rizin/libr/asm/arch/whitespace/wsdis.c

#include <r_types.h>
#include <r_asm.h>
#include <string.h>

#ifndef WS_API
#define WS_API
#endif

enum {
	WS_OP_UNK = 0,
	WS_OP_NOP,
	WS_OP_PREF,
	WS_OP_STACK,
	WS_OP_ARITH,
	WS_OP_HEAP,
	WS_OP_FLOW,
	WS_OP_IO
};

static int get_ws_pref_optype(const ut8 *buf, int len)
{
	if(len) {
		switch(buf[0]) {
			case ' ':
				return WS_OP_STACK;
			case '\t':
				return WS_OP_PREF;
			case 10:
				return WS_OP_FLOW;
			default:
				return WS_OP_NOP;
		}
	}
	return WS_OP_UNK;
}

static int get_ws_suf_optype(const ut8 *buf, int len)
{
	if(len) {
		switch(buf[0]) {
			case ' ':
				return WS_OP_ARITH;
			case '\t':
				return WS_OP_HEAP;
			case 10:
				return WS_OP_IO;
			default:
				return WS_OP_NOP;
		}
	}
	return WS_OP_UNK;
}

WS_API int get_ws_optype(const ut8 *buf, int len)
{
	const ut8 *ptr;
	if(get_ws_pref_optype(buf, len) == WS_OP_PREF) {
		ptr = buf+1;
		while(get_ws_suf_optype(ptr, len - ( ptr - buf )) == WS_OP_NOP)
			ptr++;
		return get_ws_suf_optype(ptr, len - ( ptr - buf));
	}
	return get_ws_pref_optype(buf, len);
}

WS_API const ut8 *get_ws_next_token(const ut8 *buf, int len)
{
	const ut8 *ret;
	ret = buf;
	while(len - (ret - buf)) {
		switch(*ret) {
			case ' ':
			case '\t':
			case 10:
				return ret;
		}
		ret++;
	}
	return NULL;
}

static st32 get_ws_val(const ut8 *buf, int len)
{
	ut8 sig;
	const ut8 *tok;
	int i, ret;
	ret = 0;
	tok = get_ws_next_token(buf, len);
	sig = (*tok == '\t');
	len = len - (tok - buf) -1;
	for(i=0; i<30; i++) {						//XXX : conceptually wrong
		tok++;
		tok = get_ws_next_token(tok, len);
		if(!tok || *tok == 10) {
			if(sig)
				return ret * (-1);
			return ret;
		}
		ret = (ret << 1);
		ret = ret + (*tok == '\t');
		len = len - (tok - buf) -1;
	}
	if(sig)
		return ret * (-1);
	return ret;
}

WS_API int test_ws_token_exist(const ut8 *buf, ut8 token, int len)
{
	const ut8 *ptr;
	ptr = get_ws_next_token(buf, len);
	while(ptr && *ptr!=token && (len > 0)) {
		len = len - (ptr - buf);
		ptr = get_ws_next_token(ptr + 1, len - 1);
	}
	if(ptr)
		return (ptr-buf);
	return -1;
}

WS_API int wsdis(RAsmOp *op, const ut8 *buf, int len)
{
	const ut8 *ptr;
	ptr = buf;
	switch(get_ws_optype(buf, len)) {
		case WS_OP_UNK:
			return op->size = 0;
		case WS_OP_NOP:
			sprintf(op->buf_asm, "nop");
			return op->size = 1;
		case WS_OP_STACK:
			ptr++;
			if(!get_ws_next_token(ptr, len -1))
				return op->size = 0;
			switch(*get_ws_next_token(ptr, len - 1)) {
				case ' ':
					if(-1 == test_ws_token_exist(get_ws_next_token(ptr, len - 1), 10, len - 1))
						return op->size = 0;
					sprintf(op->buf_asm, "push");
					sprintf(&op->buf_asm[4], " %d", get_ws_val(ptr + 1, len - 1));
					return op->size = test_ws_token_exist(ptr - 1, 10, len) + 1;
				case 10:
					ptr = get_ws_next_token(ptr, len -1) + 1;
					ptr = get_ws_next_token(ptr, len - (ptr - buf));
					if(!ptr)
						return op->size = 0;
					switch(*ptr) {
						case ' ':
							sprintf(op->buf_asm, "dup");
							break;
						case '\t':
							sprintf(op->buf_asm, "swap");
							break;
						case 10:
							sprintf(op->buf_asm, "pop");
							break;
					}
					return op->size = ptr - buf + 1;
				case '\t':
					ptr = get_ws_next_token(ptr, len -1) + 1;
					ptr = get_ws_next_token(ptr, len - (ptr - buf));
					if(!ptr)
						return op->size = 0;
					switch(*ptr) {
						case ' ':
							sprintf(op->buf_asm, "copy");
							break;
						case 10:
							sprintf(op->buf_asm, "slide");
							break;
						case '\t':
							sprintf(op->buf_asm, "illegal_stack_t");
							return op->size = ptr - buf + 1;
					}
					ptr ++;
					if(-1 == test_ws_token_exist(ptr, 10, len - (ptr - buf) -1)) {
						op->buf_asm[0] = '\0';							//XXX
						return op->size = 0;
					}
					if(strlen(op->buf_asm) < 6)
						sprintf(&op->buf_asm[strlen(op->buf_asm)], " %d", get_ws_val(ptr, len - (ptr - buf) - 1));
					return op->size = test_ws_token_exist(ptr, 10, len - (ptr - buf) -1) + ptr - buf + 1;	//+1?
			}
		case WS_OP_HEAP:
			ptr = get_ws_next_token(ptr + 1, len - 1) + 1;
			ptr = get_ws_next_token(ptr, len - (ptr - buf));
			if(!ptr)
				return op->size = 0;
			switch(*ptr) {
				case ' ':
					sprintf(op->buf_asm, "store");
					break;
				case '\t':
					sprintf(op->buf_asm, "load");
					break;
				case 10:
					sprintf(op->buf_asm, "illegal_heap");
					break;
			}
			return op->size = ptr - buf + 1;
		case WS_OP_IO:
			ptr = get_ws_next_token(ptr + 1, len - 1) + 1;
			ptr = get_ws_next_token(ptr, len - (ptr - buf));
			if(!ptr)
				return op->size = 0;
			switch(*ptr) {
				case ' ':
					ptr++;
					ptr = get_ws_next_token(ptr, len - (ptr - buf));
					if(!ptr)
						return op->size = 0;
					switch(*ptr) {
						case ' ':
							sprintf(op->buf_asm, "putc");
							return op->size = ptr - buf + 1;
						case '\t':
							sprintf(op->buf_asm, "puti");
							return op->size = ptr - buf + 1;
					}
					break;
				case '\t':
					ptr++;
					ptr = get_ws_next_token(ptr, len - (ptr - buf));
					if(!ptr)
						return op->size = 0;
					switch(*ptr) {
						case ' ':
							sprintf(op->buf_asm, "getc");
							return op->size = ptr - buf + 1;
						case '\t':
							sprintf(op->buf_asm, "geti");
							return op->size = ptr - buf + 1;
					}
			}
			sprintf(op->buf_asm, "illegal_io");
			return op->size = ptr - buf + 1;
		case WS_OP_ARITH:
			ptr = get_ws_next_token(ptr + 1, len - 1) + 1;
			ptr = get_ws_next_token(ptr, len - (ptr - buf));
			if(!ptr)
				return op->size = 0;
			switch(*ptr) {
				case ' ':
					ptr++;
					ptr = get_ws_next_token(ptr, len - (ptr - buf));
					if(!ptr)
						return op->size = 0;
					switch(*ptr) {
						case ' ':
							sprintf(op->buf_asm, "add");
							break;
						case '\t':
							sprintf(op->buf_asm, "sub");
							break;
						case 10:
							sprintf(op->buf_asm, "mul");
							break;
					}
					return op->size = ptr - buf + 1;
				case '\t':
					ptr++;
					ptr = get_ws_next_token(ptr, len - (ptr -buf));
					if(!ptr)
						return op->size = 0;
					switch(*ptr) {
						case ' ':
							sprintf(op->buf_asm, "div");
							break;
						case '\t':
							sprintf(op->buf_asm, "mod");
							break;
						case 10:
							sprintf(op->buf_asm, "illegal_ar_t");
					}
					break;
				case 10:
					sprintf(op->buf_asm, "illegal_ar");
			}
			return op->size = ptr - buf + 1;
		case WS_OP_FLOW:
			ptr = get_ws_next_token(ptr + 1, len -1);
			if(!ptr)											//evil
				return op->size = 0;
			switch(*ptr) {
				case 10:
					ptr++;
					ptr = get_ws_next_token(ptr, len - (ptr - buf));
					if(!ptr)
						return op->size = 0;
					if(*ptr == 10)
						sprintf(op->buf_asm, "exit");
					else
						sprintf(op->buf_asm, "illegal_fl_lf");
					return op->size = ptr - buf + 1;
				case '\t':
					ptr++;
					ptr = get_ws_next_token(ptr, len - (ptr - buf));
					if(!ptr)
						return op->size = 0;
					switch(*ptr) {
						case 10:
							sprintf(op->buf_asm, "ret");
							return op->size = ptr - buf + 1;
						case '\t':
							sprintf(op->buf_asm, "jn");
							break;
						case ' ':
							sprintf(op->buf_asm, "jz");
							break;
					}
					ptr++;
					if(-1 == test_ws_token_exist(ptr, 10, len - (ptr - buf))) {
						op->buf_asm[0] = '\0';
						return op->size = 0;
					}
					if(strlen(op->buf_asm) == 2)
						sprintf(&op->buf_asm[2], " %d", get_ws_val(ptr, len - (ptr- buf) -1));
					return op->size = ptr - buf + test_ws_token_exist(ptr, 10, len - (ptr - buf)) + 1;
				case ' ':
					ptr++;
					ptr = get_ws_next_token(ptr, len - (ptr - buf));
					if(!ptr)
						return op->size = 0;
					switch(*ptr) {
						case 10:
							sprintf(op->buf_asm, "jmp");
							break;
						case '\t':
							sprintf(op->buf_asm, "call");
							break;
						case ' ':
							sprintf(op->buf_asm, "mark");
							break;
					}
					ptr++;
					if(-1 == test_ws_token_exist(ptr, 10, len - (ptr - buf))) {
						op->buf_asm[0] = '\0';
						return op->size = 0;
					}
					sprintf(&op->buf_asm[strlen(op->buf_asm)], " %d", get_ws_val(ptr, len - (ptr - buf) -1));
					return op->size = ptr - buf + test_ws_token_exist(ptr, 10, len - (ptr - buf)) + 1;
			}
	}
	sprintf(op->buf_asm,"wtf");
	return op->size = 0;
}