cmdline_8c-source.html

avr cpu 库源代码 对avr单片机编程很有帮助

00224         cmdlineOutputFunc(ASCII_CR);
00225         cmdlineOutputFunc(ASCII_LF);
00226         <span class="comment">// add null termination to command</span>
00227         CmdlineBuffer[CmdlineBufferLength++] = 0;
00228         CmdlineBufferEditPos++;
00229         <span class="comment">// command is complete, process it</span>
00230         cmdlineProcessInputString();
00231         <span class="comment">// reset buffer</span>
00232         CmdlineBufferLength = 0;
00233         CmdlineBufferEditPos = 0;
00234     }
00235     <span class="keywordflow">else</span> <span class="keywordflow">if</span>(c == ASCII_BS)
00236     {
00237         <span class="keywordflow">if</span>(CmdlineBufferEditPos)
00238         {
00239             <span class="comment">// is this a simple delete (off the end of the line)</span>
00240             <span class="keywordflow">if</span>(CmdlineBufferEditPos == CmdlineBufferLength)
00241             {
00242                 <span class="comment">// destructive backspace</span>
00243                 <span class="comment">// echo backspace-space-backspace</span>
00244                 cmdlineOutputFunc(ASCII_BS);
00245                 cmdlineOutputFunc(<span class="charliteral">' '</span>);
00246                 cmdlineOutputFunc(ASCII_BS);
00247                 <span class="comment">// decrement our buffer length and edit position</span>
00248                 CmdlineBufferLength--;
00249                 CmdlineBufferEditPos--;
00250             }
00251             <span class="keywordflow">else</span>
00252             {
00253                 <span class="comment">// edit/cursor position != end of buffer</span>
00254                 <span class="comment">// we're deleting characters at a mid-line edit position</span>
00255                 <span class="comment">// shift characters down, effectively deleting</span>
00256                 CmdlineBufferLength--;
00257                 CmdlineBufferEditPos--;
00258                 <span class="keywordflow">for</span>(i=CmdlineBufferEditPos; i&lt;CmdlineBufferLength; i++)
00259                     CmdlineBuffer[i] = CmdlineBuffer[i+1];
00260                 <span class="comment">// repaint</span>
00261                 cmdlineRepaint();
00262                 <span class="comment">// add space to clear leftover characters</span>
00263                 cmdlineOutputFunc(<span class="charliteral">' '</span>);
00264                 <span class="comment">// reposition cursor</span>
00265                 <span class="keywordflow">for</span>(i=CmdlineBufferEditPos; i&lt;(CmdlineBufferLength+1); i++)
00266                     cmdlineOutputFunc(ASCII_BS);
00267             }
00268         }
00269         <span class="keywordflow">else</span>
00270         {
00271             <span class="comment">// else, ring the bell</span>
00272             cmdlineOutputFunc(ASCII_BEL);
00273         }
00274     }
00275     <span class="keywordflow">else</span> <span class="keywordflow">if</span>(c == ASCII_DEL)
00276     {
00277         <span class="comment">// not yet handled</span>
00278     }
00279     <span class="keywordflow">else</span> <span class="keywordflow">if</span>(c == ASCII_ESC)
00280     {
00281         CmdlineInputVT100State = 1;
00282     }
00283 }
00284 
00285 <span class="keywordtype">void</span> cmdlineRepaint(<span class="keywordtype">void</span>)
00286 {
00287     u08* ptr;
00288     u08 i;
00289 
00290     <span class="comment">// carriage return</span>
00291     cmdlineOutputFunc(ASCII_CR);
00292     <span class="comment">// print fresh prompt</span>
00293     cmdlinePrintPrompt();
00294     <span class="comment">// print the new command line buffer</span>
00295     i = CmdlineBufferLength;
00296     ptr = CmdlineBuffer;
00297     <span class="keywordflow">while</span>(i--) cmdlineOutputFunc(*ptr++);
00298 }
00299 
00300 <span class="keywordtype">void</span> cmdlineDoHistory(u08 action)
00301 {
00302     <span class="keywordflow">switch</span>(action)
00303     {
00304     <span class="keywordflow">case</span> CMDLINE_HISTORY_SAVE:
00305         <span class="comment">// copy CmdlineBuffer to history if not null string</span>
00306         <span class="keywordflow">if</span>( strlen(CmdlineBuffer) )
00307             strcpy(CmdlineHistory[0], CmdlineBuffer);
00308         <span class="keywordflow">break</span>;
00309     <span class="keywordflow">case</span> CMDLINE_HISTORY_PREV:
00310         <span class="comment">// copy history to current buffer</span>
00311         strcpy(CmdlineBuffer, CmdlineHistory[0]);
00312         <span class="comment">// set the buffer position to the end of the line</span>
00313         CmdlineBufferLength = strlen(CmdlineBuffer);
00314         CmdlineBufferEditPos = CmdlineBufferLength;
00315         <span class="comment">// "re-paint" line</span>
00316         cmdlineRepaint();
00317         <span class="keywordflow">break</span>;
00318     <span class="keywordflow">case</span> CMDLINE_HISTORY_NEXT:
00319         <span class="keywordflow">break</span>;
00320     }
00321 }
00322 
00323 <span class="keywordtype">void</span> cmdlineProcessInputString(<span class="keywordtype">void</span>)
00324 {
00325     u08 cmdIndex;
00326     u08 i=0;
00327 
00328     <span class="comment">// save command in history</span>
00329     cmdlineDoHistory(CMDLINE_HISTORY_SAVE);
00330 
00331     <span class="comment">// find the end of the command (excluding arguments)</span>
00332     <span class="comment">// find first whitespace character in CmdlineBuffer</span>
00333     <span class="keywordflow">while</span>( !((CmdlineBuffer[i] == <span class="charliteral">' '</span>) || (CmdlineBuffer[i] == 0)) ) i++;
00334 
00335     <span class="keywordflow">if</span>(!i)
00336     {
00337         <span class="comment">// command was null or empty</span>
00338         <span class="comment">// output a new prompt</span>
00339         cmdlinePrintPrompt();
00340         <span class="comment">// we're done</span>
00341         <span class="keywordflow">return</span>;
00342     }
00343 
00344     <span class="comment">// search command list for match with entered command</span>
00345     <span class="keywordflow">for</span>(cmdIndex=0; cmdIndex&lt;CmdlineNumCommands; cmdIndex++)
00346     {
00347         <span class="keywordflow">if</span>( !strncmp(CmdlineCommandList[cmdIndex], CmdlineBuffer, i) )
00348         {
00349             <span class="comment">// user-entered command matched a command in the list (database)</span>
00350             <span class="comment">// run the corresponding function</span>
00351             CmdlineExecFunction = CmdlineFunctionList[cmdIndex];
00352             <span class="comment">// new prompt will be output after user function runs</span>
00353             <span class="comment">// and we're done</span>
00354             <span class="keywordflow">return</span>;
00355         }
00356     }
00357 
00358     <span class="comment">// if we did not get a match</span>
00359     <span class="comment">// output an error message</span>
00360     cmdlinePrintError();
00361     <span class="comment">// output a new prompt</span>
00362     cmdlinePrintPrompt();
00363 }
00364 
<a name="l00365"></a><a class="code" href="group__cmdline.html#ga5">00365</a> <span class="keywordtype">void</span> <a class="code" href="group__cmdline.html#ga5">cmdlineMainLoop</a>(<span class="keywordtype">void</span>)
00366 {
00367     <span class="comment">// do we have a command/function to be executed</span>
00368     <span class="keywordflow">if</span>(CmdlineExecFunction)
00369     {
00370         <span class="comment">// run it</span>
00371         CmdlineExecFunction();
00372         <span class="comment">// reset</span>
00373         CmdlineExecFunction = 0;
00374         <span class="comment">// output new prompt</span>
00375         cmdlinePrintPrompt();
00376     }
00377 }
00378 
00379 <span class="keywordtype">void</span> cmdlinePrintPrompt(<span class="keywordtype">void</span>)
00380 {
00381     <span class="comment">// print a new command prompt</span>
00382     u08* ptr = CmdlinePrompt;
00383     <span class="keywordflow">while</span>(pgm_read_byte(ptr)) cmdlineOutputFunc( pgm_read_byte(ptr++) );
00384 }
00385 
00386 <span class="keywordtype">void</span> cmdlinePrintError(<span class="keywordtype">void</span>)
00387 {
00388     u08 * ptr;
00389 
00390     <span class="comment">// print a notice header</span>
00391     <span class="comment">// (u08*) cast used to avoid compiler warning</span>
00392     ptr = (u08*)CmdlineNotice;
00393     <span class="keywordflow">while</span>(pgm_read_byte(ptr)) cmdlineOutputFunc( pgm_read_byte(ptr++) );
00394     
00395     <span class="comment">// print the offending command</span>
00396     ptr = CmdlineBuffer;
00397     <span class="keywordflow">while</span>((*ptr) &amp;&amp; (*ptr != <span class="charliteral">' '</span>)) cmdlineOutputFunc(*ptr++);
00398 
00399     cmdlineOutputFunc(<span class="charliteral">':'</span>);
00400     cmdlineOutputFunc(<span class="charliteral">' '</span>);
00401 
00402     <span class="comment">// print the not-found message</span>
00403     <span class="comment">// (u08*) cast used to avoid compiler warning</span>
00404     ptr = (u08*)CmdlineCmdNotFound;
00405     <span class="keywordflow">while</span>(pgm_read_byte(ptr)) cmdlineOutputFunc( pgm_read_byte(ptr++) );
00406 
00407     cmdlineOutputFunc(<span class="charliteral">'\r'</span>);
00408     cmdlineOutputFunc(<span class="charliteral">'\n'</span>);
00409 }
00410 
00411 <span class="comment">// argument retrieval commands</span>
00412 
00413 <span class="comment">// return string pointer to argument [argnum]</span>
<a name="l00414"></a><a class="code" href="group__cmdline.html#ga11">00414</a> u08* <a class="code" href="group__cmdline.html#ga11">cmdlineGetArgStr</a>(u08 argnum)
00415 {
00416     <span class="comment">// find the offset of argument number [argnum]</span>
00417     u08 idx=0;
00418     u08 arg;
00419     
00420     <span class="comment">// find the first non-whitespace character</span>
00421     <span class="keywordflow">while</span>( (CmdlineBuffer[idx] != 0) &amp;&amp; (CmdlineBuffer[idx] == <span class="charliteral">' '</span>)) idx++;
00422     
00423     <span class="comment">// we are at the first argument</span>
00424     <span class="keywordflow">for</span>(arg=0; arg&lt;argnum; arg++)
00425     {
00426         <span class="comment">// find the next whitespace character</span>
00427         <span class="keywordflow">while</span>( (CmdlineBuffer[idx] != 0) &amp;&amp; (CmdlineBuffer[idx] != <span class="charliteral">' '</span>)) idx++;
00428         <span class="comment">// find the first non-whitespace character</span>
00429         <span class="keywordflow">while</span>( (CmdlineBuffer[idx] != 0) &amp;&amp; (CmdlineBuffer[idx] == <span class="charliteral">' '</span>)) idx++;
00430     }
00431     <span class="comment">// we are at the requested argument or the end of the buffer</span>
00432     <span class="keywordflow">return</span> &amp;CmdlineBuffer[idx];
00433 }
00434 
00435 <span class="comment">// return argument [argnum] interpreted as a decimal integer</span>
<a name="l00436"></a><a class="code" href="group__cmdline.html#ga12">00436</a> <span class="keywordtype">long</span> <a class="code" href="group__cmdline.html#ga12">cmdlineGetArgInt</a>(u08 argnum)
00437 {
00438     <span class="keywordtype">char</span>* endptr;
00439     <span class="keywordflow">return</span> strtol(<a class="code" href="group__cmdline.html#ga11">cmdlineGetArgStr</a>(argnum), &amp;endptr, 10);
00440 }
00441 
00442 <span class="comment">// return argument [argnum] interpreted as a hex integer</span>
<a name="l00443"></a><a class="code" href="group__cmdline.html#ga13">00443</a> <span class="keywordtype">long</span> <a class="code" href="group__cmdline.html#ga13">cmdlineGetArgHex</a>(u08 argnum)
00444 {
00445     <span class="keywordtype">char</span>* endptr;
00446     <span class="keywordflow">return</span> strtol(<a class="code" href="group__cmdline.html#ga11">cmdlineGetArgStr</a>(argnum), &amp;endptr, 16);
00447 }
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