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/* Keeping a unique copy of strings.
Copyright (C) 2002-2003, 2008-2015, 2018-2021 Free Software
Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
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 UNIQSTR_H_
# define UNIQSTR_H_
# include <stdio.h>
/*-----------------------------------------.
| Pointers to unique copies of C strings. |
`-----------------------------------------*/
typedef char const *uniqstr;
/* Return the uniqstr for STR. */
uniqstr uniqstr_new (char const *str);
/* Two uniqstr values have the same value iff they are the same. */
# define UNIQSTR_EQ(Ustr1, Ustr2) (!!((Ustr1) == (Ustr2)))
/* Compare two uniqstr a la strcmp: negative for <, nul for =, and
positive for >. Undefined order, relies on addresses. */
int uniqstr_cmp (uniqstr u1, uniqstr u2);
/* Die if STR is not a uniqstr. */
void uniqstr_assert (char const *str);
/*----------------.
| Concatenation. |
`----------------*/
/* Concatenate strings and return a uniqstr. The goal of
this macro is to make the caller's code a little more succinct. */
# define UNIQSTR_CONCAT(...) \
uniqstr_concat (ARRAY_CARDINALITY (((char const *[]) {__VA_ARGS__})), \
__VA_ARGS__)
uniqstr uniqstr_concat (int nargs, ...);
/*--------------------.
| Table of uniqstrs. |
`--------------------*/
/* Create the string table. */
void uniqstrs_new (void);
/* Free all the memory allocated for symbols. */
void uniqstrs_free (void);
/* Report them all. */
void uniqstrs_print (void);
#endif /* ! defined UNIQSTR_H_ */
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