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4e697fee2c
As code grows, this will allow for better maintenance of the console stream code. In particular the input stream module will contain special code for handling TTYs, and this is something not all console programs will need. Having this code in a separate module will allow for the linker to possibly remove this code when it is unused.
159 lines
3.9 KiB
C
159 lines
3.9 KiB
C
/*
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* PROJECT: ReactOS Console Utilities Library
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* LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
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* PURPOSE: Console/terminal paging functionality.
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* COPYRIGHT: Copyright 2017-2018 ReactOS Team
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* Copyright 2017-2018 Hermes Belusca-Maito
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*/
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/* FIXME: Temporary HACK before we cleanly support UNICODE functions */
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#define UNICODE
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#define _UNICODE
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#include <windef.h>
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#include <winbase.h>
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// #include <winnls.h>
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#include <wincon.h> // Console APIs (only if kernel32 support included)
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#include <strsafe.h>
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#include "conutils.h"
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#include "stream.h"
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#include "screen.h"
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#include "pager.h"
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// Temporary HACK
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#define CON_STREAM_WRITE ConStreamWrite
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/* Returns TRUE when all the text is displayed, and FALSE if display is stopped */
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BOOL
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ConWritePaging(
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IN PCON_PAGER Pager,
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IN PAGE_PROMPT PagePrompt,
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IN BOOL StartPaging,
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IN PTCHAR szStr,
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IN DWORD len)
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{
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CONSOLE_SCREEN_BUFFER_INFO csbi;
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/* Used to see how big the screen is */
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DWORD ScreenLines = 0;
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/* Chars since start of line */
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DWORD CharSL;
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DWORD from = 0, i = 0;
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/* Parameters validation */
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if (!Pager)
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return FALSE;
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/* Reset LineCount and return if no string has been given */
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if (StartPaging == TRUE)
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Pager->LineCount = 0;
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if (szStr == NULL)
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return TRUE;
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/* Get the size of the visual screen that can be printed to */
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if (!ConGetScreenInfo(Pager->Screen, &csbi))
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{
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/* We assume it's a file handle */
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CON_STREAM_WRITE(Pager->Screen->Stream, szStr, len);
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return TRUE;
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}
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/*
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* Get the number of lines currently displayed on screen, minus 1
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* to account for the "press any key..." prompt from PagePrompt().
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*/
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ScreenLines = (csbi.srWindow.Bottom - csbi.srWindow.Top);
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CharSL = csbi.dwCursorPosition.X;
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/* Make sure the user doesn't have the screen too small */
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if (ScreenLines < 4)
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{
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CON_STREAM_WRITE(Pager->Screen->Stream, szStr, len);
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return TRUE;
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}
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while (i < len)
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{
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/* Search until the end of a line is reached */
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if (szStr[i++] != TEXT('\n') && ++CharSL < csbi.dwSize.X)
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continue;
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Pager->LineCount++;
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CharSL = 0;
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if (Pager->LineCount >= ScreenLines)
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{
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CON_STREAM_WRITE(Pager->Screen->Stream, &szStr[from], i-from);
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from = i;
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/* Prompt the user; give him some values for statistics */
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// FIXME TODO: The prompt proc can also take ScreenLines ??
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if (!PagePrompt(Pager, from, len))
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return FALSE;
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// TODO: Recalculate 'ScreenLines' in case the user redimensions
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// the window during the prompt.
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/* Reset the number of lines being printed */
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Pager->LineCount = 0;
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}
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}
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if (i > from)
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CON_STREAM_WRITE(Pager->Screen->Stream, &szStr[from], i-from);
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return TRUE;
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}
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BOOL
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ConPutsPaging(
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IN PCON_PAGER Pager,
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IN PAGE_PROMPT PagePrompt,
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IN BOOL StartPaging,
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IN LPTSTR szStr)
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{
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DWORD len;
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/* Return if no string has been given */
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if (szStr == NULL)
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return TRUE;
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len = wcslen(szStr);
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return ConWritePaging(Pager, PagePrompt, StartPaging, szStr, len);
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}
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BOOL
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ConResPagingEx(
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IN PCON_PAGER Pager,
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IN PAGE_PROMPT PagePrompt,
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IN BOOL StartPaging,
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IN HINSTANCE hInstance OPTIONAL,
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IN UINT uID)
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{
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INT Len;
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PWCHAR szStr = NULL;
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Len = K32LoadStringW(hInstance, uID, (PWSTR)&szStr, 0);
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if (szStr && Len)
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return ConWritePaging(Pager, PagePrompt, StartPaging, szStr, Len);
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else
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return TRUE;
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}
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BOOL
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ConResPaging(
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IN PCON_PAGER Pager,
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IN PAGE_PROMPT PagePrompt,
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IN BOOL StartPaging,
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IN UINT uID)
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{
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return ConResPagingEx(Pager, PagePrompt, StartPaging,
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NULL /*GetModuleHandleW(NULL)*/, uID);
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}
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/* EOF */
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