Bugfixes

Memory leak : now free stack
mem_sz op : bad size was given to bzero
sub op : handling underflow case and preparing signed int handling

libs/turmit.c

@@ -10,13 +10,17 @@ TURMIT_OP(mem_sz)
 	new_sz = new_sz<2?2:new_sz;
 
 	new = realloc(turmit->stack, sizeof(turmit_int) * new_sz);
-	if(!new) { return; }
+	if(!new) {
+		perror("Unable to reallocate memory for stack");
+		return; 
+	}
 	turmit->stack = new;
 	turmit->stack_sz = new_sz;
 	turmit->stack_cur %= new_sz;
 	if(old_sz < new_sz)
 	{
-		bzero(turmit->stack + old_sz, new_sz - old_sz);
+		bzero(turmit->stack + old_sz,
+			sizeof(turmit_int) * (new_sz - old_sz));
 	}
 }
 
@@ -29,7 +33,14 @@ TURMIT_OP(add)
 TURMIT_OP(sub)
 {
 	turmit_int a = SPOP(turmit), b = SPOP(turmit);
-	SPUSH(turmit, b - a);
+	if(turmit->flags & TURMIT_SIGNED)
+	{
+		fprintf(stderr, "Signed int not implemented\n");
+	}
+	else
+	{
+		SPUSH(turmit, a>b?(turmit->int_max - a) + b:b - a);
+	}
 }
 
 TURMIT_OP(bin_and)
@@ -157,9 +168,9 @@ turmit_t *turmit_init(turmit_t *turmit, ssize_t stack_sz, ssize_t int_max,
 	turmit->op_end = 0;
 	turmit->stack_sz = stack_sz;
 	turmit->stack_cur = turmit->stack_sz - 1;
-	turmit->stack = malloc(sizeof(turmit_int) * turmit->stack_sz);
 	turmit->err = 0;
 	turmit->err_str = NULL;
+	turmit->stack = malloc(sizeof(turmit_int) * turmit->stack_sz);
 
 	if(!turmit->stack)
 	{
@@ -211,6 +222,7 @@ turmit_t *turmit_copy(turmit_t *turmit)
 
 void turmit_clean(turmit_t *turmit)
 {
+	if(turmit->stack) { free(turmit->stack); }
 	if(turmit->err_str) { free(turmit->err_str); }
 	if(turmit->expr) { free(turmit->expr); }
 	if(turmit->op_expr) { free(turmit->op_expr); }

libs/turmit.h

@@ -30,6 +30,8 @@ typedef void (*turmit_op_f)(turmit_t*);
 
 #define TURMIT_LAZY		0
 #define TURMIT_AUTOCOMP		1
+#define TURMIT_UNSIGNED		0
+#define TURMIT_SIGNED		2
 
 #define TURMIT_OK		0
 #define TURMIT_ERROR		-1