mirror of
https://github.com/darlinghq/darling-gdb.git
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0d98155c94
Irix 5 has a standard _sigtramp signal handler. * irix5-nat.c (solib_add): Get rid of sigtramp_address handling, it is not needed for a standard _sigtramp signal handler. Add shared library sections to the section table of the target before adding the symbols. * mips-tdep.c (mips_skip_prologue): Do not skip load immediate instructions that do not prepare a stack adjustment. * regex.c (SIGN_EXTEND_CHAR): Update to emacs-19.25 definition, which does the right thing on machines where `char' is unsigned.
1745 lines
46 KiB
C
1745 lines
46 KiB
C
/* Extended regular expression matching and search library.
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Copyright (C) 1985, 1989 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* To test, compile with -Dtest.
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This Dtestable feature turns this into a self-contained program
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which reads a pattern, describes how it compiles,
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then reads a string and searches for it. */
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#ifdef emacs
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/* The `emacs' switch turns on certain special matching commands
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that make sense only in emacs. */
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#include "config.h"
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#include "lisp.h"
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#include "buffer.h"
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#include "syntax.h"
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#else /* not emacs */
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#include "defs.h"
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#include <string.h>
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/*
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* Define the syntax stuff, so we can do the \<...\> things.
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*/
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#ifndef Sword /* must be non-zero in some of the tests below... */
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#define Sword 1
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#endif
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#define SYNTAX(c) re_syntax_table[c]
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#ifdef SYNTAX_TABLE
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char *re_syntax_table;
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#else
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static char re_syntax_table[256];
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static void
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init_syntax_once ()
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{
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register int c;
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static int done = 0;
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if (done)
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return;
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memset (re_syntax_table, '\0', sizeof re_syntax_table);
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for (c = 'a'; c <= 'z'; c++)
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re_syntax_table[c] = Sword;
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for (c = 'A'; c <= 'Z'; c++)
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re_syntax_table[c] = Sword;
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for (c = '0'; c <= '9'; c++)
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re_syntax_table[c] = Sword;
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done = 1;
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}
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#endif /* SYNTAX_TABLE */
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#endif /* not emacs */
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#include "regex.h"
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/* Number of failure points to allocate space for initially,
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when matching. If this number is exceeded, more space is allocated,
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so it is not a hard limit. */
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#ifndef NFAILURES
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#define NFAILURES 80
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#endif /* NFAILURES */
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/* width of a byte in bits */
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#define BYTEWIDTH 8
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/* We remove any previous definition of `SIGN_EXTEND_CHAR',
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since ours (we hope) works properly with all combinations of
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machines, compilers, `char' and `unsigned char' argument types.
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(Per Bothner suggested the basic approach.) */
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#undef SIGN_EXTEND_CHAR
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#if __STDC__
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#define SIGN_EXTEND_CHAR(c) ((signed char) (c))
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#else /* not __STDC__ */
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/* As in Harbison and Steele. */
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#define SIGN_EXTEND_CHAR(c) ((((unsigned char) (c)) ^ 128) - 128)
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#endif
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static int obscure_syntax = 0;
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/* Specify the precise syntax of regexp for compilation.
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This provides for compatibility for various utilities
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which historically have different, incompatible syntaxes.
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The argument SYNTAX is a bit-mask containing the two bits
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RE_NO_BK_PARENS and RE_NO_BK_VBAR. */
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int
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re_set_syntax (syntax)
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int syntax;
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{
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int ret;
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ret = obscure_syntax;
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obscure_syntax = syntax;
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return ret;
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}
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/* re_compile_pattern takes a regular-expression string
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and converts it into a buffer full of byte commands for matching.
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PATTERN is the address of the pattern string
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SIZE is the length of it.
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BUFP is a struct re_pattern_buffer * which points to the info
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on where to store the byte commands.
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This structure contains a char * which points to the
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actual space, which should have been obtained with malloc.
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re_compile_pattern may use realloc to grow the buffer space.
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The number of bytes of commands can be found out by looking in
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the struct re_pattern_buffer that bufp pointed to,
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after re_compile_pattern returns.
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*/
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#define PATPUSH(ch) (*b++ = (char) (ch))
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#define PATFETCH(c) \
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{if (p == pend) goto end_of_pattern; \
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c = * (unsigned char *) p++; \
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if (translate) c = translate[c]; }
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#define PATFETCH_RAW(c) \
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{if (p == pend) goto end_of_pattern; \
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c = * (unsigned char *) p++; }
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#define PATUNFETCH p--
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/* This is not an arbitrary limit: the arguments which represent offsets
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into the pattern are two bytes long. So if 2^16 bytes turns out to
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be too small, many things would have to change. */
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#define MAX_BUF_SIZE (1 << 16)
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/* Extend the buffer by twice its current size via realloc and
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reset the pointers that pointed into the old block to point to the
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correct places in the new one. If extending the buffer results in it
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being larger than MAX_BUF_SIZE, then flag memory exhausted. */
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#define EXTEND_BUFFER \
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do { \
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char *old_buffer = bufp->buffer; \
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if (bufp->allocated == MAX_BUF_SIZE) \
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goto too_big; \
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bufp->allocated <<= 1; \
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if (bufp->allocated > MAX_BUF_SIZE) \
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bufp->allocated = MAX_BUF_SIZE; \
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bufp->buffer = (char *) realloc (bufp->buffer, bufp->allocated);\
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if (bufp->buffer == NULL) \
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goto memory_exhausted; \
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/* If the buffer moved, move all the pointers into it. */ \
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if (old_buffer != bufp->buffer) \
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{ \
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b = (b - old_buffer) + bufp->buffer; \
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begalt = (begalt - old_buffer) + bufp->buffer; \
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if (fixup_jump) \
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fixup_jump = (fixup_jump - old_buffer) + bufp->buffer;\
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if (laststart) \
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laststart = (laststart - old_buffer) + bufp->buffer; \
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if (pending_exact) \
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pending_exact = (pending_exact - old_buffer) + bufp->buffer; \
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} \
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} while (0)
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static void store_jump (), insert_jump ();
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char *
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re_compile_pattern (pattern, size, bufp)
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char *pattern;
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int size;
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struct re_pattern_buffer *bufp;
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{
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register char *b = bufp->buffer;
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register char *p = pattern;
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char *pend = pattern + size;
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register unsigned c, c1;
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char *p1;
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unsigned char *translate = (unsigned char *) bufp->translate;
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/* address of the count-byte of the most recently inserted "exactn" command.
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This makes it possible to tell whether a new exact-match character
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can be added to that command or requires a new "exactn" command. */
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char *pending_exact = 0;
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/* address of the place where a forward-jump should go
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to the end of the containing expression.
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Each alternative of an "or", except the last, ends with a forward-jump
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of this sort. */
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char *fixup_jump = 0;
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/* address of start of the most recently finished expression.
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This tells postfix * where to find the start of its operand. */
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char *laststart = 0;
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/* In processing a repeat, 1 means zero matches is allowed */
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char zero_times_ok;
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/* In processing a repeat, 1 means many matches is allowed */
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char many_times_ok;
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/* address of beginning of regexp, or inside of last \( */
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char *begalt = b;
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/* Stack of information saved by \( and restored by \).
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Four stack elements are pushed by each \(:
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First, the value of b.
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Second, the value of fixup_jump.
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Third, the value of regnum.
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Fourth, the value of begalt. */
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int stackb[40];
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int *stackp = stackb;
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int *stacke = stackb + 40;
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int *stackt;
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/* Counts \('s as they are encountered. Remembered for the matching \),
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where it becomes the "register number" to put in the stop_memory command */
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int regnum = 1;
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bufp->fastmap_accurate = 0;
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#ifndef emacs
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#ifndef SYNTAX_TABLE
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/*
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* Initialize the syntax table.
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*/
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init_syntax_once();
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#endif
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#endif
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if (bufp->allocated == 0)
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{
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bufp->allocated = 28;
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if (bufp->buffer)
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/* EXTEND_BUFFER loses when bufp->allocated is 0 */
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bufp->buffer = (char *) realloc (bufp->buffer, 28);
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else
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/* Caller did not allocate a buffer. Do it for him */
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bufp->buffer = (char *) malloc (28);
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if (!bufp->buffer) goto memory_exhausted;
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begalt = b = bufp->buffer;
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}
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while (p != pend)
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{
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if (b - bufp->buffer > bufp->allocated - 10)
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/* Note that EXTEND_BUFFER clobbers c */
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EXTEND_BUFFER;
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PATFETCH (c);
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switch (c)
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{
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case '$':
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if (obscure_syntax & RE_TIGHT_VBAR)
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{
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if (! (obscure_syntax & RE_CONTEXT_INDEP_OPS) && p != pend)
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goto normal_char;
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/* Make operand of last vbar end before this `$'. */
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if (fixup_jump)
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store_jump (fixup_jump, jump, b);
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fixup_jump = 0;
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PATPUSH (endline);
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break;
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}
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/* $ means succeed if at end of line, but only in special contexts.
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If randomly in the middle of a pattern, it is a normal character. */
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if (p == pend || *p == '\n'
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|| (obscure_syntax & RE_CONTEXT_INDEP_OPS)
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|| (obscure_syntax & RE_NO_BK_PARENS
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? *p == ')'
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: *p == '\\' && p[1] == ')')
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|| (obscure_syntax & RE_NO_BK_VBAR
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? *p == '|'
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: *p == '\\' && p[1] == '|'))
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{
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PATPUSH (endline);
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break;
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}
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goto normal_char;
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case '^':
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/* ^ means succeed if at beg of line, but only if no preceding pattern. */
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if (laststart && p[-2] != '\n'
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&& ! (obscure_syntax & RE_CONTEXT_INDEP_OPS))
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goto normal_char;
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if (obscure_syntax & RE_TIGHT_VBAR)
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{
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if (p != pattern + 1
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&& ! (obscure_syntax & RE_CONTEXT_INDEP_OPS))
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goto normal_char;
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PATPUSH (begline);
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begalt = b;
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}
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else
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PATPUSH (begline);
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break;
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||
|
||
case '+':
|
||
case '?':
|
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if (obscure_syntax & RE_BK_PLUS_QM)
|
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goto normal_char;
|
||
handle_plus:
|
||
case '*':
|
||
/* If there is no previous pattern, char not special. */
|
||
if (!laststart && ! (obscure_syntax & RE_CONTEXT_INDEP_OPS))
|
||
goto normal_char;
|
||
/* If there is a sequence of repetition chars,
|
||
collapse it down to equivalent to just one. */
|
||
zero_times_ok = 0;
|
||
many_times_ok = 0;
|
||
while (1)
|
||
{
|
||
zero_times_ok |= c != '+';
|
||
many_times_ok |= c != '?';
|
||
if (p == pend)
|
||
break;
|
||
PATFETCH (c);
|
||
if (c == '*')
|
||
;
|
||
else if (!(obscure_syntax & RE_BK_PLUS_QM)
|
||
&& (c == '+' || c == '?'))
|
||
;
|
||
else if ((obscure_syntax & RE_BK_PLUS_QM)
|
||
&& c == '\\')
|
||
{
|
||
int c1;
|
||
PATFETCH (c1);
|
||
if (!(c1 == '+' || c1 == '?'))
|
||
{
|
||
PATUNFETCH;
|
||
PATUNFETCH;
|
||
break;
|
||
}
|
||
c = c1;
|
||
}
|
||
else
|
||
{
|
||
PATUNFETCH;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Star, etc. applied to an empty pattern is equivalent
|
||
to an empty pattern. */
|
||
if (!laststart)
|
||
break;
|
||
|
||
/* Now we know whether 0 matches is allowed,
|
||
and whether 2 or more matches is allowed. */
|
||
if (many_times_ok)
|
||
{
|
||
/* If more than one repetition is allowed,
|
||
put in a backward jump at the end. */
|
||
store_jump (b, maybe_finalize_jump, laststart - 3);
|
||
b += 3;
|
||
}
|
||
insert_jump (on_failure_jump, laststart, b + 3, b);
|
||
pending_exact = 0;
|
||
b += 3;
|
||
if (!zero_times_ok)
|
||
{
|
||
/* At least one repetition required: insert before the loop
|
||
a skip over the initial on-failure-jump instruction */
|
||
insert_jump (dummy_failure_jump, laststart, laststart + 6, b);
|
||
b += 3;
|
||
}
|
||
break;
|
||
|
||
case '.':
|
||
laststart = b;
|
||
PATPUSH (anychar);
|
||
break;
|
||
|
||
case '[':
|
||
while (b - bufp->buffer
|
||
> bufp->allocated - 3 - (1 << BYTEWIDTH) / BYTEWIDTH)
|
||
/* Note that EXTEND_BUFFER clobbers c */
|
||
EXTEND_BUFFER;
|
||
|
||
laststart = b;
|
||
if (*p == '^')
|
||
PATPUSH (charset_not), p++;
|
||
else
|
||
PATPUSH (charset);
|
||
p1 = p;
|
||
|
||
PATPUSH ((1 << BYTEWIDTH) / BYTEWIDTH);
|
||
/* Clear the whole map */
|
||
memset (b, '\0', (1 << BYTEWIDTH) / BYTEWIDTH);
|
||
/* Read in characters and ranges, setting map bits */
|
||
while (1)
|
||
{
|
||
PATFETCH (c);
|
||
if (c == ']' && p != p1 + 1) break;
|
||
if (*p == '-' && p[1] != ']')
|
||
{
|
||
PATFETCH (c1);
|
||
PATFETCH (c1);
|
||
while (c <= c1)
|
||
b[c / BYTEWIDTH] |= 1 << (c % BYTEWIDTH), c++;
|
||
}
|
||
else
|
||
{
|
||
b[c / BYTEWIDTH] |= 1 << (c % BYTEWIDTH);
|
||
}
|
||
}
|
||
/* Discard any bitmap bytes that are all 0 at the end of the map.
|
||
Decrement the map-length byte too. */
|
||
while ((int) b[-1] > 0 && b[b[-1] - 1] == 0)
|
||
b[-1]--;
|
||
b += b[-1];
|
||
break;
|
||
|
||
case '(':
|
||
if (! (obscure_syntax & RE_NO_BK_PARENS))
|
||
goto normal_char;
|
||
else
|
||
goto handle_open;
|
||
|
||
case ')':
|
||
if (! (obscure_syntax & RE_NO_BK_PARENS))
|
||
goto normal_char;
|
||
else
|
||
goto handle_close;
|
||
|
||
case '\n':
|
||
if (! (obscure_syntax & RE_NEWLINE_OR))
|
||
goto normal_char;
|
||
else
|
||
goto handle_bar;
|
||
|
||
case '|':
|
||
if (! (obscure_syntax & RE_NO_BK_VBAR))
|
||
goto normal_char;
|
||
else
|
||
goto handle_bar;
|
||
|
||
case '\\':
|
||
if (p == pend) goto invalid_pattern;
|
||
PATFETCH_RAW (c);
|
||
switch (c)
|
||
{
|
||
case '(':
|
||
if (obscure_syntax & RE_NO_BK_PARENS)
|
||
goto normal_backsl;
|
||
handle_open:
|
||
if (stackp == stacke) goto nesting_too_deep;
|
||
if (regnum < RE_NREGS)
|
||
{
|
||
PATPUSH (start_memory);
|
||
PATPUSH (regnum);
|
||
}
|
||
*stackp++ = b - bufp->buffer;
|
||
*stackp++ = fixup_jump ? fixup_jump - bufp->buffer + 1 : 0;
|
||
*stackp++ = regnum++;
|
||
*stackp++ = begalt - bufp->buffer;
|
||
fixup_jump = 0;
|
||
laststart = 0;
|
||
begalt = b;
|
||
break;
|
||
|
||
case ')':
|
||
if (obscure_syntax & RE_NO_BK_PARENS)
|
||
goto normal_backsl;
|
||
handle_close:
|
||
if (stackp == stackb) goto unmatched_close;
|
||
begalt = *--stackp + bufp->buffer;
|
||
if (fixup_jump)
|
||
store_jump (fixup_jump, jump, b);
|
||
if (stackp[-1] < RE_NREGS)
|
||
{
|
||
PATPUSH (stop_memory);
|
||
PATPUSH (stackp[-1]);
|
||
}
|
||
stackp -= 2;
|
||
fixup_jump = 0;
|
||
if (*stackp)
|
||
fixup_jump = *stackp + bufp->buffer - 1;
|
||
laststart = *--stackp + bufp->buffer;
|
||
break;
|
||
|
||
case '|':
|
||
if (obscure_syntax & RE_NO_BK_VBAR)
|
||
goto normal_backsl;
|
||
handle_bar:
|
||
insert_jump (on_failure_jump, begalt, b + 6, b);
|
||
pending_exact = 0;
|
||
b += 3;
|
||
if (fixup_jump)
|
||
store_jump (fixup_jump, jump, b);
|
||
fixup_jump = b;
|
||
b += 3;
|
||
laststart = 0;
|
||
begalt = b;
|
||
break;
|
||
|
||
#ifdef emacs
|
||
case '=':
|
||
PATPUSH (at_dot);
|
||
break;
|
||
|
||
case 's':
|
||
laststart = b;
|
||
PATPUSH (syntaxspec);
|
||
PATFETCH (c);
|
||
PATPUSH (syntax_spec_code[c]);
|
||
break;
|
||
|
||
case 'S':
|
||
laststart = b;
|
||
PATPUSH (notsyntaxspec);
|
||
PATFETCH (c);
|
||
PATPUSH (syntax_spec_code[c]);
|
||
break;
|
||
#endif /* emacs */
|
||
|
||
case 'w':
|
||
laststart = b;
|
||
PATPUSH (wordchar);
|
||
break;
|
||
|
||
case 'W':
|
||
laststart = b;
|
||
PATPUSH (notwordchar);
|
||
break;
|
||
|
||
case '<':
|
||
PATPUSH (wordbeg);
|
||
break;
|
||
|
||
case '>':
|
||
PATPUSH (wordend);
|
||
break;
|
||
|
||
case 'b':
|
||
PATPUSH (wordbound);
|
||
break;
|
||
|
||
case 'B':
|
||
PATPUSH (notwordbound);
|
||
break;
|
||
|
||
case '`':
|
||
PATPUSH (begbuf);
|
||
break;
|
||
|
||
case '\'':
|
||
PATPUSH (endbuf);
|
||
break;
|
||
|
||
case '1':
|
||
case '2':
|
||
case '3':
|
||
case '4':
|
||
case '5':
|
||
case '6':
|
||
case '7':
|
||
case '8':
|
||
case '9':
|
||
c1 = c - '0';
|
||
if (c1 >= regnum)
|
||
goto normal_char;
|
||
for (stackt = stackp - 2; stackt > stackb; stackt -= 4)
|
||
if (*stackt == c1)
|
||
goto normal_char;
|
||
laststart = b;
|
||
PATPUSH (duplicate);
|
||
PATPUSH (c1);
|
||
break;
|
||
|
||
case '+':
|
||
case '?':
|
||
if (obscure_syntax & RE_BK_PLUS_QM)
|
||
goto handle_plus;
|
||
|
||
default:
|
||
normal_backsl:
|
||
/* You might think it would be useful for \ to mean
|
||
not to translate; but if we don't translate it
|
||
it will never match anything. */
|
||
if (translate) c = translate[c];
|
||
goto normal_char;
|
||
}
|
||
break;
|
||
|
||
default:
|
||
normal_char:
|
||
if (!pending_exact || pending_exact + *pending_exact + 1 != b
|
||
|| *pending_exact == 0177 || *p == '*' || *p == '^'
|
||
|| ((obscure_syntax & RE_BK_PLUS_QM)
|
||
? *p == '\\' && (p[1] == '+' || p[1] == '?')
|
||
: (*p == '+' || *p == '?')))
|
||
{
|
||
laststart = b;
|
||
PATPUSH (exactn);
|
||
pending_exact = b;
|
||
PATPUSH (0);
|
||
}
|
||
PATPUSH (c);
|
||
(*pending_exact)++;
|
||
}
|
||
}
|
||
|
||
if (fixup_jump)
|
||
store_jump (fixup_jump, jump, b);
|
||
|
||
if (stackp != stackb) goto unmatched_open;
|
||
|
||
bufp->used = b - bufp->buffer;
|
||
return 0;
|
||
|
||
invalid_pattern:
|
||
return "Invalid regular expression";
|
||
|
||
unmatched_open:
|
||
return "Unmatched \\(";
|
||
|
||
unmatched_close:
|
||
return "Unmatched \\)";
|
||
|
||
end_of_pattern:
|
||
return "Premature end of regular expression";
|
||
|
||
nesting_too_deep:
|
||
return "Nesting too deep";
|
||
|
||
too_big:
|
||
return "Regular expression too big";
|
||
|
||
memory_exhausted:
|
||
return "Memory exhausted";
|
||
}
|
||
|
||
/* Store where `from' points a jump operation to jump to where `to' points.
|
||
`opcode' is the opcode to store. */
|
||
|
||
static void
|
||
store_jump (from, opcode, to)
|
||
char *from, *to;
|
||
char opcode;
|
||
{
|
||
from[0] = opcode;
|
||
from[1] = (to - (from + 3)) & 0377;
|
||
from[2] = (to - (from + 3)) >> 8;
|
||
}
|
||
|
||
/* Open up space at char FROM, and insert there a jump to TO.
|
||
CURRENT_END gives te end of the storage no in use,
|
||
so we know how much data to copy up.
|
||
OP is the opcode of the jump to insert.
|
||
|
||
If you call this function, you must zero out pending_exact. */
|
||
|
||
static void
|
||
insert_jump (op, from, to, current_end)
|
||
char op;
|
||
char *from, *to, *current_end;
|
||
{
|
||
register char *pto = current_end + 3;
|
||
register char *pfrom = current_end;
|
||
while (pfrom != from)
|
||
*--pto = *--pfrom;
|
||
store_jump (from, op, to);
|
||
}
|
||
|
||
/* Given a pattern, compute a fastmap from it.
|
||
The fastmap records which of the (1 << BYTEWIDTH) possible characters
|
||
can start a string that matches the pattern.
|
||
This fastmap is used by re_search to skip quickly over totally implausible text.
|
||
|
||
The caller must supply the address of a (1 << BYTEWIDTH)-byte data area
|
||
as bufp->fastmap.
|
||
The other components of bufp describe the pattern to be used. */
|
||
|
||
void
|
||
re_compile_fastmap (bufp)
|
||
struct re_pattern_buffer *bufp;
|
||
{
|
||
unsigned char *pattern = (unsigned char *) bufp->buffer;
|
||
int size = bufp->used;
|
||
register char *fastmap = bufp->fastmap;
|
||
register unsigned char *p = pattern;
|
||
register unsigned char *pend = pattern + size;
|
||
register int j;
|
||
unsigned char *translate = (unsigned char *) bufp->translate;
|
||
|
||
unsigned char *stackb[NFAILURES];
|
||
unsigned char **stackp = stackb;
|
||
|
||
memset (fastmap, '\0', (1 << BYTEWIDTH));
|
||
bufp->fastmap_accurate = 1;
|
||
bufp->can_be_null = 0;
|
||
|
||
while (p)
|
||
{
|
||
if (p == pend)
|
||
{
|
||
bufp->can_be_null = 1;
|
||
break;
|
||
}
|
||
#ifdef SWITCH_ENUM_BUG
|
||
switch ((int) ((enum regexpcode) *p++))
|
||
#else
|
||
switch ((enum regexpcode) *p++)
|
||
#endif
|
||
{
|
||
case exactn:
|
||
if (translate)
|
||
fastmap[translate[p[1]]] = 1;
|
||
else
|
||
fastmap[p[1]] = 1;
|
||
break;
|
||
|
||
case begline:
|
||
case before_dot:
|
||
case at_dot:
|
||
case after_dot:
|
||
case begbuf:
|
||
case endbuf:
|
||
case wordbound:
|
||
case notwordbound:
|
||
case wordbeg:
|
||
case wordend:
|
||
continue;
|
||
|
||
case endline:
|
||
if (translate)
|
||
fastmap[translate['\n']] = 1;
|
||
else
|
||
fastmap['\n'] = 1;
|
||
if (bufp->can_be_null != 1)
|
||
bufp->can_be_null = 2;
|
||
break;
|
||
|
||
case finalize_jump:
|
||
case maybe_finalize_jump:
|
||
case jump:
|
||
case dummy_failure_jump:
|
||
bufp->can_be_null = 1;
|
||
j = *p++ & 0377;
|
||
j += SIGN_EXTEND_CHAR (*(char *)p) << 8;
|
||
p += j + 1; /* The 1 compensates for missing ++ above */
|
||
if (j > 0)
|
||
continue;
|
||
/* Jump backward reached implies we just went through
|
||
the body of a loop and matched nothing.
|
||
Opcode jumped to should be an on_failure_jump.
|
||
Just treat it like an ordinary jump.
|
||
For a * loop, it has pushed its failure point already;
|
||
if so, discard that as redundant. */
|
||
if ((enum regexpcode) *p != on_failure_jump)
|
||
continue;
|
||
p++;
|
||
j = *p++ & 0377;
|
||
j += SIGN_EXTEND_CHAR (*(char *)p) << 8;
|
||
p += j + 1; /* The 1 compensates for missing ++ above */
|
||
if (stackp != stackb && *stackp == p)
|
||
stackp--;
|
||
continue;
|
||
|
||
case on_failure_jump:
|
||
j = *p++ & 0377;
|
||
j += SIGN_EXTEND_CHAR (*(char *)p) << 8;
|
||
p++;
|
||
*++stackp = p + j;
|
||
continue;
|
||
|
||
case start_memory:
|
||
case stop_memory:
|
||
p++;
|
||
continue;
|
||
|
||
case duplicate:
|
||
bufp->can_be_null = 1;
|
||
fastmap['\n'] = 1;
|
||
case anychar:
|
||
for (j = 0; j < (1 << BYTEWIDTH); j++)
|
||
if (j != '\n')
|
||
fastmap[j] = 1;
|
||
if (bufp->can_be_null)
|
||
return;
|
||
/* Don't return; check the alternative paths
|
||
so we can set can_be_null if appropriate. */
|
||
break;
|
||
|
||
case wordchar:
|
||
for (j = 0; j < (1 << BYTEWIDTH); j++)
|
||
if (SYNTAX (j) == Sword)
|
||
fastmap[j] = 1;
|
||
break;
|
||
|
||
case notwordchar:
|
||
for (j = 0; j < (1 << BYTEWIDTH); j++)
|
||
if (SYNTAX (j) != Sword)
|
||
fastmap[j] = 1;
|
||
break;
|
||
|
||
#ifdef emacs
|
||
case syntaxspec:
|
||
k = *p++;
|
||
for (j = 0; j < (1 << BYTEWIDTH); j++)
|
||
if (SYNTAX (j) == (enum syntaxcode) k)
|
||
fastmap[j] = 1;
|
||
break;
|
||
|
||
case notsyntaxspec:
|
||
k = *p++;
|
||
for (j = 0; j < (1 << BYTEWIDTH); j++)
|
||
if (SYNTAX (j) != (enum syntaxcode) k)
|
||
fastmap[j] = 1;
|
||
break;
|
||
#endif /* emacs */
|
||
|
||
case charset:
|
||
for (j = *p++ * BYTEWIDTH - 1; j >= 0; j--)
|
||
if (p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH)))
|
||
{
|
||
if (translate)
|
||
fastmap[translate[j]] = 1;
|
||
else
|
||
fastmap[j] = 1;
|
||
}
|
||
break;
|
||
|
||
case charset_not:
|
||
/* Chars beyond end of map must be allowed */
|
||
for (j = *p * BYTEWIDTH; j < (1 << BYTEWIDTH); j++)
|
||
if (translate)
|
||
fastmap[translate[j]] = 1;
|
||
else
|
||
fastmap[j] = 1;
|
||
|
||
for (j = *p++ * BYTEWIDTH - 1; j >= 0; j--)
|
||
if (!(p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH))))
|
||
{
|
||
if (translate)
|
||
fastmap[translate[j]] = 1;
|
||
else
|
||
fastmap[j] = 1;
|
||
}
|
||
break;
|
||
}
|
||
|
||
/* Get here means we have successfully found the possible starting characters
|
||
of one path of the pattern. We need not follow this path any farther.
|
||
Instead, look at the next alternative remembered in the stack. */
|
||
if (stackp != stackb)
|
||
p = *stackp--;
|
||
else
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Like re_search_2, below, but only one string is specified. */
|
||
|
||
int
|
||
re_search (pbufp, string, size, startpos, range, regs)
|
||
struct re_pattern_buffer *pbufp;
|
||
char *string;
|
||
int size, startpos, range;
|
||
struct re_registers *regs;
|
||
{
|
||
return re_search_2 (pbufp, 0, 0, string, size, startpos, range, regs, size);
|
||
}
|
||
|
||
/* Like re_match_2 but tries first a match starting at index STARTPOS,
|
||
then at STARTPOS + 1, and so on.
|
||
RANGE is the number of places to try before giving up.
|
||
If RANGE is negative, the starting positions tried are
|
||
STARTPOS, STARTPOS - 1, etc.
|
||
It is up to the caller to make sure that range is not so large
|
||
as to take the starting position outside of the input strings.
|
||
|
||
The value returned is the position at which the match was found,
|
||
or -1 if no match was found,
|
||
or -2 if error (such as failure stack overflow). */
|
||
|
||
int
|
||
re_search_2 (pbufp, string1, size1, string2, size2, startpos, range, regs, mstop)
|
||
struct re_pattern_buffer *pbufp;
|
||
char *string1, *string2;
|
||
int size1, size2;
|
||
int startpos;
|
||
register int range;
|
||
struct re_registers *regs;
|
||
int mstop;
|
||
{
|
||
register char *fastmap = pbufp->fastmap;
|
||
register unsigned char *translate = (unsigned char *) pbufp->translate;
|
||
int total = size1 + size2;
|
||
int val;
|
||
|
||
/* Update the fastmap now if not correct already */
|
||
if (fastmap && !pbufp->fastmap_accurate)
|
||
re_compile_fastmap (pbufp);
|
||
|
||
/* Don't waste time in a long search for a pattern
|
||
that says it is anchored. */
|
||
if (pbufp->used > 0 && (enum regexpcode) pbufp->buffer[0] == begbuf
|
||
&& range > 0)
|
||
{
|
||
if (startpos > 0)
|
||
return -1;
|
||
else
|
||
range = 1;
|
||
}
|
||
|
||
while (1)
|
||
{
|
||
/* If a fastmap is supplied, skip quickly over characters
|
||
that cannot possibly be the start of a match.
|
||
Note, however, that if the pattern can possibly match
|
||
the null string, we must test it at each starting point
|
||
so that we take the first null string we get. */
|
||
|
||
if (fastmap && startpos < total && pbufp->can_be_null != 1)
|
||
{
|
||
if (range > 0)
|
||
{
|
||
register int lim = 0;
|
||
register unsigned char *p;
|
||
int irange = range;
|
||
if (startpos < size1 && startpos + range >= size1)
|
||
lim = range - (size1 - startpos);
|
||
|
||
p = ((unsigned char *)
|
||
&(startpos >= size1 ? string2 - size1 : string1)[startpos]);
|
||
|
||
if (translate)
|
||
{
|
||
while (range > lim && !fastmap[translate[*p++]])
|
||
range--;
|
||
}
|
||
else
|
||
{
|
||
while (range > lim && !fastmap[*p++])
|
||
range--;
|
||
}
|
||
startpos += irange - range;
|
||
}
|
||
else
|
||
{
|
||
register unsigned char c;
|
||
if (startpos >= size1)
|
||
c = string2[startpos - size1];
|
||
else
|
||
c = string1[startpos];
|
||
c &= 0xff;
|
||
if (translate ? !fastmap[translate[c]] : !fastmap[c])
|
||
goto advance;
|
||
}
|
||
}
|
||
|
||
if (range >= 0 && startpos == total
|
||
&& fastmap && pbufp->can_be_null == 0)
|
||
return -1;
|
||
|
||
val = re_match_2 (pbufp, string1, size1, string2, size2, startpos, regs, mstop);
|
||
if (0 <= val)
|
||
{
|
||
if (val == -2)
|
||
return -2;
|
||
return startpos;
|
||
}
|
||
|
||
#ifdef C_ALLOCA
|
||
alloca (0);
|
||
#endif /* C_ALLOCA */
|
||
|
||
advance:
|
||
if (!range) break;
|
||
if (range > 0) range--, startpos++; else range++, startpos--;
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
#ifndef emacs /* emacs never uses this */
|
||
int
|
||
re_match (pbufp, string, size, pos, regs)
|
||
struct re_pattern_buffer *pbufp;
|
||
char *string;
|
||
int size, pos;
|
||
struct re_registers *regs;
|
||
{
|
||
return re_match_2 (pbufp, 0, 0, string, size, pos, regs, size);
|
||
}
|
||
#endif /* emacs */
|
||
|
||
/* Maximum size of failure stack. Beyond this, overflow is an error. */
|
||
|
||
int re_max_failures = 2000;
|
||
|
||
static int memcmp_translate();
|
||
/* Match the pattern described by PBUFP
|
||
against data which is the virtual concatenation of STRING1 and STRING2.
|
||
SIZE1 and SIZE2 are the sizes of the two data strings.
|
||
Start the match at position POS.
|
||
Do not consider matching past the position MSTOP.
|
||
|
||
If pbufp->fastmap is nonzero, then it had better be up to date.
|
||
|
||
The reason that the data to match are specified as two components
|
||
which are to be regarded as concatenated
|
||
is so this function can be used directly on the contents of an Emacs buffer.
|
||
|
||
-1 is returned if there is no match. -2 is returned if there is
|
||
an error (such as match stack overflow). Otherwise the value is the length
|
||
of the substring which was matched. */
|
||
|
||
int
|
||
re_match_2 (pbufp, string1, size1, string2, size2, pos, regs, mstop)
|
||
struct re_pattern_buffer *pbufp;
|
||
unsigned char *string1, *string2;
|
||
int size1, size2;
|
||
int pos;
|
||
struct re_registers *regs;
|
||
int mstop;
|
||
{
|
||
register unsigned char *p = (unsigned char *) pbufp->buffer;
|
||
register unsigned char *pend = p + pbufp->used;
|
||
/* End of first string */
|
||
unsigned char *end1;
|
||
/* End of second string */
|
||
unsigned char *end2;
|
||
/* Pointer just past last char to consider matching */
|
||
unsigned char *end_match_1, *end_match_2;
|
||
register unsigned char *d, *dend;
|
||
register int mcnt;
|
||
unsigned char *translate = (unsigned char *) pbufp->translate;
|
||
|
||
/* Failure point stack. Each place that can handle a failure further down the line
|
||
pushes a failure point on this stack. It consists of two char *'s.
|
||
The first one pushed is where to resume scanning the pattern;
|
||
the second pushed is where to resume scanning the strings.
|
||
If the latter is zero, the failure point is a "dummy".
|
||
If a failure happens and the innermost failure point is dormant,
|
||
it discards that failure point and tries the next one. */
|
||
|
||
unsigned char *initial_stack[2 * NFAILURES];
|
||
unsigned char **stackb = initial_stack;
|
||
unsigned char **stackp = stackb, **stacke = &stackb[2 * NFAILURES];
|
||
|
||
/* Information on the "contents" of registers.
|
||
These are pointers into the input strings; they record
|
||
just what was matched (on this attempt) by some part of the pattern.
|
||
The start_memory command stores the start of a register's contents
|
||
and the stop_memory command stores the end.
|
||
|
||
At that point, regstart[regnum] points to the first character in the register,
|
||
regend[regnum] points to the first character beyond the end of the register,
|
||
regstart_seg1[regnum] is true iff regstart[regnum] points into string1,
|
||
and regend_seg1[regnum] is true iff regend[regnum] points into string1. */
|
||
|
||
unsigned char *regstart[RE_NREGS];
|
||
unsigned char *regend[RE_NREGS];
|
||
unsigned char regstart_seg1[RE_NREGS], regend_seg1[RE_NREGS];
|
||
|
||
/* Set up pointers to ends of strings.
|
||
Don't allow the second string to be empty unless both are empty. */
|
||
if (!size2)
|
||
{
|
||
string2 = string1;
|
||
size2 = size1;
|
||
string1 = 0;
|
||
size1 = 0;
|
||
}
|
||
end1 = string1 + size1;
|
||
end2 = string2 + size2;
|
||
|
||
/* Compute where to stop matching, within the two strings */
|
||
if (mstop <= size1)
|
||
{
|
||
end_match_1 = string1 + mstop;
|
||
end_match_2 = string2;
|
||
}
|
||
else
|
||
{
|
||
end_match_1 = end1;
|
||
end_match_2 = string2 + mstop - size1;
|
||
}
|
||
|
||
/* Initialize \) text positions to -1
|
||
to mark ones that no \( or \) has been seen for. */
|
||
|
||
for (mcnt = 0; mcnt < sizeof (regend) / sizeof (*regend); mcnt++)
|
||
regend[mcnt] = (unsigned char *) -1;
|
||
|
||
/* `p' scans through the pattern as `d' scans through the data.
|
||
`dend' is the end of the input string that `d' points within.
|
||
`d' is advanced into the following input string whenever necessary,
|
||
but this happens before fetching;
|
||
therefore, at the beginning of the loop,
|
||
`d' can be pointing at the end of a string,
|
||
but it cannot equal string2. */
|
||
|
||
if (pos <= size1)
|
||
d = string1 + pos, dend = end_match_1;
|
||
else
|
||
d = string2 + pos - size1, dend = end_match_2;
|
||
|
||
/* Write PREFETCH; just before fetching a character with *d. */
|
||
#define PREFETCH \
|
||
while (d == dend) \
|
||
{ if (dend == end_match_2) goto fail; /* end of string2 => failure */ \
|
||
d = string2; /* end of string1 => advance to string2. */ \
|
||
dend = end_match_2; }
|
||
|
||
/* This loop loops over pattern commands.
|
||
It exits by returning from the function if match is complete,
|
||
or it drops through if match fails at this starting point in the input data. */
|
||
|
||
while (1)
|
||
{
|
||
if (p == pend)
|
||
/* End of pattern means we have succeeded! */
|
||
{
|
||
/* If caller wants register contents data back, convert it to indices */
|
||
if (regs)
|
||
{
|
||
regs->start[0] = pos;
|
||
if (dend == end_match_1)
|
||
regs->end[0] = d - string1;
|
||
else
|
||
regs->end[0] = d - string2 + size1;
|
||
for (mcnt = 1; mcnt < RE_NREGS; mcnt++)
|
||
{
|
||
if (regend[mcnt] == (unsigned char *) -1)
|
||
{
|
||
regs->start[mcnt] = -1;
|
||
regs->end[mcnt] = -1;
|
||
continue;
|
||
}
|
||
if (regstart_seg1[mcnt])
|
||
regs->start[mcnt] = regstart[mcnt] - string1;
|
||
else
|
||
regs->start[mcnt] = regstart[mcnt] - string2 + size1;
|
||
if (regend_seg1[mcnt])
|
||
regs->end[mcnt] = regend[mcnt] - string1;
|
||
else
|
||
regs->end[mcnt] = regend[mcnt] - string2 + size1;
|
||
}
|
||
}
|
||
if (dend == end_match_1)
|
||
return (d - string1 - pos);
|
||
else
|
||
return d - string2 + size1 - pos;
|
||
}
|
||
|
||
/* Otherwise match next pattern command */
|
||
#ifdef SWITCH_ENUM_BUG
|
||
switch ((int) ((enum regexpcode) *p++))
|
||
#else
|
||
switch ((enum regexpcode) *p++)
|
||
#endif
|
||
{
|
||
|
||
/* \( is represented by a start_memory, \) by a stop_memory.
|
||
Both of those commands contain a "register number" argument.
|
||
The text matched within the \( and \) is recorded under that number.
|
||
Then, \<digit> turns into a `duplicate' command which
|
||
is followed by the numeric value of <digit> as the register number. */
|
||
|
||
case start_memory:
|
||
regstart[*p] = d;
|
||
regstart_seg1[*p++] = (dend == end_match_1);
|
||
break;
|
||
|
||
case stop_memory:
|
||
regend[*p] = d;
|
||
regend_seg1[*p++] = (dend == end_match_1);
|
||
break;
|
||
|
||
case duplicate:
|
||
{
|
||
int regno = *p++; /* Get which register to match against */
|
||
register unsigned char *d2, *dend2;
|
||
|
||
d2 = regstart[regno];
|
||
dend2 = ((regstart_seg1[regno] == regend_seg1[regno])
|
||
? regend[regno] : end_match_1);
|
||
while (1)
|
||
{
|
||
/* Advance to next segment in register contents, if necessary */
|
||
while (d2 == dend2)
|
||
{
|
||
if (dend2 == end_match_2) break;
|
||
if (dend2 == regend[regno]) break;
|
||
d2 = string2, dend2 = regend[regno]; /* end of string1 => advance to string2. */
|
||
}
|
||
/* At end of register contents => success */
|
||
if (d2 == dend2) break;
|
||
|
||
/* Advance to next segment in data being matched, if necessary */
|
||
PREFETCH;
|
||
|
||
/* mcnt gets # consecutive chars to compare */
|
||
mcnt = dend - d;
|
||
if (mcnt > dend2 - d2)
|
||
mcnt = dend2 - d2;
|
||
/* Compare that many; failure if mismatch, else skip them. */
|
||
if (translate ? memcmp_translate (d, d2, mcnt, translate) : memcmp (d, d2, mcnt))
|
||
goto fail;
|
||
d += mcnt, d2 += mcnt;
|
||
}
|
||
}
|
||
break;
|
||
|
||
case anychar:
|
||
/* fetch a data character */
|
||
PREFETCH;
|
||
/* Match anything but a newline. */
|
||
if ((translate ? translate[*d++] : *d++) == '\n')
|
||
goto fail;
|
||
break;
|
||
|
||
case charset:
|
||
case charset_not:
|
||
{
|
||
/* Nonzero for charset_not */
|
||
int not = 0;
|
||
register int c;
|
||
if (*(p - 1) == (unsigned char) charset_not)
|
||
not = 1;
|
||
|
||
/* fetch a data character */
|
||
PREFETCH;
|
||
|
||
if (translate)
|
||
c = translate [*d];
|
||
else
|
||
c = *d;
|
||
|
||
if (c < *p * BYTEWIDTH
|
||
&& p[1 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH)))
|
||
not = !not;
|
||
|
||
p += 1 + *p;
|
||
|
||
if (!not) goto fail;
|
||
d++;
|
||
break;
|
||
}
|
||
|
||
case begline:
|
||
if (d == string1 || d[-1] == '\n')
|
||
break;
|
||
goto fail;
|
||
|
||
case endline:
|
||
if (d == end2
|
||
|| (d == end1 ? (size2 == 0 || *string2 == '\n') : *d == '\n'))
|
||
break;
|
||
goto fail;
|
||
|
||
/* "or" constructs ("|") are handled by starting each alternative
|
||
with an on_failure_jump that points to the start of the next alternative.
|
||
Each alternative except the last ends with a jump to the joining point.
|
||
(Actually, each jump except for the last one really jumps
|
||
to the following jump, because tensioning the jumps is a hassle.) */
|
||
|
||
/* The start of a stupid repeat has an on_failure_jump that points
|
||
past the end of the repeat text.
|
||
This makes a failure point so that, on failure to match a repetition,
|
||
matching restarts past as many repetitions have been found
|
||
with no way to fail and look for another one. */
|
||
|
||
/* A smart repeat is similar but loops back to the on_failure_jump
|
||
so that each repetition makes another failure point. */
|
||
|
||
case on_failure_jump:
|
||
if (stackp == stacke)
|
||
{
|
||
unsigned char **stackx;
|
||
if (stacke - stackb > re_max_failures * 2)
|
||
return -2;
|
||
stackx = (unsigned char **) alloca (2 * (stacke - stackb)
|
||
* sizeof (char *));
|
||
memcpy (stackx, stackb, (stacke - stackb) * sizeof (char *));
|
||
stackp = stackx + (stackp - stackb);
|
||
stacke = stackx + 2 * (stacke - stackb);
|
||
stackb = stackx;
|
||
}
|
||
mcnt = *p++ & 0377;
|
||
mcnt += SIGN_EXTEND_CHAR (*(char *)p) << 8;
|
||
p++;
|
||
*stackp++ = mcnt + p;
|
||
*stackp++ = d;
|
||
break;
|
||
|
||
/* The end of a smart repeat has an maybe_finalize_jump back.
|
||
Change it either to a finalize_jump or an ordinary jump. */
|
||
|
||
case maybe_finalize_jump:
|
||
mcnt = *p++ & 0377;
|
||
mcnt += SIGN_EXTEND_CHAR (*(char *)p) << 8;
|
||
p++;
|
||
{
|
||
register unsigned char *p2 = p;
|
||
/* Compare what follows with the begining of the repeat.
|
||
If we can establish that there is nothing that they would
|
||
both match, we can change to finalize_jump */
|
||
while (p2 != pend
|
||
&& (*p2 == (unsigned char) stop_memory
|
||
|| *p2 == (unsigned char) start_memory))
|
||
p2++;
|
||
if (p2 == pend)
|
||
p[-3] = (unsigned char) finalize_jump;
|
||
else if (*p2 == (unsigned char) exactn
|
||
|| *p2 == (unsigned char) endline)
|
||
{
|
||
register int c = *p2 == (unsigned char) endline ? '\n' : p2[2];
|
||
register unsigned char *p1 = p + mcnt;
|
||
/* p1[0] ... p1[2] are an on_failure_jump.
|
||
Examine what follows that */
|
||
if (p1[3] == (unsigned char) exactn && p1[5] != c)
|
||
p[-3] = (unsigned char) finalize_jump;
|
||
else if (p1[3] == (unsigned char) charset
|
||
|| p1[3] == (unsigned char) charset_not)
|
||
{
|
||
int not = p1[3] == (unsigned char) charset_not;
|
||
if (c < p1[4] * BYTEWIDTH
|
||
&& p1[5 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH)))
|
||
not = !not;
|
||
/* not is 1 if c would match */
|
||
/* That means it is not safe to finalize */
|
||
if (!not)
|
||
p[-3] = (unsigned char) finalize_jump;
|
||
}
|
||
}
|
||
}
|
||
p -= 2;
|
||
if (p[-1] != (unsigned char) finalize_jump)
|
||
{
|
||
p[-1] = (unsigned char) jump;
|
||
goto nofinalize;
|
||
}
|
||
|
||
/* The end of a stupid repeat has a finalize-jump
|
||
back to the start, where another failure point will be made
|
||
which will point after all the repetitions found so far. */
|
||
|
||
case finalize_jump:
|
||
stackp -= 2;
|
||
|
||
case jump:
|
||
nofinalize:
|
||
mcnt = *p++ & 0377;
|
||
mcnt += SIGN_EXTEND_CHAR (*(char *)p) << 8;
|
||
p += mcnt + 1; /* The 1 compensates for missing ++ above */
|
||
break;
|
||
|
||
case dummy_failure_jump:
|
||
if (stackp == stacke)
|
||
{
|
||
unsigned char **stackx
|
||
= (unsigned char **) alloca (2 * (stacke - stackb)
|
||
* sizeof (char *));
|
||
memcpy (stackx, stackb, (stacke - stackb) * sizeof (char *));
|
||
stackp = stackx + (stackp - stackb);
|
||
stacke = stackx + 2 * (stacke - stackb);
|
||
stackb = stackx;
|
||
}
|
||
*stackp++ = 0;
|
||
*stackp++ = 0;
|
||
goto nofinalize;
|
||
|
||
case wordbound:
|
||
if (d == string1 /* Points to first char */
|
||
|| d == end2 /* Points to end */
|
||
|| (d == end1 && size2 == 0)) /* Points to end */
|
||
break;
|
||
if ((SYNTAX (d[-1]) == Sword)
|
||
!= (SYNTAX (d == end1 ? *string2 : *d) == Sword))
|
||
break;
|
||
goto fail;
|
||
|
||
case notwordbound:
|
||
if (d == string1 /* Points to first char */
|
||
|| d == end2 /* Points to end */
|
||
|| (d == end1 && size2 == 0)) /* Points to end */
|
||
goto fail;
|
||
if ((SYNTAX (d[-1]) == Sword)
|
||
!= (SYNTAX (d == end1 ? *string2 : *d) == Sword))
|
||
goto fail;
|
||
break;
|
||
|
||
case wordbeg:
|
||
if (d == end2 /* Points to end */
|
||
|| (d == end1 && size2 == 0) /* Points to end */
|
||
|| SYNTAX (* (d == end1 ? string2 : d)) != Sword) /* Next char not a letter */
|
||
goto fail;
|
||
if (d == string1 /* Points to first char */
|
||
|| SYNTAX (d[-1]) != Sword) /* prev char not letter */
|
||
break;
|
||
goto fail;
|
||
|
||
case wordend:
|
||
if (d == string1 /* Points to first char */
|
||
|| SYNTAX (d[-1]) != Sword) /* prev char not letter */
|
||
goto fail;
|
||
if (d == end2 /* Points to end */
|
||
|| (d == end1 && size2 == 0) /* Points to end */
|
||
|| SYNTAX (d == end1 ? *string2 : *d) != Sword) /* Next char not a letter */
|
||
break;
|
||
goto fail;
|
||
|
||
#ifdef emacs
|
||
case before_dot:
|
||
if (((d - string2 <= (unsigned) size2)
|
||
? d - bf_p2 : d - bf_p1)
|
||
<= point)
|
||
goto fail;
|
||
break;
|
||
|
||
case at_dot:
|
||
if (((d - string2 <= (unsigned) size2)
|
||
? d - bf_p2 : d - bf_p1)
|
||
== point)
|
||
goto fail;
|
||
break;
|
||
|
||
case after_dot:
|
||
if (((d - string2 <= (unsigned) size2)
|
||
? d - bf_p2 : d - bf_p1)
|
||
>= point)
|
||
goto fail;
|
||
break;
|
||
|
||
case wordchar:
|
||
mcnt = (int) Sword;
|
||
goto matchsyntax;
|
||
|
||
case syntaxspec:
|
||
mcnt = *p++;
|
||
matchsyntax:
|
||
PREFETCH;
|
||
if (SYNTAX (*d++) != (enum syntaxcode) mcnt) goto fail;
|
||
break;
|
||
|
||
case notwordchar:
|
||
mcnt = (int) Sword;
|
||
goto matchnotsyntax;
|
||
|
||
case notsyntaxspec:
|
||
mcnt = *p++;
|
||
matchnotsyntax:
|
||
PREFETCH;
|
||
if (SYNTAX (*d++) == (enum syntaxcode) mcnt) goto fail;
|
||
break;
|
||
#else
|
||
case wordchar:
|
||
PREFETCH;
|
||
if (SYNTAX (*d++) == 0) goto fail;
|
||
break;
|
||
|
||
case notwordchar:
|
||
PREFETCH;
|
||
if (SYNTAX (*d++) != 0) goto fail;
|
||
break;
|
||
#endif /* not emacs */
|
||
|
||
case begbuf:
|
||
if (d == string1) /* Note, d cannot equal string2 */
|
||
break; /* unless string1 == string2. */
|
||
goto fail;
|
||
|
||
case endbuf:
|
||
if (d == end2 || (d == end1 && size2 == 0))
|
||
break;
|
||
goto fail;
|
||
|
||
case exactn:
|
||
/* Match the next few pattern characters exactly.
|
||
mcnt is how many characters to match. */
|
||
mcnt = *p++;
|
||
if (translate)
|
||
{
|
||
do
|
||
{
|
||
PREFETCH;
|
||
if (translate[*d++] != *p++) goto fail;
|
||
}
|
||
while (--mcnt);
|
||
}
|
||
else
|
||
{
|
||
do
|
||
{
|
||
PREFETCH;
|
||
if (*d++ != *p++) goto fail;
|
||
}
|
||
while (--mcnt);
|
||
}
|
||
break;
|
||
}
|
||
continue; /* Successfully matched one pattern command; keep matching */
|
||
|
||
/* Jump here if any matching operation fails. */
|
||
fail:
|
||
if (stackp != stackb)
|
||
/* A restart point is known. Restart there and pop it. */
|
||
{
|
||
if (!stackp[-2])
|
||
{ /* If innermost failure point is dormant, flush it and keep looking */
|
||
stackp -= 2;
|
||
goto fail;
|
||
}
|
||
d = *--stackp;
|
||
p = *--stackp;
|
||
if (d >= string1 && d <= end1)
|
||
dend = end_match_1;
|
||
}
|
||
else break; /* Matching at this starting point really fails! */
|
||
}
|
||
return -1; /* Failure to match */
|
||
}
|
||
|
||
static int
|
||
memcmp_translate (s1, s2, len, translate)
|
||
unsigned char *s1, *s2;
|
||
register int len;
|
||
unsigned char *translate;
|
||
{
|
||
register unsigned char *p1 = s1, *p2 = s2;
|
||
while (len)
|
||
{
|
||
if (translate [*p1++] != translate [*p2++]) return 1;
|
||
len--;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* Entry points compatible with bsd4.2 regex library */
|
||
|
||
#ifndef emacs
|
||
|
||
static struct re_pattern_buffer re_comp_buf;
|
||
|
||
char *
|
||
re_comp (s)
|
||
const char *s;
|
||
{
|
||
if (!s)
|
||
{
|
||
if (!re_comp_buf.buffer)
|
||
return "No previous regular expression";
|
||
return 0;
|
||
}
|
||
|
||
if (!re_comp_buf.buffer)
|
||
{
|
||
if (!(re_comp_buf.buffer = (char *) malloc (200)))
|
||
return "Memory exhausted";
|
||
re_comp_buf.allocated = 200;
|
||
if (!(re_comp_buf.fastmap = (char *) malloc (1 << BYTEWIDTH)))
|
||
return "Memory exhausted";
|
||
}
|
||
return re_compile_pattern (s, strlen (s), &re_comp_buf);
|
||
}
|
||
|
||
int
|
||
re_exec (s)
|
||
char *s;
|
||
{
|
||
int len = strlen (s);
|
||
return 0 <= re_search (&re_comp_buf, s, len, 0, len, 0);
|
||
}
|
||
|
||
#endif /* emacs */
|
||
|
||
#ifdef test
|
||
|
||
#include <stdio.h>
|
||
|
||
/* Indexed by a character, gives the upper case equivalent of the character */
|
||
|
||
static char upcase[0400] =
|
||
{ 000, 001, 002, 003, 004, 005, 006, 007,
|
||
010, 011, 012, 013, 014, 015, 016, 017,
|
||
020, 021, 022, 023, 024, 025, 026, 027,
|
||
030, 031, 032, 033, 034, 035, 036, 037,
|
||
040, 041, 042, 043, 044, 045, 046, 047,
|
||
050, 051, 052, 053, 054, 055, 056, 057,
|
||
060, 061, 062, 063, 064, 065, 066, 067,
|
||
070, 071, 072, 073, 074, 075, 076, 077,
|
||
0100, 0101, 0102, 0103, 0104, 0105, 0106, 0107,
|
||
0110, 0111, 0112, 0113, 0114, 0115, 0116, 0117,
|
||
0120, 0121, 0122, 0123, 0124, 0125, 0126, 0127,
|
||
0130, 0131, 0132, 0133, 0134, 0135, 0136, 0137,
|
||
0140, 0101, 0102, 0103, 0104, 0105, 0106, 0107,
|
||
0110, 0111, 0112, 0113, 0114, 0115, 0116, 0117,
|
||
0120, 0121, 0122, 0123, 0124, 0125, 0126, 0127,
|
||
0130, 0131, 0132, 0173, 0174, 0175, 0176, 0177,
|
||
0200, 0201, 0202, 0203, 0204, 0205, 0206, 0207,
|
||
0210, 0211, 0212, 0213, 0214, 0215, 0216, 0217,
|
||
0220, 0221, 0222, 0223, 0224, 0225, 0226, 0227,
|
||
0230, 0231, 0232, 0233, 0234, 0235, 0236, 0237,
|
||
0240, 0241, 0242, 0243, 0244, 0245, 0246, 0247,
|
||
0250, 0251, 0252, 0253, 0254, 0255, 0256, 0257,
|
||
0260, 0261, 0262, 0263, 0264, 0265, 0266, 0267,
|
||
0270, 0271, 0272, 0273, 0274, 0275, 0276, 0277,
|
||
0300, 0301, 0302, 0303, 0304, 0305, 0306, 0307,
|
||
0310, 0311, 0312, 0313, 0314, 0315, 0316, 0317,
|
||
0320, 0321, 0322, 0323, 0324, 0325, 0326, 0327,
|
||
0330, 0331, 0332, 0333, 0334, 0335, 0336, 0337,
|
||
0340, 0341, 0342, 0343, 0344, 0345, 0346, 0347,
|
||
0350, 0351, 0352, 0353, 0354, 0355, 0356, 0357,
|
||
0360, 0361, 0362, 0363, 0364, 0365, 0366, 0367,
|
||
0370, 0371, 0372, 0373, 0374, 0375, 0376, 0377
|
||
};
|
||
|
||
main (argc, argv)
|
||
int argc;
|
||
char **argv;
|
||
{
|
||
char pat[80];
|
||
struct re_pattern_buffer buf;
|
||
int i;
|
||
char c;
|
||
char fastmap[(1 << BYTEWIDTH)];
|
||
|
||
/* Allow a command argument to specify the style of syntax. */
|
||
if (argc > 1)
|
||
obscure_syntax = atoi (argv[1]);
|
||
|
||
buf.allocated = 40;
|
||
buf.buffer = (char *) malloc (buf.allocated);
|
||
buf.fastmap = fastmap;
|
||
buf.translate = upcase;
|
||
|
||
while (1)
|
||
{
|
||
gets (pat);
|
||
|
||
if (*pat)
|
||
{
|
||
re_compile_pattern (pat, strlen(pat), &buf);
|
||
|
||
for (i = 0; i < buf.used; i++)
|
||
printchar (buf.buffer[i]);
|
||
|
||
putchar_unfiltered ('\n');
|
||
|
||
printf_unfiltered ("%d allocated, %d used.\n", buf.allocated, buf.used);
|
||
|
||
re_compile_fastmap (&buf);
|
||
printf_unfiltered ("Allowed by fastmap: ");
|
||
for (i = 0; i < (1 << BYTEWIDTH); i++)
|
||
if (fastmap[i]) printchar (i);
|
||
putchar_unfiltered ('\n');
|
||
}
|
||
|
||
gets (pat); /* Now read the string to match against */
|
||
|
||
i = re_match (&buf, pat, strlen (pat), 0, 0);
|
||
printf_unfiltered ("Match value %d.\n", i);
|
||
}
|
||
}
|
||
|
||
#ifdef NOTDEF
|
||
print_buf (bufp)
|
||
struct re_pattern_buffer *bufp;
|
||
{
|
||
int i;
|
||
|
||
printf_unfiltered ("buf is :\n----------------\n");
|
||
for (i = 0; i < bufp->used; i++)
|
||
printchar (bufp->buffer[i]);
|
||
|
||
printf_unfiltered ("\n%d allocated, %d used.\n", bufp->allocated, bufp->used);
|
||
|
||
printf_unfiltered ("Allowed by fastmap: ");
|
||
for (i = 0; i < (1 << BYTEWIDTH); i++)
|
||
if (bufp->fastmap[i])
|
||
printchar (i);
|
||
printf_unfiltered ("\nAllowed by translate: ");
|
||
if (bufp->translate)
|
||
for (i = 0; i < (1 << BYTEWIDTH); i++)
|
||
if (bufp->translate[i])
|
||
printchar (i);
|
||
printf_unfiltered ("\nfastmap is%s accurate\n", bufp->fastmap_accurate ? "" : "n't");
|
||
printf_unfiltered ("can %s be null\n----------", bufp->can_be_null ? "" : "not");
|
||
}
|
||
#endif
|
||
|
||
printchar (c)
|
||
char c;
|
||
{
|
||
if (c < 041 || c >= 0177)
|
||
{
|
||
putchar_unfiltered ('\\');
|
||
putchar_unfiltered (((c >> 6) & 3) + '0');
|
||
putchar_unfiltered (((c >> 3) & 7) + '0');
|
||
putchar_unfiltered ((c & 7) + '0');
|
||
}
|
||
else
|
||
putchar_unfiltered (c);
|
||
}
|
||
|
||
error (string)
|
||
char *string;
|
||
{
|
||
puts_unfiltered (string);
|
||
exit (1);
|
||
}
|
||
|
||
#endif /* test */
|