[llvm-rc] Allow specifying language with a leading 0x prefix

This option is always interpreted strictly as a hexadecimal string,
even if it has no prefix that indicates the number format, hence
the existing call to StringRef::getAsInteger(16, ...).

StringRef::getAsInteger(0, ...) consumes a leading "0x" prefix is
present, but when the radix is specified, the radix shouldn't
be included.

Both MS rc.exe and GNU windres accept the language with that
prefix.

Also allow specifying the codepage to llvm-windres with a different
radix, as GNU windres allows that (but MS rc.exe doesn't).

This fixes https://llvm.org/PR51295.

Differential Revision: https://reviews.llvm.org/D107263

Author: mstorsjo

llvm/test/tools/llvm-rc/codepage.test

@@ -4,6 +4,8 @@
 ; RUN: llvm-readobj %t.utf8.res | FileCheck %s --check-prefix=UTF8
 ; RUN: llvm-windres --no-preprocess --codepage 65001 %p/Inputs/utf8.rc %t.utf8.res
 ; RUN: llvm-readobj %t.utf8.res | FileCheck %s --check-prefix=UTF8
+; RUN: llvm-windres --no-preprocess --codepage 0xfde9 %p/Inputs/utf8.rc %t.utf8.res
+; RUN: llvm-readobj %t.utf8.res | FileCheck %s --check-prefix=UTF8
 
 ; UTF8:      Resource type (int): STRINGTABLE (ID 6)
 ; UTF8-NEXT: Resource name (int): 1

llvm/test/tools/llvm-rc/language.test

@@ -6,6 +6,8 @@
 ; RUN: llvm-readobj %t.res | FileCheck %s
 ; RUN: llvm-windres --no-preprocess --language 40A %p/Inputs/language.rc %t.res
 ; RUN: llvm-readobj %t.res | FileCheck %s
+; RUN: llvm-windres --no-preprocess -l 0x40A %p/Inputs/language.rc %t.res
+; RUN: llvm-readobj %t.res | FileCheck %s
 
 ; CHECK:      Resource name (int): 1
 ; CHECK-NEXT: Data version:

llvm/tools/llvm-rc/llvm-rc.cpp

@@ -476,13 +476,14 @@ RcOptions parseWindresOptions(ArrayRef<const char *> ArgsArr,
   Opts.Params.CodePage = CpWin1252; // Different default
   if (InputArgs.hasArg(WINDRES_codepage)) {
     if (InputArgs.getLastArgValue(WINDRES_codepage)
-            .getAsInteger(10, Opts.Params.CodePage))
+            .getAsInteger(0, Opts.Params.CodePage))
       fatalError("Invalid code page: " +
                  InputArgs.getLastArgValue(WINDRES_codepage));
   }
   if (InputArgs.hasArg(WINDRES_language)) {
-    if (InputArgs.getLastArgValue(WINDRES_language)
-            .getAsInteger(16, Opts.LangId))
+    StringRef Val = InputArgs.getLastArgValue(WINDRES_language);
+    Val.consume_front_insensitive("0x");
+    if (Val.getAsInteger(16, Opts.LangId))
       fatalError("Invalid language id: " +
                  InputArgs.getLastArgValue(WINDRES_language));
   }
@@ -565,7 +566,9 @@ RcOptions parseRcOptions(ArrayRef<const char *> ArgsArr,
   }
   Opts.AppendNull = InputArgs.hasArg(OPT_add_null);
   if (InputArgs.hasArg(OPT_lang_id)) {
-    if (InputArgs.getLastArgValue(OPT_lang_id).getAsInteger(16, Opts.LangId))
+    StringRef Val = InputArgs.getLastArgValue(OPT_lang_id);
+    Val.consume_front_insensitive("0x");
+    if (Val.getAsInteger(16, Opts.LangId))
       fatalError("Invalid language id: " +
                  InputArgs.getLastArgValue(OPT_lang_id));
   }