Implement functions to get stdin, stdout & stderr

src/base/queue/queue.c

@@ -30,7 +30,10 @@ GenericQueue *_queue_push_alloc(const Allocator *allocator, GenericQueue *queue,
 	GenericQueue *output = queue;
 
 	u64 capacity = wapp_array_capacity(queue->items);
-	if (queue->count >= capacity) {
+
+	// NOTE (Abdelrahman): Extracted into variable to fix MSVC error
+	b8 queue_full = queue->count >= capacity;
+	if (queue_full) {
 		u64 new_capacity = wapp_misc_utils_u64_round_up_pow2(capacity * 2);
 		u64 array_size   = _array_calc_alloc_size(new_capacity, item_size);
 		u64 alloc_size   = sizeof(GenericQueue) + array_size;
@@ -51,7 +54,27 @@ GenericQueue *_queue_push_alloc(const Allocator *allocator, GenericQueue *queue,
 		void *copy_boundary = (void *)((uptr)(queue->items) + (queue->front * item_size));
 
 		memcpy(output->items, copy_boundary, front_count * item_size);
-		if (back_count > 0) {
+
+		/**
+		 * NOTE (Abdelrahman): Since this is a ring buffer, the elements at the beginning of the array
+		 * aren't always the ones at the front of the queue. When that's the case, the memcpy above
+		 * will only copy a subset of the elements. This is why we need to copy the remaining ones.
+		 *
+		 * Example: Take a queue that looks like this with a capacity of 5 elements
+		 *
+		 *     0       1   |   2       3       4
+		 *  ---------------|-----------------------
+		 * |   *   |   *   |   *   |   *   |   *   |
+		 *  ---------------|-----------------------
+		 *                 |
+		 *            queue_front = 2
+		 *            queue_back  = 2
+		 *
+		 * In this case, the first memcpy will only copy elements 2-4. The memcpy below will be
+		 * responsible for copying elements 0-1.
+		*/
+		b8 items_left_to_copy = back_count > 0;
+		if (items_left_to_copy) {
 			void *back_copy_dst = (void *)((uptr)(output->items) + (front_count * item_size));
 			memcpy(back_copy_dst, queue->items, back_count * item_size);
 		}

src/os/file/file.h

@@ -12,9 +12,6 @@ BEGIN_C_LINKAGE
 #endif // !WAPP_PLATFORM_CPP
 
 typedef struct WFile WFile;
-wapp_extern WFile *WF_STDIN;
-wapp_extern WFile *WF_STDOUT;
-wapp_extern WFile *WF_STDERR;
 
 typedef enum {
 	WAPP_ACCESS_READ,                       // Equivalent to r
@@ -37,6 +34,9 @@ typedef enum {
 	FILE_SEEK_ORIGIN_COUNT,
 } FileSeekOrigin;
 
+wapp_extern WFile *wapp_file_stdin(void);
+wapp_extern WFile *wapp_file_stdout(void);
+wapp_extern WFile *wapp_file_stderr(void);
 WFile *wapp_file_open(const Allocator *allocator, Str8RO *filepath, FileAccessMode mode);
 i64    wapp_file_get_current_position(WFile *file);
 i64    wapp_file_seek(WFile *file, i64 offset, FileSeekOrigin origin);

src/os/file/posix/file_posix.c

@@ -49,13 +49,20 @@ wapp_intern i32 file_seek_origins[FILE_SEEK_ORIGIN_COUNT] = {
 	[WAPP_SEEK_END]     = SEEK_END,
 };
 
-wapp_intern WFile _STDIN  = { .fd = STDIN_FILENO };
-wapp_intern WFile _STDOUT = { .fd = STDOUT_FILENO };
-wapp_intern WFile _STDERR = { .fd = STDERR_FILENO };
+WFile *wapp_file_stdin(void) {
+	wapp_persist WFile _stdin  = { .fd = STDIN_FILENO };
+	return &_stdin;
+}
 
-WFile *WF_STDIN  = &_STDIN;
-WFile *WF_STDOUT = &_STDOUT;
-WFile *WF_STDERR = &_STDERR;
+WFile *wapp_file_stdout(void) {
+	wapp_persist WFile _stdout = { .fd = STDOUT_FILENO };
+	return &_stdout;
+}
+
+WFile *wapp_file_stderr(void) {
+	wapp_persist WFile _stderr = { .fd = STDERR_FILENO };
+	return &_stderr;
+}
 
 WFile *_file_open(const Allocator *allocator, Str8RO *filepath, FileAccessMode mode) {
 	wapp_persist c8 tmp[WAPP_PATH_MAX] = {0};

src/os/file/win/file_win.c

@@ -54,6 +54,24 @@ wapp_intern DWORD file_seek_origins[FILE_SEEK_ORIGIN_COUNT] = {
 	[WAPP_SEEK_END]     = FILE_END,
 };
 
+WFile *wapp_file_stdin(void) {
+	wapp_persist WFile _stdin  = { .fh = INVALID_HANDLE_VALUE };
+	_stdin.fh = GetStdHandle(STD_INPUT_HANDLE);
+	return &_stdin;
+}
+
+WFile *wapp_file_stdout(void) {
+	wapp_persist WFile _stdout = { .fh = INVALID_HANDLE_VALUE };
+	_stdout.fh = GetStdHandle(STD_OUTPUT_HANDLE);
+	return &_stdout;
+}
+
+WFile *wapp_file_stderr(void) {
+	wapp_persist WFile _stderr = { .fh = INVALID_HANDLE_VALUE };
+	_stderr.fh = GetStdHandle(STD_ERROR_HANDLE);
+	return &_stderr;
+}
+
 WFile *_file_open(const Allocator *allocator, Str8RO *filepath, FileAccessMode mode) {
 	wapp_persist c8 tmp[WAPP_PATH_MAX] = {0};
 	memset(tmp, 0, WAPP_PATH_MAX);

tests/queue/test_queue.c

@@ -47,7 +47,7 @@ TestFuncResult test_queue_push_alloc(void) {
 
 	u64 remaining = wapp_queue_capacity(&queue) - queue.count;
 	for (u64 i = 0; i < remaining; ++i) {
-		item = remaining + i;
+		item = (i32)(remaining + i);
 		wapp_queue_push(i32, &queue, &item);
 	}
 

tests/queue/test_queue.cc

@@ -45,7 +45,7 @@ TestFuncResult test_queue_push_alloc(void) {
 
 	u64 remaining = wapp_queue_capacity(&queue) - queue.count;
 	for (u64 i = 0; i < remaining; ++i) {
-		item = remaining + i;
+		item = (i32)(remaining + i);
 		wapp_queue_push(i32, &queue, &item);
 	}