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/** @file
Glue code that contains the EFI entry point and converts it to an EBL
ASCII Argc, Argv sytle entry point
Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>
Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "Ebl.h"
#define CMD_SEPARATOR ';'
#define MAX_ARGS 32
EFI_STATUS
EblMain (
IN UINTN Argc,
IN CHAR8 **Argv
);
///
/// EdkExternCmdEntry() & ParseArguments() convert the standard EFI entry point
/// into Argc, Argv form that calls EblMain().
///
/**
Parse the CmdLine and break it up into Argc (arg count) and Argv (array of
pointers to each argument). The Cmd buffer is altered and separators are
converted to string terminators. This allows Argv to point into CmdLine.
A CmdLine can support multiple commands. The next command in the command line
is returned if it exists.
@param CmdLine String to parse for a set of commands
@param CmdLineSize Size of CmdLine in bytes
@param Argc Returns the number of arguments in the CmdLine current command
@param Argv Argc pointers to each string in CmdLine
@return Next Command in the command line or NULL if non exists
**/
VOID
ParseArguments (
IN CHAR8 *CmdLine,
IN UINTN CmdLineSize,
OUT UINTN *Argc,
OUT CHAR8 **Argv
)
{
UINTN Arg;
CHAR8 *Char;
BOOLEAN LookingForArg;
BOOLEAN InQuote;
UINTN Index;
*Argc = 0;
if ((CmdLineSize == 0) || (AsciiStrLen (CmdLine) == 0)) {
// basic error checking failed on the arguments
return;
}
// Walk a single command line. A CMD_SEPARATOR allows multiple commands on a single line
InQuote = FALSE;
LookingForArg = TRUE;
for (Char = CmdLine, Arg = 0, Index = 0; *Char != '\0' && *Char != CMD_SEPARATOR; Char++, Index++) {
// Perform any text conversion here
if (*Char == '\t') {
// TAB to space
*Char = ' ';
}
if (LookingForArg) {
// Look for the beginning of an Argv[] entry
if (*Char == '"') {
Argv[Arg++] = ++Char;
LookingForArg = FALSE;
InQuote = TRUE;
} else if (*Char != ' ') {
Argv[Arg++] = Char;
LookingForArg = FALSE;
}
} else {
// Looking for the terminator of an Argv[] entry
if ((InQuote && (*Char == '"')) || (!InQuote && (*Char == ' '))) {
*Char = '\0';
LookingForArg = TRUE;
}
}
if ((Arg >= MAX_ARGS) || (Index > CmdLineSize)) {
// Error check buffer and exit since it does not look valid
break;
}
}
*Argc = Arg;
if (*Char == CMD_SEPARATOR) {
// Replace the command delimiter with null
*Char = '\0';
}
return;
}
/**
Embedded Boot Loader (EBL) - A simple EFI command line application for embedded
devices. PcdEmbeddedAutomaticBootCommand is a complied in command line that
gets executed automatically. The ; separator allows multiple commands
for each command line.
@param ImageHandle EFI ImageHandle for this application.
@param SystemTable EFI system table
@return EFI status of the application
**/
EFI_STATUS
EFIAPI
EdkExternCmdEntry (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_LOADED_IMAGE_PROTOCOL *ImageInfo;
UINTN Argc;
CHAR8 *Argv[MAX_ARGS];
Status = gBS->HandleProtocol (ImageHandle, &gEfiLoadedImageProtocolGuid, (VOID **)&ImageInfo);
if (EFI_ERROR (Status)) {
Argc = 0;
} else {
// Looks like valid commands were passed in.
ParseArguments (ImageInfo->LoadOptions, ImageInfo->LoadOptionsSize, &Argc, Argv);
}
return EblMain (Argc, Argv);
}
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