cmdline_8c-source.html

国外牛人公开的ＡＶＲ代码

00225         cmdlineOutputFunc(ASCII_CR);
00226         cmdlineOutputFunc(ASCII_LF);
00227         <span class="comment">// add null termination to command</span>
00228         CmdlineBuffer[CmdlineBufferLength++] = 0;
00229         CmdlineBufferEditPos++;
00230         <span class="comment">// command is complete, process it</span>
00231         cmdlineProcessInputString();
00232         <span class="comment">// reset buffer</span>
00233         CmdlineBufferLength = 0;
00234         CmdlineBufferEditPos = 0;
00235     }
00236     <span class="keywordflow">else</span> <span class="keywordflow">if</span>(c == ASCII_BS)
00237     {
00238         <span class="keywordflow">if</span>(CmdlineBufferEditPos)
00239         {
00240             <span class="comment">// is this a simple delete (off the end of the line)</span>
00241             <span class="keywordflow">if</span>(CmdlineBufferEditPos == CmdlineBufferLength)
00242             {
00243                 <span class="comment">// destructive backspace</span>
00244                 <span class="comment">// echo backspace-space-backspace</span>
00245                 cmdlineOutputFunc(ASCII_BS);
00246                 cmdlineOutputFunc(<span class="charliteral">' '</span>);
00247                 cmdlineOutputFunc(ASCII_BS);
00248                 <span class="comment">// decrement our buffer length and edit position</span>
00249                 CmdlineBufferLength--;
00250                 CmdlineBufferEditPos--;
00251             }
00252             <span class="keywordflow">else</span>
00253             {
00254                 <span class="comment">// edit/cursor position != end of buffer</span>
00255                 <span class="comment">// we're deleting characters at a mid-line edit position</span>
00256                 <span class="comment">// shift characters down, effectively deleting</span>
00257                 CmdlineBufferLength--;
00258                 CmdlineBufferEditPos--;
00259                 <span class="keywordflow">for</span>(i=CmdlineBufferEditPos; i&lt;CmdlineBufferLength; i++)
00260                     CmdlineBuffer[i] = CmdlineBuffer[i+1];
00261                 <span class="comment">// repaint</span>
00262                 cmdlineRepaint();
00263                 <span class="comment">// add space to clear leftover characters</span>
00264                 cmdlineOutputFunc(<span class="charliteral">' '</span>);
00265                 <span class="comment">// reposition cursor</span>
00266                 <span class="keywordflow">for</span>(i=CmdlineBufferEditPos; i&lt;(CmdlineBufferLength+1); i++)
00267                     cmdlineOutputFunc(ASCII_BS);
00268             }
00269         }
00270         <span class="keywordflow">else</span>
00271         {
00272             <span class="comment">// else, ring the bell</span>
00273             cmdlineOutputFunc(ASCII_BEL);
00274         }
00275     }
00276     <span class="keywordflow">else</span> <span class="keywordflow">if</span>(c == ASCII_DEL)
00277     {
00278         <span class="comment">// not yet handled</span>
00279     }
00280     <span class="keywordflow">else</span> <span class="keywordflow">if</span>(c == ASCII_ESC)
00281     {
00282         CmdlineInputVT100State = 1;
00283     }
00284 }
00285 
00286 <span class="keywordtype">void</span> cmdlineRepaint(<span class="keywordtype">void</span>)
00287 {
00288     u08* ptr;
00289     u08 i;
00290 
00291     <span class="comment">// carriage return</span>
00292     cmdlineOutputFunc(ASCII_CR);
00293     <span class="comment">// print fresh prompt</span>
00294     cmdlinePrintPrompt();
00295     <span class="comment">// print the new command line buffer</span>
00296     i = CmdlineBufferLength;
00297     ptr = CmdlineBuffer;
00298     <span class="keywordflow">while</span>(i--) cmdlineOutputFunc(*ptr++);
00299 }
00300 
00301 <span class="keywordtype">void</span> cmdlineDoHistory(u08 action)
00302 {
00303     <span class="keywordflow">switch</span>(action)
00304     {
00305     <span class="keywordflow">case</span> CMDLINE_HISTORY_SAVE:
00306         <span class="comment">// copy CmdlineBuffer to history if not null string</span>
00307         <span class="keywordflow">if</span>( strlen(CmdlineBuffer) )
00308             strcpy(CmdlineHistory[0], CmdlineBuffer);
00309         <span class="keywordflow">break</span>;
00310     <span class="keywordflow">case</span> CMDLINE_HISTORY_PREV:
00311         <span class="comment">// copy history to current buffer</span>
00312         strcpy(CmdlineBuffer, CmdlineHistory[0]);
00313         <span class="comment">// set the buffer position to the end of the line</span>
00314         CmdlineBufferLength = strlen(CmdlineBuffer);
00315         CmdlineBufferEditPos = CmdlineBufferLength;
00316         <span class="comment">// "re-paint" line</span>
00317         cmdlineRepaint();
00318         <span class="keywordflow">break</span>;
00319     <span class="keywordflow">case</span> CMDLINE_HISTORY_NEXT:
00320         <span class="keywordflow">break</span>;
00321     }
00322 }
00323 
00324 <span class="keywordtype">void</span> cmdlineProcessInputString(<span class="keywordtype">void</span>)
00325 {
00326     u08 cmdIndex;
00327     u08 i=0;
00328 
00329     <span class="comment">// save command in history</span>
00330     cmdlineDoHistory(CMDLINE_HISTORY_SAVE);
00331 
00332     <span class="comment">// find the end of the command (excluding arguments)</span>
00333     <span class="comment">// find first whitespace character in CmdlineBuffer</span>
00334     <span class="keywordflow">while</span>( !((CmdlineBuffer[i] == <span class="charliteral">' '</span>) || (CmdlineBuffer[i] == 0)) ) i++;
00335 
00336     <span class="keywordflow">if</span>(!i)
00337     {
00338         <span class="comment">// command was null or empty</span>
00339         <span class="comment">// output a new prompt</span>
00340         cmdlinePrintPrompt();
00341         <span class="comment">// we're done</span>
00342         <span class="keywordflow">return</span>;
00343     }
00344 
00345     <span class="comment">// search command list for match with entered command</span>
00346     <span class="keywordflow">for</span>(cmdIndex=0; cmdIndex&lt;CmdlineNumCommands; cmdIndex++)
00347     {
00348         <span class="keywordflow">if</span>( !strncmp(CmdlineCommandList[cmdIndex], CmdlineBuffer, i) )
00349         {
00350             <span class="comment">// user-entered command matched a command in the list (database)</span>
00351             <span class="comment">// run the corresponding function</span>
00352             CmdlineExecFunction = CmdlineFunctionList[cmdIndex];
00353             <span class="comment">// new prompt will be output after user function runs</span>
00354             <span class="comment">// and we're done</span>
00355             <span class="keywordflow">return</span>;
00356         }
00357     }
00358 
00359     <span class="comment">// if we did not get a match</span>
00360     <span class="comment">// output an error message</span>
00361     cmdlinePrintError();
00362     <span class="comment">// output a new prompt</span>
00363     cmdlinePrintPrompt();
00364 }
00365 
<a name="l00366"></a><a class="code" href="group__cmdline.html#ga5">00366</a> <span class="keywordtype">void</span> <a class="code" href="group__cmdline.html#ga5">cmdlineMainLoop</a>(<span class="keywordtype">void</span>)
00367 {
00368     <span class="comment">// do we have a command/function to be executed</span>
00369     <span class="keywordflow">if</span>(CmdlineExecFunction)
00370     {
00371         <span class="comment">// run it</span>
00372         CmdlineExecFunction();
00373         <span class="comment">// reset</span>
00374         CmdlineExecFunction = 0;
00375         <span class="comment">// output new prompt</span>
00376         cmdlinePrintPrompt();
00377     }
00378 }
00379 
00380 <span class="keywordtype">void</span> cmdlinePrintPrompt(<span class="keywordtype">void</span>)
00381 {
00382     <span class="comment">// print a new command prompt</span>
00383     u08* ptr = CmdlinePrompt;
00384     <span class="keywordflow">while</span>(pgm_read_byte(ptr)) cmdlineOutputFunc( pgm_read_byte(ptr++) );
00385 }
00386 
00387 <span class="keywordtype">void</span> cmdlinePrintError(<span class="keywordtype">void</span>)
00388 {
00389     u08 * ptr;
00390 
00391     <span class="comment">// print a notice header</span>
00392     <span class="comment">// (u08*) cast used to avoid compiler warning</span>
00393     ptr = (u08*)CmdlineNotice;
00394     <span class="keywordflow">while</span>(pgm_read_byte(ptr)) cmdlineOutputFunc( pgm_read_byte(ptr++) );
00395     
00396     <span class="comment">// print the offending command</span>
00397     ptr = CmdlineBuffer;
00398     <span class="keywordflow">while</span>((*ptr) &amp;&amp; (*ptr != <span class="charliteral">' '</span>)) cmdlineOutputFunc(*ptr++);
00399 
00400     cmdlineOutputFunc(<span class="charliteral">':'</span>);
00401     cmdlineOutputFunc(<span class="charliteral">' '</span>);
00402 
00403     <span class="comment">// print the not-found message</span>
00404     <span class="comment">// (u08*) cast used to avoid compiler warning</span>
00405     ptr = (u08*)CmdlineCmdNotFound;
00406     <span class="keywordflow">while</span>(pgm_read_byte(ptr)) cmdlineOutputFunc( pgm_read_byte(ptr++) );
00407 
00408     cmdlineOutputFunc(<span class="charliteral">'\r'</span>);
00409     cmdlineOutputFunc(<span class="charliteral">'\n'</span>);
00410 }
00411 
00412 <span class="comment">// argument retrieval commands</span>
00413 
00414 <span class="comment">// return string pointer to argument [argnum]</span>
<a name="l00415"></a><a class="code" href="group__cmdline.html#ga11">00415</a> u08* <a class="code" href="group__cmdline.html#ga11">cmdlineGetArgStr</a>(u08 argnum)
00416 {
00417     <span class="comment">// find the offset of argument number [argnum]</span>
00418     u08 idx=0;
00419     u08 arg;
00420     
00421     <span class="comment">// find the first non-whitespace character</span>
00422     <span class="keywordflow">while</span>( (CmdlineBuffer[idx] != 0) &amp;&amp; (CmdlineBuffer[idx] == <span class="charliteral">' '</span>)) idx++;
00423     
00424     <span class="comment">// we are at the first argument</span>
00425     <span class="keywordflow">for</span>(arg=0; arg&lt;argnum; arg++)
00426     {
00427         <span class="comment">// find the next whitespace character</span>
00428         <span class="keywordflow">while</span>( (CmdlineBuffer[idx] != 0) &amp;&amp; (CmdlineBuffer[idx] != <span class="charliteral">' '</span>)) idx++;
00429         <span class="comment">// find the first non-whitespace character</span>
00430         <span class="keywordflow">while</span>( (CmdlineBuffer[idx] != 0) &amp;&amp; (CmdlineBuffer[idx] == <span class="charliteral">' '</span>)) idx++;
00431     }
00432     <span class="comment">// we are at the requested argument or the end of the buffer</span>
00433     <span class="keywordflow">return</span> &amp;CmdlineBuffer[idx];
00434 }
00435 
00436 <span class="comment">// return argument [argnum] interpreted as a decimal integer</span>
<a name="l00437"></a><a class="code" href="group__cmdline.html#ga12">00437</a> <span class="keywordtype">long</span> <a class="code" href="group__cmdline.html#ga12">cmdlineGetArgInt</a>(u08 argnum)
00438 {
00439     <span class="keywordtype">char</span>* endptr;
00440     <span class="keywordflow">return</span> strtol(<a class="code" href="group__cmdline.html#ga11">cmdlineGetArgStr</a>(argnum), &amp;endptr, 10);
00441 }
00442 
00443 <span class="comment">// return argument [argnum] interpreted as a hex integer</span>
<a name="l00444"></a><a class="code" href="group__cmdline.html#ga13">00444</a> <span class="keywordtype">long</span> <a class="code" href="group__cmdline.html#ga13">cmdlineGetArgHex</a>(u08 argnum)
00445 {
00446     <span class="keywordtype">char</span>* endptr;
00447     <span class="keywordflow">return</span> strtol(<a class="code" href="group__cmdline.html#ga11">cmdlineGetArgStr</a>(argnum), &amp;endptr, 16);
00448 }
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