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Languguage OS II Version 10-94 (Knowledge Media)(1994).ISO
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bash-1.14.2
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dispose_cmd.c
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1994-03-03
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/* dispose_command.c -- dispose of a COMMAND structure. */
/* Copyright (C) 1987,1991 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
Bash is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
License for more details.
You should have received a copy of the GNU General Public License
along with Bash; see the file COPYING. If not, write to the Free
Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "shell.h"
/* Dispose of the command structure passed. */
void
dispose_command (command)
COMMAND *command;
{
if (!command) return;
if (command->redirects)
dispose_redirects (command->redirects);
switch (command->type)
{
case cm_for:
{
register FOR_COM *c = command->value.For;
dispose_word (c->name);
dispose_words (c->map_list);
dispose_command (c->action);
free (c);
break;
}
#if defined (SELECT_COMMAND)
case cm_select:
{
register SELECT_COM *c = command->value.Select;
dispose_word (c->name);
dispose_words (c->map_list);
dispose_command (c->action);
free (c);
break;
}
#endif
case cm_group:
{
dispose_command (command->value.Group->command);
free (command->value.Group);
break;
}
case cm_case:
{
register CASE_COM *c = command->value.Case;
PATTERN_LIST *t, *p = c->clauses;
dispose_word (c->word);
while (p)
{
dispose_words (p->patterns);
dispose_command (p->action);
t = p;
p = p->next;
free (t);
}
free (c);
break;
}
case cm_until:
case cm_while:
{
register WHILE_COM *c = command->value.While;
dispose_command (c->test);
dispose_command (c->action);
free (c);
break;
}
case cm_if:
{
register IF_COM *c = command->value.If;
dispose_command (c->test);
dispose_command (c->true_case);
dispose_command (c->false_case);
free (c);
break;
}
case cm_simple:
{
register SIMPLE_COM *c = command->value.Simple;
dispose_words (c->words);
dispose_redirects (c->redirects);
free (c);
break;
}
case cm_connection:
{
register CONNECTION *c = command->value.Connection;
dispose_command (c->first);
dispose_command (c->second);
free (c);
break;
}
case cm_function_def:
{
register FUNCTION_DEF *c = command->value.Function_def;
dispose_word (c->name);
dispose_command (c->command);
free (c);
break;
}
default:
report_error ("Attempt to free unknown command type `%d'.\n", command->type);
break;
}
free (command);
}
/* How to free a WORD_DESC. */
void
dispose_word (word)
WORD_DESC *word;
{
if (word->word)
free (word->word);
free (word);
}
/* How to get rid of a linked list of words. A WORD_LIST. */
void
dispose_words (list)
WORD_LIST *list;
{
WORD_LIST *t;
while (list)
{
t = list;
list = list->next;
dispose_word (t->word);
free (t);
}
}
/* How to dispose of an array of pointers to char. */
void
dispose_word_array (array)
char **array;
{
register int count;
for (count = 0; array[count]; count++)
free (array[count]);
free (array);
}
/* How to dispose of an list of redirections. A REDIRECT. */
void
dispose_redirects (list)
REDIRECT *list;
{
register REDIRECT *t;
while (list)
{
t = list;
list = list->next;
switch (t->instruction)
{
case r_reading_until:
case r_deblank_reading_until:
free (t->here_doc_eof);
/* ... */
case r_output_direction:
case r_input_direction:
case r_inputa_direction:
case r_appending_to:
case r_err_and_out:
case r_input_output:
case r_output_force:
case r_duplicating_input_word:
case r_duplicating_output_word:
dispose_word (t->redirectee.filename);
break;
}
free (t);
}
}