C - Process exited with error code 3221225477 - c

Question

I'm doing a shift-reduce algorithm for our compiler design subject. This is the code.
void shiftReduce(char str[MAX_CHAR], int prodNum, int line)
{
int limit = 5, y=0;
int substrFlag = 1; //0 true 1 false
int ctr,x, counter;
int match, next;
char stack[MAX_CHAR];
clearString(stack);
OUTER:while ((strcmp(stack, prod[0].left) != 0) && (y < limit))
{
addChar(stack, str[0]);
strcpy(str, dequeue(str));
printf("Stack = %s\nQueue = %s\n", stack, str);
for (ctr = 0; ctr < prodNum; ctr++)
{
if (strstr(stack, prod[ctr].right) != NULL)
{ //substring found
substrFlag = 0;
strcpy(stack, replace(stack, prod[ctr].right, prod[ctr].left));
goto OUTER;
}
}
if ((str[0] == '\n') || (str[0] == '\0'))
y++;
}
if (strcmp(stack, prod[0].left) == 0)
;//printf("%s - Accepted.\n", stack);
else
printf("Syntax error on line %i\n", line);
}
When I comment the printf("Stack = %s\nQueue = %s\n", stack, str); line, it works well. But when I uncomment it, it returns the code 3221225477.
BTW. This is the dequeue function:
char * dequeue (char str[MAX_CHAR])
{
int x = 0; char temp;
for (x = 0; x < length(str); x++)
{
if ((x+1) < length(str))
str[x] = str[x+1];
}
return str;
}
and the addChar function:
void addChar (char * str, char letter)
{
int a = 0;
while (str[a] != '\0')
a++;
str[a] = letter;
str[a+1] = '\0';
return;
}
and finally replace function.
char * replace (char orig[MAX_CHAR], char substr[MAX_CHAR], char rep[MAX_CHAR])
{
int match, end=0, next=0;
int flag = 0; //0 true 1 false
char temp [MAX_CHAR];
char store[MAX_CHAR];
if (strstr(orig, substr) == NULL)
return NULL;
int x,y;
for (x = 0; x < length(orig); x++)
{
if (orig[x] == substr[0]) //if current character is equal to first character of substring
{
match = x;
for (y = 0; y < length(substr); y++)
{
if (orig[match+y] != substr[y])
{
flag = 1;
break;
}
}
if (flag == 0)
{
next = match + length(substr);
for (y = 0; y < length(rep); y++)
{
temp[match+y] = rep[y];
end = (match+y);
}
for (y = next; y < length(orig); y++)
{
temp[y] = orig[next+(y-next)];
}
return temp;
}
}
else
{
addChar(temp, orig[x]);
}
}
return temp;
}
PS. The prod array:
struct RULES
{
char left[MAX_CHAR];
char right[MAX_CHAR];
} RULES;
struct RULES prod[MAX_RULES];

Answer 1

When I comment the printf("Stack = %s\nQueue = %s\n", stack, str); line, it works well. But when I uncomment it, it returns the code 3221225477.
Then most likely either stack or str has not been 0-terminated or points to invalid memory.