Implement common_atoi and add unit tests

src/Common.c

@@ -74,8 +74,41 @@ void common_itoa(i32 value, char *buf, i32 bufSize)
 	reverseString(buf, common_strlen(buf));
 }
 
-i32 common_atoi(char *string, i32 len)
+// TODO(doyle): Consider if we should trash ptrs in string operations in general
+i32 common_atoi(const char *string, const i32 len)
 {
+	if (len == 0) return -1;
+
 	// TODO(doyle): Implement ATOI
-	return 0;
+	i32 index = 0;
+	if (string[index] != '-' && string[index] != '+' &&
+	    (string[index] < '0' || string[index] > '9'))
+	{
+		return -1;
+	}
+
+	b32 isNegative = FALSE;
+	if (string[index] == '-' || string[index] == '+')
+	{
+		if (string[index] == '-') isNegative = TRUE;
+		index++;
+	}
+
+	i32 result = 0;
+	for (i32 i = index; i < len; i++)
+	{
+		if (string[i] >= '0' && string[i] <= '9')
+		{
+			result *= 10;
+			result += string[i] - '0';
+		}
+		else
+		{
+			break;
+		}
+	}
+
+	if (isNegative) result *= -1;
+
+	return result;
 }

src/WorldTraveller.c

@@ -402,7 +402,9 @@ INTERNAL void assetInit(GameState *state)
 		}
 	}
 
+#if 1
 	DEBUG_RECURSIVE_PRINT_XML_TREE(&root);
+#endif
 
 	node = &root;
 	while (node)
@@ -420,6 +422,12 @@ INTERNAL void assetInit(GameState *state)
 					{
 						// TODO(doyle): Fill in details properly
 						Rect rect = {0};
+
+						// TODO(doyle): Work around for now in xml reading,
+						// reading the last node closing node not being merged
+						// to the parent
+						if (!subTextureAttrib->name) continue;
+
 						if (common_strcmp(subTextureAttrib->name, "name") == 0)
 						{
 						}
@@ -762,11 +770,29 @@ INTERNAL v2 getPosRelativeToRect(Rect rect, v2 offset,
 	return result;
 }
 
+INTERNAL void unitTest()
+{
+	ASSERT(common_atoi("-2", common_strlen("-2")) == -2);
+	ASSERT(common_atoi("100", common_strlen("100")) == 100);
+	ASSERT(common_atoi("1", common_strlen("1")) == 1);
+	ASSERT(common_atoi("954 32", common_strlen("954 32")) == 954);
+
+	ASSERT(common_atoi("", 0) == -1);
+	ASSERT(common_atoi(" 32", common_strlen(" 32")) == -1);
+	ASSERT(common_atoi("+32", common_strlen("+32")) == 32);
+	ASSERT(common_atoi("+ 32", common_strlen("+ 32")) == 0);
+
+}
+
 // TODO(doyle): Remove and implement own random generator!
 #include <time.h>
 #include <stdlib.h>
 void worldTraveller_gameInit(GameState *state, v2 windowSize)
 {
+#ifdef DENGINE_DEBUG
+	unitTest();
+#endif
+
 	i32 result = audio_init(&state->audioManager);
 	if (result)
 	{

src/include/Dengine/Common.h

@@ -35,6 +35,6 @@ char *common_memset(char *const ptr, const i32 value, const i32 numBytes);
 
 // Max buffer size should be 11 for 32 bit integers
 void common_itoa(i32 value, char *buf, i32 bufSize);
-i32 common_atoi(char *string, i32 len);
+i32 common_atoi(const char *string, const i32 len);
 
 #endif