all repos — xyw @ 4f43feac68ef6e669550d985923de58832d74713

A minimal virtual machine and assembler for terminals.

xyw.h

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#ifndef XYW_H
#define XYW_H

#define XYW_MODE_X 0x20
#define XYW_MODE_Y 0x40
#define XYW_MODE_W 0x80
#define XYW_TOTAL_INSTRUCTIONS 0x20
#define XYW_TOTAL_DEVICES 0x10

// clang-format off
#define XYW_PEEKW(d) (*(d) << 8 | (d)[1])
#define XYW_POKEW(d, v) { *(d) = (v) >> 8; (d)[1] = (v); }
// clang-format on

typedef unsigned char xyw_byte;
typedef unsigned short xyw_word;

typedef xyw_byte (*xyw_input)(xyw_byte *data, xyw_byte addr, xyw_byte *error);
typedef void (*xyw_output)(xyw_byte *data, xyw_byte addr, xyw_byte *error);
typedef void (*xyw_init)(xyw_byte *data);

typedef struct xyw_device
{
    xyw_byte *data;
    xyw_init init;
    xyw_input input;
    xyw_output output;
} xyw_device;

// clang-format off
#define xyw_dbg(...) do { if (xyw_debug) fprintf(stdout, __VA_ARGS__); } while(0)
// clang-format on

extern const char xyw_instructions[][4];
extern int xyw_debug;
extern xyw_device xyw_devices[XYW_TOTAL_DEVICES];

int xyw_assemble(const char *input, const char *output);
int xyw_run(const char *input);
int xyw_eval(xyw_word pc);

#endif // XYW_H