ShellPkg: Add support for UEFI Shell 2.1 spec command line comments

Example:
Shell> echo "You are ^#1!" # Testing echo
You are #1!

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chris Phillips <chrisp@hp.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15871 6f19259b-4bc3-4df7-8a09-765794883524

diff --git a/ShellPkg/Application/Shell/Shell.c b/ShellPkg/Application/Shell/Shell.c
index 2f1e3eb65c89ecdce0a16f4cddd9f17109f8ea78..1d3064531dc4559cce9d4ab7f131e702b3bae8fd 100644 (file)
--- a/ShellPkg/Application/Shell/Shell.c
+++ b/ShellPkg/Application/Shell/Shell.c
@@ -2457,6 +2457,24 @@ RunCommand(
 \r
   TrimSpaces(&CleanOriginal);\r
 \r
+  //\r
+  // NULL out comments (leveraged from RunScriptFileHandle() ).\r
+  // The # character on a line is used to denote that all characters on the same line\r
+  // and to the right of the # are to be ignored by the shell.\r
+  // Afterward, again remove spaces, in case any were between the last command-parameter and '#'.\r
+  //\r
+  for (TempWalker = CleanOriginal; TempWalker != NULL && *TempWalker != CHAR_NULL; TempWalker++) {\r
+    if (*TempWalker == L'^') {\r
+      if (*(TempWalker + 1) == L'#') {\r
+        CopyMem (TempWalker, TempWalker + 1, StrSize (TempWalker) - sizeof (TempWalker[0]));\r
+      }\r
+    } else if (*TempWalker == L'#') {\r
+      *TempWalker = CHAR_NULL;\r
+    }\r
+  }\r
+\r
+  TrimSpaces(&CleanOriginal);\r
+\r
   //\r
   // Handle case that passed in command line is just 1 or more " " characters.\r
   //\r