/* Keeping a unique copy of strings.
- Copyright (C) 2002, 2003, 2008 Free Software Foundation, Inc.
+ Copyright (C) 2002-2003, 2008-2011 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
/* 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 strlen: negative for <, nul for =, and
- positive for >. */
+/* 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))
/*--------------------------------------.
/* 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_ */