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/* Construct a regular expression from a literal string.
Copyright (C) 1995, 2010-2022 Free Software Foundation, Inc.
Written by Bruno Haible <haible@clisp.cons.org>, 2010.
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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */
#ifndef _REGEX_QUOTE_H
#define _REGEX_QUOTE_H
#include <stdbool.h>
#include <stdlib.h>
/* Specifies a quotation task for converting a fixed string to a regular
expression pattern. */
struct regex_quote_spec
{
/* True if the regular expression pattern consists of multibyte characters
(in the encoding given by the LC_CTYPE category of the locale),
false if it consists of single bytes or UTF-8 characters. */
unsigned int /*bool*/ multibyte : 1;
/* True if the regular expression pattern shall match only entire lines. */
unsigned int /*bool*/ anchored : 1;
/* Set of characters that need to be escaped (all ASCII), as a
NUL-terminated string. */
char special[30 + 1];
};
/* Creates a quotation task that produces a POSIX regular expression, that is,
a pattern that can be compiled with regcomp().
CFLAGS can be 0 or REG_EXTENDED.
If it is 0, the result is a Basic Regular Expression (BRE)
<https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_03>.
If it is REG_EXTENDED, the result is an Extended Regular Expression (ERE)
<https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04>.
If ANCHORED is false, the regular expression will match substrings of lines.
If ANCHORED is true, it will match only complete lines, */
extern struct regex_quote_spec
regex_quote_spec_posix (int cflags, bool anchored);
/* Creates a quotation task that produces a regular expression that can be
compiled with the GNU API function re_compile_pattern().
SYNTAX describes the syntax of the regular expression (such as
RE_SYNTAX_POSIX_BASIC, RE_SYNTAX_POSIX_EXTENDED, RE_SYNTAX_EMACS, all
defined in <regex.h>). It must be the same value as 're_syntax_options'
at the moment of the re_compile_pattern() call.
If ANCHORED is false, the regular expression will match substrings of lines.
If ANCHORED is true, it will match only complete lines, */
extern struct regex_quote_spec
regex_quote_spec_gnu (unsigned long /*reg_syntax_t*/ syntax, bool anchored);
/* Creates a quotation task that produces a PCRE regular expression, that is,
a pattern that can be compiled with pcre_compile().
OPTIONS is the same value as the second argument passed to pcre_compile().
If ANCHORED is false, the regular expression will match substrings of lines.
If ANCHORED is true, it will match only complete lines, */
extern struct regex_quote_spec
regex_quote_spec_pcre (int options, bool anchored);
/* Returns the number of bytes needed for the quoted string. */
extern size_t
regex_quote_length (const char *string, const struct regex_quote_spec *spec);
/* Copies the quoted string to p and returns the incremented p.
There must be room for regex_quote_length (string, spec) + 1 bytes at p. */
extern char *
regex_quote_copy (char *restrict p,
const char *string, const struct regex_quote_spec *spec);
/* Returns the freshly allocated quoted string. */
extern char *
regex_quote (const char *string, const struct regex_quote_spec *spec)
_GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
_GL_ATTRIBUTE_RETURNS_NONNULL;
#endif /* _REGEX_QUOTE_H */
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