test_src/cli.c

   1 /* cli.c */
   2 /*
   3     This file is part of the ARM-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 "string-extras.h"
  34 #include "cli.h"
  35 #include "hexdigit_tab.h"
  36
  37 #ifndef MAX
  38 #define MAX(a,b) ((a>b)?(a):(b))
  39 #endif
  40
  41
  42 cli_rx_fpt cli_rx = NULL;
  43 cli_tx_fpt cli_tx = NULL;
  44 uint8_t cli_echo=1;
  45
  46 /**
  47  * \brief output a character to the console
  48  *
  49  */
  50
  51 void cli_putc(char c){
  52         if(cli_tx)
  53                 cli_tx(c);
  54 }
  55
  56 /**
  57  * \brief get a character from the console
  58  * Gets a character from the console input and blocks
  59  * until a character is recieved
  60  */
  61 uint16_t cli_getc(void){
  62         if(cli_rx)
  63                 return cli_rx();
  64         return ((uint16_t)-1);
  65 }
  66
  67 /**
  68  * \brief get a character from the console
  69  * Gets a char from the console input (like cli_getc())
  70  * and echos it back to the console if echo is enabled.
  71  */
  72 uint16_t cli_getc_cecho(void){
  73         char c;
  74         if(cli_rx){
  75                 c = cli_rx();
  76                 if(cli_tx && cli_echo)
  77                         cli_tx(c);
  78                 return c;
  79         }
  80         return ((uint16_t)-1);
  81 }
  82
  83 /**
  84  * \brief ouputs a zero-terminated string from ram to the console
  85  */
  86 void cli_putstr(const char* s){
  87         if(!cli_tx)
  88                 return;
  89         while(*s)
  90                 cli_tx(*s++);
  91 }
  92
  93
  94 /**
  95  * \brief reads a line or max n characters from the console
  96  * Writes characters from the console into the supplyed buffer until a '\r'
  97  * character is recieved or until n character a read (whatever happens first).
  98  * The string will always be terminated by a '\0' character, so the buffer
  99  * should have at least a size of n+1.
 100  */
 101 uint8_t cli_getsn(char* s, uint32_t n){
 102         char c;
 103         if(n==0)
 104                 return 2;
 105         while((c=cli_getc_cecho())!='\0' && c!='\r' && n--){
 106                 *s++=c;
 107         }
 108         *s='\0';
 109         return (c=='\r')?0:1;
 110 }
 111
 112 void cli_hexdump_byte(uint8_t byte){
 113         cli_tx(hexdigit_tab[byte>>4]);
 114         cli_tx(hexdigit_tab[byte & 0xf]);
 115 }
 116
 117 /**
 118  * \brief dumps the contents of a buffer to the console
 119  * Dumps length bytes from data to the console output. The dump
 120  * will have 2*n continuous hexadecimal characters.
 121  */
 122 void cli_hexdump(const void* data, uint32_t length){
 123         if(!cli_tx)
 124                 return;
 125         while(length--){
 126                 cli_hexdump_byte(*((uint8_t*)data));
 127                 data = (uint8_t*)data +1;
 128         }
 129 }
 130
 131 /**
 132  * \brief dumps the contents of a buffer to the console
 133  * This function behaves like cli_hexdump except that the
 134  * bytes are dumped in reverse order. This is useful to dump
 135  * integers which are in little endian order.
 136  */
 137 void cli_hexdump_rev(const void* data, uint32_t length){
 138         if(!cli_tx)
 139                 return;
 140         data = (uint8_t*)data + length -1;
 141         while(length--){
 142                 cli_hexdump_byte(*((uint8_t*)data));
 143                 data = (uint8_t*)data -1;
 144         }
 145 }
 146
 147 /**
 148  * \brief dumps the contents of a buffer to the console
 149  * Like cli_hexdump but bytes are seperated with a single space
 150  * on the console output.
 151  */
 152 void cli_hexdump2(const void* data, uint32_t length){
 153         if(!cli_tx)
 154                 return;
 155         while(length--){
 156                 cli_hexdump_byte(*((uint8_t*)data));
 157                 cli_tx(' ');
 158                 data = (uint8_t*)data +1;
 159         }
 160 }
 161
 162 /**
 163  * \brief dumps the contents of a buffer to the console
 164  * Like cli_hexdump but bytes are separated with a single space
 165  * on the console output.
 166  */
 167 void cli_hexdump_block(const void* data, uint32_t length, uint8_t indent, uint8_t width){
 168         uint16_t i;
 169         uint8_t  j;
 170         if(!cli_tx)
 171                 return;
 172         for(i=0; i<length; ++i){
 173                 if(i%width==0){
 174                         cli_putstr("\r\n");
 175                         for(j=0; j<indent; ++j){
 176                                 cli_tx(' ');
 177                         }
 178                 }
 179                 cli_hexdump_byte(*((uint8_t*)data));
 180                 cli_tx(' ');
 181                 data = (uint8_t*)data +1;
 182         }
 183 }
 184
 185 static
 186 void cli_auto_help(uint32_t maxcmdlength, const cmdlist_entry_t* cmdlist){
 187         cmdlist_entry_t item;
 188         uint16_t i;
 189         if(!cli_tx)
 190                 return;
 191
 192         cli_putstr("\r\n[auto help] available commands:\r\n"
 193                           " <command> - <params> - <address>\r\n");
 194         for(;;){
 195                 memcpy(&item, cmdlist, sizeof(cmdlist_entry_t));
 196                 cmdlist += 1;
 197                 if(item.cmd_name==NULL){
 198                         return;
 199                 }
 200                 cli_tx(' ');
 201                 cli_putstr(item.cmd_name);
 202                 i=MAX(maxcmdlength, strlen("<command>"))-strlen(item.cmd_name);
 203                 while(i--)
 204                         cli_tx(' ');
 205                 cli_putstr(" - ");
 206                 if(item.cmd_param_str==NULL){
 207                         cli_putstr("none \t- 0x");
 208                 } else {
 209                         if(item.cmd_param_str==(void*)1){
 210                                 cli_putstr("yes  \t- 0x");
 211                         } else {
 212                                 cli_putstr(item.cmd_param_str);
 213                                 cli_putstr(" \t- 0x");
 214                         }
 215                 }
 216                 cli_hexdump_rev(&item.cmd_function, sizeof(void*));
 217                 cli_putstr("\r\n");
 218         }
 219 }
 220
 221 void echo_ctrl(char* s){
 222         s = strstrip(s);
 223         if(s==NULL || *s=='\0'){
 224                 cli_putstr("\r\necho is ");
 225                 cli_putstr(cli_echo?"on":"off");
 226                 cli_putstr("\r\n");
 227         }
 228         strlwr(s);
 229         if(!strcmp(s, "true") || !strcmp(s, "on") || *s=='1'){
 230                 cli_echo=1;
 231         }
 232         if(!strcmp(s, "false") || !strcmp(s, "off") || *s=='0'){
 233                 cli_echo=0;
 234         }
 235 }
 236
 237
 238 typedef void(*str_fpt)(char*);
 239 #define CLI_ENTER     13
 240 #define CLI_BACKSPACE  8
 241 #define CLI_TABULATOR  9
 242
 243 static
 244 int8_t search_and_call(char* cmd, uint32_t maxcmdlength, const cmdlist_entry_t* cmdlist){
 245         const cmdlist_entry_t* cmdlist_orig=cmdlist;
 246         if(!cmdlist){
 247                 return 3;
 248         }
 249         if(*cmd=='\0' || *cmd=='#')
 250                 return 1;
 251         if(!strcmp(cmd, "exit"))
 252                 return 0;
 253         if((!strcmp(cmd, "help")) || (!strcmp(cmd, "?"))){
 254                 cli_auto_help(maxcmdlength, cmdlist);
 255                 return 1;
 256         }
 257         uint16_t fwlength=firstword_length(cmd);
 258         char fw[fwlength+1];
 259         memcpy(fw, cmd, fwlength);
 260         fw[fwlength] = '\0';
 261         cmdlist_entry_t item;
 262         while(cmdlist->cmd_name && strcmp(fw, cmdlist->cmd_name)){
 263                 ++cmdlist;
 264         }
 265         if(!cmdlist->cmd_name){
 266                 cli_auto_help(maxcmdlength, cmdlist_orig);
 267         } else {
 268                 memcpy(&item, cmdlist, sizeof(cmdlist_entry_t));
 269                 switch((uint32_t)item.cmd_param_str){
 270                         case 0:
 271                                 item.cmd_function();
 272                                 break;
 273                         case 1:
 274                                 if(cmd[fwlength]=='\0'){
 275                                         ((str_fpt)item.cmd_function)(cmd+fwlength);
 276                                 } else {
 277                                         ((str_fpt)item.cmd_function)(cmd+fwlength+1);
 278                                 }
 279                                 break;
 280                         default:
 281                                 cli_putstr("\r\nparam parsing currently not implemented!\r\n");
 282                                 break;
 283                 }
 284
 285         }
 286         return 1;
 287 }
 288
 289 static
 290 uint16_t max_cmd_length(const cmdlist_entry_t* cmdlist){
 291         uint16_t t,ret=0;
 292         const char* str;
 293         for(;;){
 294                 str = cmdlist->cmd_name;
 295                 ++cmdlist;
 296                 if(str==NULL){
 297                         return ret;
 298                 }
 299                 t = strlen(str);
 300                 if(t>ret){
 301                         ret=t;
 302                 }
 303         }
 304 }
 305
 306 uint8_t cli_completion(char* buffer, uint16_t maxcmdlength, const cmdlist_entry_t* cmdlist){
 307         uint8_t i=0;
 308         char ref[maxcmdlength+1];
 309         const char* itemstr;
 310         ref[0]='\0';
 311         /* check if we are behind the first word */
 312         while(buffer[i]){
 313                 if(!isgraph((uint8_t)(buffer[i++])))
 314                         return 0;
 315         }
 316         for(;;){
 317                 itemstr = cmdlist->cmd_name;
 318                 if(itemstr==NULL)
 319                         break;
 320                 ++cmdlist;
 321                 if(!strncmp(buffer, itemstr, i)){
 322                         if(!ref[0]){
 323                                 strcpy(ref, itemstr);
 324                         }else{
 325                                 ref[stridentcnt(ref, itemstr)]='\0';
 326                         }
 327                 }
 328         }
 329         i = strcmp(buffer, ref);
 330         if(i)
 331                 strcpy(buffer, ref);
 332         return ~i;
 333 }
 334
 335 void cli_option_listing(char* buffer, const cmdlist_entry_t* cmdlist){
 336         const char* itemstr;
 337         uint16_t len=strlen(buffer);
 338         for(;;){
 339                 itemstr = cmdlist->cmd_name;
 340                 if(itemstr==NULL){
 341                         cli_putstr("\r\n>");
 342                         cli_putstr(buffer);
 343                         return;
 344                 }
 345                 cmdlist += 1;
 346                 if(!strncmp(buffer, itemstr, len)){
 347                         cli_putstr("\r\n    ");
 348                         cli_putstr(itemstr);
 349                 }
 350         }
 351 }
 352
 353 int8_t cmd_interface(const cmdlist_entry_t* cmd_desc){
 354         uint16_t cli_buffer_size;
 355         uint16_t cli_buffer_index;
 356         int8_t exit_code;
 357         uint8_t completion_failed=0;
 358         char* cli_buffer;
 359         char c;
 360         uint16_t maxcmdlength = max_cmd_length(cmd_desc);
 361         cli_buffer = calloc(1,cli_buffer_size=maxcmdlength+2);
 362         cli_buffer_index=0;
 363         if(!cli_rx)
 364                 return -1;
 365         if(cli_tx)
 366                 cli_tx('>');
 367         for(;;){
 368                 c = cli_rx();
 369                 switch (c){
 370                 case CLI_ENTER:
 371                         if((exit_code=search_and_call(cli_buffer, maxcmdlength, cmd_desc))<=0){
 372                                 free(cli_buffer);
 373                                 return exit_code;
 374                         }
 375                         memset(cli_buffer, 0, cli_buffer_size);
 376                         cli_buffer_index=0;
 377                         cli_putstr("\r\n>");
 378                         completion_failed=0;
 379                         break;
 380                 case CLI_BACKSPACE:
 381                         completion_failed=0;
 382                         if(cli_buffer_index==0)
 383                                 break;
 384                         cli_buffer_index--;
 385                         cli_buffer[cli_buffer_index] = '\0';
 386                         if(cli_echo && cli_tx){
 387                                 cli_tx(c);
 388                         }
 389                         break;
 390                 case CLI_TABULATOR:
 391                         if(completion_failed || cli_buffer_index==0){
 392                                 if(cli_tx)
 393                                         cli_option_listing(cli_buffer, cmd_desc);
 394                         } else {
 395                                 uint16_t old_idx = cli_buffer_index;
 396                                 completion_failed =
 397                                         ~cli_completion(cli_buffer, maxcmdlength, cmd_desc);
 398                                 cli_buffer_index = strlen(cli_buffer);
 399                                 if(cli_echo && cli_tx){
 400                                         while(old_idx<cli_buffer_index){
 401                                                 cli_tx(cli_buffer[old_idx++]);
 402                                         }
 403                                 }
 404                         }
 405                         break;
 406                 default:
 407                         completion_failed=0;
 408                         if(cli_echo && cli_tx){
 409                                 cli_tx(c);
 410                         }
 411                         if(cli_buffer_index+1==cli_buffer_size){
 412                                 cli_buffer = realloc(cli_buffer, cli_buffer_size+=CLI_BUFFER_BS);
 413                                 if(!cli_buffer){
 414                                         return -2;
 415                                 }
 416                                 memset(cli_buffer+cli_buffer_index+1, 0, CLI_BUFFER_BS);
 417                         }
 418                         cli_buffer[cli_buffer_index++] = c;
 419                 }
 420         }
 421 }
 422