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bpo-45720: Drop references to shlwapi #29417

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Merged
merged 1 commit into from
Nov 5, 2021
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bpo-45720: Drop references to shlwapi #29417

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Windows/2021-11-05-01-05-46.bpo-45720.47Nc5I.rst
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@@ -0,0 +1,3 @@
Internal reference to :file:`shlwapi.dll` was dropped to help improve
startup time. This DLL will no longer be loaded at the start of every Python
process.
4 changes: 2 additions & 2 deletions PC/getpathp.c
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Expand Up @@ -92,7 +92,6 @@

#include <windows.h>
#include <pathcch.h>
#include <shlwapi.h>

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
Expand Down Expand Up @@ -265,7 +264,8 @@ canonicalize(wchar_t *buffer, const wchar_t *path)
return _PyStatus_NO_MEMORY();
}

if (PathIsRelativeW(path)) {
const wchar_t *pathTail;
if (FAILED(PathCchSkipRoot(path, &pathTail)) || path == pathTail) {
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Are you not worried at all that canonicalize() will ever be called with paths that contain forward slashes? All of the PathCch* functions handle forward slash as just a name character, in which case skipping the root, combining with current directory, and getting a canonical path all misbehave badly. It wouldn't hurt to add a wcschr() call to check for forward slashes. Though another large buffer would have to be allocated on the stack in case path has to be copied to modify it.

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Nah, it's shipped already and we'd have heard about issues if they exist. Plus #29041 is going to delete this code and replace it with code that handles both anyway.

wchar_t buff[MAXPATHLEN + 1];
if (!GetCurrentDirectoryW(MAXPATHLEN, buff)) {
return _PyStatus_ERR("unable to find current working directory");
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2 changes: 1 addition & 1 deletion PCbuild/_freeze_module.vcxproj
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Expand Up @@ -92,7 +92,7 @@
</ClCompile>
<Link>
<SubSystem>Console</SubSystem>
<AdditionalDependencies>version.lib;shlwapi.lib;ws2_32.lib;pathcch.lib;bcrypt.lib;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>version.lib;ws2_32.lib;pathcch.lib;bcrypt.lib;%(AdditionalDependencies)</AdditionalDependencies>
</Link>
</ItemDefinitionGroup>
<ItemGroup>
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2 changes: 1 addition & 1 deletion PCbuild/pythoncore.vcxproj
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Expand Up @@ -106,7 +106,7 @@
<PreprocessorDefinitions Condition="$(IncludeExternals)">_Py_HAVE_ZLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
</ClCompile>
<Link>
<AdditionalDependencies>version.lib;shlwapi.lib;ws2_32.lib;pathcch.lib;bcrypt.lib;%(AdditionalDependencies)</AdditionalDependencies>
<AdditionalDependencies>version.lib;ws2_32.lib;pathcch.lib;bcrypt.lib;%(AdditionalDependencies)</AdditionalDependencies>
</Link>
</ItemDefinitionGroup>
<ItemGroup>
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