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regex.h
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C/C++ Source or Header
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1990-11-28
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4KB
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103 lines
#ifdef __GNUG__
#pragma once
#endif
/* Definitions for data structures callers pass the regex library.
Copyright (C) 1985 Richard M. Stallman
This program is distributed in the hope that it will be useful,
but without any warranty. No author or distributor
accepts responsibility to anyone for the consequences of using it
or for whether it serves any particular purpose or works at all,
unless he says so in writing.
Permission is granted to anyone to distribute verbatim copies
of this program's source code as received, in any medium, provided that
the copyright notice, the nonwarraty notice above
and this permission notice are preserved,
and that the distributor grants the recipient all rights
for further redistribution as permitted by this notice,
and informs him of these rights.
Permission is granted to distribute modified versions of this
program's source code, or of portions of it, under the above
conditions, plus the conditions that all changed files carry
prominent notices stating who last changed them and that the
derived material, including anything packaged together with it and
conceptually functioning as a modification of it rather than an
application of it, is in its entirety subject to a permission
notice identical to this one.
Permission is granted to distribute this program (verbatim or
as modified) in compiled or executable form, provided verbatim
redistribution is permitted as stated above for source code, and
A. it is accompanied by the corresponding machine-readable
source code, under the above conditions, or
B. it is accompanied by a written offer, with no time limit,
to distribute the corresponding machine-readable source code,
under the above conditions, to any one, in return for reimbursement
of the cost of distribution. Verbatim redistribution of the
written offer must be permitted. Or,
C. it is distributed by someone who received only the
compiled or executable form, and is accompanied by a copy of the
written offer of source code which he received along with it.
Permission is granted to distribute this program (verbatim or as modified)
in executable form as part of a larger system provided that the source
code for this program, including any modifications used,
is also distributed or offered as stated in the preceding paragraph.
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! */
/*
* C++ - Version
*/
#ifndef RE_NREGS
#define RE_NREGS 10
#endif
typedef unsigned char byte;
/* 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 */
byte *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. */
};
/* 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];
};
char *re_compile_pattern();