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;
  73
  74   for (new_list = (WORD_LIST *)NULL; list; list = list->next)
  75     new_list = make_word_list (copy_word (list->word), new_list);
  76
  77   return (REVERSE_LIST (new_list, WORD_LIST *));
  78 }
  79
  80 static PATTERN_LIST *
  81 copy_case_clause (clause)
  82      PATTERN_LIST *clause;
  83 {
  84   PATTERN_LIST *new_clause;
  85
  86   new_clause = (PATTERN_LIST *)xmalloc (sizeof (PATTERN_LIST));
  87   new_clause->patterns = copy_word_list (clause->patterns);
  88   new_clause->action = copy_command (clause->action);
  89   new_clause->flags = clause->flags;
  90   return (new_clause);
  91 }
  92
  93 static PATTERN_LIST *
  94 copy_case_clauses (clauses)
  95      PATTERN_LIST *clauses;
  96 {
  97   PATTERN_LIST *new_list, *new_clause;
  98
  99   for (new_list = (PATTERN_LIST *)NULL; clauses; clauses = clauses->next)
 100     {
 101       new_clause = copy_case_clause (clauses);
 102       new_clause->next = new_list;
 103       new_list = new_clause;
 104     }
 105   return (REVERSE_LIST (new_list, PATTERN_LIST *));
 106 }
 107
 108 /* Copy a single redirect. */
 109 REDIRECT *
 110 copy_redirect (redirect)
 111      REDIRECT *redirect;
 112 {
 113   REDIRECT *new_redirect;
 114
 115   new_redirect = (REDIRECT *)xmalloc (sizeof (REDIRECT));
 116   FASTCOPY ((char *)redirect, (char *)new_redirect, (sizeof (REDIRECT)));
 117   switch (redirect->instruction)
 118     {
 119     case r_reading_until:
 120     case r_deblank_reading_until:
 121       new_redirect->here_doc_eof = savestring (redirect->here_doc_eof);
 122       /*FALLTHROUGH*/
 123     case r_reading_string:
 124     case r_appending_to:
 125     case r_output_direction:
 126     case r_input_direction:
 127     case r_inputa_direction:
 128     case r_err_and_out:
 129     case r_append_err_and_out:
 130     case r_input_output:
 131     case r_output_force:
 132     case r_duplicating_input_word:
 133     case r_duplicating_output_word:
 134     case r_move_input_word:
 135     case r_move_output_word:
 136       new_redirect->redirectee.filename = copy_word (redirect->redirectee.filename);
 137       break;
 138     case r_duplicating_input:
 139     case r_duplicating_output:
 140     case r_move_input:
 141     case r_move_output:
 142     case r_close_this:
 143       break;
 144     }
 145   return (new_redirect);
 146 }
 147
 148 REDIRECT *
 149 copy_redirects (list)
 150      REDIRECT *list;
 151 {
 152   REDIRECT *new_list, *temp;
 153
 154   for (new_list = (REDIRECT *)NULL; list; list = list->next)
 155     {
 156       temp = copy_redirect (list);
 157       temp->next = new_list;
 158       new_list = temp;
 159     }
 160   return (REVERSE_LIST (new_list, REDIRECT *));
 161 }
 162
 163 static FOR_COM *
 164 copy_for_command (com)
 165      FOR_COM *com;
 166 {
 167   FOR_COM *new_for;
 168
 169   new_for = (FOR_COM *)xmalloc (sizeof (FOR_COM));
 170   new_for->flags = com->flags;
 171   new_for->line = com->line;
 172   new_for->name = copy_word (com->name);
 173   new_for->map_list = copy_word_list (com->map_list);
 174   new_for->action = copy_command (com->action);
 175   return (new_for);
 176 }
 177
 178 #if defined (ARITH_FOR_COMMAND)
 179 static ARITH_FOR_COM *
 180 copy_arith_for_command (com)
 181      ARITH_FOR_COM *com;
 182 {
 183   ARITH_FOR_COM *new_arith_for;
 184
 185   new_arith_for = (ARITH_FOR_COM *)xmalloc (sizeof (ARITH_FOR_COM));
 186   new_arith_for->flags = com->flags;
 187   new_arith_for->line = com->line;
 188   new_arith_for->init = copy_word_list (com->init);
 189   new_arith_for->test = copy_word_list (com->test);
 190   new_arith_for->step = copy_word_list (com->step);
 191   new_arith_for->action = copy_command (com->action);
 192   return (new_arith_for);
 193 }
 194 #endif /* ARITH_FOR_COMMAND */
 195
 196 static GROUP_COM *
 197 copy_group_command (com)
 198      GROUP_COM *com;
 199 {
 200   GROUP_COM *new_group;
 201
 202   new_group = (GROUP_COM *)xmalloc (sizeof (GROUP_COM));
 203   new_group->command = copy_command (com->command);
 204   return (new_group);
 205 }
 206
 207 static SUBSHELL_COM *
 208 copy_subshell_command (com)
 209      SUBSHELL_COM *com;
 210 {
 211   SUBSHELL_COM *new_subshell;
 212
 213   new_subshell = (SUBSHELL_COM *)xmalloc (sizeof (SUBSHELL_COM));
 214   new_subshell->command = copy_command (com->command);
 215   new_subshell->flags = com->flags;
 216   return (new_subshell);
 217 }
 218
 219 static COPROC_COM *
 220 copy_coproc_command (com)
 221      COPROC_COM *com;
 222 {
 223   COPROC_COM *new_coproc;
 224
 225   new_coproc = (COPROC_COM *)xmalloc (sizeof (COPROC_COM));
 226   new_coproc->name = savestring (com->name);
 227   new_coproc->command = copy_command (com->command);
 228   new_coproc->flags = com->flags;
 229   return (new_coproc);
 230 }
 231
 232 static CASE_COM *
 233 copy_case_command (com)
 234      CASE_COM *com;
 235 {
 236   CASE_COM *new_case;
 237
 238   new_case = (CASE_COM *)xmalloc (sizeof (CASE_COM));
 239   new_case->flags = com->flags;
 240   new_case->line = com->line;
 241   new_case->word = copy_word (com->word);
 242   new_case->clauses = copy_case_clauses (com->clauses);
 243   return (new_case);
 244 }
 245
 246 static WHILE_COM *
 247 copy_while_command (com)
 248      WHILE_COM *com;
 249 {
 250   WHILE_COM *new_while;
 251
 252   new_while = (WHILE_COM *)xmalloc (sizeof (WHILE_COM));
 253   new_while->flags = com->flags;
 254   new_while->test = copy_command (com->test);
 255   new_while->action = copy_command (com->action);
 256   return (new_while);
 257 }
 258
 259 static IF_COM *
 260 copy_if_command (com)
 261      IF_COM *com;
 262 {
 263   IF_COM *new_if;
 264
 265   new_if = (IF_COM *)xmalloc (sizeof (IF_COM));
 266   new_if->flags = com->flags;
 267   new_if->test = copy_command (com->test);
 268   new_if->true_case = copy_command (com->true_case);
 269   new_if->false_case = com->false_case ? copy_command (com->false_case) : com->false_case;
 270   return (new_if);
 271 }
 272
 273 #if defined (DPAREN_ARITHMETIC)
 274 static ARITH_COM *
 275 copy_arith_command (com)
 276      ARITH_COM *com;
 277 {
 278   ARITH_COM *new_arith;
 279
 280   new_arith = (ARITH_COM *)xmalloc (sizeof (ARITH_COM));
 281   new_arith->flags = com->flags;
 282   new_arith->exp = copy_word_list (com->exp);
 283   new_arith->line = com->line;
 284
 285   return (new_arith);
 286 }
 287 #endif
 288
 289 #if defined (COND_COMMAND)
 290 static COND_COM *
 291 copy_cond_command (com)
 292      COND_COM *com;
 293 {
 294   COND_COM *new_cond;
 295
 296   new_cond = (COND_COM *)xmalloc (sizeof (COND_COM));
 297   new_cond->flags = com->flags;
 298   new_cond->line = com->line;
 299   new_cond->type = com->type;
 300   new_cond->op = com->op ? copy_word (com->op) : com->op;
 301   new_cond->left = com->left ? copy_cond_command (com->left) : (COND_COM *)NULL;
 302   new_cond->right = com->right ? copy_cond_command (com->right) : (COND_COM *)NULL;
 303
 304   return (new_cond);
 305 }
 306 #endif
 307
 308 static SIMPLE_COM *
 309 copy_simple_command (com)
 310      SIMPLE_COM *com;
 311 {
 312   SIMPLE_COM *new_simple;
 313
 314   new_simple = (SIMPLE_COM *)xmalloc (sizeof (SIMPLE_COM));
 315   new_simple->flags = com->flags;
 316   new_simple->words = copy_word_list (com->words);
 317   new_simple->redirects = com->redirects ? copy_redirects (com->redirects) : (REDIRECT *)NULL;
 318   new_simple->line = com->line;
 319   return (new_simple);
 320 }
 321
 322 FUNCTION_DEF *
 323 copy_function_def_contents (old, new_def)
 324      FUNCTION_DEF *old, *new_def;
 325 {
 326   new_def->name = copy_word (old->name);
 327   new_def->command = old->command ? copy_command (old->command) : old->command;
 328   new_def->flags = old->flags;
 329   new_def->line = old->line;
 330   new_def->source_file = old->source_file ? savestring (old->source_file) : old->source_file;
 331   return (new_def);
 332 }
 333
 334 FUNCTION_DEF *
 335 copy_function_def (com)
 336      FUNCTION_DEF *com;
 337 {
 338   FUNCTION_DEF *new_def;
 339
 340   new_def = (FUNCTION_DEF *)xmalloc (sizeof (FUNCTION_DEF));
 341   new_def = copy_function_def_contents (com, new_def);
 342   return (new_def);
 343 }
 344
 345 /* Copy the command structure in COMMAND.  Return a pointer to the
 346    copy.  Don't you forget to dispose_command () on this pointer
 347    later! */
 348 COMMAND *
 349 copy_command (command)
 350      COMMAND *command;
 351 {
 352   COMMAND *new_command;
 353
 354   if (command == NULL)
 355     return (command);
 356
 357   new_command = (COMMAND *)xmalloc (sizeof (COMMAND));
 358   FASTCOPY ((char *)command, (char *)new_command, sizeof (COMMAND));
 359   new_command->flags = command->flags;
 360   new_command->line = command->line;
 361
 362   if (command->redirects)
 363     new_command->redirects = copy_redirects (command->redirects);
 364
 365   switch (command->type)
 366     {
 367       case cm_for:
 368         new_command->value.For = copy_for_command (command->value.For);
 369         break;
 370
 371 #if defined (ARITH_FOR_COMMAND)
 372       case cm_arith_for:
 373         new_command->value.ArithFor = copy_arith_for_command (command->value.ArithFor);
 374         break;
 375 #endif
 376
 377 #if defined (SELECT_COMMAND)
 378       case cm_select:
 379         new_command->value.Select =
 380           (SELECT_COM *)copy_for_command ((FOR_COM *)command->value.Select);
 381         break;
 382 #endif
 383
 384       case cm_group:
 385         new_command->value.Group = copy_group_command (command->value.Group);
 386         break;
 387
 388       case cm_subshell:
 389         new_command->value.Subshell = copy_subshell_command (command->value.Subshell);
 390         break;
 391
 392       case cm_coproc:
 393         new_command->value.Coproc = copy_coproc_command (command->value.Coproc);
 394         break;
 395
 396       case cm_case:
 397         new_command->value.Case = copy_case_command (command->value.Case);
 398         break;
 399
 400       case cm_until:
 401       case cm_while:
 402         new_command->value.While = copy_while_command (command->value.While);
 403         break;
 404
 405       case cm_if:
 406         new_command->value.If = copy_if_command (command->value.If);
 407         break;
 408
 409 #if defined (DPAREN_ARITHMETIC)
 410       case cm_arith:
 411         new_command->value.Arith = copy_arith_command (command->value.Arith);
 412         break;
 413 #endif
 414
 415 #if defined (COND_COMMAND)
 416       case cm_cond:
 417         new_command->value.Cond = copy_cond_command (command->value.Cond);
 418         break;
 419 #endif
 420
 421       case cm_simple:
 422         new_command->value.Simple = copy_simple_command (command->value.Simple);
 423         break;
 424
 425       case cm_connection:
 426         {
 427           CONNECTION *new_connection;
 428
 429           new_connection = (CONNECTION *)xmalloc (sizeof (CONNECTION));
 430           new_connection->connector = command->value.Connection->connector;
 431           new_connection->first = copy_command (command->value.Connection->first);
 432           new_connection->second = copy_command (command->value.Connection->second);
 433           new_command->value.Connection = new_connection;
 434           break;
 435         }
 436
 437       case cm_function_def:
 438         new_command->value.Function_def = copy_function_def (command->value.Function_def);
 439         break;
 440     }
 441   return (new_command);
 442 }