/*
* FOR.C - for internal batch command.
*
*
* History:
*
* 16-Jul-1998 (Hans B Pufal)
* Started.
*
* 16-Jul-1998 (John P Price)
* Separated commands into individual files.
*
* 19-Jul-1998 (Hans B Pufal)
* Implementation of FOR.
*
* 27-Jul-1998 (John P Price <linux-guru@gcfl.net>)
* Added config.h include.
*
* 20-Jan-1999 (Eric Kohl)
* Unicode and redirection safe!
*
* 01-Sep-1999 (Eric Kohl)
* Added help text.
*
* 23-Feb-2001 (Carl Nettelblad <cnettel@hem.passagen.se>)
* Implemented preservation of echo flag. Some other for related
* code in other files fixed, too.
*
* 28-Apr-2005 (Magnus Olsen <magnus@greatlord.com>)
* Remove all hardcoded strings in En.rc
*/
#include "precomp.h"
/* FOR is a special command, so this function is only used for showing help now */
INT cmd_for (LPTSTR param)
{
TRACE ("cmd_for (\'%s\')\n", debugstr_aw(param));
if (!_tcsncmp (param, _T("/?"), 2))
{
ConOutResPaging(TRUE,STRING_FOR_HELP1);
return 0;
}
error_syntax(param);
return 1;
}
/* The stack of current FOR contexts.
* NULL when no FOR command is active */
LPFOR_CONTEXT fc = NULL;
/* Get the next element of the FOR's list */
static BOOL GetNextElement(TCHAR **pStart, TCHAR **pEnd)
{
TCHAR *p = *pEnd;
BOOL InQuotes = FALSE;
while (_istspace(*p))
p++;
if (!*p)
return FALSE;
*pStart = p;
while (*p && (InQuotes || !_istspace(*p)))
InQuotes ^= (*p++ == _T('"'));
*pEnd = p;
return TRUE;
}
/* Execute a single instance of a FOR command */
static INT RunInstance(PARSED_COMMAND *Cmd)
{
if (bEcho && !bDisableBatchEcho && Cmd->Subcommands->Type != C_QUIET)
{
if (!bIgnoreEcho)
ConOutChar(_T('\n'));
PrintPrompt();
EchoCommand(Cmd->Subcommands);
ConOutChar(_T('\n'));
}
/* Just run the command (variable expansion is done in DoDelayedExpansion) */
return ExecuteCommand(Cmd->Subcommands);
}
/* Check if this FOR should be terminated early */
static BOOL Exiting(PARSED_COMMAND *Cmd)
{
/* Someone might have removed our context */
return bCtrlBreak || fc != Cmd->For.Context;
}
/* Read the contents of a text file into memory,
* dynamically allocating enough space to hold it all */
static LPTSTR ReadFileContents(FILE *InputFile, TCHAR *Buffer)
{
SIZE_T Len = 0;
SIZE_T AllocLen = 1000;
LPTSTR Contents = cmd_alloc(AllocLen * sizeof(TCHAR));
if (!Contents)
return NULL;
while (_fgetts(Buffer, CMDLINE_LENGTH, InputFile))
{
ULONG_PTR CharsRead = _tcslen(Buffer);
while (Len + CharsRead >= AllocLen)
{
LPTSTR OldContents = Contents;
Contents = cmd_realloc(Contents, (AllocLen *= 2) * sizeof(TCHAR));
if (!Contents)
{
cmd_free(OldContents);
return NULL;
}
}
_tcscpy(&Contents[Len], Buffer);
Len += CharsRead;
}
Contents[Len] = _T('\0');
return Contents;
}
static INT ForF(PARSED_COMMAND *Cmd, LPTSTR List, TCHAR *Buffer)
{
LPTSTR Delims = _T(" \t");
TCHAR Eol = _T(';');
INT SkipLines = 0;
DWORD Tokens = (1 << 1);
BOOL RemainderVar = FALSE;
TCHAR StringQuote = _T('"');
TCHAR CommandQuote = _T('\'');
LPTSTR Variables[32];
TCHAR *Start, *End;
INT i;
INT Ret = 0;
if (Cmd->For.Params)
{
TCHAR Quote = 0;
TCHAR *Param = Cmd->For.Params;
if (*Param == _T('"') || *Param == _T('\''))
Quote = *Param++;
while (*Param && *Param != Quote)
{
if (*Param <= _T(' '))
{
Param++;
}
else if (_tcsnicmp(Param, _T("delims="), 7) == 0)
{
Param += 7;
/* delims=xxx: Specifies the list of characters that separate tokens */
Delims = Param;
while (*Param && *Param != Quote)
{
if (*Param == _T(' '))
{
TCHAR *FirstSpace = Param;
Param += _tcsspn(Param, _T(" "));
/* Exclude trailing spaces if this is not the last parameter */
if (*Param && *Param != Quote)
*FirstSpace = _T('\0');
break;
}
Param++;
}
if (*Param == Quote)
*Param++ = _T('\0');
}
else if (_tcsnicmp(Param, _T("eol="), 4) == 0)
{
Param += 4;
/* eol=c: Lines starting with this character (may be
* preceded by delimiters) are skipped. */
Eol = *Param;
if (Eol != _T('\0'))
Param++;
}
else if (_tcsnicmp(Param, _T("skip="), 5) == 0)
{
/* skip=n: Number of lines to skip at the beginning of each file */
SkipLines = _tcstol(Param + 5, &Param, 0);
if (SkipLines <= 0)
goto error;
}
else if (_tcsnicmp(Param, _T("tokens="), 7) == 0)
{
Param += 7;
/* tokens=x,y,m-n: List of token numbers (must be between
* 1 and 31) that will be assigned into variables. */
Tokens = 0;
while (*Param && *Param != Quote && *Param != _T('*'))
{
INT First = _tcstol(Param, &Param, 0);
INT Last = First;
if (First < 1)
goto error;
if (*Param == _T('-'))
{
/* It's a range of tokens */
Last = _tcstol(Param + 1, &Param, 0);
if (Last < First || Last > 31)
goto error;
}
Tokens |= (2 << Last) - (1 << First);
if (*Param != _T(','))
break;
Param++;
}
/* With an asterisk at the end, an additional variable
* will be created to hold the remainder of the line
* (after the last token specified). */
if (*Param == _T('*'))
{
RemainderVar = TRUE;
Param++;
}
}
else if (_tcsnicmp(Param, _T("useback"), 7) == 0)
{
Param += 7;
/* usebackq: Use alternate quote characters */
StringQuote = _T('\'');
CommandQuote = _T('`');
/* Can be written as either "useback" or "usebackq" */
if (_totlower(*Param) == _T('q'))
Param++;
}
else
{
error:
error_syntax(Param);
return 1;
}
}
}
/* Count how many variables will be set: one for each token,
* plus maybe one for the remainder */
fc->varcount = RemainderVar;
for (i = 1; i < 32; i++)
fc->varcount += (Tokens >> i & 1);
fc->values = Variables;
if (*List == StringQuote || *List == CommandQuote)
{
/* Treat the entire "list" as one single element */
Start = List;
End = &List[_tcslen(List)];
goto single_element;
}
End = List;
while (GetNextElement(&Start, &End))
{
FILE *InputFile;
LPTSTR FullInput, In, NextLine;
INT Skip;
single_element:
if (*Start == StringQuote && End[-1] == StringQuote)
{
/* Input given directly as a string */
End[-1] = _T('\0');
FullInput = cmd_dup(Start + 1);
}
else if (*Start == CommandQuote && End[-1] == CommandQuote)
{
/* Read input from a command */
End[-1] = _T('\0');
InputFile = _tpopen(Start + 1, _T("r"));
if (!InputFile)
{
error_bad_command(Start + 1);
return 1;
}
FullInput = ReadFileContents(InputFile, Buffer);
_pclose(InputFile);
}
else
{
/* Read input from a file */
TCHAR Temp = *End;
*End = _T('\0');
StripQuotes(Start);
InputFile = _tfopen(Start, _T("r"));
*End = Temp;
if (!InputFile)
{
error_sfile_not_found(Start);
return 1;
}
FullInput = ReadFileContents(InputFile, Buffer);
fclose(InputFile);
}
if (!FullInput)
{
error_out_of_memory();
return 1;
}
/* Loop over the input line by line */
In = FullInput;
Skip = SkipLines;
do
{
DWORD RemainingTokens = Tokens;
LPTSTR *CurVar = Variables;
NextLine = _tcschr(In, _T('\n'));
if (NextLine)
*NextLine++ = _T('\0');
if (--Skip >= 0)
continue;
/* Ignore lines where the first token starts with the eol character */
In += _tcsspn(In, Delims);
if (*In == Eol)
continue;
while ((RemainingTokens >>= 1) != 0)
{
/* Save pointer to this token in a variable if requested */
if (RemainingTokens & 1)
*CurVar++ = In;
/* Find end of token */
In += _tcscspn(In, Delims);
/* Nul-terminate it and advance to next token */
if (*In)
{
*In++ = _T('\0');
In += _tcsspn(In, Delims);
}
}
/* Save pointer to remainder of line */
*CurVar = In;
/* Don't run unless the line had enough tokens to fill at least one variable */
if (*Variables[0])
Ret = RunInstance(Cmd);
} while (!Exiting(Cmd) && (In = NextLine) != NULL);
cmd_free(FullInput);
}
return Ret;
}
/* FOR /L: Do a numeric loop */
static INT ForLoop(PARSED_COMMAND *Cmd, LPTSTR List, TCHAR *Buffer)
{
enum { START, STEP, END };
INT params[3] = { 0, 0, 0 };
INT i;
INT Ret = 0;
TCHAR *Start, *End = List;
for (i = 0; i < 3 && GetNextElement(&Start, &End); i++)
params[i] = _tcstol(Start, NULL, 0);
i = params[START];
while (!Exiting(Cmd) &&
(params[STEP] >= 0 ? (i <= params[END]) : (i >= params[END])))
{
_itot(i, Buffer, 10);
Ret = RunInstance(Cmd);
i += params[STEP];
}
return Ret;
}
/* Process a FOR in one directory. Stored in Buffer (up to BufPos) is a
* string which is prefixed to each element of the list. In a normal FOR
* it will be empty, but in FOR /R it will be the directory name. */
static INT ForDir(PARSED_COMMAND *Cmd, LPTSTR List, TCHAR *Buffer, TCHAR *BufPos)
{
TCHAR *Start, *End = List;
INT Ret = 0;
while (!Exiting(Cmd) && GetNextElement(&Start, &End))
{
if (BufPos + (End - Start) > &Buffer[CMDLINE_LENGTH])
continue;
memcpy(BufPos, Start, (End - Start) * sizeof(TCHAR));
BufPos[End - Start] = _T('\0');
if (_tcschr(BufPos, _T('?')) || _tcschr(BufPos, _T('*')))
{
WIN32_FIND_DATA w32fd;
HANDLE hFind;
TCHAR *FilePart;
StripQuotes(BufPos);
hFind = FindFirstFile(Buffer, &w32fd);
if (hFind == INVALID_HANDLE_VALUE)
continue;
FilePart = _tcsrchr(BufPos, _T('\\'));
FilePart = FilePart ? FilePart + 1 : BufPos;
do
{
if (w32fd.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN)
continue;
if (!(w32fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
!= !(Cmd->For.Switches & FOR_DIRS))
continue;
if (_tcscmp(w32fd.cFileName, _T(".")) == 0 ||
_tcscmp(w32fd.cFileName, _T("..")) == 0)
continue;
_tcscpy(FilePart, w32fd.cFileName);
Ret = RunInstance(Cmd);
} while (!Exiting(Cmd) && FindNextFile(hFind, &w32fd));
FindClose(hFind);
}
else
{
Ret = RunInstance(Cmd);
}
}
return Ret;
}
/* FOR /R: Process a FOR in each directory of a tree, recursively. */
static INT ForRecursive(PARSED_COMMAND *Cmd, LPTSTR List, TCHAR *Buffer, TCHAR *BufPos)
{
HANDLE hFind;
WIN32_FIND_DATA w32fd;
INT Ret = 0;
if (BufPos[-1] != _T('\\'))
{
*BufPos++ = _T('\\');
*BufPos = _T('\0');
}
Ret = ForDir(Cmd, List, Buffer, BufPos);
_tcscpy(BufPos, _T("*"));
hFind = FindFirstFile(Buffer, &w32fd);
if (hFind == INVALID_HANDLE_VALUE)
return Ret;
do
{
if (!(w32fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
continue;
if (_tcscmp(w32fd.cFileName, _T(".")) == 0 ||
_tcscmp(w32fd.cFileName, _T("..")) == 0)
continue;
Ret = ForRecursive(Cmd, List, Buffer, _stpcpy(BufPos, w32fd.cFileName));
} while (!Exiting(Cmd) && FindNextFile(hFind, &w32fd));
FindClose(hFind);
return Ret;
}
BOOL
ExecuteFor(PARSED_COMMAND *Cmd)
{
TCHAR Buffer[CMDLINE_LENGTH]; /* Buffer to hold the variable value */
LPTSTR BufferPtr = Buffer;
LPFOR_CONTEXT lpNew;
INT Ret;
LPTSTR List = DoDelayedExpansion(Cmd->For.List);
if (!List)
return 1;
/* Create our FOR context */
lpNew = cmd_alloc(sizeof(FOR_CONTEXT));
if (!lpNew)
{
cmd_free(List);
return 1;
}
lpNew->prev = fc;
lpNew->firstvar = Cmd->For.Variable;
lpNew->varcount = 1;
lpNew->values = &BufferPtr;
Cmd->For.Context = lpNew;
fc = lpNew;
if (Cmd->For.Switches & FOR_F)
{
Ret = ForF(Cmd, List, Buffer);
}
else if (Cmd->For.Switches & FOR_LOOP)
{
Ret = ForLoop(Cmd, List, Buffer);
}
else if (Cmd->For.Switches & FOR_RECURSIVE)
{
DWORD Len = GetFullPathName(Cmd->For.Params ? Cmd->For.Params : _T("."),
MAX_PATH, Buffer, NULL);
Ret = ForRecursive(Cmd, List, Buffer, &Buffer[Len]);
}
else
{
Ret = ForDir(Cmd, List, Buffer, Buffer);
}
/* Remove our context, unless someone already did that */
if (fc == lpNew)
fc = lpNew->prev;
cmd_free(lpNew);
cmd_free(List);
return Ret;
}
/* EOF */