Working interpreter.

LICENCE

@@ -0,0 +1,13 @@
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+                    Version 2, December 2004
+
+ Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
+
+ Everyone is permitted to copy and distribute verbatim or modified
+ copies of this license document, and changing it is allowed as long
+ as the name is changed.
+
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. You just DO WHAT THE FUCK YOU WANT TO.

Makefile

@@ -0,0 +1,26 @@
+CC=gcc
+CFLAGS=-std=c99 -Wall -O2 -static
+CLIBS=-lm
+PRGNAME=bfckr
+CFILES=$(shell find . -name '*.c')
+HFILES=$(shell find . -name '*.h')
+STYLE=astyle --style=1tbs
+RUN=valgrind --leak-check=full
+DEBUG=gdb --args
+ARGS="++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>."
+
+
+all: build run
+
+clean:
+	$(STYLE) $(CFILES)
+	rm -f *.o
+	rm -f $(PRGNAME)
+build:
+	$(CC) $(CFLAGS) $(CLIBS) -o $(PRGNAME) -Isrc $(CFILES)
+run:
+	./$(PRGNAME) $(ARGS)
+memtest:
+	$(RUN) ./$(PRGNAME) $(ARGS)
+debug:
+	$(DEBUG) ./$(PRGNAME)

README.md

@@ -1,2 +1,14 @@
 # bfckr
 A little brainfuck interpreter written in C.
+
+# How to run
+* Type "make"
+* Read [this](https://en.wikipedia.org/wiki/Brainf**k)
+* Create your own brainfuck software
+* ./bfckr "$yourstuff"
+
+# Licence
+Copyright © 2016 Aaron aaron@duckpond.ch
+This work is free. You can redistribute it and/or modify it under the
+terms of the Do What The Fuck You Want To Public License, Version 2,
+as published by Sam Hocevar. See the COPYING file for more details.

bfckr.c

@@ -0,0 +1,112 @@
+/* This program is free software. It comes without any warranty, to
+ * the extent permitted by applicable law. You can redistribute it
+ * and/or modify it under the terms of the Do What The Fuck You Want
+ * To Public License, Version 2, as published by Sam Hocevar. See
+ * http://www.wtfpl.net/ for more details. 
+ */
+
+#include<stdio.h>
+#include<stdint.h>
+#include<stdlib.h>
+#include<errno.h>
+#include<assert.h>
+#include<ctype.h>
+
+// Amount of memory on the band tape
+#define MEMORY_SIZE 10000
+
+// Memory initialized with zeros and its pointer
+uint8_t memory[MEMORY_SIZE] = {0};
+uint8_t *p = memory;
+
+// Prototypes
+void bfuck_parser(char *input);
+
+// Error handler
+void die(const char *message)
+{
+    if(errno) {
+        perror(message);
+    } else {
+        printf("[:-(] Error: %s\n", message);
+    }
+
+    exit(EXIT_FAILURE);
+}
+
+// Parses and executes a brainfuck expression
+void bfuck_parser(char *input)
+{
+    //printf("%s\n", input);
+
+    char curr;
+    uint16_t loop;
+
+    for(uint16_t i = 0; input[i] != 0; i++) {
+        curr = input[i];
+
+        switch(curr) {
+        case '>':
+            ++p;
+            break;
+
+        case '<':
+            --p;
+            break;
+
+        case '+':
+            ++*p;
+            break;
+
+        case '-':
+            --*p;
+            break;
+
+        case '.':
+            putchar(*p);
+            break;
+
+        case ',':
+            *p = getchar();
+            break;
+
+        case '[':
+            continue;
+            break;
+
+        case ']':
+            if(*p) {
+                loop = 1;
+                while(loop) {
+                    curr = input[--i];
+                    if(curr == '[') {
+                        loop--;
+                    }
+                    if(curr == ']') {
+                        loop++;
+                    }
+                }
+            }
+            break;
+
+        case ' ':
+            break;
+
+        default:
+            printf("%c", *p);
+            die("Invalid operant!");
+            break;
+        }
+    }
+}
+
+int main(int argc, char* argv[])
+{
+    if(argc < 2) {
+        die("Need more arguments.");
+    }
+
+    bfuck_parser(argv[1]);
+
+    exit(EXIT_SUCCESS);
+}