
end = mid + 1;
else
upb = mid;
}
if (beg != end) {
if (c1 > EXTRACT_MBC(&b[beg*8]))
c1 = EXTRACT_MBC(&b[beg*8]);
if (c2 < EXTRACT_MBC(&b[(end - 1)*8+4]))
c2 = EXTRACT_MBC(&b[(end - 1)*8+4]);
}
if (end < mbc_size && end != beg + 1)
/* NOTE: memcpy() would not work here. */
memmove(&b[(beg + 1)*8], &b[end*8], (mbc_size - end)*8);
STORE_MBC(&b[beg*8 + 0], c1);
STORE_MBC(&b[beg*8 + 4], c2);
mbc_size += beg - end + 1;
STORE_NUMBER(&b[-2], mbc_size);
}
static int
is_in_list(c, b)
unsigned long c;
const unsigned char *b;
{
unsigned short size;
unsigned short i, j;
size = *b++;
if ((int)c / BYTEWIDTH < (int)size && b[c / BYTEWIDTH] & 1 << c % BYTEWIDTH) {
return 1;
}
b += size + 2;
size = EXTRACT_UNSIGNED(&b[-2]);
if (size == 0) return 0;
for (i = 0, j = size; i < j; ) {
unsigned short k = (unsigned short)(i + j) >> 1;
if (c > EXTRACT_MBC(&b[k*8+4]))
i = k + 1;
else
j = k;
}
if (i < size && EXTRACT_MBC(&b[i*8]) <= c
&& ((unsigned char)c != '\n' && (unsigned char)c != '\0'))
return 1;
return 0;
}
static void
print_partial_compiled_pattern(start, end)
unsigned char *start;
unsigned char *end;
{
int mcnt, mcnt2;
unsigned char *p = start;
unsigned char *pend = end;
if (start == NULL) {
printf("(null)\n");
return;
}
/* Loop over pattern commands. */
while (p < pend) {
switch ((enum regexpcode)*p++) {
case unused:
printf("/unused");
break;
case exactn:
mcnt = *p++;
printf("/exactn/%d", mcnt);
do {
putchar('/');
printf("%c", *p++);
}
while (--mcnt);
break;
case start_memory:
mcnt = *p++;
printf("/start_memory/%d/%d", mcnt, *p++);
break;
case stop_memory:
mcnt = *p++;
printf("/stop_memory/%d/%d", mcnt, *p++);
break;
case start_paren:
printf("/start_paren");
break;
case stop_paren:
printf("/stop_paren");
break;
case casefold_on:
printf("/casefold_on");
break;
case casefold_off:
printf("/casefold_off");
break;
case option_set:
printf("/option_set/%d", *p++);
break;
case start_nowidth:
EXTRACT_NUMBER_AND_INCR(mcnt, p);
printf("/start_nowidth//%d", mcnt);
break;
case stop_nowidth:
printf("/stop_nowidth//");
p += 2;
break;
case pop_and_fail:
printf("/pop_and_fail");
break;
case stop_backtrack:
printf("/stop_backtrack//");
p += 2;
break;
case duplicate:
printf("/duplicate/%d", *p++);
break;
case anychar:
printf("/anychar");
break;
case anychar_repeat:
printf("/anychar_repeat");
break;
case charset:
case charset_not:
{
register int c;
printf("/charset%s",
(enum regexpcode)*(p - 1) == charset_not ? "_not" : "");
mcnt = *p++;
printf("/%d", mcnt);
for (c = 0; c < mcnt; c++) {
unsigned bit;
unsigned char map_byte = p[c];
putchar ('/');
for (bit = 0; bit < BYTEWIDTH; bit++)
if (map_byte & (1 << bit))
printf("%c", c * BYTEWIDTH + bit);
}
p += mcnt;
mcnt = EXTRACT_UNSIGNED_AND_INCR(p);
printf("/");
while (mcnt--) {
print_mbc(EXTRACT_MBC_AND_INCR(p));
printf("-");
print_mbc(EXTRACT_MBC_AND_INCR(p));
}
break;
}
case begline:
printf("/begline");
break;
case endline:
printf("/endline");
break;
case on_failure_jump:
EXTRACT_NUMBER_AND_INCR(mcnt, p);
printf("/on_failure_jump//%d", mcnt);
break;
case dummy_failure_jump:
EXTRACT_NUMBER_AND_INCR(mcnt, p);
printf("/dummy_failure_jump//%d", mcnt);
break;
case push_dummy_failure:
printf("/push_dummy_failure");
break;
case finalize_jump:
EXTRACT_NUMBER_AND_INCR(mcnt, p);
printf("/finalize_jump//%d", mcnt);
break;
case maybe_finalize_jump:
EXTRACT_NUMBER_AND_INCR(mcnt, p);
printf("/maybe_finalize_jump//%d", mcnt);
break;
case jump_past_alt:
EXTRACT_NUMBER_AND_INCR(mcnt, p);
printf("/jump_past_alt//%d", mcnt);
break;
case jump:
EXTRACT_NUMBER_AND_INCR(mcnt, p);
printf("/jump//%d", mcnt);
break;
case succeed_n:
EXTRACT_NUMBER_AND_INCR(mcnt, p);
EXTRACT_NUMBER_AND_INCR(mcnt2, p);
printf("/succeed_n//%d//%d", mcnt, mcnt2);
break;
case jump_n:
EXTRACT_NUMBER_AND_INCR(mcnt, p);
EXTRACT_NUMBER_AND_INCR(mcnt2, p);
printf("/jump_n//%d//%d", mcnt, mcnt2);
break;
case set_number_at:
EXTRACT_NUMBER_AND_INCR(mcnt, p);
EXTRACT_NUMBER_AND_INCR(mcnt2, p);
printf("/set_number_at//%d//%d", mcnt, mcnt2);
break;
case try_next:
EXTRACT_NUMBER_AND_INCR(mcnt, p);
printf("/try_next//%d", mcnt);
break;
case finalize_push:
EXTRACT_NUMBER_AND_INCR(mcnt, p);
printf("/finalize_push//%d", mcnt);
break;
case finalize_push_n:
EXTRACT_NUMBER_AND_INCR(mcnt, p);
EXTRACT_NUMBER_AND_INCR(mcnt2, p);
printf("/finalize_push_n//%d//%d", mcnt, mcnt2);
break;
case wordbound:
printf("/wordbound");
break;
case notwordbound:
printf("/notwordbound");
break;
case wordbeg:
printf("/wordbeg");
break;
case wordend:
printf("/wordend");
case wordchar:
printf("/wordchar");
break;
case notwordchar:
printf("/notwordchar");
break;
case begbuf:
printf("/begbuf");
break;
case endbuf:
printf("/endbuf");
break;
case endbuf2:
printf("/endbuf2");
break;
case begpos:
printf("/begpos");
break;
default:
printf("?%d", *(p-1));
}
}
printf("/\n");
}
static void
print_compiled_pattern(bufp)
struct re_pattern_buffer *bufp;
{
unsigned char *buffer = (unsigned char*)bufp->buffer;
print_partial_compiled_pattern(buffer, buffer + bufp->used);
}
static char*
calculate_must_string(start, end)
char *start;
char *end;
{
int mcnt;
int max = 0;
char *p = start;
char *pend = end;
char *must = 0;
if (start == NULL) return 0;
/* Loop over pattern commands. */
while (p < pend) {
switch ((enum regexpcode)*p++) {
case unused:
break;
case exactn:
mcnt = *p;
if (mcnt > max) {
must = p;
max = mcnt;
}