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 <stdio.h>
  26
  27 #if defined (HAVE_UNISTD_H)
  28 #  include <unistd.h>
  29 #endif
  30
  31 #if defined (HAVE_STRING_H)
  32 #  include <string.h>
  33 #else /* !HAVE_STRING_H */
  34 #  include <strings.h>
  35 #endif /* !HAVE_STRING_H */
  36
  37 #include "shell.h"
  38
  39 WORD_DESC *
  40 copy_word (word)
  41      WORD_DESC *word;
  42 {
  43   WORD_DESC *new_word;
  44
  45   new_word = (WORD_DESC *)xmalloc (sizeof (WORD_DESC));
  46   FASTCOPY ((char *)word, (char *)new_word, sizeof (WORD_DESC));
  47   new_word->word = savestring (word->word);
  48   return (new_word);
  49 }
  50
  51 /* Copy the chain of words in LIST.  Return a pointer to
  52    the new chain. */
  53 WORD_LIST *
  54 copy_word_list (list)
  55      WORD_LIST *list;
  56 {
  57   WORD_LIST *new_list, *temp;
  58
  59   for (new_list = (WORD_LIST *)NULL; list; list = list->next)
  60     {
  61       temp = (WORD_LIST *)xmalloc (sizeof (WORD_LIST));
  62       temp->next = new_list;
  63       new_list = temp;
  64       new_list->word = copy_word (list->word);
  65     }
  66   return (REVERSE_LIST (new_list, WORD_LIST *));
  67 }
  68
  69 static PATTERN_LIST *
  70 copy_case_clause (clause)
  71      PATTERN_LIST *clause;
  72 {
  73   PATTERN_LIST *new_clause;
  74
  75   new_clause = (PATTERN_LIST *)xmalloc (sizeof (PATTERN_LIST));
  76   new_clause->patterns = copy_word_list (clause->patterns);
  77   new_clause->action = copy_command (clause->action);
  78   return (new_clause);
  79 }
  80
  81 static PATTERN_LIST *
  82 copy_case_clauses (clauses)
  83      PATTERN_LIST *clauses;
  84 {
  85   PATTERN_LIST *new_list, *new_clause;
  86
  87   for (new_list = (PATTERN_LIST *)NULL; clauses; clauses = clauses->next)
  88     {
  89       new_clause = copy_case_clause (clauses);
  90       new_clause->next = new_list;
  91       new_list = new_clause;
  92     }
  93   return (REVERSE_LIST (new_list, PATTERN_LIST *));
  94 }
  95
  96 /* Copy a single redirect. */
  97 REDIRECT *
  98 copy_redirect (redirect)
  99      REDIRECT *redirect;
 100 {
 101   REDIRECT *new_redirect;
 102
 103   new_redirect = (REDIRECT *)xmalloc (sizeof (REDIRECT));
 104   FASTCOPY ((char *)redirect, (char *)new_redirect, (sizeof (REDIRECT)));
 105   switch (redirect->instruction)
 106     {
 107     case r_reading_until:
 108     case r_deblank_reading_until:
 109       new_redirect->here_doc_eof = savestring (redirect->here_doc_eof);
 110       /*FALLTHROUGH*/
 111     case r_appending_to:
 112     case r_output_direction:
 113     case r_input_direction:
 114     case r_inputa_direction:
 115     case r_err_and_out:
 116     case r_input_output:
 117     case r_output_force:
 118     case r_duplicating_input_word:
 119     case r_duplicating_output_word:
 120       new_redirect->redirectee.filename = copy_word (redirect->redirectee.filename);
 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 static SIMPLE_COM *
 207 copy_simple_command (com)
 208      SIMPLE_COM *com;
 209 {
 210   SIMPLE_COM *new_simple = (SIMPLE_COM *)xmalloc (sizeof (SIMPLE_COM));
 211
 212   new_simple->flags = com->flags;
 213   new_simple->words = copy_word_list (com->words);
 214   new_simple->redirects = copy_redirects (com->redirects);
 215   new_simple->line = com->line;
 216   return (new_simple);
 217 }
 218
 219 static FUNCTION_DEF *
 220 copy_function_def (com)
 221      FUNCTION_DEF *com;
 222 {
 223   FUNCTION_DEF *new_def;
 224
 225   new_def = (FUNCTION_DEF *)xmalloc (sizeof (FUNCTION_DEF));
 226   new_def->name = copy_word (com->name);
 227   new_def->command = copy_command (com->command);
 228   return (new_def);
 229 }
 230
 231 /* Copy the command structure in COMMAND.  Return a pointer to the
 232    copy.  Don't you forget to dispose_command () on this pointer
 233    later! */
 234 COMMAND *
 235 copy_command (command)
 236      COMMAND *command;
 237 {
 238   COMMAND *new_command;
 239
 240   if (command == NULL)
 241     return (command);
 242
 243   new_command = (COMMAND *)xmalloc (sizeof (COMMAND));
 244   FASTCOPY ((char *)command, (char *)new_command, sizeof (COMMAND));
 245   new_command->flags = command->flags;
 246   new_command->line = command->line;
 247
 248   if (command->redirects)
 249     new_command->redirects = copy_redirects (command->redirects);
 250
 251   switch (command->type)
 252     {
 253       case cm_for:
 254         new_command->value.For = copy_for_command (command->value.For);
 255         break;
 256
 257 #if defined (SELECT_COMMAND)
 258       case cm_select:
 259         new_command->value.Select =
 260           (SELECT_COM *)copy_for_command ((FOR_COM *)command->value.Select);
 261         break;
 262 #endif
 263
 264       case cm_group:
 265         new_command->value.Group = copy_group_command (command->value.Group);
 266         break;
 267
 268       case cm_case:
 269         new_command->value.Case = copy_case_command (command->value.Case);
 270         break;
 271
 272       case cm_until:
 273       case cm_while:
 274         new_command->value.While = copy_while_command (command->value.While);
 275         break;
 276
 277       case cm_if:
 278         new_command->value.If = copy_if_command (command->value.If);
 279         break;
 280
 281       case cm_simple:
 282         new_command->value.Simple = copy_simple_command (command->value.Simple);
 283         break;
 284
 285       case cm_connection:
 286         {
 287           CONNECTION *new_connection;
 288
 289           new_connection = (CONNECTION *)xmalloc (sizeof (CONNECTION));
 290           new_connection->connector = command->value.Connection->connector;
 291           new_connection->first = copy_command (command->value.Connection->first);
 292           new_connection->second = copy_command (command->value.Connection->second);
 293           new_command->value.Connection = new_connection;
 294           break;
 295         }
 296
 297       case cm_function_def:
 298         new_command->value.Function_def = copy_function_def (command->value.Function_def);
 299         break;
 300     }
 301   return (new_command);
 302 }