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[SHELL/EXPERIMENTS]
* Create a branch for some evul shell experiments. svn path=/branches/shell-experiments/; revision=61927
This commit is contained in:
Amine Khaldi
parent
d09f611410
commit
527f2f9057
20177 changed files with 0 additions and 1312061 deletions
963
base/shell/cmd/parser.c
Normal file
963
base/shell/cmd/parser.c
Normal file
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@ -0,0 +1,963 @@
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/*
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* PARSER.C - command parsing.
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*/
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#include "precomp.h"
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#define C_OP_LOWEST C_MULTI
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#define C_OP_HIGHEST C_PIPE
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static const TCHAR OpString[][3] = { _T("&"), _T("||"), _T("&&"), _T("|") };
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static const TCHAR RedirString[][3] = { _T("<"), _T(">"), _T(">>") };
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static const TCHAR *const IfOperatorString[] =
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{
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_T("cmdextversion"),
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_T("defined"),
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_T("errorlevel"),
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_T("exist"),
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#define IF_MAX_UNARY IF_EXIST
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_T("=="),
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_T("equ"),
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_T("gtr"),
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_T("geq"),
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_T("lss"),
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_T("leq"),
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_T("neq"),
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#define IF_MAX_COMPARISON IF_NEQ
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};
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/* These three characters act like spaces to the parser in most contexts */
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#define STANDARD_SEPS _T(",;=")
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static BOOL IsSeparator(TCHAR Char)
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{
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return _istspace(Char) || (Char && _tcschr(STANDARD_SEPS, Char));
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}
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enum
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{
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TOK_END,
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TOK_NORMAL,
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TOK_OPERATOR,
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TOK_REDIRECTION,
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TOK_BEGIN_BLOCK,
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TOK_END_BLOCK
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};
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static BOOL bParseError;
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static BOOL bLineContinuations;
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static TCHAR ParseLine[CMDLINE_LENGTH];
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static TCHAR *ParsePos;
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static TCHAR CurChar;
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static TCHAR CurrentToken[CMDLINE_LENGTH];
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static int CurrentTokenType;
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static int InsideBlock;
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static TCHAR ParseChar()
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{
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TCHAR Char;
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if (bParseError)
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return CurChar = 0;
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restart:
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/*
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* Although CRs can be injected into a line via an environment
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* variable substitution, the parser ignores them - they won't
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* even separate tokens.
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*/
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do
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Char = *ParsePos++;
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while (Char == _T('\r'));
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if (!Char)
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{
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ParsePos--;
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if (bLineContinuations)
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{
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if (!ReadLine(ParseLine, TRUE))
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{
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/* ^C pressed, or line was too long */
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bParseError = TRUE;
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}
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else if (*(ParsePos = ParseLine))
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{
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goto restart;
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}
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}
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}
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return CurChar = Char;
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}
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static void ParseError()
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{
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error_syntax(CurrentTokenType != TOK_END ? CurrentToken : NULL);
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bParseError = TRUE;
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}
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/*
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* Yes, cmd has a Lexical Analyzer. Whenever the parser gives an "xxx was
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* unexpected at this time." message, it shows what the last token read was.
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*/
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static int ParseToken(TCHAR ExtraEnd, TCHAR *Separators)
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{
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TCHAR *Out = CurrentToken;
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TCHAR Char;
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int Type;
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BOOL bInQuote = FALSE;
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for (Char = CurChar; Char && Char != _T('\n'); Char = ParseChar())
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{
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bInQuote ^= (Char == _T('"'));
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if (!bInQuote)
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{
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if (Separators != NULL)
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{
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if (_istspace(Char) || _tcschr(Separators, Char))
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{
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/* Skip leading separators */
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if (Out == CurrentToken)
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continue;
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break;
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}
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}
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/* Check for numbered redirection */
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if ((Char >= _T('0') && Char <= _T('9') &&
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(ParsePos == &ParseLine[1] || IsSeparator(ParsePos[-2]))
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&& (*ParsePos == _T('<') || *ParsePos == _T('>'))))
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{
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break;
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}
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if (Char == ExtraEnd)
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break;
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if (InsideBlock && Char == _T(')'))
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break;
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if (_tcschr(_T("&|<>"), Char))
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break;
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if (Char == _T('^'))
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{
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Char = ParseChar();
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/* Eat up a \n, allowing line continuation */
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if (Char == _T('\n'))
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Char = ParseChar();
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/* Next character is a forced literal */
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}
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}
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if (Out == &CurrentToken[CMDLINE_LENGTH - 1])
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break;
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*Out++ = Char;
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}
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/* Check if we got at least one character before reaching a special one.
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* If so, return them and leave the special for the next call. */
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if (Out != CurrentToken)
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{
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Type = TOK_NORMAL;
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}
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else if (Char == _T('('))
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{
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Type = TOK_BEGIN_BLOCK;
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*Out++ = Char;
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ParseChar();
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}
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else if (Char == _T(')'))
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{
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Type = TOK_END_BLOCK;
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*Out++ = Char;
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ParseChar();
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}
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else if (Char == _T('&') || Char == _T('|'))
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{
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Type = TOK_OPERATOR;
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*Out++ = Char;
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Char = ParseChar();
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/* check for && or || */
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if (Char == Out[-1])
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{
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*Out++ = Char;
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ParseChar();
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}
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}
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else if ((Char >= _T('0') && Char <= _T('9'))
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|| (Char == _T('<') || Char == _T('>')))
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{
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Type = TOK_REDIRECTION;
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if (Char >= _T('0') && Char <= _T('9'))
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{
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*Out++ = Char;
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Char = ParseChar();
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}
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*Out++ = Char;
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Char = ParseChar();
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if (Char == Out[-1])
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{
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/* Strangely, the tokenizer allows << as well as >>... (it
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* will cause an error when trying to parse it though) */
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*Out++ = Char;
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Char = ParseChar();
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}
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if (Char == _T('&'))
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{
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*Out++ = Char;
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while (IsSeparator(Char = ParseChar()))
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;
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if (Char >= _T('0') && Char <= _T('9'))
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{
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*Out++ = Char;
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ParseChar();
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}
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}
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}
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else
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{
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Type = TOK_END;
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}
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*Out = _T('\0');
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return CurrentTokenType = Type;
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}
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static BOOL ParseRedirection(REDIRECTION **List)
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{
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TCHAR *Tok = CurrentToken;
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BYTE Number;
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REDIR_MODE RedirMode;
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REDIRECTION *Redir;
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if (*Tok >= _T('0') && *Tok <= _T('9'))
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Number = *Tok++ - _T('0');
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else
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Number = *Tok == _T('<') ? 0 : 1;
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if (*Tok++ == _T('<'))
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{
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RedirMode = REDIR_READ;
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if (*Tok == _T('<'))
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goto fail;
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}
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else
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{
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RedirMode = REDIR_WRITE;
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if (*Tok == _T('>'))
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{
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RedirMode = REDIR_APPEND;
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Tok++;
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}
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}
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if (!*Tok)
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{
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/* The file name was not part of this token, so it'll be the next one */
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if (ParseToken(0, STANDARD_SEPS) != TOK_NORMAL)
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goto fail;
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Tok = CurrentToken;
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}
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/* If a redirection for this handle number already exists, delete it */
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while ((Redir = *List))
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{
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if (Redir->Number == Number)
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{
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*List = Redir->Next;
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cmd_free(Redir);
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continue;
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}
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List = &Redir->Next;
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}
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Redir = cmd_alloc(FIELD_OFFSET(REDIRECTION, Filename[_tcslen(Tok) + 1]));
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Redir->Next = NULL;
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Redir->OldHandle = INVALID_HANDLE_VALUE;
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Redir->Number = Number;
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Redir->Mode = RedirMode;
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_tcscpy(Redir->Filename, Tok);
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*List = Redir;
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return TRUE;
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fail:
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ParseError();
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FreeRedirection(*List);
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*List = NULL;
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return FALSE;
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}
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static PARSED_COMMAND *ParseCommandOp(int OpType);
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/* Parse a parenthesized block */
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static PARSED_COMMAND *ParseBlock(REDIRECTION *RedirList)
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{
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PARSED_COMMAND *Cmd, *Sub, **NextPtr;
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Cmd = cmd_alloc(sizeof(PARSED_COMMAND));
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Cmd->Type = C_BLOCK;
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Cmd->Next = NULL;
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Cmd->Subcommands = NULL;
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Cmd->Redirections = RedirList;
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/* Read the block contents */
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NextPtr = &Cmd->Subcommands;
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InsideBlock++;
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while (1)
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{
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Sub = ParseCommandOp(C_OP_LOWEST);
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if (Sub)
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{
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*NextPtr = Sub;
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NextPtr = &Sub->Next;
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}
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else if (bParseError)
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{
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InsideBlock--;
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FreeCommand(Cmd);
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return NULL;
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}
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if (CurrentTokenType == TOK_END_BLOCK)
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break;
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/* Skip past the \n */
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ParseChar();
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}
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InsideBlock--;
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/* Process any trailing redirections */
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while (ParseToken(0, STANDARD_SEPS) == TOK_REDIRECTION)
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{
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if (!ParseRedirection(&Cmd->Redirections))
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{
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FreeCommand(Cmd);
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return NULL;
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}
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}
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return Cmd;
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}
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/* Parse an IF statement */
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static PARSED_COMMAND *ParseIf(void)
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{
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PARSED_COMMAND *Cmd = cmd_alloc(sizeof(PARSED_COMMAND));
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int Type;
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memset(Cmd, 0, sizeof(PARSED_COMMAND));
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Cmd->Type = C_IF;
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Type = CurrentTokenType;
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if (_tcsicmp(CurrentToken, _T("/I")) == 0)
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{
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Cmd->If.Flags |= IFFLAG_IGNORECASE;
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Type = ParseToken(0, STANDARD_SEPS);
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}
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if (_tcsicmp(CurrentToken, _T("not")) == 0)
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{
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Cmd->If.Flags |= IFFLAG_NEGATE;
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Type = ParseToken(0, STANDARD_SEPS);
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||||
}
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if (Type != TOK_NORMAL)
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||||
{
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FreeCommand(Cmd);
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ParseError();
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return NULL;
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}
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||||
/* Check for unary operators */
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||||
for (; Cmd->If.Operator <= IF_MAX_UNARY; Cmd->If.Operator++)
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{
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||||
if (_tcsicmp(CurrentToken, IfOperatorString[Cmd->If.Operator]) == 0)
|
||||
{
|
||||
if (ParseToken(0, STANDARD_SEPS) != TOK_NORMAL)
|
||||
{
|
||||
FreeCommand(Cmd);
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||||
ParseError();
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||||
return NULL;
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||||
}
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||||
Cmd->If.RightArg = cmd_dup(CurrentToken);
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||||
goto condition_done;
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||||
}
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||||
}
|
||||
|
||||
/* It must be a two-argument (comparison) operator. It could be ==, so
|
||||
* the equals sign can't be treated as whitespace here. */
|
||||
Cmd->If.LeftArg = cmd_dup(CurrentToken);
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||||
ParseToken(0, _T(",;"));
|
||||
|
||||
/* The right argument can come immediately after == */
|
||||
if (_tcsnicmp(CurrentToken, _T("=="), 2) == 0 && CurrentToken[2])
|
||||
{
|
||||
Cmd->If.RightArg = cmd_dup(&CurrentToken[2]);
|
||||
goto condition_done;
|
||||
}
|
||||
|
||||
for (; Cmd->If.Operator <= IF_MAX_COMPARISON; Cmd->If.Operator++)
|
||||
{
|
||||
if (_tcsicmp(CurrentToken, IfOperatorString[Cmd->If.Operator]) == 0)
|
||||
{
|
||||
if (ParseToken(0, STANDARD_SEPS) != TOK_NORMAL)
|
||||
break;
|
||||
Cmd->If.RightArg = cmd_dup(CurrentToken);
|
||||
goto condition_done;
|
||||
}
|
||||
}
|
||||
FreeCommand(Cmd);
|
||||
ParseError();
|
||||
return NULL;
|
||||
|
||||
condition_done:
|
||||
Cmd->Subcommands = ParseCommandOp(C_OP_LOWEST);
|
||||
if (Cmd->Subcommands == NULL)
|
||||
{
|
||||
FreeCommand(Cmd);
|
||||
return NULL;
|
||||
}
|
||||
if (_tcsicmp(CurrentToken, _T("else")) == 0)
|
||||
{
|
||||
Cmd->Subcommands->Next = ParseCommandOp(C_OP_LOWEST);
|
||||
if (Cmd->Subcommands->Next == NULL)
|
||||
{
|
||||
FreeCommand(Cmd);
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
||||
return Cmd;
|
||||
}
|
||||
|
||||
/*
|
||||
* Parse a FOR command.
|
||||
* Syntax is: FOR [options] %var IN (list) DO command
|
||||
*/
|
||||
static PARSED_COMMAND *ParseFor(void)
|
||||
{
|
||||
PARSED_COMMAND *Cmd = cmd_alloc(sizeof(PARSED_COMMAND));
|
||||
TCHAR List[CMDLINE_LENGTH];
|
||||
TCHAR *Pos = List;
|
||||
|
||||
memset(Cmd, 0, sizeof(PARSED_COMMAND));
|
||||
Cmd->Type = C_FOR;
|
||||
|
||||
while (1)
|
||||
{
|
||||
if (_tcsicmp(CurrentToken, _T("/D")) == 0)
|
||||
Cmd->For.Switches |= FOR_DIRS;
|
||||
else if (_tcsicmp(CurrentToken, _T("/F")) == 0)
|
||||
{
|
||||
Cmd->For.Switches |= FOR_F;
|
||||
if (!Cmd->For.Params)
|
||||
{
|
||||
ParseToken(0, STANDARD_SEPS);
|
||||
if (CurrentToken[0] == _T('/') || CurrentToken[0] == _T('%'))
|
||||
break;
|
||||
Cmd->For.Params = cmd_dup(CurrentToken);
|
||||
}
|
||||
}
|
||||
else if (_tcsicmp(CurrentToken, _T("/L")) == 0)
|
||||
Cmd->For.Switches |= FOR_LOOP;
|
||||
else if (_tcsicmp(CurrentToken, _T("/R")) == 0)
|
||||
{
|
||||
Cmd->For.Switches |= FOR_RECURSIVE;
|
||||
if (!Cmd->For.Params)
|
||||
{
|
||||
ParseToken(0, STANDARD_SEPS);
|
||||
if (CurrentToken[0] == _T('/') || CurrentToken[0] == _T('%'))
|
||||
break;
|
||||
StripQuotes(CurrentToken);
|
||||
Cmd->For.Params = cmd_dup(CurrentToken);
|
||||
}
|
||||
}
|
||||
else
|
||||
break;
|
||||
ParseToken(0, STANDARD_SEPS);
|
||||
}
|
||||
|
||||
/* Make sure there aren't two different switches specified
|
||||
* at the same time, unless they're /D and /R */
|
||||
if ((Cmd->For.Switches & (Cmd->For.Switches - 1)) != 0
|
||||
&& Cmd->For.Switches != (FOR_DIRS | FOR_RECURSIVE))
|
||||
{
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* Variable name should be % and just one other character */
|
||||
if (CurrentToken[0] != _T('%') || _tcslen(CurrentToken) != 2)
|
||||
goto error;
|
||||
Cmd->For.Variable = CurrentToken[1];
|
||||
|
||||
ParseToken(0, STANDARD_SEPS);
|
||||
if (_tcsicmp(CurrentToken, _T("in")) != 0)
|
||||
goto error;
|
||||
|
||||
if (ParseToken(_T('('), STANDARD_SEPS) != TOK_BEGIN_BLOCK)
|
||||
goto error;
|
||||
|
||||
while (1)
|
||||
{
|
||||
int Type;
|
||||
|
||||
/* Pretend we're inside a block so the tokenizer will stop on ')' */
|
||||
InsideBlock++;
|
||||
Type = ParseToken(0, STANDARD_SEPS);
|
||||
InsideBlock--;
|
||||
|
||||
if (Type == TOK_END_BLOCK)
|
||||
break;
|
||||
|
||||
if (Type != TOK_NORMAL)
|
||||
goto error;
|
||||
|
||||
if (Pos != List)
|
||||
*Pos++ = _T(' ');
|
||||
|
||||
if (Pos + _tcslen(CurrentToken) >= &List[CMDLINE_LENGTH])
|
||||
goto error;
|
||||
Pos = _stpcpy(Pos, CurrentToken);
|
||||
}
|
||||
*Pos = _T('\0');
|
||||
Cmd->For.List = cmd_dup(List);
|
||||
|
||||
ParseToken(0, STANDARD_SEPS);
|
||||
if (_tcsicmp(CurrentToken, _T("do")) != 0)
|
||||
goto error;
|
||||
|
||||
Cmd->Subcommands = ParseCommandOp(C_OP_LOWEST);
|
||||
if (Cmd->Subcommands == NULL)
|
||||
{
|
||||
FreeCommand(Cmd);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return Cmd;
|
||||
|
||||
error:
|
||||
FreeCommand(Cmd);
|
||||
ParseError();
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* Parse a REM command */
|
||||
static PARSED_COMMAND *ParseRem(void)
|
||||
{
|
||||
/* Just ignore the rest of the line */
|
||||
while (CurChar && CurChar != _T('\n'))
|
||||
ParseChar();
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static DECLSPEC_NOINLINE PARSED_COMMAND *ParseCommandPart(REDIRECTION *RedirList)
|
||||
{
|
||||
TCHAR ParsedLine[CMDLINE_LENGTH];
|
||||
PARSED_COMMAND *Cmd;
|
||||
PARSED_COMMAND *(*Func)(void);
|
||||
|
||||
TCHAR *Pos = _stpcpy(ParsedLine, CurrentToken) + 1;
|
||||
DWORD_PTR TailOffset = Pos - ParsedLine;
|
||||
|
||||
/* Check for special forms */
|
||||
if ((Func = ParseFor, _tcsicmp(ParsedLine, _T("for")) == 0) ||
|
||||
(Func = ParseIf, _tcsicmp(ParsedLine, _T("if")) == 0) ||
|
||||
(Func = ParseRem, _tcsicmp(ParsedLine, _T("rem")) == 0))
|
||||
{
|
||||
ParseToken(0, STANDARD_SEPS);
|
||||
/* Do special parsing only if it's not followed by /? */
|
||||
if (_tcscmp(CurrentToken, _T("/?")) != 0)
|
||||
{
|
||||
if (RedirList)
|
||||
{
|
||||
ParseError();
|
||||
FreeRedirection(RedirList);
|
||||
return NULL;
|
||||
}
|
||||
return Func();
|
||||
}
|
||||
Pos = _stpcpy(Pos, _T(" /?"));
|
||||
}
|
||||
|
||||
/* Now get the tail */
|
||||
while (1)
|
||||
{
|
||||
int Type = ParseToken(0, NULL);
|
||||
if (Type == TOK_NORMAL)
|
||||
{
|
||||
if (Pos + _tcslen(CurrentToken) >= &ParsedLine[CMDLINE_LENGTH])
|
||||
{
|
||||
ParseError();
|
||||
FreeRedirection(RedirList);
|
||||
return NULL;
|
||||
}
|
||||
Pos = _stpcpy(Pos, CurrentToken);
|
||||
}
|
||||
else if (Type == TOK_REDIRECTION)
|
||||
{
|
||||
if (!ParseRedirection(&RedirList))
|
||||
return NULL;
|
||||
}
|
||||
else
|
||||
{
|
||||
break;
|
||||
}
|
||||
}
|
||||
*Pos++ = _T('\0');
|
||||
|
||||
Cmd = cmd_alloc(FIELD_OFFSET(PARSED_COMMAND, Command.First[Pos - ParsedLine]));
|
||||
Cmd->Type = C_COMMAND;
|
||||
Cmd->Next = NULL;
|
||||
Cmd->Subcommands = NULL;
|
||||
Cmd->Redirections = RedirList;
|
||||
memcpy(Cmd->Command.First, ParsedLine, (Pos - ParsedLine) * sizeof(TCHAR));
|
||||
Cmd->Command.Rest = Cmd->Command.First + TailOffset;
|
||||
return Cmd;
|
||||
}
|
||||
|
||||
static PARSED_COMMAND *ParsePrimary(void)
|
||||
{
|
||||
REDIRECTION *RedirList = NULL;
|
||||
int Type;
|
||||
|
||||
while (IsSeparator(CurChar))
|
||||
{
|
||||
if (CurChar == _T('\n'))
|
||||
return NULL;
|
||||
ParseChar();
|
||||
}
|
||||
|
||||
if (!CurChar)
|
||||
return NULL;
|
||||
|
||||
if (CurChar == _T(':'))
|
||||
{
|
||||
/* "Ignore" the rest of the line.
|
||||
* (Line continuations will still be parsed, though.) */
|
||||
while (ParseToken(0, NULL) != TOK_END)
|
||||
;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (CurChar == _T('@'))
|
||||
{
|
||||
PARSED_COMMAND *Cmd;
|
||||
ParseChar();
|
||||
Cmd = cmd_alloc(sizeof(PARSED_COMMAND));
|
||||
Cmd->Type = C_QUIET;
|
||||
Cmd->Next = NULL;
|
||||
/* @ acts like a unary operator with low precedence,
|
||||
* so call the top-level parser */
|
||||
Cmd->Subcommands = ParseCommandOp(C_OP_LOWEST);
|
||||
Cmd->Redirections = NULL;
|
||||
return Cmd;
|
||||
}
|
||||
|
||||
/* Process leading redirections and get the head of the command */
|
||||
while ((Type = ParseToken(_T('('), STANDARD_SEPS)) == TOK_REDIRECTION)
|
||||
{
|
||||
if (!ParseRedirection(&RedirList))
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (Type == TOK_NORMAL)
|
||||
return ParseCommandPart(RedirList);
|
||||
else if (Type == TOK_BEGIN_BLOCK)
|
||||
return ParseBlock(RedirList);
|
||||
else if (Type == TOK_END_BLOCK && !RedirList)
|
||||
return NULL;
|
||||
|
||||
ParseError();
|
||||
FreeRedirection(RedirList);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static PARSED_COMMAND *ParseCommandOp(int OpType)
|
||||
{
|
||||
PARSED_COMMAND *Cmd, *Left, *Right;
|
||||
|
||||
if (OpType == C_OP_HIGHEST)
|
||||
Cmd = ParsePrimary();
|
||||
else
|
||||
Cmd = ParseCommandOp(OpType + 1);
|
||||
|
||||
if (Cmd && !_tcscmp(CurrentToken, OpString[OpType - C_OP_LOWEST]))
|
||||
{
|
||||
Left = Cmd;
|
||||
Right = ParseCommandOp(OpType);
|
||||
if (!Right)
|
||||
{
|
||||
if (!bParseError)
|
||||
{
|
||||
/* & is allowed to have an empty RHS */
|
||||
if (OpType == C_MULTI)
|
||||
return Left;
|
||||
ParseError();
|
||||
}
|
||||
FreeCommand(Left);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
Cmd = cmd_alloc(sizeof(PARSED_COMMAND));
|
||||
Cmd->Type = OpType;
|
||||
Cmd->Next = NULL;
|
||||
Cmd->Redirections = NULL;
|
||||
Cmd->Subcommands = Left;
|
||||
Left->Next = Right;
|
||||
Right->Next = NULL;
|
||||
}
|
||||
|
||||
return Cmd;
|
||||
}
|
||||
|
||||
PARSED_COMMAND *
|
||||
ParseCommand(LPTSTR Line)
|
||||
{
|
||||
PARSED_COMMAND *Cmd;
|
||||
|
||||
if (Line)
|
||||
{
|
||||
if (!SubstituteVars(Line, ParseLine, _T('%')))
|
||||
return NULL;
|
||||
bLineContinuations = FALSE;
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!ReadLine(ParseLine, FALSE))
|
||||
return NULL;
|
||||
bLineContinuations = TRUE;
|
||||
}
|
||||
bParseError = FALSE;
|
||||
ParsePos = ParseLine;
|
||||
CurChar = _T(' ');
|
||||
|
||||
Cmd = ParseCommandOp(C_OP_LOWEST);
|
||||
if (Cmd)
|
||||
{
|
||||
if (CurrentTokenType != TOK_END)
|
||||
ParseError();
|
||||
if (bParseError)
|
||||
{
|
||||
FreeCommand(Cmd);
|
||||
Cmd = NULL;
|
||||
}
|
||||
bIgnoreEcho = FALSE;
|
||||
}
|
||||
else
|
||||
{
|
||||
bIgnoreEcho = TRUE;
|
||||
}
|
||||
return Cmd;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Reconstruct a parse tree into text form; used for echoing
|
||||
* batch file commands and FOR instances.
|
||||
*/
|
||||
VOID
|
||||
EchoCommand(PARSED_COMMAND *Cmd)
|
||||
{
|
||||
TCHAR Buf[CMDLINE_LENGTH];
|
||||
PARSED_COMMAND *Sub;
|
||||
REDIRECTION *Redir;
|
||||
|
||||
switch (Cmd->Type)
|
||||
{
|
||||
case C_COMMAND:
|
||||
if (SubstituteForVars(Cmd->Command.First, Buf))
|
||||
ConOutPrintf(_T("%s"), Buf);
|
||||
if (SubstituteForVars(Cmd->Command.Rest, Buf))
|
||||
ConOutPrintf(_T("%s"), Buf);
|
||||
break;
|
||||
case C_QUIET:
|
||||
return;
|
||||
case C_BLOCK:
|
||||
ConOutChar(_T('('));
|
||||
Sub = Cmd->Subcommands;
|
||||
if (Sub && !Sub->Next)
|
||||
{
|
||||
/* Single-command block: display all on one line */
|
||||
EchoCommand(Sub);
|
||||
}
|
||||
else if (Sub)
|
||||
{
|
||||
/* Multi-command block: display parenthesis on separate lines */
|
||||
ConOutChar(_T('\n'));
|
||||
do
|
||||
{
|
||||
EchoCommand(Sub);
|
||||
ConOutChar(_T('\n'));
|
||||
Sub = Sub->Next;
|
||||
} while (Sub);
|
||||
}
|
||||
ConOutChar(_T(')'));
|
||||
break;
|
||||
case C_MULTI:
|
||||
case C_IFFAILURE:
|
||||
case C_IFSUCCESS:
|
||||
case C_PIPE:
|
||||
Sub = Cmd->Subcommands;
|
||||
EchoCommand(Sub);
|
||||
ConOutPrintf(_T(" %s "), OpString[Cmd->Type - C_OP_LOWEST]);
|
||||
EchoCommand(Sub->Next);
|
||||
break;
|
||||
case C_IF:
|
||||
ConOutPrintf(_T("if"));
|
||||
if (Cmd->If.Flags & IFFLAG_IGNORECASE)
|
||||
ConOutPrintf(_T(" /I"));
|
||||
if (Cmd->If.Flags & IFFLAG_NEGATE)
|
||||
ConOutPrintf(_T(" not"));
|
||||
if (Cmd->If.LeftArg && SubstituteForVars(Cmd->If.LeftArg, Buf))
|
||||
ConOutPrintf(_T(" %s"), Buf);
|
||||
ConOutPrintf(_T(" %s"), IfOperatorString[Cmd->If.Operator]);
|
||||
if (SubstituteForVars(Cmd->If.RightArg, Buf))
|
||||
ConOutPrintf(_T(" %s "), Buf);
|
||||
Sub = Cmd->Subcommands;
|
||||
EchoCommand(Sub);
|
||||
if (Sub->Next)
|
||||
{
|
||||
ConOutPrintf(_T(" else "));
|
||||
EchoCommand(Sub->Next);
|
||||
}
|
||||
break;
|
||||
case C_FOR:
|
||||
ConOutPrintf(_T("for"));
|
||||
if (Cmd->For.Switches & FOR_DIRS) ConOutPrintf(_T(" /D"));
|
||||
if (Cmd->For.Switches & FOR_F) ConOutPrintf(_T(" /F"));
|
||||
if (Cmd->For.Switches & FOR_LOOP) ConOutPrintf(_T(" /L"));
|
||||
if (Cmd->For.Switches & FOR_RECURSIVE) ConOutPrintf(_T(" /R"));
|
||||
if (Cmd->For.Params)
|
||||
ConOutPrintf(_T(" %s"), Cmd->For.Params);
|
||||
ConOutPrintf(_T(" %%%c in (%s) do "), Cmd->For.Variable, Cmd->For.List);
|
||||
EchoCommand(Cmd->Subcommands);
|
||||
break;
|
||||
}
|
||||
|
||||
for (Redir = Cmd->Redirections; Redir; Redir = Redir->Next)
|
||||
{
|
||||
if (SubstituteForVars(Redir->Filename, Buf))
|
||||
ConOutPrintf(_T(" %c%s%s"), _T('0') + Redir->Number,
|
||||
RedirString[Redir->Mode], Buf);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* "Unparse" a command into a text form suitable for passing to CMD /C.
|
||||
* Used for pipes. This is basically the same thing as EchoCommand, but
|
||||
* writing into a string instead of to standard output.
|
||||
*/
|
||||
TCHAR *
|
||||
Unparse(PARSED_COMMAND *Cmd, TCHAR *Out, TCHAR *OutEnd)
|
||||
{
|
||||
TCHAR Buf[CMDLINE_LENGTH];
|
||||
PARSED_COMMAND *Sub;
|
||||
REDIRECTION *Redir;
|
||||
|
||||
/*
|
||||
* Since this function has the annoying requirement that it must avoid
|
||||
* overflowing the supplied buffer, define some helper macros to make
|
||||
* this less painful.
|
||||
*/
|
||||
#define CHAR(Char) { \
|
||||
if (Out == OutEnd) return NULL; \
|
||||
*Out++ = Char; }
|
||||
#define STRING(String) { \
|
||||
if (Out + _tcslen(String) > OutEnd) return NULL; \
|
||||
Out = _stpcpy(Out, String); }
|
||||
#define PRINTF(Format, ...) { \
|
||||
UINT Len = _sntprintf(Out, OutEnd - Out, Format, __VA_ARGS__); \
|
||||
if (Len > (UINT)(OutEnd - Out)) return NULL; \
|
||||
Out += Len; }
|
||||
#define RECURSE(Subcommand) { \
|
||||
Out = Unparse(Subcommand, Out, OutEnd); \
|
||||
if (!Out) return NULL; }
|
||||
|
||||
switch (Cmd->Type)
|
||||
{
|
||||
case C_COMMAND:
|
||||
/* This is fragile since there could be special characters, but
|
||||
* Windows doesn't bother escaping them, so for compatibility
|
||||
* we probably shouldn't do it either */
|
||||
if (!SubstituteForVars(Cmd->Command.First, Buf)) return NULL;
|
||||
STRING(Buf)
|
||||
if (!SubstituteForVars(Cmd->Command.Rest, Buf)) return NULL;
|
||||
STRING(Buf)
|
||||
break;
|
||||
case C_QUIET:
|
||||
CHAR(_T('@'))
|
||||
RECURSE(Cmd->Subcommands)
|
||||
break;
|
||||
case C_BLOCK:
|
||||
CHAR(_T('('))
|
||||
for (Sub = Cmd->Subcommands; Sub; Sub = Sub->Next)
|
||||
{
|
||||
RECURSE(Sub)
|
||||
if (Sub->Next)
|
||||
CHAR(_T('&'))
|
||||
}
|
||||
CHAR(_T(')'))
|
||||
break;
|
||||
case C_MULTI:
|
||||
case C_IFFAILURE:
|
||||
case C_IFSUCCESS:
|
||||
case C_PIPE:
|
||||
Sub = Cmd->Subcommands;
|
||||
RECURSE(Sub)
|
||||
PRINTF(_T(" %s "), OpString[Cmd->Type - C_OP_LOWEST])
|
||||
RECURSE(Sub->Next)
|
||||
break;
|
||||
case C_IF:
|
||||
STRING(_T("if"))
|
||||
if (Cmd->If.Flags & IFFLAG_IGNORECASE)
|
||||
STRING(_T(" /I"))
|
||||
if (Cmd->If.Flags & IFFLAG_NEGATE)
|
||||
STRING(_T(" not"))
|
||||
if (Cmd->If.LeftArg && SubstituteForVars(Cmd->If.LeftArg, Buf))
|
||||
PRINTF(_T(" %s"), Buf)
|
||||
PRINTF(_T(" %s"), IfOperatorString[Cmd->If.Operator]);
|
||||
if (!SubstituteForVars(Cmd->If.RightArg, Buf)) return NULL;
|
||||
PRINTF(_T(" %s "), Buf)
|
||||
Sub = Cmd->Subcommands;
|
||||
RECURSE(Sub)
|
||||
if (Sub->Next)
|
||||
{
|
||||
STRING(_T(" else "))
|
||||
RECURSE(Sub->Next)
|
||||
}
|
||||
break;
|
||||
case C_FOR:
|
||||
STRING(_T("for"))
|
||||
if (Cmd->For.Switches & FOR_DIRS) STRING(_T(" /D"))
|
||||
if (Cmd->For.Switches & FOR_F) STRING(_T(" /F"))
|
||||
if (Cmd->For.Switches & FOR_LOOP) STRING(_T(" /L"))
|
||||
if (Cmd->For.Switches & FOR_RECURSIVE) STRING(_T(" /R"))
|
||||
if (Cmd->For.Params)
|
||||
PRINTF(_T(" %s"), Cmd->For.Params)
|
||||
PRINTF(_T(" %%%c in (%s) do "), Cmd->For.Variable, Cmd->For.List)
|
||||
RECURSE(Cmd->Subcommands)
|
||||
break;
|
||||
}
|
||||
|
||||
for (Redir = Cmd->Redirections; Redir; Redir = Redir->Next)
|
||||
{
|
||||
if (!SubstituteForVars(Redir->Filename, Buf)) return NULL;
|
||||
PRINTF(_T(" %c%s%s"), _T('0') + Redir->Number,
|
||||
RedirString[Redir->Mode], Buf)
|
||||
}
|
||||
return Out;
|
||||
}
|
||||
|
||||
VOID
|
||||
FreeCommand(PARSED_COMMAND *Cmd)
|
||||
{
|
||||
if (Cmd->Subcommands)
|
||||
FreeCommand(Cmd->Subcommands);
|
||||
if (Cmd->Next)
|
||||
FreeCommand(Cmd->Next);
|
||||
FreeRedirection(Cmd->Redirections);
|
||||
if (Cmd->Type == C_IF)
|
||||
{
|
||||
cmd_free(Cmd->If.LeftArg);
|
||||
cmd_free(Cmd->If.RightArg);
|
||||
}
|
||||
else if (Cmd->Type == C_FOR)
|
||||
{
|
||||
cmd_free(Cmd->For.Params);
|
||||
cmd_free(Cmd->For.List);
|
||||
}
|
||||
cmd_free(Cmd);
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue