7 files changed, 184 insertions(+), 0 deletions(-)

A .clang-format
A .gitignore
A LICENSE
A README.md
A build.sh
A demo.orca
A toy.c

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+toy<
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+MIT License
+
+Copyright (c) 2017 Hundredrabbits
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

@@ 1,79 @@
+# GYO
+
+[Gyo](https://wiki.xxiivv.com/site/gyo.html) is an imaginary computer with 16 registers, 256 addressable memory addresses. The cpu understands 16 opcodes, the assembler syntax understands `=constants` and `:labels`. Programs are loaded directly into memory to create procedural self-modifiable programs.
+
+<img src='https://wiki.xxiivv.com/media/generic/gyo.jpg' width='200'/>
+
+## Instructions
+
+```
+0x0  BRK  Break
+0x1  JMP  Jump to position in memory
+0x2  JCA  Jump to position in memory, when carryflag
+0x3  JZE  Jump to position in memory, when zeroflag
+0x4  PEK  Read status
+0x5  POK  Write status
+0x6  GET  Store in register
+0x7  PUT  Store in memory
+0x8  ADD  Add value to register, set carryflag when overflow
+0x9  SUB  Substract value from register, set carryflag when overflow
+0xA  EQU  Compare register with value, set zeroflag when equal
+0xB  LES  Compare register with value, set zeroflag when less than
+0xC  AND  Bitwise AND operator
+0xD  XOR  Bitwise XOR operator
+0xE  ROL  Bitwise rotate left
+0xF  ROR  Bitwise rotate right
+```
+
+## Addressing
+
+- `#ef` the raw value.
+- `$ef` the value at address #ef in memory.
+- `[e]` the value of the 15th register.
+- `{e}` the value at the address of the 15th register.
+
+## IO
+
+To begin IO mode, activate the traps flag with `POK #08`.
+
+```
+POK #08  ; Set traps flag ON
+GET      ; Read character from stdin
+PUT [0]  ; Write character to stdout
+POK #00  ; Set traps flag OFF 
+```
+
+## Status Register
+
+The status register is distributed as follows, it shares the same byte as the register selector. The **halt** flag is used by the BRK instruction is stops the cpu, the **zero** flag is used for conditional instructions(EQU/LES/JEQ/JNE), the **carry** flag is set when a SUB/ADD instruction carries over the 8bit range and the **traps** flag is set when the pointer should be sent to the traps location(in IO operations). 
+
+```
+T C Z H
+| | | +---- Halt
+| | +------ Zero
+| +-------- Carry
++---------- Traps
+```
+
+## Assembly Syntax
+
+```
+=rate #01           ; defines constant value
+
+:label              ; a label defines an address in the program
+	ADD rate        ; add rate to register
+	EQU #0f         ; set zeroflag if register is equal to #0f
+	JZE end         ; goto end if equal
+	JMP label       
+:end
+	BRK
+```
+
+If you need to fill the memory with specific values, you can do it as follows:
+
+```
+:hello
+	#48 #65
+	#6C #6C
+	#6F #0A
+```<
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+#!/bin/bash
+
+clang-format -i toy.c
+
+rm -f ./toy
+
+# GNU/Linux
+cc -std=c89 -DDEBUG -Wall -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined -o toy toy.c
+
+# Plan9
+# pcc toy.c -o toy
+
+./toy demo.orca

@@ 1,6 @@
+...........
+.S.........
+...........
+...........
+.E.........
+...........

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+#include <stdio.h>
+
+typedef struct Grid {
+	int width;
+	int height;
+	int length;
+	char data[256 * 256];
+} Grid;
+
+int
+error(char *name)
+{
+	printf("Error: %s\n", name);
+	return 0;
+}
+
+void
+run(FILE *f, Grid *g)
+{
+	char c;
+	g->length = 0;
+	while((c = fgetc(f)) != EOF) {
+		if(c == '\n') {
+			if(g->width == 0)
+				g->width = g->length;
+			g->height = g->length / g->width;
+		}
+		g->length++;
+	}
+	printf("grid:%d(%dx%d)\n", g->length, g->width, g->height);
+}
+
+int
+main(int argc, char *argv[])
+{
+	FILE *f;
+	Grid g;
+	if(argc < 2)
+		return error("No input.");
+	f = fopen(argv[1], "r");
+	if(f == NULL)
+		return error("Missing input.");
+	run(f, &g);
+	return 0;
+}