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-/* Definitions for data structures callers pass the regex library.
-   Copyright (C) 1985, 1989 Free Software Foundation, Inc.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 1, or (at your option)
-   any later version.
-
-   This program 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 General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-
-   In other words, you are welcome to use, share and improve this program.
-   You are forbidden to forbid anyone else to use, share and improve
-   what you give them.   Help stamp out software-hoarding!  */
-
-
-/* Define number of parens for which we record the beginnings and ends.
-   This affects how much space the `struct re_registers' type takes up.  */
-#ifndef RE_NREGS
-#define RE_NREGS 10
-#endif
-
-/* These bits are used in the obscure_syntax variable to choose among
-   alternative regexp syntaxes.  */
-
-/* 1 means plain parentheses serve as grouping, and backslash
-     parentheses are needed for literal searching.
-   0 means backslash-parentheses are grouping, and plain parentheses
-     are for literal searching.  */
-#define RE_NO_BK_PARENS 1
-
-/* 1 means plain | serves as the "or"-operator, and \| is a literal.
-   0 means \| serves as the "or"-operator, and | is a literal.  */
-#define RE_NO_BK_VBAR 2
-
-/* 0 means plain + or ? serves as an operator, and \+, \? are literals.
-   1 means \+, \? are operators and plain +, ? are literals.  */
-#define RE_BK_PLUS_QM 4
-
-/* 1 means | binds tighter than ^ or $.
-   0 means the contrary.  */
-#define RE_TIGHT_VBAR 8
-
-/* 1 means treat \n as an _OR operator
-   0 means treat it as a normal character */
-#define RE_NEWLINE_OR 16
-
-/* 0 means that a special characters (such as *, ^, and $) always have
-     their special meaning regardless of the surrounding context.
-   1 means that special characters may act as normal characters in some
-     contexts.  Specifically, this applies to:
-	^ - only special at the beginning, or after ( or |
-	$ - only special at the end, or before ) or |
-	*, +, ? - only special when not after the beginning, (, or | */
-#define RE_CONTEXT_INDEP_OPS 32
-
-/* Now define combinations of bits for the standard possibilities.  */
-#define RE_SYNTAX_AWK (RE_NO_BK_PARENS | RE_NO_BK_VBAR | RE_CONTEXT_INDEP_OPS)
-#define RE_SYNTAX_EGREP (RE_SYNTAX_AWK | RE_NEWLINE_OR)
-#define RE_SYNTAX_GREP (RE_BK_PLUS_QM | RE_NEWLINE_OR)
-#define RE_SYNTAX_EMACS 0
-
-/* This data structure is used to represent a compiled pattern. */
-
-struct re_pattern_buffer
-  {
-    char *buffer;	/* Space holding the compiled pattern commands. */
-    int allocated;	/* Size of space that  buffer  points to */
-    int used;		/* Length of portion of buffer actually occupied */
-    char *fastmap;	/* Pointer to fastmap, if any, or zero if none. */
-			/* re_search uses the fastmap, if there is one,
-			   to skip quickly over totally implausible characters */
-    char *translate;	/* Translate table to apply to all characters before comparing.
-			   Or zero for no translation.
-			   The translation is applied to a pattern when it is compiled
-			   and to data when it is matched. */
-    char fastmap_accurate;
-			/* Set to zero when a new pattern is stored,
-			   set to one when the fastmap is updated from it. */
-    char can_be_null;   /* Set to one by compiling fastmap
-			   if this pattern might match the null string.
-			   It does not necessarily match the null string
-			   in that case, but if this is zero, it cannot.
-			   2 as value means can match null string
-			   but at end of range or before a character
-			   listed in the fastmap.  */
-  };
-
-/* Structure to store "register" contents data in.
-
-   Pass the address of such a structure as an argument to re_match, etc.,
-   if you want this information back.
-
-   start[i] and end[i] record the string matched by \( ... \) grouping i,
-   for i from 1 to RE_NREGS - 1.
-   start[0] and end[0] record the entire string matched. */
-
-struct re_registers
-  {
-    int start[RE_NREGS];
-    int end[RE_NREGS];
-  };
-
-/* 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 whatever for its arguments.
-  Zero-bytes may appear in the compiled regular expression. */
-
-enum regexpcode
-  {
-    unused,
-    exactn,    /* followed by one byte giving n, and then by n literal bytes */
-    begline,   /* fails unless at beginning of line */
-    endline,   /* fails unless at end of line */
-    jump,	 /* followed by two bytes giving relative address to jump to */
-    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.  */
-    anychar,	 /* matches any one character */
-    charset,     /* matches any one char belonging to specified set.
-		    First following byte is # bitmap bytes.
-		    Then come bytes for a bit-map 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, /* similar but match any character that is NOT one of those specified */
-    start_memory, /* starts remembering the text that is matched
-		    and stores it in a memory register.
-		    followed by one byte containing the register number.
-		    Register numbers must be in the range 0 through NREGS. */
-    stop_memory, /* stops remembering the text that is matched
-		    and stores it in a memory register.
-		    followed by one byte containing the register number.
-		    Register numbers must be in the range 0 through NREGS. */
-    duplicate,    /* match a duplicate of something remembered.
-		    Followed by one byte containing the index of the memory register. */
-    before_dot,	 /* Succeeds if before dot */
-    at_dot,	 /* Succeeds if at dot */
-    after_dot,	 /* Succeeds if after dot */
-    begbuf,      /* Succeeds if at beginning of buffer */
-    endbuf,      /* Succeeds if at end of buffer */
-    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 */
-    syntaxspec,  /* Matches any character whose syntax is specified.
-		    followed by a byte which contains a syntax code, Sword or such like */
-    notsyntaxspec /* Matches any character whose syntax differs from the specified. */
-  };
-
-extern char *re_compile_pattern ();
-/* Is this really advertised? */
-extern void re_compile_fastmap ();
-extern int re_search (), re_search_2 ();
-extern int re_match (), re_match_2 ();
-
-/* 4.2 bsd compatibility (yuck) */
-extern char *re_comp ();
-extern int re_exec ();
-
-#ifdef SYNTAX_TABLE
-extern char *re_syntax_table;
-#endif