Implement asprintf for Windows

include/hecl/Frontend.hpp

@@ -63,7 +63,9 @@ struct Token
     {
         switch (k)
         {
-        case Kind::None: return "none"sv;
+        case Kind::None:
+        default:
+            return "none"sv;
         case Kind::Eof: return "eof"sv;
         case Kind::Lf: return "lf"sv;
         case Kind::Plus: return "+"sv;
@@ -156,7 +158,7 @@ class Scanner
     int _read();
     bool read();
 
-    static char chr(char c) { return (c < 32 || c > 127) ? '.' : c; }
+    static char chr(char c) { return (c < 32) ? '.' : c; }
 
 public:
     Scanner(Diagnostics& diag) : m_diag(diag) {}
@@ -206,14 +208,17 @@ struct IRNode
         case Op::Sub: return "-"sv;
         case Op::Mul: return "*"sv;
         case Op::Div: return "/"sv;
+        default: return ""sv;
         }
     }
 
     static std::string_view KindToStr(Kind k)
     {
         switch (k)
         {
-        case Kind::None: return "none"sv;
+        case Kind::None:
+        default:
+            return "none"sv;
         case Kind::Call: return "call"sv;
         case Kind::Imm: return "imm"sv;
         case Kind::Binop: return "binop"sv;

include/hecl/winsupport.hpp

@@ -10,5 +10,6 @@
 #include "windows.h"
 
 void* memmem(const void *haystack, size_t hlen, const void *needle, size_t nlen);
+int asprintf(char** buf, const char* format, ...);
 
 #endif // _HECL_WINSUPPORT_H_

lib/winsupport.cpp

@@ -34,3 +34,16 @@ void *memmem(const void *haystack, size_t hlen, const void *needle, size_t nlen)
 
     return NULL;
 }
+
+int asprintf(char** buf, const char* format, ...)
+{
+    va_list ap;
+    va_start(ap, format);
+    int len = vsnprintf(nullptr, 0, format, ap);
+    va_end(ap);
+    *buf = (char*)malloc(len + 1);
+    va_start(ap, format);
+    vsnprintf(*buf, len + 1, format, ap);
+    va_end(ap);
+    return len;
+}