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Oct 3, 2025
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Move leading underscore into the link text #5799

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06faaec
Move leading underscore into the link text
Rageking8 Sep 24, 2025
9a7c645
Update metadata in 2 C runtime topics
Rageking8 Sep 24, 2025
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7 changes: 3 additions & 4 deletions docs/c-runtime-library/reference/expand-dbg.md
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---
description: "Learn more about: _expand_dbg"
title: "_expand_dbg"
ms.date: "11/04/2016"
description: "Learn more about: _expand_dbg"
ms.date: 11/04/2016
api_name: ["_expand_dbg"]
api_location: ["msvcrt.dll", "msvcr80.dll", "msvcr90.dll", "msvcr100.dll", "msvcr100_clr0400.dll", "msvcr110.dll", "msvcr110_clr0400.dll", "msvcr120.dll", "msvcr120_clr0400.dll", "ucrtbase.dll"]
api_type: ["DLLExport"]
topic_type: ["apiref"]
f1_keywords: ["expand_dbg", "_expand_dbg"]
helpviewer_keywords: ["memory blocks, changing size", "expand_dbg function", "_expand_dbg function"]
ms.assetid: dc58c91f-72a8-48c6-b643-fe130fb6c1fd
---
# `_expand_dbg`

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## Remarks

The **`_expand_dbg`** function is a debug version of the _[`expand`](expand.md) function. When [`_DEBUG`](../debug.md) isn't defined, each call to **`_expand_dbg`** is reduced to a call to `_expand`. Both `_expand` and **`_expand_dbg`** resize a memory block in the base heap, but **`_expand_dbg`** accommodates several debugging features: buffers on either side of the user portion of the block to test for leaks, a block type parameter to track specific allocation types, and *`filename`*/*`lineNumber`* information to determine the origin of allocation requests.
The **`_expand_dbg`** function is a debug version of the [`_expand`](expand.md) function. When [`_DEBUG`](../debug.md) isn't defined, each call to **`_expand_dbg`** is reduced to a call to `_expand`. Both `_expand` and **`_expand_dbg`** resize a memory block in the base heap, but **`_expand_dbg`** accommodates several debugging features: buffers on either side of the user portion of the block to test for leaks, a block type parameter to track specific allocation types, and *`filename`*/*`lineNumber`* information to determine the origin of allocation requests.

**`_expand_dbg`** resizes the specified memory block with slightly more space than the requested *`newSize`*. *`newSize`* might be greater or less than the size of the originally allocated memory block. The extra space is used by the debug heap manager to link the debug memory blocks and to provide the application with debug header information and overwrite buffers. The resize is accomplished by either expanding or contracting the original memory block. **`_expand_dbg`** doesn't move the memory block, as does the [`_realloc_dbg`](realloc-dbg.md) function.

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6 changes: 3 additions & 3 deletions docs/c-runtime-library/reference/msize-dbg.md
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---
description: "Learn more about: _msize_dbg"
title: "_msize_dbg"
ms.date: "11/04/2016"
description: "Learn more about: _msize_dbg"
ms.date: 11/04/2016
api_name: ["_msize_dbg"]
api_location: ["msvcrt.dll", "msvcr80.dll", "msvcr90.dll", "msvcr100.dll", "msvcr100_clr0400.dll", "msvcr110.dll", "msvcr110_clr0400.dll", "msvcr120.dll", "msvcr120_clr0400.dll", "ucrtbase.dll"]
api_type: ["DLLExport"]
Expand Down Expand Up @@ -36,7 +36,7 @@ On successful completion, **`_msize_dbg`** returns the size (in bytes) of the sp

## Remarks

**`_msize_dbg`** is a debug version of the _[`msize`](msize.md) function. When [`_DEBUG`](../debug.md) isn't defined, each call to **`_msize_dbg`** is reduced to a call to `_msize`. Both `_msize` and **`_msize_dbg`** calculate the size of a memory block in the base heap, but **`_msize_dbg`** adds two debugging features: It includes the buffers on either side of the user portion of the memory block in the returned size and it allows size calculations for specific block types.
**`_msize_dbg`** is a debug version of the [`_msize`](msize.md) function. When [`_DEBUG`](../debug.md) isn't defined, each call to **`_msize_dbg`** is reduced to a call to `_msize`. Both `_msize` and **`_msize_dbg`** calculate the size of a memory block in the base heap, but **`_msize_dbg`** adds two debugging features: It includes the buffers on either side of the user portion of the memory block in the returned size and it allows size calculations for specific block types.

For information about how memory blocks are allocated, initialized, and managed in the debug version of the base heap, see [CRT debug heap details](../crt-debug-heap-details.md). For information about the allocation block types and how they're used, see [Types of blocks on the debug heap](../crt-debug-heap-details.md#types-of-blocks-on-the-debug-heap). For information about the differences between standard heap functions and the debug versions, see [Debug versions of heap allocation functions](../debug-versions-of-heap-allocation-functions.md).

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