copy_cmd.c

   1 /* copy_command.c -- copy a COMMAND structure.  This is needed
   2    primarily for making function definitions, but I'm not sure
   3    that anyone else will need it.  */
   4
   5 /* Copyright (C) 1987-2009 Free Software Foundation, Inc.
   6
   7    This file is part of GNU Bash, the Bourne Again SHell.
   8
   9    Bash is free software: you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation, either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    Bash is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "config.h"
  24
  25 #include "bashtypes.h"
  26
  27 #if defined (HAVE_UNISTD_H)
  28 #  include <unistd.h>
  29 #endif
  30
  31 #include <stdio.h>
  32
  33 #include "shell.h"
  34
  35 static PATTERN_LIST *copy_case_clause __P((PATTERN_LIST *));
  36 static PATTERN_LIST *copy_case_clauses __P((PATTERN_LIST *));
  37 static FOR_COM *copy_for_command __P((FOR_COM *));
  38 #if defined (ARITH_FOR_COMMAND)
  39 static ARITH_FOR_COM *copy_arith_for_command __P((ARITH_FOR_COM *));
  40 #endif
  41 static GROUP_COM *copy_group_command __P((GROUP_COM *));
  42 static SUBSHELL_COM *copy_subshell_command __P((SUBSHELL_COM *));
  43 static COPROC_COM *copy_coproc_command __P((COPROC_COM *));
  44 static CASE_COM *copy_case_command __P((CASE_COM *));
  45 static WHILE_COM *copy_while_command __P((WHILE_COM *));
  46 static IF_COM *copy_if_command __P((IF_COM *));
  47 #if defined (DPAREN_ARITHMETIC)
  48 static ARITH_COM *copy_arith_command __P((ARITH_COM *));
  49 #endif
  50 #if defined (COND_COMMAND)
  51 static COND_COM *copy_cond_command __P((COND_COM *));
  52 #endif
  53 static SIMPLE_COM *copy_simple_command __P((SIMPLE_COM *));
  54
  55 WORD_DESC *
  56 copy_word (w)
  57      WORD_DESC *w;
  58 {
  59   WORD_DESC *new_word;
  60
  61   new_word = make_bare_word (w->word);
  62   new_word->flags = w->flags;
  63   return (new_word);
  64 }
  65
  66 /* Copy the chain of words in LIST.  Return a pointer to
  67    the new chain. */
  68 WORD_LIST *
  69 copy_word_list (list)
  70      WORD_LIST *list;
  71 {
  72   WORD_LIST *new_list, *tl;
  73
  74   for (new_list = tl = (WORD_LIST *)NULL; list; list = list->next)
  75     {
  76       if (new_list == 0)
  77         new_list = tl = make_word_list (copy_word (list->word), new_list);
  78       else
  79         {
  80           tl->next = make_word_list (copy_word (list->word), (WORD_LIST *)NULL);
  81           tl = tl->next;
  82         }
  83     }
  84
  85   return (new_list);
  86 }
  87
  88 static PATTERN_LIST *
  89 copy_case_clause (clause)
  90      PATTERN_LIST *clause;
  91 {
  92   PATTERN_LIST *new_clause;
  93
  94   new_clause = (PATTERN_LIST *)xmalloc (sizeof (PATTERN_LIST));
  95   new_clause->patterns = copy_word_list (clause->patterns);
  96   new_clause->action = copy_command (clause->action);
  97   new_clause->flags = clause->flags;
  98   return (new_clause);
  99 }
 100
 101 static PATTERN_LIST *
 102 copy_case_clauses (clauses)
 103      PATTERN_LIST *clauses;
 104 {
 105   PATTERN_LIST *new_list, *new_clause;
 106
 107   for (new_list = (PATTERN_LIST *)NULL; clauses; clauses = clauses->next)
 108     {
 109       new_clause = copy_case_clause (clauses);
 110       new_clause->next = new_list;
 111       new_list = new_clause;
 112     }
 113   return (REVERSE_LIST (new_list, PATTERN_LIST *));
 114 }
 115
 116 /* Copy a single redirect. */
 117 REDIRECT *
 118 copy_redirect (redirect)
 119      REDIRECT *redirect;
 120 {
 121   REDIRECT *new_redirect;
 122
 123   new_redirect = (REDIRECT *)xmalloc (sizeof (REDIRECT));
 124 #if 0
 125   FASTCOPY ((char *)redirect, (char *)new_redirect, (sizeof (REDIRECT)));
 126 #else
 127   *new_redirect = *redirect;    /* let the compiler do the fast structure copy */
 128 #endif
 129
 130   if (redirect->rflags & REDIR_VARASSIGN)
 131     new_redirect->redirector.filename = copy_word (redirect->redirector.filename);
 132
 133   switch (redirect->instruction)
 134     {
 135     case r_reading_until:
 136     case r_deblank_reading_until:
 137       new_redirect->here_doc_eof = redirect->here_doc_eof ? savestring (redirect->here_doc_eof) : 0;
 138       /*FALLTHROUGH*/
 139     case r_reading_string:
 140     case r_appending_to:
 141     case r_output_direction:
 142     case r_input_direction:
 143     case r_inputa_direction:
 144     case r_err_and_out:
 145     case r_append_err_and_out:
 146     case r_input_output:
 147     case r_output_force:
 148     case r_duplicating_input_word:
 149     case r_duplicating_output_word:
 150     case r_move_input_word:
 151     case r_move_output_word:
 152       new_redirect->redirectee.filename = copy_word (redirect->redirectee.filename);
 153       break;
 154     case r_duplicating_input:
 155     case r_duplicating_output:
 156     case r_move_input:
 157     case r_move_output:
 158     case r_close_this:
 159       break;
 160     }
 161   return (new_redirect);
 162 }
 163
 164 REDIRECT *
 165 copy_redirects (list)
 166      REDIRECT *list;
 167 {
 168   REDIRECT *new_list, *temp;
 169
 170   for (new_list = (REDIRECT *)NULL; list; list = list->next)
 171     {
 172       temp = copy_redirect (list);
 173       temp->next = new_list;
 174       new_list = temp;
 175     }
 176   return (REVERSE_LIST (new_list, REDIRECT *));
 177 }
 178
 179 static FOR_COM *
 180 copy_for_command (com)
 181      FOR_COM *com;
 182 {
 183   FOR_COM *new_for;
 184
 185   new_for = (FOR_COM *)xmalloc (sizeof (FOR_COM));
 186   new_for->flags = com->flags;
 187   new_for->line = com->line;
 188   new_for->name = copy_word (com->name);
 189   new_for->map_list = copy_word_list (com->map_list);
 190   new_for->action = copy_command (com->action);
 191   return (new_for);
 192 }
 193
 194 #if defined (ARITH_FOR_COMMAND)
 195 static ARITH_FOR_COM *
 196 copy_arith_for_command (com)
 197      ARITH_FOR_COM *com;
 198 {
 199   ARITH_FOR_COM *new_arith_for;
 200
 201   new_arith_for = (ARITH_FOR_COM *)xmalloc (sizeof (ARITH_FOR_COM));
 202   new_arith_for->flags = com->flags;
 203   new_arith_for->line = com->line;
 204   new_arith_for->init = copy_word_list (com->init);
 205   new_arith_for->test = copy_word_list (com->test);
 206   new_arith_for->step = copy_word_list (com->step);
 207   new_arith_for->action = copy_command (com->action);
 208   return (new_arith_for);
 209 }
 210 #endif /* ARITH_FOR_COMMAND */
 211
 212 static GROUP_COM *
 213 copy_group_command (com)
 214      GROUP_COM *com;
 215 {
 216   GROUP_COM *new_group;
 217
 218   new_group = (GROUP_COM *)xmalloc (sizeof (GROUP_COM));
 219   new_group->command = copy_command (com->command);
 220   return (new_group);
 221 }
 222
 223 static SUBSHELL_COM *
 224 copy_subshell_command (com)
 225      SUBSHELL_COM *com;
 226 {
 227   SUBSHELL_COM *new_subshell;
 228
 229   new_subshell = (SUBSHELL_COM *)xmalloc (sizeof (SUBSHELL_COM));
 230   new_subshell->command = copy_command (com->command);
 231   new_subshell->flags = com->flags;
 232   new_subshell->line = com->line;
 233   return (new_subshell);
 234 }
 235
 236 static COPROC_COM *
 237 copy_coproc_command (com)
 238      COPROC_COM *com;
 239 {
 240   COPROC_COM *new_coproc;
 241
 242   new_coproc = (COPROC_COM *)xmalloc (sizeof (COPROC_COM));
 243   new_coproc->name = savestring (com->name);
 244   new_coproc->command = copy_command (com->command);
 245   new_coproc->flags = com->flags;
 246   return (new_coproc);
 247 }
 248
 249 static CASE_COM *
 250 copy_case_command (com)
 251      CASE_COM *com;
 252 {
 253   CASE_COM *new_case;
 254
 255   new_case = (CASE_COM *)xmalloc (sizeof (CASE_COM));
 256   new_case->flags = com->flags;
 257   new_case->line = com->line;
 258   new_case->word = copy_word (com->word);
 259   new_case->clauses = copy_case_clauses (com->clauses);
 260   return (new_case);
 261 }
 262
 263 static WHILE_COM *
 264 copy_while_command (com)
 265      WHILE_COM *com;
 266 {
 267   WHILE_COM *new_while;
 268
 269   new_while = (WHILE_COM *)xmalloc (sizeof (WHILE_COM));
 270   new_while->flags = com->flags;
 271   new_while->test = copy_command (com->test);
 272   new_while->action = copy_command (com->action);
 273   return (new_while);
 274 }
 275
 276 static IF_COM *
 277 copy_if_command (com)
 278      IF_COM *com;
 279 {
 280   IF_COM *new_if;
 281
 282   new_if = (IF_COM *)xmalloc (sizeof (IF_COM));
 283   new_if->flags = com->flags;
 284   new_if->test = copy_command (com->test);
 285   new_if->true_case = copy_command (com->true_case);
 286   new_if->false_case = com->false_case ? copy_command (com->false_case) : com->false_case;
 287   return (new_if);
 288 }
 289
 290 #if defined (DPAREN_ARITHMETIC)
 291 static ARITH_COM *
 292 copy_arith_command (com)
 293      ARITH_COM *com;
 294 {
 295   ARITH_COM *new_arith;
 296
 297   new_arith = (ARITH_COM *)xmalloc (sizeof (ARITH_COM));
 298   new_arith->flags = com->flags;
 299   new_arith->exp = copy_word_list (com->exp);
 300   new_arith->line = com->line;
 301
 302   return (new_arith);
 303 }
 304 #endif
 305
 306 #if defined (COND_COMMAND)
 307 static COND_COM *
 308 copy_cond_command (com)
 309      COND_COM *com;
 310 {
 311   COND_COM *new_cond;
 312
 313   new_cond = (COND_COM *)xmalloc (sizeof (COND_COM));
 314   new_cond->flags = com->flags;
 315   new_cond->line = com->line;
 316   new_cond->type = com->type;
 317   new_cond->op = com->op ? copy_word (com->op) : com->op;
 318   new_cond->left = com->left ? copy_cond_command (com->left) : (COND_COM *)NULL;
 319   new_cond->right = com->right ? copy_cond_command (com->right) : (COND_COM *)NULL;
 320
 321   return (new_cond);
 322 }
 323 #endif
 324
 325 static SIMPLE_COM *
 326 copy_simple_command (com)
 327      SIMPLE_COM *com;
 328 {
 329   SIMPLE_COM *new_simple;
 330
 331   new_simple = (SIMPLE_COM *)xmalloc (sizeof (SIMPLE_COM));
 332   new_simple->flags = com->flags;
 333   new_simple->words = copy_word_list (com->words);
 334   new_simple->redirects = com->redirects ? copy_redirects (com->redirects) : (REDIRECT *)NULL;
 335   new_simple->line = com->line;
 336   return (new_simple);
 337 }
 338
 339 FUNCTION_DEF *
 340 copy_function_def_contents (old, new_def)
 341      FUNCTION_DEF *old, *new_def;
 342 {
 343   new_def->name = copy_word (old->name);
 344   new_def->command = old->command ? copy_command (old->command) : old->command;
 345   new_def->flags = old->flags;
 346   new_def->line = old->line;
 347   new_def->source_file = old->source_file ? savestring (old->source_file) : old->source_file;
 348   return (new_def);
 349 }
 350
 351 FUNCTION_DEF *
 352 copy_function_def (com)
 353      FUNCTION_DEF *com;
 354 {
 355   FUNCTION_DEF *new_def;
 356
 357   new_def = (FUNCTION_DEF *)xmalloc (sizeof (FUNCTION_DEF));
 358   new_def = copy_function_def_contents (com, new_def);
 359   return (new_def);
 360 }
 361
 362 /* Copy the command structure in COMMAND.  Return a pointer to the
 363    copy.  Don't you forget to dispose_command () on this pointer
 364    later! */
 365 COMMAND *
 366 copy_command (command)
 367      COMMAND *command;
 368 {
 369   COMMAND *new_command;
 370
 371   if (command == NULL)
 372     return (command);
 373
 374   new_command = (COMMAND *)xmalloc (sizeof (COMMAND));
 375   FASTCOPY ((char *)command, (char *)new_command, sizeof (COMMAND));
 376   new_command->flags = command->flags;
 377   new_command->line = command->line;
 378
 379   if (command->redirects)
 380     new_command->redirects = copy_redirects (command->redirects);
 381
 382   switch (command->type)
 383     {
 384       case cm_for:
 385         new_command->value.For = copy_for_command (command->value.For);
 386         break;
 387
 388 #if defined (ARITH_FOR_COMMAND)
 389       case cm_arith_for:
 390         new_command->value.ArithFor = copy_arith_for_command (command->value.ArithFor);
 391         break;
 392 #endif
 393
 394 #if defined (SELECT_COMMAND)
 395       case cm_select:
 396         new_command->value.Select =
 397           (SELECT_COM *)copy_for_command ((FOR_COM *)command->value.Select);
 398         break;
 399 #endif
 400
 401       case cm_group:
 402         new_command->value.Group = copy_group_command (command->value.Group);
 403         break;
 404
 405       case cm_subshell:
 406         new_command->value.Subshell = copy_subshell_command (command->value.Subshell);
 407         break;
 408
 409       case cm_coproc:
 410         new_command->value.Coproc = copy_coproc_command (command->value.Coproc);
 411         break;
 412
 413       case cm_case:
 414         new_command->value.Case = copy_case_command (command->value.Case);
 415         break;
 416
 417       case cm_until:
 418       case cm_while:
 419         new_command->value.While = copy_while_command (command->value.While);
 420         break;
 421
 422       case cm_if:
 423         new_command->value.If = copy_if_command (command->value.If);
 424         break;
 425
 426 #if defined (DPAREN_ARITHMETIC)
 427       case cm_arith:
 428         new_command->value.Arith = copy_arith_command (command->value.Arith);
 429         break;
 430 #endif
 431
 432 #if defined (COND_COMMAND)
 433       case cm_cond:
 434         new_command->value.Cond = copy_cond_command (command->value.Cond);
 435         break;
 436 #endif
 437
 438       case cm_simple:
 439         new_command->value.Simple = copy_simple_command (command->value.Simple);
 440         break;
 441
 442       case cm_connection:
 443         {
 444           CONNECTION *new_connection;
 445
 446           new_connection = (CONNECTION *)xmalloc (sizeof (CONNECTION));
 447           new_connection->connector = command->value.Connection->connector;
 448           new_connection->first = copy_command (command->value.Connection->first);
 449           new_connection->second = copy_command (command->value.Connection->second);
 450           new_command->value.Connection = new_connection;
 451           break;
 452         }
 453
 454       case cm_function_def:
 455         new_command->value.Function_def = copy_function_def (command->value.Function_def);
 456         break;
 457     }
 458   return (new_command);
 459 }