#include <stdlib.h>
#include <stdio.h>

const char * header = ""
	"#include <stdlib.h>\n"
	"#include <stdio.h>\n"
	"#include <string.h>\n"
	"int main(int argc, char ** argv) {\n"
	"	char tape[0x10000];\n"
	"	char * head = tape;\n"
	"	memset(tape, 0, sizeof(tape));\n";

const char * footer = ""
	"	return 0;\n"
	"}\n";

int main(int argc, char ** argv) {
	if(argc > 3) { fprintf(stderr, "Usage: brainfuck_compiler [ifile.bf [ofile.c]]\n"); return 1; }
	char * ifname = argc > 1 ? argv[1] : "/dev/stdin";
	char * ofname = argc > 2 ? argv[2] : "/dev/stdout";

	FILE * ifile = fopen(ifname, "r");
	FILE * ofile = fopen(ofname, "w");
	// Write the overall setup
	fputs(header, ofile);
	int c;
	while((c=fgetc(ifile)) != EOF) {
		switch(c) {
			case '>': fputs("	++head;\n", ofile); break;
			case '<': fputs("	--head;\n", ofile); break;
			case '+': fputs("	++*head;\n",ofile); break;
			case '-': fputs("	--*head;\n",ofile); break;
			case '.': fputs("	putchar(*head);\n",ofile); break;
			case ',': fputs("	*head = getchar();\n",ofile); break;
			case '[': fputs("	while(*head) {\n", ofile); break;
			case ']': fputs("	}\n", ofile); break;
		}
	}
	fputs(footer, ofile);
	return 0;
}