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) 1987,1991 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 it
  10    under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 1, or (at your option)
  12    any later version.
  13
  14    Bash is distributed in the hope that it will be useful, but WITHOUT
  15    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  17    License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with Bash; see the file COPYING.  If not, write to the Free
  21    Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  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 WORD_DESC *
  36 copy_word (w)
  37      WORD_DESC *w;
  38 {
  39   WORD_DESC *new_word;
  40
  41   new_word = (WORD_DESC *)xmalloc (sizeof (WORD_DESC));
  42   FASTCOPY ((char *)w, (char *)new_word, sizeof (WORD_DESC));
  43   new_word->word = savestring (w->word);
  44   return (new_word);
  45 }
  46
  47 /* Copy the chain of words in LIST.  Return a pointer to
  48    the new chain. */
  49 WORD_LIST *
  50 copy_word_list (list)
  51      WORD_LIST *list;
  52 {
  53   WORD_LIST *new_list, *temp;
  54
  55   for (new_list = (WORD_LIST *)NULL; list; list = list->next)
  56     {
  57       temp = (WORD_LIST *)xmalloc (sizeof (WORD_LIST));
  58       temp->next = new_list;
  59       new_list = temp;
  60       new_list->word = copy_word (list->word);
  61     }
  62   return (REVERSE_LIST (new_list, WORD_LIST *));
  63 }
  64
  65 static PATTERN_LIST *
  66 copy_case_clause (clause)
  67      PATTERN_LIST *clause;
  68 {
  69   PATTERN_LIST *new_clause;
  70
  71   new_clause = (PATTERN_LIST *)xmalloc (sizeof (PATTERN_LIST));
  72   new_clause->patterns = copy_word_list (clause->patterns);
  73   new_clause->action = copy_command (clause->action);
  74   return (new_clause);
  75 }
  76
  77 static PATTERN_LIST *
  78 copy_case_clauses (clauses)
  79      PATTERN_LIST *clauses;
  80 {
  81   PATTERN_LIST *new_list, *new_clause;
  82
  83   for (new_list = (PATTERN_LIST *)NULL; clauses; clauses = clauses->next)
  84     {
  85       new_clause = copy_case_clause (clauses);
  86       new_clause->next = new_list;
  87       new_list = new_clause;
  88     }
  89   return (REVERSE_LIST (new_list, PATTERN_LIST *));
  90 }
  91
  92 /* Copy a single redirect. */
  93 REDIRECT *
  94 copy_redirect (redirect)
  95      REDIRECT *redirect;
  96 {
  97   REDIRECT *new_redirect;
  98
  99   new_redirect = (REDIRECT *)xmalloc (sizeof (REDIRECT));
 100   FASTCOPY ((char *)redirect, (char *)new_redirect, (sizeof (REDIRECT)));
 101   switch (redirect->instruction)
 102     {
 103     case r_reading_until:
 104     case r_deblank_reading_until:
 105       new_redirect->here_doc_eof = savestring (redirect->here_doc_eof);
 106       /*FALLTHROUGH*/
 107     case r_appending_to:
 108     case r_output_direction:
 109     case r_input_direction:
 110     case r_inputa_direction:
 111     case r_err_and_out:
 112     case r_input_output:
 113     case r_output_force:
 114     case r_duplicating_input_word:
 115     case r_duplicating_output_word:
 116       new_redirect->redirectee.filename = copy_word (redirect->redirectee.filename);
 117       break;
 118     case r_duplicating_input:
 119     case r_duplicating_output:
 120     case r_close_this:
 121       break;
 122     }
 123   return (new_redirect);
 124 }
 125
 126 REDIRECT *
 127 copy_redirects (list)
 128      REDIRECT *list;
 129 {
 130   REDIRECT *new_list, *temp;
 131
 132   for (new_list = (REDIRECT *)NULL; list; list = list->next)
 133     {
 134       temp = copy_redirect (list);
 135       temp->next = new_list;
 136       new_list = temp;
 137     }
 138   return (REVERSE_LIST (new_list, REDIRECT *));
 139 }
 140
 141 static FOR_COM *
 142 copy_for_command (com)
 143      FOR_COM *com;
 144 {
 145   FOR_COM *new_for;
 146
 147   new_for = (FOR_COM *)xmalloc (sizeof (FOR_COM));
 148   new_for->flags = com->flags;
 149   new_for->name = copy_word (com->name);
 150   new_for->map_list = copy_word_list (com->map_list);
 151   new_for->action = copy_command (com->action);
 152   return (new_for);
 153 }
 154
 155 static GROUP_COM *
 156 copy_group_command (com)
 157      GROUP_COM *com;
 158 {
 159   GROUP_COM *new_group;
 160
 161   new_group = (GROUP_COM *)xmalloc (sizeof (GROUP_COM));
 162   new_group->command = copy_command (com->command);
 163   return (new_group);
 164 }
 165
 166 static CASE_COM *
 167 copy_case_command (com)
 168      CASE_COM *com;
 169 {
 170   CASE_COM *new_case;
 171
 172   new_case = (CASE_COM *)xmalloc (sizeof (CASE_COM));
 173   new_case->flags = com->flags;
 174   new_case->word = copy_word (com->word);
 175   new_case->clauses = copy_case_clauses (com->clauses);
 176   return (new_case);
 177 }
 178
 179 static WHILE_COM *
 180 copy_while_command (com)
 181      WHILE_COM *com;
 182 {
 183   WHILE_COM *new_while;
 184
 185   new_while = (WHILE_COM *)xmalloc (sizeof (WHILE_COM));
 186   new_while->flags = com->flags;
 187   new_while->test = copy_command (com->test);
 188   new_while->action = copy_command (com->action);
 189   return (new_while);
 190 }
 191
 192 static IF_COM *
 193 copy_if_command (com)
 194      IF_COM *com;
 195 {
 196   IF_COM *new_if;
 197
 198   new_if = (IF_COM *)xmalloc (sizeof (IF_COM));
 199   new_if->flags = com->flags;
 200   new_if->test = copy_command (com->test);
 201   new_if->true_case = copy_command (com->true_case);
 202   new_if->false_case = copy_command (com->false_case);
 203   return (new_if);
 204 }
 205
 206 #if defined (DPAREN_ARITHMETIC)
 207 static ARITH_COM *
 208 copy_arith_command (com)
 209      ARITH_COM *com;
 210 {
 211   ARITH_COM *new_arith;
 212
 213   new_arith = (ARITH_COM *)xmalloc (sizeof (ARITH_COM));
 214   new_arith->flags = com->flags;
 215   new_arith->exp = copy_word_list (com->exp);
 216   new_arith->line = com->line;
 217
 218   return (new_arith);
 219 }
 220 #endif
 221
 222 #if defined (COND_COMMAND)
 223 static COND_COM *
 224 copy_cond_command (com)
 225      COND_COM *com;
 226 {
 227   COND_COM *new_cond;
 228
 229   new_cond = (COND_COM *)xmalloc (sizeof (COND_COM));
 230   new_cond->flags = com->flags;
 231   new_cond->line = com->line;
 232   new_cond->type = com->type;
 233   new_cond->op = com->op ? copy_word (com->op) : com->op;
 234   new_cond->left = com->left ? copy_cond_command (com->left) : (COND_COM *)NULL;
 235   new_cond->right = com->right ? copy_cond_command (com->right) : (COND_COM *)NULL;
 236
 237   return (new_cond);
 238 }
 239 #endif
 240
 241 static SIMPLE_COM *
 242 copy_simple_command (com)
 243      SIMPLE_COM *com;
 244 {
 245   SIMPLE_COM *new_simple;
 246
 247   new_simple = (SIMPLE_COM *)xmalloc (sizeof (SIMPLE_COM));
 248   new_simple->flags = com->flags;
 249   new_simple->words = copy_word_list (com->words);
 250   new_simple->redirects = copy_redirects (com->redirects);
 251   new_simple->line = com->line;
 252   return (new_simple);
 253 }
 254
 255 static FUNCTION_DEF *
 256 copy_function_def (com)
 257      FUNCTION_DEF *com;
 258 {
 259   FUNCTION_DEF *new_def;
 260
 261   new_def = (FUNCTION_DEF *)xmalloc (sizeof (FUNCTION_DEF));
 262   new_def->name = copy_word (com->name);
 263   new_def->command = copy_command (com->command);
 264   return (new_def);
 265 }
 266
 267 /* Copy the command structure in COMMAND.  Return a pointer to the
 268    copy.  Don't you forget to dispose_command () on this pointer
 269    later! */
 270 COMMAND *
 271 copy_command (command)
 272      COMMAND *command;
 273 {
 274   COMMAND *new_command;
 275
 276   if (command == NULL)
 277     return (command);
 278
 279   new_command = (COMMAND *)xmalloc (sizeof (COMMAND));
 280   FASTCOPY ((char *)command, (char *)new_command, sizeof (COMMAND));
 281   new_command->flags = command->flags;
 282   new_command->line = command->line;
 283
 284   if (command->redirects)
 285     new_command->redirects = copy_redirects (command->redirects);
 286
 287   switch (command->type)
 288     {
 289       case cm_for:
 290         new_command->value.For = copy_for_command (command->value.For);
 291         break;
 292
 293 #if defined (SELECT_COMMAND)
 294       case cm_select:
 295         new_command->value.Select =
 296           (SELECT_COM *)copy_for_command ((FOR_COM *)command->value.Select);
 297         break;
 298 #endif
 299
 300       case cm_group:
 301         new_command->value.Group = copy_group_command (command->value.Group);
 302         break;
 303
 304       case cm_case:
 305         new_command->value.Case = copy_case_command (command->value.Case);
 306         break;
 307
 308       case cm_until:
 309       case cm_while:
 310         new_command->value.While = copy_while_command (command->value.While);
 311         break;
 312
 313       case cm_if:
 314         new_command->value.If = copy_if_command (command->value.If);
 315         break;
 316
 317 #if defined (DPAREN_ARITHMETIC)
 318       case cm_arith:
 319         new_command->value.Arith = copy_arith_command (command->value.Arith);
 320         break;
 321 #endif
 322
 323 #if defined (COND_COMMAND)
 324       case cm_cond:
 325         new_command->value.Cond = copy_cond_command (command->value.Cond);
 326         break;
 327 #endif
 328
 329       case cm_simple:
 330         new_command->value.Simple = copy_simple_command (command->value.Simple);
 331         break;
 332
 333       case cm_connection:
 334         {
 335           CONNECTION *new_connection;
 336
 337           new_connection = (CONNECTION *)xmalloc (sizeof (CONNECTION));
 338           new_connection->connector = command->value.Connection->connector;
 339           new_connection->first = copy_command (command->value.Connection->first);
 340           new_connection->second = copy_command (command->value.Connection->second);
 341           new_command->value.Connection = new_connection;
 342           break;
 343         }
 344
 345       case cm_function_def:
 346         new_command->value.Function_def = copy_function_def (command->value.Function_def);
 347         break;
 348     }
 349   return (new_command);
 350 }