part5.c

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdbool.h>

void filterDigit (char *s)
{
	char *p = s;
	for (*p; *p; ++p)
		if (isdigit(*p))
			*s++ = *p;
	*s = '\0';
}

void decToBin (char *value, char* output)
{
	int v, i;
	v = atoi(value);
	if (v > 8 | v < 0)
	{
		output[5] = '\0';
		for (i = 4; i >= 0; --i, v >>= 1)
		{
			output[i] = (v & 1) + '0';
		}
	} else {
		output[3] = '\0';
		for (i = 2; i >= 0; --i, v >>= 1)
		{
			output[i] = (v & 1) + '0';
		}
	}
}

void binToHex(const char *inStr, char *outStr) {
	static char hex[] = "0123456789abcdef";
	int len = strlen(inStr) / 4;
	int i = strlen(inStr) % 4;
	char current = 0;
	if(i)
	{
		while(i--)
		{
			current = (current << 1) + (*inStr - '0');
			inStr++;
		}
		*outStr = hex[current];
		++outStr;
	}
	while(len--)
	{
		current = 0;
		for(i = 0; i < 4; ++i)
		{
			current = (current << 1) + (*inStr - '0');
			inStr++;
		}
		*outStr = hex[current];
		++outStr;
	}
	*outStr = 0;}

bool isInt(const char *str)
{
	if (*str == '-')
		++str;
	if (!*str)
		return false;
	while (*str)
	{
		if (!isdigit(*str))
			return false;
		else
			++str;
	}

	return true;
}

int main(int argc, char *argv[]) {
	int immediateAdd = 1, pc = (int)strtol(argv[3], NULL, 16);
	if (argc != 4)
	{
		printf("Usage: %s filename\nor\nUsage: %s filename sTableName address\n", argv[0]);
	} else {
		FILE *file, *sTable;
		char opCode[4], srcDest[2], src1[2], src2[5], instCode[20], line[25], sTableSymbol[5], sTableValue[5];
		file = fopen(argv[1], "r");
		sTable = fopen(argv[2], "r");
		while (fgets(line, 25, file) != NULL)
		{
			sscanf(line, "%s %[^,],%[^,],%s", opCode, srcDest, &src1, &src2);
			pc++;

			if (strncmp(opCode, "br", 2) != 0)
			{
				filterDigit(srcDest);
				decToBin(srcDest, srcDest);
			}

			if (strcmp(opCode, "ld") != 0)
			{
				filterDigit(src1);
				decToBin(src1, src1);
			}

			if (!isInt(src2))
			{
				filterDigit(src2);
				immediateAdd = 0;
			}

			decToBin(src2, src2);
			if (strncmp(opCode, "br", 2) == 0)
			{
				while (fscanf(sTable, "%s %s", sTableSymbol, sTableValue) != EOF)
				{
					int n = 0, z = 0, p = 0, i;
					const char *nCheck = "n", *zCheck = "z", *pCheck = "p";
					char *opcCheck = opCode;
					while (*opcCheck)
					{
						if (strchr(nCheck, *opcCheck))
						{
							n = 1;
						}
						if (strchr(zCheck, *opcCheck))
						{
							z = 1;
						}
						if (strchr(pCheck, *opcCheck))
						{
							p = 1;
						}
						opcCheck++;
					}

					if (strncmp(srcDest, sTableSymbol, 1) == 0)
					{
						int offset = (int)strtol(sTableValue, NULL, 16), dif = 0;
						dif = offset - pc;
						int sta, en;
						int count = 0;
						char offsetCreate[9]= "";
						for(sta = 8; sta >= 0; sta--)
						{
							en = 1 <<  sta;
							if(en & dif)
							{
								offsetCreate[count] = '1';
							} else {
								offsetCreate[count] = '0';
							}
							count++;
						}
						offsetCreate[9] = 0;
						sprintf(instCode, "0000%d%d%d%s", n, z, p, offsetCreate);
					}
				}
				sTable = fopen(argv[2], "r");
			} else if (strcmp(opCode, "ld") == 0) {
				while (fscanf(sTable, "%s %s", sTableSymbol, sTableValue) != EOF)
				{
					if (strncmp(src1, sTableSymbol, 3) == 0)
					{
						int offset = (int)strtol(sTableValue, NULL, 16), dif = 0;
						dif = offset - pc;
						int sta, en;
						int count = 0;
						char offsetCreate[9]= "";
						for(sta = 8; sta >= 0; sta--)
						{
							en = 1 <<  sta;
							if(en & dif)
							{
								offsetCreate[count] = '1';
							} else {
								offsetCreate[count] = '0';
							}
							count++;
						}
						offsetCreate[9] = 0;
						sprintf(instCode, "0010%s%s", srcDest, offsetCreate);
					}
				}
				sTable = fopen(argv[2], "r");
			} else if (strcmp(opCode, "jmp") == 0) {
				sprintf(instCode, "1100000%s000000", srcDest);
			} else if (strcmp(opCode, "add") == 0) {
				if (immediateAdd == 0)
				{
					sprintf(instCode, "0001%s%s000%s", srcDest, src1, src2);
				} else {
					sprintf(instCode, "0001%s%s1%s", srcDest, src1, src2);
				}
			} else {
				if (immediateAdd == 0)
				{
					sprintf(instCode, "0101%s%s000%s", srcDest, src1, src2);
				} else {
					sprintf(instCode, "0101%s%s1%s", srcDest, src1, src2);
				}
			}
			immediateAdd = 1;
			binToHex(instCode, instCode);
			printf("%s\n", instCode);
		}
		fclose(file), fclose(sTable);
	}
}