[UCRT] Import Microsoft.Windows.SDK.CRTSource version 10.0.22621.3

Imported from https://www.nuget.org/packages/Microsoft.Windows.SDK.CRTSource/10.0.22621.3
License: MIT

sdk/lib/ucrt/startup/argv_winmain.cpp

@@ -0,0 +1,111 @@
+/***
+*wincmdln.c - process command line for WinMain
+*
+*       Copyright (c) Microsoft Corporation. All rights reserved.
+*
+*Purpose:
+*       Prepare command line to be passed to [w]WinMain.
+*
+*******************************************************************************/
+
+#include <corecrt_internal.h>
+#include <mbstring.h>
+
+
+
+// In the function below, we need to ensure that we've initialized the mbc table
+// before we start performing character transformations.
+static void do_locale_initialization(unsigned char) throw() { __acrt_initialize_multibyte(); }
+static void do_locale_initialization(wchar_t)       throw() { /* no-op */                    }
+
+static unsigned char* get_command_line(unsigned char) throw()
+{
+    return reinterpret_cast<unsigned char *>(_acmdln);
+}
+
+static wchar_t* get_command_line(wchar_t) throw() { return _wcmdln; }
+
+
+// should_copy_another_character is *ONLY* checking for DBCS lead bytes to see if there
+// might be a following trail byte.  This works because the callers are only concerned
+// about escaped quote sequences and other codepages aren't using those quotes.
+static bool __cdecl should_copy_another_character(unsigned char const c) throw()
+{
+    // This is OK for UTF-8 as a quote is never a trail byte.
+    return _ismbblead(c) != 0;
+}
+
+static bool __cdecl should_copy_another_character(wchar_t) throw()
+{
+    // This is OK for UTF-16 as a quote is never part of a surrogate pair.
+    return false;
+}
+
+
+
+/***
+*_[w]wincmdln
+*
+*Purpose:
+*       Extract the command line tail to be passed to WinMain.
+*
+*       Be warned! This code was originally implemented by the NT group and
+*       has remained pretty much unchanged since 12-91. It should be changed
+*       only with extreme care since there are undoubtedly many apps which
+*       depend on its historical behavior.
+*
+*Entry:
+*       The global variable _[a|w]cmdln is set to point at the complete
+*       command line.
+*
+*Exit:
+*       Returns a pointer to the command line tail.
+*
+*Exceptions:
+*
+*******************************************************************************/
+template <typename Character>
+static Character* __cdecl common_wincmdln() throw()
+{
+    do_locale_initialization(Character());
+
+    static Character empty_string[] = { '\0' };
+
+    Character* command_line = get_command_line(Character()) == nullptr
+        ? empty_string
+        : get_command_line(Character());
+
+    // Skip past the program name (the first token in the command line) and
+    // check for and handle a quoted program name:
+    bool in_double_quotes = false;
+    while (*command_line > ' ' || (*command_line != '\0' && in_double_quotes))
+    {
+        // Toggle the in_double_quotes flag if the current character is '"'
+        if (*command_line == '"')
+            in_double_quotes = !in_double_quotes;
+
+        if (should_copy_another_character(*command_line))
+            ++command_line;
+
+        ++command_line;
+    }
+
+    // Skip past any whitespace preceding the next token:
+    while (*command_line != '\0' && *command_line <= ' ')
+        ++command_line;
+
+    return command_line;
+}
+
+
+
+extern "C" char* __cdecl _get_narrow_winmain_command_line()
+{   // Need to use unsigned char so that we correctly handle ASCII characters
+    // above 127, in particular the comparison to ' ' (space - 0x20).
+    return reinterpret_cast<char *>(common_wincmdln<unsigned char>());
+}
+
+extern "C" wchar_t* __cdecl _get_wide_winmain_command_line()
+{
+    return common_wincmdln<wchar_t>();
+}