started a new database-backed runtime from scratch

src/runtime/c/pgf.h

@@ -0,0 +1,50 @@
+#ifndef PGF_H_
+#define PGF_H_
+
+#ifdef __cplusplus
+#define EXTERN_C extern "C"
+#else
+#define EXTERN_C
+#endif
+
+#if defined(_MSC_VER)
+
+#if defined(COMPILING_PGF)
+#define PGF_API_DECL __declspec(dllexport) EXTERN_C
+#define PGF_API      __declspec(dllexport) EXTERN_C
+#else
+#define PGF_API_DECL __declspec(dllimport)
+#define PGF_API      ERROR_NOT_COMPILING_LIBPGF
+#endif
+#define PGF_INTERNAL_DECL
+#define PGF_INTERNAL
+
+#elif defined(__MINGW32__)
+
+#define PGF_API_DECL EXTERN_C
+#define PGF_API      EXTERN_C
+
+#define PGF_INTERNAL_DECL
+#define PGF_INTERNAL
+
+#else
+
+#define PGF_API_DECL EXTERN_C
+#define PGF_API      EXTERN_C
+
+#define PGF_INTERNAL_DECL  __attribute__ ((visibility ("hidden")))
+#define PGF_INTERNAL       __attribute__ ((visibility ("hidden")))
+
+#endif
+
+typedef struct PgfPGF PgfPGF;
+
+typedef struct {
+    const char *type;
+    const char *msg;
+} PgfExn;
+
+PGF_API_DECL
+PgfPGF *pgf_read(const char* fpath, PgfExn* err);
+
+#endif // PGF_H_