C# char wrappers fixes for enum values, static const member char values and %csconst

Use hex escaping for char values used as C# constants

Examples/test-suite/char_constant.i

@@ -24,8 +24,8 @@
 
 #if defined(SWIGJAVA)
 %javaconst(1);
-//#elif SWIGCSHARP
+#elif SWIGCSHARP
-//%csconst(1);
+%csconst(1);
 #elif SWIGD
 %dmanifestconst;
 #endif

Examples/test-suite/chartest.i

@@ -41,8 +41,8 @@ struct CharTestClass {
 
 #if defined(SWIGJAVA)
 %javaconst(1);
-//#elif SWIGCSHARP
+#elif SWIGCSHARP
-//%csconst(1);
+%csconst(1);
 #elif SWIGD
 %dmanifestconst;
 #endif

Source/Modules/csharp.cxx

@@ -1309,7 +1309,7 @@ public:
       const char *val = Equal(Getattr(n, "enumvalue"), "true") ? "1" : "0";
       Setattr(n, "enumvalue", val);
     } else if (swigtype == T_CHAR) {
-      String *val = NewStringf("'%s'", Getattr(n, "enumvalue"));
+      String *val = NewStringf("'%(hexescape)s'", Getattr(n, "enumvalue"));
       Setattr(n, "enumvalue", val);
       Delete(val);
     }
@@ -1433,6 +1433,7 @@ public:
   virtual int constantWrapper(Node *n) {
     String *symname = Getattr(n, "sym:name");
     SwigType *t = Getattr(n, "type");
+    SwigType *valuetype = Getattr(n, "valuetype");
     ParmList *l = Getattr(n, "parms");
     String *tm;
     String *return_type = NewString("");
@@ -1485,13 +1486,15 @@ public:
       Swig_warning(WARN_CSHARP_TYPEMAP_CSWTYPE_UNDEF, input_file, line_number, "No cstype typemap defined for %s\n", SwigType_str(t, 0));
     }
 
+    // Default (octal) escaping is no good - change to hex escaped value
+    String *hexescaped_value = Getattr(n, "rawvalue") ? NewStringf("%(hexescape)s", Getattr(n, "rawvalue")) : 0;
     // Add the stripped quotes back in
     String *new_value = NewString("");
     if (SwigType_type(t) == T_STRING) {
-      Printf(new_value, "\"%s\"", Copy(Getattr(n, "value")));
+      Printf(new_value, "\"%s\"", hexescaped_value ? hexescaped_value : Copy(Getattr(n, "value")));
       Setattr(n, "value", new_value);
     } else if (SwigType_type(t) == T_CHAR) {
-      Printf(new_value, "\'%s\'", Copy(Getattr(n, "value")));
+      Printf(new_value, "\'%s\'", hexescaped_value ? hexescaped_value : Copy(Getattr(n, "value")));
       Setattr(n, "value", new_value);
     }
 
@@ -1532,10 +1535,14 @@ public:
     } else {
       // Alternative constant handling will use the C syntax to make a true C# constant and hope that it compiles as C# code
       if (Getattr(n, "wrappedasconstant")) {
-	if (SwigType_type(t) == T_CHAR)
+	if (SwigType_type(t) == T_CHAR) {
-          Printf(constants_code, "\'%s\';\n", Getattr(n, "staticmembervariableHandler:value"));
+	  if (SwigType_type(valuetype) == T_CHAR)
-	else
+	    Printf(constants_code, "\'%(hexescape)s\';\n", Getattr(n, "staticmembervariableHandler:value"));
+	  else
+	    Printf(constants_code, "(char)%s;\n", Getattr(n, "staticmembervariableHandler:value"));
+	} else {
           Printf(constants_code, "%s;\n", Getattr(n, "staticmembervariableHandler:value"));
+	}
       } else {
         Printf(constants_code, "%s;\n", Getattr(n, "value"));
       }

Source/Swig/misc.c

@@ -309,6 +309,7 @@ int Swig_storage_isstatic(Node *n) {
  * Swig_string_escape()
  *
  * Takes a string object and produces a string with escape codes added to it.
+ * Octal escaping is used.
  * ----------------------------------------------------------------------------- */
 
 String *Swig_string_escape(String *s) {
@@ -342,6 +343,43 @@ String *Swig_string_escape(String *s) {
   return ns;
 }
 
+/* -----------------------------------------------------------------------------
+ * Swig_string_hexescape()
+ *
+ * Takes a string object and produces a string with escape codes added to it.
+ * Hex escaping is used.
+ * ----------------------------------------------------------------------------- */
+
+String *Swig_string_hexescape(String *s) {
+  String *ns;
+  int c;
+  ns = NewStringEmpty();
+
+  while ((c = Getc(s)) != EOF) {
+    if (c == '\n') {
+      Printf(ns, "\\n");
+    } else if (c == '\r') {
+      Printf(ns, "\\r");
+    } else if (c == '\t') {
+      Printf(ns, "\\t");
+    } else if (c == '\\') {
+      Printf(ns, "\\\\");
+    } else if (c == '\'') {
+      Printf(ns, "\\'");
+    } else if (c == '\"') {
+      Printf(ns, "\\\"");
+    } else if (c == ' ') {
+      Putc(c, ns);
+    } else if (!isgraph(c)) {
+      if (c < 0)
+	c += UCHAR_MAX + 1;
+      Printf(ns, "\\x%X", c);
+    } else {
+      Putc(c, ns);
+    }
+  }
+  return ns;
+}
 
 /* -----------------------------------------------------------------------------
  * Swig_string_upper()
@@ -1392,6 +1430,7 @@ String *Swig_pcre_version(void) {
 void Swig_init() {
   /* Set some useful string encoding methods */
   DohEncoding("escape", Swig_string_escape);
+  DohEncoding("hexescape", Swig_string_hexescape);
   DohEncoding("upper", Swig_string_upper);
   DohEncoding("lower", Swig_string_lower);
   DohEncoding("title", Swig_string_title);