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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