disable escape sequences for #line and #error

Test/baseResults/hlsl.pp.line4.frag.out

@@ -9,8 +9,8 @@ hlsl.pp.line4.frag
                               EntryPoint Fragment 5  "MainPs" 70 74
                               ExecutionMode 5 OriginUpperLeft
                1:             String  "hlsl.pp.line4.frag"
-              17:             String  "C:\Users\Greg\shaders\line\foo4.frag"
-              32:             String  "C:\Users\Greg\shaders\line\u1.h"
+              17:             String  "C:\\Users\\Greg\\shaders\\line\\foo4.frag"
+              32:             String  "C:\\Users\\Greg\\shaders\\line\\u1.h"
                               Source HLSL 500 1  "// OpModuleProcessed auto-map-locations
 // OpModuleProcessed auto-map-bindings
 // OpModuleProcessed entry-point MainPs

glslang/MachineIndependent/preprocessor/Pp.cpp

@@ -722,7 +722,9 @@ int TPpContext::CPPline(TPpToken* ppToken)
     const char* sourceName = nullptr; // Optional source file name.
     bool lineErr = false;
     bool fileErr = false;
+    disableEscapeSequences = true;
     token = eval(token, MIN_PRECEDENCE, false, lineRes, lineErr, ppToken);
+    disableEscapeSequences = false;
     if (! lineErr) {
         lineToken = lineRes;
         if (token == '\n')
@@ -765,7 +767,9 @@ int TPpContext::CPPline(TPpToken* ppToken)
 // Handle #error
 int TPpContext::CPPerror(TPpToken* ppToken)
 {
+    disableEscapeSequences = true;
     int token = scanToken(ppToken);
+    disableEscapeSequences = false;
     std::string message;
     TSourceLoc loc = ppToken->loc;
 

glslang/MachineIndependent/preprocessor/PpContext.cpp

@@ -87,7 +87,8 @@ namespace glslang {
 TPpContext::TPpContext(TParseContextBase& pc, const std::string& rootFileName, TShader::Includer& inclr) :
     preamble(0), strings(0), previous_token('\n'), parseContext(pc), includer(inclr), inComment(false),
     rootFileName(rootFileName),
-    currentSourceFile(rootFileName)
+    currentSourceFile(rootFileName),
+    disableEscapeSequences(false)
 {
     ifdepth = 0;
     for (elsetracker = 0; elsetracker < maxIfNesting; elsetracker++)

glslang/MachineIndependent/preprocessor/PpContext.h

@@ -695,6 +695,7 @@ protected:
     std::string currentSourceFile;
 
     std::istringstream strtodStream;
+    bool disableEscapeSequences;
 };
 
 } // end namespace glslang

glslang/MachineIndependent/preprocessor/PpScanner.cpp

@@ -1030,7 +1030,7 @@ int TPpContext::tStringInput::scan(TPpToken* ppToken)
             ch = getch();
             while (ch != '"' && ch != '\n' && ch != EndOfInput) {
                 if (len < MaxTokenLength) {
-                    if (ch == '\\') {
+                    if (ch == '\\' && !pp->disableEscapeSequences) {
                         int nextCh = getch();
                         switch (nextCh) {
                         case '\'': ch = 0x27; break;