/* Keeping a unique copy of strings.
- Copyright (C) 2002 Free Software Foundation, Inc.
+
+ Copyright (C) 2002-2003, 2008-2015 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
- Bison is free software; you can redistribute it and/or modify
+ 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 2, or (at your option)
- any later version.
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- Bison is distributed in the hope that it will be useful,
+ 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 Bison; see the file COPYING. If not, write to
- the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://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 S. */
-uniqstr uniqstr_new (char const *s);
+/* 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, ...)
+ _GL_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. */
+int uniqstr_cmp (uniqstr u1, uniqstr u2);
-/* Two uniqstr have the same value iff they are the same. */
-#define UNIQSTR_EQ(S1, S2) ((S1) == (S2))
+/* Die if STR is not a uniqstr. */
+void uniqstr_assert (char const *str);
-/*--------------------------------------.
-| Initializing, destroying, debugging. |
-`--------------------------------------*/
+/*----------------.
+| 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
+
+/*--------------------.
+| Table of uniqstrs. |
+`--------------------*/
/* Create the string table. */
void uniqstrs_new (void);
-/* Die if S is not a uniqstr. */
-void uniqstr_assert (char const *s);
-
/* Free all the memory allocated for symbols. */
void uniqstrs_free (void);
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