This file is enable.def, from which is created enable.c.
It implements the builtin "enable" in Bash.

Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.

This file is part of GNU Bash, the Bourne Again SHell.

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$PRODUCES enable.c

$BUILTIN enable
$FUNCTION enable_builtin
$SHORT_DOC enable [-n] [name ...]
Enable and disable builtin shell commands.  This allows
you to use a disk command which has the same name as a shell
builtin.  If -n is used, the NAMEs become disabled.  Otherwise
NAMEs are enabled.  For example, to use the `test' found on your
path instead of the shell builtin version, you type `enable -n test'.
$END

#include "../shell.h"
#include "../builtins.h"

static int enable_shell_command ();

/* Enable/disable shell commands present in LIST.  If list is not specified,
   then print out a list of shell commands showing which are enabled and
   which are disabled. */
enable_builtin (list)
     WORD_LIST *list;
{
  int result = 0, any_failed = 0;

  if (!list)
    {
      register int i;

      for (i = 0; i < num_shell_builtins; i++)
	{
	  if (!shell_builtins[i].function)
	    continue;

	  printf ("enable %s%s\n", shell_builtins[i].enabled ? "" : "-n ",
		  shell_builtins[i].name);
	}
    }
  else
    {
      int disable_p = (strcmp (list->word->word, "-n") == 0);

      if (disable_p)
	list = list->next;

      while (list)
	{
	  result = enable_shell_command (list->word->word, disable_p);
	  if (!result)
	    {
	      builtin_error ("%s: not a shell builtin", list->word->word);
	      any_failed++;
	    }
	  list = list->next;
	}
    }
  return (any_failed ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
}

/* Enable the shell command NAME.  If DISABLE_P is non-zero, then
   disable NAME instead. */
static int
enable_shell_command (name, disable_p)
     char *name;
     int disable_p;
{
  register int i;
  int found = 0;

  for (i = 0; i < num_shell_builtins; i++)
    {
      if (!shell_builtins[i].function)
	continue;

      if (strcmp (name, shell_builtins[i].name) == 0)
	{
	  found++;
	  shell_builtins[i].enabled = !disable_p;
	}
    }
  return (found);
}