test_src/cli.c

   1 /* cli.c */
   2 /*
   3     This file is part of the AVR-Crypto-Lib.
   4     Copyright (C) 2008  Daniel Otte (daniel.otte@rub.de)
   5
   6     This program is free software: you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation, either version 3 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19 /**
  20  *
  21  * author: Daniel Otte
  22  * email:  daniel.otte@rub.de
  23  * license: GPLv3 or later
  24  *
  25  * components to help implementing simple command based interaction
  26  *
  27  **/
  28
  29 #include <stdlib.h>
  30 #include <stdint.h>
  31 #include <ctype.h>
  32 #include <string.h>
  33 #include <avr/pgmspace.h>
  34 #include "string-extras.h"
  35 #include "cli.h"
  36 #include "config.h"
  37 #include "hexdigit_tab.h"
  38
  39 cli_rx_fpt cli_rx = NULL;
  40 cli_tx_fpt cli_tx = NULL;
  41 uint8_t cli_echo=1;
  42
  43 /**
  44  * \brief output a character to the console
  45  *
  46  */
  47
  48 void cli_putc(char c){
  49         if(cli_tx)
  50                 cli_tx(c);
  51 }
  52
  53 /**
  54  * \brief get a character from the console
  55  * Gets a character from the console input and blocks
  56  * until a character is recieved
  57  */
  58 uint16_t cli_getc(void){
  59         if(cli_rx)
  60                 return cli_rx();
  61         return ((uint16_t)-1);
  62 }
  63
  64 /**
  65  * \brief get a character from the console
  66  * Gets a char from the console input (like cli_getc())
  67  * and echos it back to the console if echo is enabled.
  68  */
  69 uint16_t cli_getc_cecho(void){
  70         char c;
  71         if(cli_rx){
  72                 c = cli_rx();
  73                 if(cli_tx && cli_echo)
  74                         cli_tx(c);
  75                 return c;
  76         }
  77         return ((uint16_t)-1);
  78 }
  79
  80 /**
  81  * \brief ouputs a zero-terminated string from ram to the console
  82  */
  83 void cli_putstr(char* s){
  84         if(!cli_tx)
  85                 return;
  86         while(*s)
  87                 cli_tx(*s++);
  88 }
  89
  90
  91 /**
  92  * \brief ouputs a zero-terminated string from flash to the console
  93  */
  94 void cli_putstr_P(PGM_P s){
  95         char c;
  96         if(!cli_tx)
  97                 return;
  98         for(;;){
  99                 c = pgm_read_byte(s++);
 100                 if(!c)
 101                         return;
 102                 cli_tx(c);
 103         }
 104 }
 105
 106 /**
 107  * \brief reads a line or max n characters from the console
 108  * Writes characters from the console into the supplyed buffer until a '\r'
 109  * character is recieved or until n character a read (whatever happens first).
 110  * The string will always be terminated by a '\0' character, so the buffer
 111  * should have at least a size of n+1.
 112  */
 113 uint8_t cli_getsn(char* s, uint16_t n){
 114         char c;
 115         if(n==0)
 116                 return 2;
 117         while((c=cli_getc_cecho())!='\0' && c!='\r' && n--){
 118                 *s++=c;
 119         }
 120         *s='\0';
 121         return (c=='\r')?0:1;
 122 }
 123
 124 /**
 125  * \brief dumps the contents of a buffer to the console
 126  * Dumps length bytes from data to the console ouput. The dump
 127  * will have 2*n continous hexadecimal characters.
 128  */
 129 void cli_hexdump(void* data, uint16_t length){
 130         if(!cli_tx)
 131                 return;
 132         while(length--){
 133                 cli_tx(pgm_read_byte(hexdigit_tab_P +((*((uint8_t*)data))>>4)));
 134                 cli_tx(pgm_read_byte(hexdigit_tab_P +((*((uint8_t*)data))&0xf)));
 135                 data = (uint8_t*)data +1;
 136         }
 137 }
 138
 139 /**
 140  * \brief dumps the contents of a buffer to the console
 141  * This function behaves like cli_hexdump except that the
 142  * bytes are dumped in reverse order. This is usefull to dump
 143  * integers which ar e in little endian order.
 144  */
 145 void cli_hexdump_rev(void* data, uint16_t length){
 146         if(!cli_tx)
 147                 return;
 148         data = (uint8_t*)data + length -1;
 149         while(length--){
 150                 cli_tx(pgm_read_byte(hexdigit_tab_P +((*((uint8_t*)data))>>4)));
 151                 cli_tx(pgm_read_byte(hexdigit_tab_P +((*((uint8_t*)data))&0xf)));
 152                 data = (uint8_t*)data -1;
 153         }
 154 }
 155
 156 /**
 157  * \brief dumps the contents of a buffer to the console
 158  * Like cli_hexdump but bytes are seperated with a single space
 159  * on the console output.
 160  */
 161 void cli_hexdump2(void* data, uint16_t length){
 162         if(!cli_tx)
 163                 return;
 164         while(length--){
 165                 cli_tx(pgm_read_byte(hexdigit_tab_P +((*((uint8_t*)data))>>4)));
 166                 cli_tx(pgm_read_byte(hexdigit_tab_P +((*((uint8_t*)data))&0xf)));
 167                 cli_tx(' ');
 168                 data = (uint8_t*)data +1;
 169         }
 170 }
 171
 172
 173 static
 174 void cli_auto_help(uint16_t maxcmdlength, PGM_VOID_P cmdlist){
 175         cmdlist_entry_t item;
 176         uint16_t i;
 177         if(!cli_tx)
 178                 return;
 179
 180         cli_putstr_P(PSTR("\r\n[auto help] available commands:\r\n"
 181                           " <command> - <params> - <address>\r\n"));
 182         for(;;){
 183                 item.cmd_name      = (void*)pgm_read_word(cmdlist+0);
 184                 item.cmd_param_str = (void*)pgm_read_word(cmdlist+2);
 185                 item.cmd_function  = (void_fpt)pgm_read_word(cmdlist+4);
 186                 cmdlist = (uint8_t*)cmdlist+CMDLIST_ENTRY_SIZE;
 187                 if(item.cmd_name==NULL){
 188                         return;
 189                 }
 190                 cli_tx(' ');
 191                 cli_putstr_P(item.cmd_name);
 192                 i=maxcmdlength-strlen_P(item.cmd_name);
 193                 while(i--)
 194                         cli_tx(' ');
 195                 cli_putstr_P(PSTR(" - "));
 196                 if(item.cmd_param_str==NULL){
 197                         cli_putstr_P(PSTR("none \t- 0x"));
 198                 } else {
 199                         if(item.cmd_param_str==(void*)1){
 200                                 cli_putstr_P(PSTR("yes  \t- 0x"));
 201                         } else {
 202                                 cli_putstr_P(item.cmd_param_str);
 203                                 cli_putstr_P(PSTR(" \t- 0x"));
 204                         }
 205                 }
 206                 cli_hexdump_rev(&item.cmd_function, 2);
 207                 cli_putstr_P(PSTR("\r\n"));
 208         }
 209 }
 210
 211 void echo_ctrl(char* s){
 212         s = strstrip(s);
 213         if(s==NULL || *s=='\0'){
 214                 cli_putstr_P(PSTR("\r\necho is "));
 215                 cli_putstr_P(cli_echo?PSTR("on"):PSTR("off"));
 216                 cli_putstr_P(PSTR("\r\n"));
 217         }
 218         strlwr(s);
 219         if(!strcmp_P(s, PSTR("true")) || !strcmp_P(s, PSTR("on")) || *s=='1'){
 220                 cli_echo=1;
 221         }
 222         if(!strcmp_P(s, PSTR("false")) || !strcmp_P(s, PSTR("off")) || *s=='0'){
 223                 cli_echo=0;
 224         }
 225 }
 226
 227 typedef void(*str_fpt)(char*);
 228 #define CLI_ENTER     13
 229 #define CLI_BACKSPACE  8
 230 #define CLI_TABULATOR  9
 231
 232 int8_t search_and_call(char* cmd, uint16_t maxcmdlength, PGM_VOID_P cmdlist){
 233         PGM_VOID_P cmdlist_orig = cmdlist;
 234         if(*cmd=='\0' || *cmd=='#')
 235                 return 1;
 236         if(!strcmp_P(cmd, PSTR("exit")))
 237                 return 0;
 238         if((!strcmp_P(cmd, PSTR("help"))) || (!strcmp_P(cmd, PSTR("?")))){
 239                 cli_auto_help(maxcmdlength, cmdlist);
 240                 return 1;
 241         }
 242         uint16_t fwlength=firstword_length(cmd);
 243         char fw[fwlength+1];
 244         memcpy(fw, cmd, fwlength);
 245         fw[fwlength] = '\0';
 246         cmdlist_entry_t item;
 247         do{
 248                 item.cmd_name =      (void*)pgm_read_word(cmdlist+0);
 249                 item.cmd_param_str = (void*)pgm_read_word(cmdlist+2);
 250                 item.cmd_function =  (void_fpt)pgm_read_word(cmdlist+4);
 251                 cmdlist = (uint8_t*)cmdlist+CMDLIST_ENTRY_SIZE;
 252         }while(item.cmd_name!=NULL && strcmp_P(fw, item.cmd_name));
 253         if(item.cmd_name==NULL){
 254                 cli_auto_help(maxcmdlength, cmdlist_orig);
 255         } else {
 256                 if(item.cmd_function==NULL)
 257                         return 2;
 258                 switch((uint16_t)item.cmd_param_str){
 259                         case 0:
 260                                 item.cmd_function();
 261                                 break;
 262                         case 1:
 263                                 if(cmd[fwlength]=='\0'){
 264                                         ((str_fpt)item.cmd_function)(cmd+fwlength);
 265                                 } else {
 266                                         ((str_fpt)item.cmd_function)(cmd+fwlength+1);
 267                                 }
 268                                 break;
 269                         default:
 270                                 cli_putstr_P(PSTR("\r\nparam parsing currently not implemented!\r\n"));
 271                                 break;
 272                 }
 273
 274         }
 275         return 1;
 276 }
 277
 278 uint16_t max_cmd_length(PGM_VOID_P cmdlist){
 279         uint16_t t,ret=0;
 280         char* str;
 281         for(;;){
 282                 str = (char*)pgm_read_word(cmdlist);
 283                 cmdlist = (uint8_t*)cmdlist + CMDLIST_ENTRY_SIZE;
 284                 if(str==NULL)
 285                         return ret;
 286                 t = strlen_P(str);
 287                 if(t>ret)
 288                         ret=t;
 289         }
 290 }
 291
 292 uint8_t cli_completion(char* buffer, uint16_t maxcmdlength, PGM_VOID_P cmdlist){
 293         uint8_t i=0;
 294         char ref[maxcmdlength+1];
 295         char* itemstr;
 296         ref[0]='\0';
 297         /* check if we are behind the first word */
 298         while(buffer[i]){
 299                 if(!isgraph(buffer[i++]))
 300                         return 0;
 301         }
 302         for(;;){
 303                 itemstr = (char*)pgm_read_word(cmdlist);
 304                 if(itemstr==NULL)
 305                         break;
 306                 cmdlist = (uint8_t*)cmdlist +CMDLIST_ENTRY_SIZE;
 307                 if(!strncmp_P(buffer, itemstr, i)){
 308                         if(!ref[0]){
 309                                 strcpy_P(ref, itemstr);
 310                         }else{
 311                                 ref[stridentcnt_P(ref, itemstr)]='\0';
 312                         }
 313                 }
 314         }
 315         i = strcmp(buffer, ref);
 316         if(i)
 317                 strcpy(buffer, ref);
 318         return ~i;
 319 }
 320
 321 void cli_option_listing(char* buffer, PGM_VOID_P cmdlist){
 322         char* itemstr;
 323         uint16_t len=strlen(buffer);
 324         for(;;){
 325                 itemstr = (char*)pgm_read_word(cmdlist);
 326                 if(itemstr==NULL){
 327                         cli_putstr_P(PSTR("\r\n>"));
 328                         cli_putstr(buffer);
 329                         return;
 330                 }
 331                 cmdlist = (uint8_t*)cmdlist +CMDLIST_ENTRY_SIZE;
 332                 if(!strncmp_P(buffer, itemstr, len)){
 333                         cli_putstr_P(PSTR("\r\n    "));
 334                         cli_putstr_P(itemstr);
 335                 }
 336         }
 337 }
 338
 339 int8_t cmd_interface(PGM_VOID_P cmd_desc){
 340         uint16_t cli_buffer_size;
 341         uint16_t cli_buffer_index;
 342         int8_t exit_code;
 343         uint8_t completion_failed=0;
 344         char* cli_buffer;
 345         char c;
 346         uint16_t maxcmdlength = max_cmd_length(cmd_desc);
 347         cli_buffer = calloc(1,cli_buffer_size=maxcmdlength+2);
 348         cli_buffer_index=0;
 349         if(!cli_rx)
 350                 return -1;
 351         if(cli_tx)
 352                 cli_tx('>');
 353         for(;;){
 354                 c = cli_rx();
 355                 switch (c){
 356                 case CLI_ENTER:
 357                         if((exit_code=search_and_call(cli_buffer, maxcmdlength, cmd_desc))<=0){
 358                                 free(cli_buffer);
 359                                 return exit_code;
 360                         }
 361                         memset(cli_buffer, 0, cli_buffer_size);
 362                         cli_buffer_index=0;
 363                         cli_putstr_P(PSTR("\r\n>"));
 364                         completion_failed=0;
 365                         break;
 366                 case CLI_BACKSPACE:
 367                         completion_failed=0;
 368                         if(cli_buffer_index==0)
 369                                 break;
 370                         cli_buffer_index--;
 371                         cli_buffer[cli_buffer_index] = '\0';
 372                         if(cli_echo && cli_tx){
 373                                 cli_tx(c);
 374                         }
 375                         break;
 376                 case CLI_TABULATOR:
 377                         if(completion_failed || cli_buffer_index==0){
 378                                 if(cli_tx)
 379                                         cli_option_listing(cli_buffer, cmd_desc);
 380                         } else {
 381                                 uint16_t old_idx = cli_buffer_index;
 382                                 completion_failed =
 383                                         ~cli_completion(cli_buffer, maxcmdlength, cmd_desc);
 384                                 cli_buffer_index = strlen(cli_buffer);
 385                                 if(cli_echo && cli_tx){
 386                                         while(old_idx<cli_buffer_index){
 387                                                 cli_tx(cli_buffer[old_idx++]);
 388                                         }
 389                                 }
 390                         }
 391                         break;
 392                 default:
 393                         completion_failed=0;
 394                         if(cli_echo && cli_tx){
 395                                 cli_tx(c);
 396                         }
 397                         if(cli_buffer_index+1==cli_buffer_size){
 398                                 cli_buffer = realloc(cli_buffer, cli_buffer_size+=CLI_BUFFER_BS);
 399                                 if(!cli_buffer){
 400                                         return -2;
 401                                 }
 402                                 memset(cli_buffer+cli_buffer_index+1, 0, CLI_BUFFER_BS);
 403                         }
 404                         cli_buffer[cli_buffer_index++] = c;
 405                 }
 406         }
 407 }