From ac06652ab6d23761aa668dfea52ce609eaf96594 Mon Sep 17 00:00:00 2001
From: Eric Kohl <eric.kohl@reactos.org>
Date: Sun, 21 Jun 2026 00:59:22 +0200
Subject: [PATCH] [NETSH][REACTOS] Basic implementation of PreprocessCommand

Preprocess is used by the 'reset' command in the 'interface ip' command.
---
 base/applications/network/netsh/netsh.c | 43 +++++++++++++++++++++++--
 sdk/include/reactos/netsh_undoc.h       |  2 +-
 2 files changed, 41 insertions(+), 4 deletions(-)

diff --git a/base/applications/network/netsh/netsh.c b/base/applications/network/netsh/netsh.c
index 029bb14531e..ad9cb5adad4 100644
--- a/base/applications/network/netsh/netsh.c
+++ b/base/applications/network/netsh/netsh.c
@@ -377,7 +377,7 @@ MatchTagsInCmdLine(
     _Inout_ LPWSTR *ppwcArguments,
     _In_ DWORD dwCurrentIndex,
     _In_ DWORD dwArgCount,
-    _In_ TAG_TYPE *pttTags,
+    _Inout_ TAG_TYPE *pttTags,
     _In_ DWORD dwTagCount,
     _Out_ DWORD *pdwTagType)
 {
@@ -546,13 +546,50 @@ PreprocessCommand(
     _Inout_ LPWSTR *ppwcArguments,
     _In_ DWORD dwCurrentIndex,
     _In_ DWORD dwArgCount,
-    _In_ TAG_TYPE *pttTags,
+    _Inout_ TAG_TYPE *pttTags,
     _In_ DWORD dwTagCount,
     _In_ DWORD dwMinArgs,
     _In_ DWORD dwMaxArgs,
     _Out_ DWORD *pdwTagType)
 {
-    DPRINT1("PreprocessCommand()\n");
+    DWORD i;
+    DWORD dwError = ERROR_SUCCESS;
+
+    DPRINT("PreprocessCommand()\n");
+
+    if ((ppwcArguments == NULL) || (pttTags == NULL) || (pdwTagType == NULL))
+        return ERROR_INVALID_PARAMETER;
+
+    if (((dwArgCount - dwCurrentIndex) < dwMinArgs) || ((dwArgCount - dwCurrentIndex) > dwMaxArgs))
+        return ERROR_INVALID_SYNTAX;
+
+    for (i = 0; i < dwTagCount; i++)
+    {
+        pttTags[i].bPresent = FALSE;
+    }
+
+    if ((dwArgCount - dwCurrentIndex) > 0)
+    {
+        dwError = MatchTagsInCmdLine(hModule,
+                                     ppwcArguments,
+                                     dwCurrentIndex,
+                                     dwArgCount,
+                                     pttTags,
+                                     dwTagCount,
+                                     pdwTagType);
+        if (dwError != ERROR_SUCCESS)
+        {
+            return dwError;
+        }
+    }
+
+    /* Fail, if a required tag is missing */
+    for (i = 0; i < dwTagCount; i++)
+    {
+        if ((pttTags[i].dwRequired & NS_REQ_PRESENT) && (pttTags[i].bPresent == FALSE))
+            return ERROR_INVALID_SYNTAX;
+    }
+
     return 0;
 }
 
diff --git a/sdk/include/reactos/netsh_undoc.h b/sdk/include/reactos/netsh_undoc.h
index 05b5105e822..76fd2a34e06 100644
--- a/sdk/include/reactos/netsh_undoc.h
+++ b/sdk/include/reactos/netsh_undoc.h
@@ -30,7 +30,7 @@ MatchTagsInCmdLine(
     _Inout_ LPWSTR *ppwcArguments,
     _In_ DWORD dwCurrentIndex,
     _In_ DWORD dwArgCount,
-    _In_ TAG_TYPE *pttTags,
+    _Inout_ TAG_TYPE *pttTags,
     _In_ DWORD dwTagCount,
     _Out_ DWORD *pdwTagType);