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/* Keeping a unique copy of strings.
Copyright (C) 2002-2003, 2008-2012 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 <http://www.gnu.org/licenses/>. */
#ifndef UNIQSTR_H_
# define UNIQSTR_H_
/*-----------------------------------------.
| Pointers to unique copies of C strings. |
`-----------------------------------------*/
typedef char const *uniqstr;
/* Return the uniqstr for STR. */
uniqstr uniqstr_new (char const *str);
/* Return a uniqstr built by vsprintf. In order to simply concatenate
strings, use UNIQSTR_CONCAT, which is a convenient wrapper around
this function. */
uniqstr uniqstr_vsprintf (char const *format, ...)
__attribute__ ((__format__ (__printf__, 1, 2)));
/* 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. */
#define UNIQSTR_CMP(USTR1, USTR2) ((USTR1) - (USTR2))
/*--------------------------------------.
| Initializing, destroying, debugging. |
`--------------------------------------*/
/* Create the string table. */
void uniqstrs_new (void);
/* Die if STR is not a uniqstr. */
void uniqstr_assert (char const *str);
/* Free all the memory allocated for symbols. */
void uniqstrs_free (void);
/* Report them all. */
void uniqstrs_print (void);
/*----------------.
| Concatenation. |
`----------------*/
/* Concatenate at most 20 strings and return a uniqstr. The goal of
this macro is to make the caller's code a little more succinct
without a trivial uniqstr_vsprintf format string to maintain
(for example, "%s%s%s") while still benefitting from gcc's type
checking. Unfortunately, because of the missing format string in the
macro invocation, the argument number reported by gcc for a bad
argument type is 1 too large. */
#define UNIQSTR_CONCAT(...) \
uniqstr_vsprintf (UNIQSTR_GEN_FORMAT (__VA_ARGS__, \
"%s", "%s", "%s", "%s", "%s", \
"%s", "%s", "%s", "%s", "%s", \
"%s", "%s", "%s", "%s", "%s", \
"%s", "%s", "%s", "%s", "%s"), \
__VA_ARGS__)
#define UNIQSTR_GEN_FORMAT(F1, F2, F3, F4, F5, \
F6, F7, F8, F9, F10, \
F11, F12, F13, F14, F15, \
F16, F17, F18, F19, F20, \
...) \
UNIQSTR_GEN_FORMAT_ (__VA_ARGS__, \
"", "", "", "", "", \
"", "", "", "", "", \
"", "", "", "", "", \
"", "", "", "", "")
#define UNIQSTR_GEN_FORMAT_(F1, F2, F3, F4, F5, \
F6, F7, F8, F9, F10, \
F11, F12, F13, F14, F15, \
F16, F17, F18, F19, F20, ...) \
F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 \
F11 F12 F13 F14 F15 F16 F17 F18 F19 F20
#endif /* ! defined UNIQSTR_H_ */
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