X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/12cf133f348392750f808bec0d188bac58bff2bd..a17187e56386747a9b4d9633c3d116c2087f2b8b:/src/uniqstr.h

diff --git a/src/uniqstr.h b/src/uniqstr.h
index 04600e94..913da39f 100644
--- a/src/uniqstr.h
+++ b/src/uniqstr.h
@@ -1,6 +1,6 @@
 /* Keeping a unique copy of strings.
 
-   Copyright (C) 2002, 2003, 2008, 2009 Free Software Foundation, Inc.
+   Copyright (C) 2002-2003, 2008-2012 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -29,6 +29,12 @@ 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))
 
@@ -52,4 +58,41 @@ 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_ */