reactos/rosapps/cmdutils/more/more.c

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/*
* MORE.C - external command.
*
* clone from 4nt more command
*
* 26 Sep 1999 - Paolo Pantaleo <paolopan@freemail.it>
* started
* Oct 2003 - Timothy Schepens <tischepe at fastmail dot fm>
* use window size instead of buffer size.
*/
#include <windows.h>
#include <malloc.h>
#include <tchar.h>
DWORD len;
LPTSTR msg = _T("--- continue ---");
/*handle for file and console*/
HANDLE hStdIn;
HANDLE hStdOut;
HANDLE hStdErr;
HANDLE hKeyboard;
static VOID
GetScreenSize (PSHORT maxx, PSHORT maxy)
{
CONSOLE_SCREEN_BUFFER_INFO csbi;
GetConsoleScreenBufferInfo (hStdOut, &csbi);
*maxx = (csbi.srWindow.Right - csbi.srWindow.Left) + 1;
*maxy = (csbi.srWindow.Bottom - csbi.srWindow.Top) - 4;
}
static
VOID ConOutPuts (LPTSTR szText)
{
DWORD dwWritten;
WriteFile (GetStdHandle (STD_OUTPUT_HANDLE), szText, _tcslen(szText), &dwWritten, NULL);
WriteFile (GetStdHandle (STD_OUTPUT_HANDLE), "\n", 1, &dwWritten, NULL);
}
static VOID
ConInKey (VOID)
{
INPUT_RECORD ir;
DWORD dwRead;
do
{
ReadConsoleInput (hKeyboard, &ir, 1, &dwRead);
if ((ir.EventType == KEY_EVENT) &&
(ir.Event.KeyEvent.bKeyDown == TRUE))
return;
}
while (TRUE);
}
static VOID
WaitForKey (VOID)
{
DWORD dwWritten;
WriteFile (hStdErr,msg , len, &dwWritten, NULL);
ConInKey();
WriteFile (hStdErr, _T("\n"), 1, &dwWritten, NULL);
// FlushConsoleInputBuffer (hConsoleIn);
}
//INT CommandMore (LPTSTR cmd, LPTSTR param)
int main (int argc, char **argv)
{
SHORT maxx,maxy;
SHORT line_count=0,ch_count=0;
INT i, last;
HANDLE hFile = INVALID_HANDLE_VALUE;
TCHAR szFullPath[MAX_PATH];
/*reading/writing buffer*/
TCHAR *buff;
/*bytes written by WriteFile and ReadFile*/
DWORD dwRead,dwWritten;
/*ReadFile() return value*/
BOOL bRet;
len = _tcslen (msg);
hStdIn = GetStdHandle(STD_INPUT_HANDLE);
hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
hStdErr = GetStdHandle(STD_ERROR_HANDLE);
if (argc > 1 && _tcsncmp (argv[1], _T("/?"), 2) == 0)
{
ConOutPuts(_T("Help text still missing!!"));
return 0;
}
hKeyboard = CreateFile (_T("CONIN$"), GENERIC_READ,
0,NULL,OPEN_ALWAYS,0,0);
GetScreenSize(&maxx,&maxy);
buff=malloc(4096);
FlushConsoleInputBuffer (hKeyboard);
if(argc > 1)
{
GetFullPathName(argv[1], MAX_PATH, szFullPath, NULL);
hFile = CreateFile (szFullPath, GENERIC_READ,
0,NULL,OPEN_ALWAYS,0,0);
}
do
{
if(hFile != INVALID_HANDLE_VALUE)
{
bRet = ReadFile(hFile,buff,4096,&dwRead,NULL);
}
else
{
bRet = ReadFile(hStdIn,buff,4096,&dwRead,NULL);
}
for(last=i=0;i<dwRead && bRet;i++)
{
ch_count++;
if(buff[i] == _T('\n') || ch_count == maxx)
{
ch_count=0;
line_count++;
if (line_count == maxy)
{
line_count = 0;
WriteFile(hStdOut,&buff[last], i-last+1, &dwWritten, NULL);
last=i+1;
FlushFileBuffers (hStdOut);
WaitForKey ();
}
}
}
if (last<dwRead && bRet)
WriteFile(hStdOut,&buff[last], dwRead-last, &dwWritten, NULL);
}
while(dwRead>0 && bRet);
free (buff);
CloseHandle (hKeyboard);
CloseHandle (hFile);
return 0;
}
/* EOF */