Diffstat (limited to 'core/apps/embeddedkonsole/TEHistory.cpp') (more/less context) (ignore whitespace changes)
| -rw-r--r-- | core/apps/embeddedkonsole/TEHistory.cpp | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/core/apps/embeddedkonsole/TEHistory.cpp b/core/apps/embeddedkonsole/TEHistory.cpp new file mode 100644 index 0000000..317ce57 --- a/dev/null +++ b/core/apps/embeddedkonsole/TEHistory.cpp @@ -0,0 +1,212 @@ +/* -------------------------------------------------------------------------- */ +/* */ +/* [TEHistory.C] History Buffer */ +/* */ +/* -------------------------------------------------------------------------- */ +/* */ +/* Copyright (c) 1997,1998 by Lars Doelle <lars.doelle@on-line.de> */ +/* */ +/* This file is part of Konsole - an X terminal for KDE */ +/* */ +/* -------------------------------------------------------------------------- */ +/* */ +/* Ported Konsole to Qt/Embedded */ +/* */ +/* Copyright (C) 2000 by John Ryland <jryland@trolltech.com> */ +/* */ +/* -------------------------------------------------------------------------- */ + +#include "TEHistory.h" +#include <stdlib.h> +#include <assert.h> +#include <stdio.h> +#include <sys/types.h> +#include <unistd.h> +#include <errno.h> + +#define HERE printf("%s(%d): here\n",__FILE__,__LINE__) + +/* + An arbitrary long scroll. + + One can modify the scroll only by adding either cells + or newlines, but access it randomly. + + The model is that of an arbitrary wide typewriter scroll + in that the scroll is a serie of lines and each line is + a serie of cells with no overwriting permitted. + + The implementation provides arbitrary length and numbers + of cells and line/column indexed read access to the scroll + at constant costs. + +FIXME: some complain about the history buffer comsuming the + memory of their machines. This problem is critical + since the history does not behave gracefully in cases + where the memory is used up completely. + + I put in a workaround that should handle it problem + now gracefully. I'm not satisfied with the solution. + +FIXME: Terminating the history is not properly indicated + in the menu. We should throw a signal. + +FIXME: There is noticable decrease in speed, also. Perhaps, + there whole feature needs to be revisited therefore. + Disadvantage of a more elaborated, say block-oriented + scheme with wrap around would be it's complexity. +*/ + +//FIXME: tempory replacement for tmpfile +// this is here one for debugging purpose. + +//#define tmpfile xTmpFile + +FILE* xTmpFile() +{ + static int fid = 0; + char fname[80]; + sprintf(fname,"TmpFile.%d",fid++); + return fopen(fname,"w"); +} + + +// History Buffer /////////////////////////////////////////// + +/* + A Row(X) data type which allows adding elements to the end. +*/ + +HistoryBuffer::HistoryBuffer() +{ + ion = -1; + length = 0; +} + +HistoryBuffer::~HistoryBuffer() +{ + setScroll(FALSE); +} + +void HistoryBuffer::setScroll(bool on) +{ + if (on == hasScroll()) return; + + if (on) + { + assert( ion < 0 ); + assert( length == 0); + FILE* tmp = tmpfile(); if (!tmp) { perror("konsole: cannot open temp file.\n"); return; } + ion = dup(fileno(tmp)); if (ion<0) perror("konsole: cannot dup temp file.\n"); + fclose(tmp); + } + else + { + assert( ion >= 0 ); + close(ion); + ion = -1; + length = 0; + } +} + +bool HistoryBuffer::hasScroll() +{ + return ion >= 0; +} + +void HistoryBuffer::add(const unsigned char* bytes, int len) +{ int rc; + assert(hasScroll()); + rc = lseek(ion,length,SEEK_SET); if (rc < 0) { perror("HistoryBuffer::add.seek"); setScroll(FALSE); return; } + rc = write(ion,bytes,len); if (rc < 0) { perror("HistoryBuffer::add.write"); setScroll(FALSE); return; } + length += rc; +} + +void HistoryBuffer::get(unsigned char* bytes, int len, int loc) +{ int rc; + assert(hasScroll()); + if (loc < 0 || len < 0 || loc + len > length) + fprintf(stderr,"getHist(...,%d,%d): invalid args.\n",len,loc); + rc = lseek(ion,loc,SEEK_SET); if (rc < 0) { perror("HistoryBuffer::get.seek"); setScroll(FALSE); return; } + rc = read(ion,bytes,len); if (rc < 0) { perror("HistoryBuffer::get.read"); setScroll(FALSE); return; } +} + +int HistoryBuffer::len() +{ + return length; +} + +// History Scroll ////////////////////////////////////// + +/* + The history scroll makes a Row(Row(Cell)) from + two history buffers. The index buffer contains + start of line positions which refere to the cells + buffer. + + Note that index[0] addresses the second line + (line #1), while the first line (line #0) starts + at 0 in cells. +*/ + +HistoryScroll::HistoryScroll() +{ +} + +HistoryScroll::~HistoryScroll() +{ +} + +void HistoryScroll::setScroll(bool on) +{ + index.setScroll(on); + cells.setScroll(on); +} + +bool HistoryScroll::hasScroll() +{ + return index.hasScroll() && cells.hasScroll(); +} + +int HistoryScroll::getLines() +{ + if (!hasScroll()) return 0; + return index.len() / sizeof(int); +} + +int HistoryScroll::getLineLen(int lineno) +{ + if (!hasScroll()) return 0; + return (startOfLine(lineno+1) - startOfLine(lineno)) / sizeof(ca); +} + +int HistoryScroll::startOfLine(int lineno) +{ + if (lineno <= 0) return 0; + if (!hasScroll()) return 0; + if (lineno <= getLines()) + { int res; + index.get((unsigned char*)&res,sizeof(int),(lineno-1)*sizeof(int)); + return res; + } + return cells.len(); +} + +void HistoryScroll::getCells(int lineno, int colno, int count, ca res[]) +{ + assert(hasScroll()); + cells.get((unsigned char*)res,count*sizeof(ca),startOfLine(lineno)+colno*sizeof(ca)); +} + +void HistoryScroll::addCells(ca text[], int count) +{ + if (!hasScroll()) return; + cells.add((unsigned char*)text,count*sizeof(ca)); +} + +void HistoryScroll::addLine() +{ + if (!hasScroll()) return; + int locn = cells.len(); + index.add((unsigned char*)&locn,sizeof(int)); +} |