commit bash-20090910 snapshot

[thirdparty/bash.git] / print_cmd.c

/* print_command -- A way to make readable commands from a command tree. */

/* Copyright (C) 1989-2009 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "config.h"

#include <stdio.h>

#if defined (HAVE_UNISTD_H)
#  ifdef _MINIX
#    include <sys/types.h>
#  endif
#  include <unistd.h>
#endif

#if defined (PREFER_STDARG)
#  include <stdarg.h>
#else
#  include <varargs.h>
#endif

#include "bashansi.h"
#include "bashintl.h"

#include "shell.h"
#include "flags.h"
#include <y.tab.h>	/* use <...> so we pick it up from the build directory */

#include "shmbutil.h"

#include "builtins/common.h"

#if !HAVE_DECL_PRINTF
extern int printf __P((const char *, ...));	/* Yuck.  Double yuck. */
#endif

extern int indirection_level;

static int indentation;
static int indentation_amount = 4;

#if defined (PREFER_STDARG)
typedef void PFUNC __P((const char *, ...));

static void cprintf __P((const char *, ...))  __attribute__((__format__ (printf, 1, 2)));
static void xprintf __P((const char *, ...))  __attribute__((__format__ (printf, 1, 2)));
#else
#define PFUNC VFunction
static void cprintf ();
static void xprintf ();
#endif

static void reset_locals __P((void));
static void newline __P((char *));
static void indent __P((int));
static void semicolon __P((void));
static void the_printed_command_resize __P((int));

static void make_command_string_internal __P((COMMAND *));
static void _print_word_list __P((WORD_LIST *, char *, PFUNC *));
static void command_print_word_list __P((WORD_LIST *, char *));
static void print_case_clauses __P((PATTERN_LIST *));
static void print_redirection_list __P((REDIRECT *));
static void print_redirection __P((REDIRECT *));
static void print_heredoc_header __P((REDIRECT *));
static void print_heredoc_body __P((REDIRECT *));
static void print_heredocs __P((REDIRECT *));
static void print_deferred_heredocs __P((const char *));

static void print_for_command __P((FOR_COM *));
#if defined (ARITH_FOR_COMMAND)
static void print_arith_for_command __P((ARITH_FOR_COM *));
#endif
#if defined (SELECT_COMMAND)
static void print_select_command __P((SELECT_COM *));
#endif
static void print_group_command __P((GROUP_COM *));
static void print_case_command __P((CASE_COM *));
static void print_while_command __P((WHILE_COM *));
static void print_until_command __P((WHILE_COM *));
static void print_until_or_while __P((WHILE_COM *, char *));
static void print_if_command __P((IF_COM *));
#if defined (COND_COMMAND)
static void print_cond_node __P((COND_COM *));
#endif
static void print_function_def __P((FUNCTION_DEF *));

#define PRINTED_COMMAND_INITIAL_SIZE 64
#define PRINTED_COMMAND_GROW_SIZE 128

char *the_printed_command = (char *)NULL;
int the_printed_command_size = 0;
int command_string_index = 0;

int xtrace_fd = -1;
FILE *xtrace_fp = 0;

#define CHECK_XTRACE_FP	xtrace_fp = (xtrace_fp ? xtrace_fp : stderr)

/* Non-zero means the stuff being printed is inside of a function def. */
static int inside_function_def;
static int skip_this_indent;
static int was_heredoc;
static int printing_connection;
static REDIRECT *deferred_heredocs;

/* The depth of the group commands that we are currently printing.  This
   includes the group command that is a function body. */
static int group_command_nesting;

/* A buffer to indicate the indirection level (PS4) when set -x is enabled. */
static char indirection_string[100];

/* Print COMMAND (a command tree) on standard output. */
void
print_command (command)
     COMMAND *command;
{
  command_string_index = 0;
  printf ("%s", make_command_string (command));
}

/* Make a string which is the printed representation of the command
   tree in COMMAND.  We return this string.  However, the string is
   not consed, so you have to do that yourself if you want it to
   remain around. */
char *
make_command_string (command)
     COMMAND *command;
{
  command_string_index = was_heredoc = 0;
  deferred_heredocs = 0;
  make_command_string_internal (command);
  return (the_printed_command);
}

/* The internal function.  This is the real workhorse. */
static void
make_command_string_internal (command)
     COMMAND *command;
{
  char s[3], *op;

  if (command == 0)
    cprintf ("");
  else
    {
      if (skip_this_indent)
	skip_this_indent--;
      else
	indent (indentation);

      if (command->flags & CMD_TIME_PIPELINE)
	{
	  cprintf ("time ");
	  if (command->flags & CMD_TIME_POSIX)
	    cprintf ("-p ");
	}

      if (command->flags & CMD_INVERT_RETURN)
	cprintf ("! ");

      switch (command->type)
	{
	case cm_for:
	  print_for_command (command->value.For);
	  break;

#if defined (ARITH_FOR_COMMAND)
	case cm_arith_for:
	  print_arith_for_command (command->value.ArithFor);
	  break;
#endif

#if defined (SELECT_COMMAND)
	case cm_select:
	  print_select_command (command->value.Select);
	  break;
#endif

	case cm_case:
	  print_case_command (command->value.Case);
	  break;

	case cm_while:
	  print_while_command (command->value.While);
	  break;

	case cm_until:
	  print_until_command (command->value.While);
	  break;

	case cm_if:
	  print_if_command (command->value.If);
	  break;

#if defined (DPAREN_ARITHMETIC)
	case cm_arith:
	  print_arith_command (command->value.Arith->exp);
	  break;
#endif

#if defined (COND_COMMAND)
	case cm_cond:
	  print_cond_command (command->value.Cond);
	  break;
#endif

	case cm_simple:
	  print_simple_command (command->value.Simple);
	  break;

	case cm_connection:

	  skip_this_indent++;
	  printing_connection++;
	  make_command_string_internal (command->value.Connection->first);

	  switch (command->value.Connection->connector)
	    {
	    case '&':
	    case '|':
	      {
		char c = command->value.Connection->connector;

		s[0] = ' ';
		s[1] = c;
		s[2] = '\0';
		
		print_deferred_heredocs (s);

		if (c != '&' || command->value.Connection->second)
		  {
		    cprintf (" ");
		    skip_this_indent++;
		  }
	      }
	      break;

	    case AND_AND:
	      print_deferred_heredocs (" && ");
	      if (command->value.Connection->second)
		skip_this_indent++;
	      break;

	    case OR_OR:
	      print_deferred_heredocs (" || ");
	      if (command->value.Connection->second)
		skip_this_indent++;
	      break;

	    case ';':
	      if (deferred_heredocs == 0)
		{
		  if (was_heredoc == 0)
		    cprintf (";");
		  else
		    was_heredoc = 0;
		}
	      else
		print_deferred_heredocs (inside_function_def ? "" : ";");

	      if (inside_function_def)
		cprintf ("\n");
	      else
		{
		  cprintf (" ");
		  if (command->value.Connection->second)
		    skip_this_indent++;
		}
	      break;

	    default:
	      cprintf (_("print_command: bad connector `%d'"),
		       command->value.Connection->connector);
	      break;
	    }

	  make_command_string_internal (command->value.Connection->second);
	  if (deferred_heredocs)
	    print_deferred_heredocs ("");
	  printing_connection--;	  	  
	  break;

	case cm_function_def:
	  print_function_def (command->value.Function_def);
	  break;

	case cm_group:
	  print_group_command (command->value.Group);
	  break;

	case cm_subshell:
	  cprintf ("( ");
	  skip_this_indent++;
	  make_command_string_internal (command->value.Subshell->command);
	  cprintf (" )");
	  break;

	case cm_coproc:
	  cprintf ("coproc %s ", command->value.Coproc->name);
	  skip_this_indent++;
	  make_command_string_internal (command->value.Coproc->command);
	  break;

	default:
	  command_error ("print_command", CMDERR_BADTYPE, command->type, 0);
	  break;
	}


      if (command->redirects)
	{
	  cprintf (" ");
	  print_redirection_list (command->redirects);
	}
    }
}

static void
_print_word_list (list, separator, pfunc)
     WORD_LIST *list;
     char *separator;
     PFUNC *pfunc;
{
  WORD_LIST *w;

  for (w = list; w; w = w->next)
    (*pfunc) ("%s%s", w->word->word, w->next ? separator : "");
}

void
print_word_list (list, separator)
     WORD_LIST *list;
     char *separator;
{
  _print_word_list (list, separator, xprintf);
}

void
xtrace_set (fd, fp)
     int fd;
     FILE *fp;
{
  if (fd >= 0 && sh_validfd (fd) == 0)
    {
      internal_error (_("xtrace_set: %d: invalid file descriptor"), fd);
      return;
    }
  if (fp == 0)
    {
      internal_error (_("xtrace_set: NULL file pointer"));
      return;
    }
  if (fd >= 0 && fileno (fp) != fd)
    internal_warning (_("xtrace fd (%d) != fileno xtrace fp (%d)"), fd, fileno (fp));
  
  xtrace_fd = fd;
  xtrace_fp = fp;
}

void
xtrace_init ()
{
  xtrace_set (-1, stderr);
}

void
xtrace_reset ()
{
  if (xtrace_fd >= 0 && xtrace_fp)
    {
      fflush (xtrace_fp);
      fclose (xtrace_fp);
    }
  else if (xtrace_fd >= 0)
    close (xtrace_fd);

  xtrace_fd = -1;
  xtrace_fp = stderr;
}

void
xtrace_fdchk (fd)
     int fd;
{
  if (fd == xtrace_fd)
    xtrace_reset ();
}

/* Return a string denoting what our indirection level is. */

char *
indirection_level_string ()
{
  register int i, j;
  char *ps4;
  char ps4_firstc[MB_LEN_MAX+1];
  int ps4_firstc_len, ps4_len;

  indirection_string[0] = '\0';
  ps4 = get_string_value ("PS4");

  if (ps4 == 0 || *ps4 == '\0')
    return (indirection_string);

  change_flag ('x', FLAG_OFF);
  ps4 = decode_prompt_string (ps4);
  change_flag ('x', FLAG_ON);

  if (ps4 == 0 || *ps4 == '\0')
    return (indirection_string);

#if defined (HANDLE_MULTIBYTE)
  ps4_len = strnlen (ps4, MB_CUR_MAX);
  ps4_firstc_len = MBLEN (ps4, ps4_len);
  if (ps4_firstc_len == 1 || ps4_firstc_len == 0 || MB_INVALIDCH (ps4_firstc_len))
    {
      ps4_firstc[0] = ps4[0];
      ps4_firstc[ps4_firstc_len = 1] = '\0';
    }
  else
    memcpy (ps4_firstc, ps4, ps4_firstc_len);
#else
  ps4_firstc[0] = ps4[0];
  ps4_firstc[ps4_firstc_len = 1] = '\0';
#endif
      
  for (i = j = 0; ps4_firstc[0] && j < indirection_level && i < 99; i += ps4_firstc_len, j++)
    {
      if (ps4_firstc_len == 1)
	indirection_string[i] = ps4_firstc[0];
      else
	memcpy (indirection_string+i, ps4_firstc, ps4_firstc_len);
    }      

  for (j = ps4_firstc_len; *ps4 && ps4[j] && i < 99; i++, j++)
    indirection_string[i] = ps4[j];

  indirection_string[i] = '\0';
  free (ps4);
  return (indirection_string);
}

void
xtrace_print_assignment (name, value, assign_list, xflags)
     char *name, *value;
     int assign_list, xflags;
{
  char *nval;

  CHECK_XTRACE_FP;

  if (xflags)
    fprintf (xtrace_fp, "%s", indirection_level_string ());

  /* VALUE should not be NULL when this is called. */
  if (*value == '\0' || assign_list)
    nval = value;
  else if (sh_contains_shell_metas (value))
    nval = sh_single_quote (value);
  else if (ansic_shouldquote (value))
    nval = ansic_quote (value, 0, (int *)0);
  else
    nval = value;

  if (assign_list)
    fprintf (xtrace_fp, "%s=(%s)\n", name, nval);
  else
    fprintf (xtrace_fp, "%s=%s\n", name, nval);

  if (nval != value)
    FREE (nval);

  fflush (xtrace_fp);
}

/* A function to print the words of a simple command when set -x is on. */
void
xtrace_print_word_list (list, xtflags)
     WORD_LIST *list;
     int xtflags;
{
  WORD_LIST *w;
  char *t, *x;

  CHECK_XTRACE_FP;

  if (xtflags)
    fprintf (xtrace_fp, "%s", indirection_level_string ());

  for (w = list; w; w = w->next)
    {
      t = w->word->word;
      if (t == 0 || *t == '\0')
	fprintf (xtrace_fp, "''%s", w->next ? " " : "");
      else if (sh_contains_shell_metas (t))
	{
	  x = sh_single_quote (t);
	  fprintf (xtrace_fp, "%s%s", x, w->next ? " " : "");
	  free (x);
	}
      else if (ansic_shouldquote (t))
	{
	  x = ansic_quote (t, 0, (int *)0);
	  fprintf (xtrace_fp, "%s%s", x, w->next ? " " : "");
	  free (x);
	}
      else
	fprintf (xtrace_fp, "%s%s", t, w->next ? " " : "");
    }
  fprintf (xtrace_fp, "\n");
  fflush (xtrace_fp);
}

static void
command_print_word_list (list, separator)
     WORD_LIST *list;
     char *separator;
{
  _print_word_list (list, separator, cprintf);
}

void
print_for_command_head (for_command)
     FOR_COM *for_command;
{
  cprintf ("for %s in ", for_command->name->word);
  command_print_word_list (for_command->map_list, " ");
}

void
xtrace_print_for_command_head (for_command)
     FOR_COM *for_command;
{
  CHECK_XTRACE_FP;
  fprintf (xtrace_fp, "%s", indirection_level_string ());
  fprintf (xtrace_fp, "for %s in ", for_command->name->word);
  xtrace_print_word_list (for_command->map_list, 0);
}

static void
print_for_command (for_command)
     FOR_COM *for_command;
{
  print_for_command_head (for_command);

  cprintf (";");
  newline ("do\n");
  indentation += indentation_amount;
  make_command_string_internal (for_command->action);
  semicolon ();
  indentation -= indentation_amount;
  newline ("done");
}

#if defined (ARITH_FOR_COMMAND)
static void
print_arith_for_command (arith_for_command)
     ARITH_FOR_COM *arith_for_command;
{
  cprintf ("for ((");
  command_print_word_list (arith_for_command->init, " ");
  cprintf ("; ");
  command_print_word_list (arith_for_command->test, " ");
  cprintf ("; ");
  command_print_word_list (arith_for_command->step, " ");
  cprintf ("))");
  newline ("do\n");
  indentation += indentation_amount;
  make_command_string_internal (arith_for_command->action);
  semicolon ();
  indentation -= indentation_amount;
  newline ("done");
}
#endif /* ARITH_FOR_COMMAND */

#if defined (SELECT_COMMAND)
void
print_select_command_head (select_command)
     SELECT_COM *select_command;
{
  cprintf ("select %s in ", select_command->name->word);
  command_print_word_list (select_command->map_list, " ");
}

void
xtrace_print_select_command_head (select_command)
     SELECT_COM *select_command;
{
  CHECK_XTRACE_FP;
  fprintf (xtrace_fp, "%s", indirection_level_string ());
  fprintf (xtrace_fp, "select %s in ", select_command->name->word);
  xtrace_print_word_list (select_command->map_list, 0);
}

static void
print_select_command (select_command)
     SELECT_COM *select_command;
{
  print_select_command_head (select_command);

  cprintf (";");
  newline ("do\n");
  indentation += indentation_amount;
  make_command_string_internal (select_command->action);
  semicolon ();
  indentation -= indentation_amount;
  newline ("done");
}
#endif /* SELECT_COMMAND */

static void
print_group_command (group_command)
     GROUP_COM *group_command;
{
  group_command_nesting++;
  cprintf ("{ ");

  if (inside_function_def == 0)
    skip_this_indent++;
  else
    {
      /* This is a group command { ... } inside of a function
	 definition, and should be printed as a multiline group
	 command, using the current indentation. */
      cprintf ("\n");
      indentation += indentation_amount;
    }

  make_command_string_internal (group_command->command);

  if (inside_function_def)
    {
      cprintf ("\n");
      indentation -= indentation_amount;
      indent (indentation);
    }
  else
    {
      semicolon ();
      cprintf (" ");
    }

  cprintf ("}");

  group_command_nesting--;
}

void
print_case_command_head (case_command)
     CASE_COM *case_command;
{
  cprintf ("case %s in ", case_command->word->word);
}

void
xtrace_print_case_command_head (case_command)
     CASE_COM *case_command;
{
  CHECK_XTRACE_FP;
  fprintf (xtrace_fp, "%s", indirection_level_string ());
  fprintf (xtrace_fp, "case %s in\n", case_command->word->word);
}

static void
print_case_command (case_command)
     CASE_COM *case_command;
{
  print_case_command_head (case_command);

  if (case_command->clauses)
    print_case_clauses (case_command->clauses);
  newline ("esac");
}

static void
print_case_clauses (clauses)
     PATTERN_LIST *clauses;
{
  indentation += indentation_amount;
  while (clauses)
    {
      newline ("");
      command_print_word_list (clauses->patterns, " | ");
      cprintf (")\n");
      indentation += indentation_amount;
      make_command_string_internal (clauses->action);
      indentation -= indentation_amount;
      if (clauses->flags & CASEPAT_FALLTHROUGH)
	newline (";&");
      else if (clauses->flags & CASEPAT_TESTNEXT)
	newline (";;&");
      else
	newline (";;");
      clauses = clauses->next;
    }
  indentation -= indentation_amount;
}

static void
print_while_command (while_command)
     WHILE_COM *while_command;
{
  print_until_or_while (while_command, "while");
}

static void
print_until_command (while_command)
     WHILE_COM *while_command;
{
  print_until_or_while (while_command, "until");
}

static void
print_until_or_while (while_command, which)
     WHILE_COM *while_command;
     char *which;
{
  cprintf ("%s ", which);
  skip_this_indent++;
  make_command_string_internal (while_command->test);
  semicolon ();
  cprintf (" do\n");	/* was newline ("do\n"); */
  indentation += indentation_amount;
  make_command_string_internal (while_command->action);
  indentation -= indentation_amount;
  semicolon ();
  newline ("done");
}

static void
print_if_command (if_command)
     IF_COM *if_command;
{
  cprintf ("if ");
  skip_this_indent++;
  make_command_string_internal (if_command->test);
  semicolon ();
  cprintf (" then\n");
  indentation += indentation_amount;
  make_command_string_internal (if_command->true_case);
  indentation -= indentation_amount;

  if (if_command->false_case)
    {
      semicolon ();
      newline ("else\n");
      indentation += indentation_amount;
      make_command_string_internal (if_command->false_case);
      indentation -= indentation_amount;
    }
  semicolon ();
  newline ("fi");
}

#if defined (DPAREN_ARITHMETIC)
void
print_arith_command (arith_cmd_list)
     WORD_LIST *arith_cmd_list;
{
  cprintf ("((");
  command_print_word_list (arith_cmd_list, " ");
  cprintf ("))");
}
#endif

#if defined (COND_COMMAND)
static void
print_cond_node (cond)
     COND_COM *cond;
{
  if (cond->flags & CMD_INVERT_RETURN)
    cprintf ("! ");

  if (cond->type == COND_EXPR)
    {
      cprintf ("( ");
      print_cond_node (cond->left);
      cprintf (" )");
    }
  else if (cond->type == COND_AND)
    {
      print_cond_node (cond->left);
      cprintf (" && ");
      print_cond_node (cond->right);
    }
  else if (cond->type == COND_OR)
    {
      print_cond_node (cond->left);
      cprintf (" || ");
      print_cond_node (cond->right);
    }
  else if (cond->type == COND_UNARY)
    {
      cprintf ("%s", cond->op->word);
      cprintf (" ");
      print_cond_node (cond->left);
    }
  else if (cond->type == COND_BINARY)
    {
      print_cond_node (cond->left);
      cprintf (" ");
      cprintf ("%s", cond->op->word);
      cprintf (" ");
      print_cond_node (cond->right);
    }
  else if (cond->type == COND_TERM)
    {
      cprintf ("%s", cond->op->word);		/* need to add quoting here */
    }
}

void
print_cond_command (cond)
     COND_COM *cond;
{
  cprintf ("[[ ");
  print_cond_node (cond);
  cprintf (" ]]");
}

#ifdef DEBUG
void
debug_print_cond_command (cond)
     COND_COM *cond;
{
  fprintf (stderr, "DEBUG: ");
  command_string_index = 0;
  print_cond_command (cond);
  fprintf (stderr, "%s\n", the_printed_command);
}
#endif

void
xtrace_print_cond_term (type, invert, op, arg1, arg2)
     int type, invert;
     WORD_DESC *op;
     char *arg1, *arg2;
{
  CHECK_XTRACE_FP;
  command_string_index = 0;
  fprintf (xtrace_fp, "%s", indirection_level_string ());
  fprintf (xtrace_fp, "[[ ");
  if (invert)
    fprintf (xtrace_fp, "! ");

  if (type == COND_UNARY)
    {
      fprintf (xtrace_fp, "%s ", op->word);
      fprintf (xtrace_fp, "%s", (arg1 && *arg1) ? arg1 : "''");
    }
  else if (type == COND_BINARY)
    {
      fprintf (xtrace_fp, "%s", (arg1 && *arg1) ? arg1 : "''");
      fprintf (xtrace_fp, " %s ", op->word);
      fprintf (xtrace_fp, "%s", (arg2 && *arg2) ? arg2 : "''");
    }

  fprintf (xtrace_fp, " ]]\n");

  fflush (xtrace_fp);
}	  
#endif /* COND_COMMAND */

#if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND)
/* A function to print the words of an arithmetic command when set -x is on. */
void
xtrace_print_arith_cmd (list)
     WORD_LIST *list;
{
  WORD_LIST *w;

  CHECK_XTRACE_FP;
  fprintf (xtrace_fp, "%s", indirection_level_string ());
  fprintf (xtrace_fp, "(( ");
  for (w = list; w; w = w->next)
    fprintf (xtrace_fp, "%s%s", w->word->word, w->next ? " " : "");
  fprintf (xtrace_fp, " ))\n");

  fflush (xtrace_fp);
}
#endif

void
print_simple_command (simple_command)
     SIMPLE_COM *simple_command;
{
  command_print_word_list (simple_command->words, " ");

  if (simple_command->redirects)
    {
      cprintf (" ");
      print_redirection_list (simple_command->redirects);
    }
}

static void
print_heredocs (heredocs)
     REDIRECT *heredocs;
{
  REDIRECT *hdtail;

  cprintf (" "); 
  for (hdtail = heredocs; hdtail; hdtail = hdtail->next)
    {
      print_redirection (hdtail);
      cprintf ("\n");
    }
  was_heredoc = 1;
}

/* Print heredocs that are attached to the command before the connector
   represented by CSTRING.  The parsing semantics require us to print the
   here-doc delimiters, then the connector (CSTRING), then the here-doc
   bodies.  We don't print the connector if it's a `;', but we use it to
   note not to print an extra space after the last heredoc body and
   newline. */
static void
print_deferred_heredocs (cstring)
     const char *cstring;
{
  REDIRECT *hdtail;	

  for (hdtail = deferred_heredocs; hdtail; hdtail = hdtail->next)
    {
      cprintf (" ");
      print_heredoc_header (hdtail);
    }
  if (cstring[0] != ';' || cstring[1])
    cprintf ("%s", cstring); 
  if (deferred_heredocs)
    cprintf ("\n");
  for (hdtail = deferred_heredocs; hdtail; hdtail = hdtail->next)
    {
      print_heredoc_body (hdtail);
      cprintf ("\n");
    }
  if (deferred_heredocs)
    {
      if (cstring && cstring[0] && (cstring[0] != ';' || cstring[1]))
	cprintf (" ");	/* make sure there's at least one space */
      dispose_redirects (deferred_heredocs);
      was_heredoc = 1;
    }
  deferred_heredocs = (REDIRECT *)NULL;
}
      
static void
print_redirection_list (redirects)
     REDIRECT *redirects;
{
  REDIRECT *heredocs, *hdtail, *newredir;

  heredocs = (REDIRECT *)NULL;
  hdtail = heredocs;

  was_heredoc = 0;
  while (redirects)
    {
      /* Defer printing the here documents until we've printed the
	 rest of the redirections. */
      if (redirects->instruction == r_reading_until || redirects->instruction == r_deblank_reading_until)
	{
	  newredir = copy_redirect (redirects);
	  newredir->next = (REDIRECT *)NULL;
	  if (heredocs)
	    {
	      hdtail->next = newredir;
	      hdtail = newredir;
	    }
	  else
	    hdtail = heredocs = newredir;
	}
      else if (redirects->instruction == r_duplicating_output_word && redirects->redirector.dest == 1)
	{
	  /* Temporarily translate it as the execution code does. */
	  redirects->instruction = r_err_and_out;
	  print_redirection (redirects);
	  redirects->instruction = r_duplicating_output_word;
	}
      else
	print_redirection (redirects);

      redirects = redirects->next;
      if (redirects)
	cprintf (" ");
    }

  /* Now that we've printed all the other redirections (on one line),
     print the here documents. */
  if (heredocs && printing_connection)
    deferred_heredocs = heredocs;
  else if (heredocs)
    {
      print_heredocs (heredocs);
      dispose_redirects (heredocs);
    }
}

static void
print_heredoc_header (redirect)
     REDIRECT *redirect;
{
  int kill_leading;
  char *x;

  kill_leading = redirect->instruction == r_deblank_reading_until;

  /* Here doc header */
  if (redirect->redirector.dest != 0)
    cprintf ("%d", redirect->redirector.dest);

  /* If the here document delimiter is quoted, single-quote it. */
  if (redirect->redirectee.filename->flags & W_QUOTED)
    {
      x = sh_single_quote (redirect->here_doc_eof);
      cprintf ("<<%s%s", kill_leading ? "-" : "", x);
      free (x);
    }
  else
    cprintf ("<<%s%s", kill_leading ? "-" : "", redirect->here_doc_eof);
}

static void
print_heredoc_body (redirect)
     REDIRECT *redirect;
{
  /* Here doc body */
  cprintf ("%s%s", redirect->redirectee.filename->word, redirect->here_doc_eof);
}

static void
print_redirection (redirect)
     REDIRECT *redirect;
{
  int kill_leading, redirector, redir_fd;
  WORD_DESC *redirectee;

  kill_leading = 0;
  redirectee = redirect->redirectee.filename;
  redirector = redirect->redirector.dest;
  redir_fd = redirect->redirectee.dest;

  switch (redirect->instruction)
    {
    case r_output_direction:
      if (redirector != 1)
	cprintf ("%d", redirector);
      cprintf ("> %s", redirectee->word);
      break;

    case r_input_direction:
      if (redirector != 0)
	cprintf ("%d", redirector);
      cprintf ("< %s", redirectee->word);
      break;

    case r_inputa_direction:	/* Redirection created by the shell. */
      cprintf ("&");
      break;

    case r_appending_to:
      if (redirector != 1)
	cprintf ("%d", redirector);
      cprintf (">> %s", redirectee->word);
      break;

    case r_deblank_reading_until:
    case r_reading_until:
      print_heredoc_header (redirect);
      cprintf ("\n");
      print_heredoc_body (redirect);
      break;

    case r_reading_string:
      if (redirector != 0)
	cprintf ("%d", redirector);
      if (ansic_shouldquote (redirect->redirectee.filename->word))
	{
	  char *x;
	  x = ansic_quote (redirect->redirectee.filename->word, 0, (int *)0);
	  cprintf ("<<< %s", x);
	  free (x);
	}
      else
	cprintf ("<<< %s", redirect->redirectee.filename->word);
      break;

    case r_duplicating_input:
      cprintf ("%d<&%d", redirector, redir_fd);
      break;

    case r_duplicating_output:
      cprintf ("%d>&%d", redirector, redir_fd);
      break;

    case r_duplicating_input_word:
      cprintf ("%d<&%s", redirector, redirectee->word);
      break;

    case r_duplicating_output_word:
      cprintf ("%d>&%s", redirector, redirectee->word);
      break;

    case r_move_input:
      cprintf ("%d<&%d-", redirector, redir_fd);
      break;

    case r_move_output:
      cprintf ("%d>&%d-", redirector, redir_fd);
      break;

    case r_move_input_word:
      cprintf ("%d<&%s-", redirector, redirectee->word);
      break;

    case r_move_output_word:
      cprintf ("%d>&%s-", redirector, redirectee->word);
      break;

    case r_close_this:
      cprintf ("%d>&-", redirector);
      break;

    case r_err_and_out:
      cprintf ("&>%s", redirectee->word);
      break;

    case r_append_err_and_out:
      cprintf ("&>>%s", redirectee->word);
      break;

    case r_input_output:
      if (redirector != 1)
	cprintf ("%d", redirector);
      cprintf ("<> %s", redirectee->word);
      break;

    case r_output_force:
      if (redirector != 1)
	cprintf ("%d", redirector);
      cprintf (">|%s", redirectee->word);
      break;
    }
}

static void
reset_locals ()
{
  inside_function_def = 0;
  indentation = 0;
  printing_connection = 0;
  deferred_heredocs = 0;
}

static void
print_function_def (func)
     FUNCTION_DEF *func;
{
  COMMAND *cmdcopy;
  REDIRECT *func_redirects;

  func_redirects = NULL;
  cprintf ("function %s () \n", func->name->word);
  add_unwind_protect (reset_locals, 0);

  indent (indentation);
  cprintf ("{ \n");

  inside_function_def++;
  indentation += indentation_amount;

  cmdcopy = copy_command (func->command);
  if (cmdcopy->type == cm_group)
    {
      func_redirects = cmdcopy->redirects;
      cmdcopy->redirects = (REDIRECT *)NULL;
    }
  make_command_string_internal (cmdcopy->type == cm_group
					? cmdcopy->value.Group->command
					: cmdcopy);

  remove_unwind_protect ();
  indentation -= indentation_amount;
  inside_function_def--;

  if (func_redirects)
    { /* { */
      newline ("} ");
      print_redirection_list (func_redirects);
      cmdcopy->redirects = func_redirects;
    }
  else
    newline ("}");

  dispose_command (cmdcopy);
}

/* Return the string representation of the named function.
   NAME is the name of the function.
   COMMAND is the function body.  It should be a GROUP_COM.
   flags&FUNC_MULTILINE is non-zero to pretty-print, or zero for all on one line.
   flags&FUNC_EXTERNAL means convert from internal to external form
  */
char *
named_function_string (name, command, flags)
     char *name;
     COMMAND *command;
     int flags;
{
  char *result;
  int old_indent, old_amount;
  COMMAND *cmdcopy;
  REDIRECT *func_redirects;

  old_indent = indentation;
  old_amount = indentation_amount;
  command_string_index = was_heredoc = 0;
  deferred_heredocs = 0;

  if (name && *name)
    cprintf ("%s ", name);

  cprintf ("() ");

  if ((flags & FUNC_MULTILINE) == 0)
    {
      indentation = 1;
      indentation_amount = 0;
    }
  else
    {
      cprintf ("\n");
      indentation += indentation_amount;
    }

  inside_function_def++;

  cprintf ((flags & FUNC_MULTILINE) ? "{ \n" : "{ ");

  cmdcopy = copy_command (command);
  /* Take any redirections specified in the function definition (which should
     apply to the function as a whole) and save them for printing later. */
  func_redirects = (REDIRECT *)NULL;
  if (cmdcopy->type == cm_group)
    {
      func_redirects = cmdcopy->redirects;
      cmdcopy->redirects = (REDIRECT *)NULL;
    }
  make_command_string_internal (cmdcopy->type == cm_group
					? cmdcopy->value.Group->command
					: cmdcopy);

  indentation = old_indent;
  indentation_amount = old_amount;
  inside_function_def--;

  if (func_redirects)
    { /* { */
      newline ("} ");
      print_redirection_list (func_redirects);
      cmdcopy->redirects = func_redirects;
    }
  else
    newline ("}");

  result = the_printed_command;

  if ((flags & FUNC_MULTILINE) == 0)
    {
#if 0
      register int i;
      for (i = 0; result[i]; i++)
	if (result[i] == '\n')
	  {
	    strcpy (result + i, result + i + 1);
	    --i;
	  }
#else
      if (result[2] == '\n')	/* XXX -- experimental */
	strcpy (result + 2, result + 3);
#endif
    }

  dispose_command (cmdcopy);

  if (flags & FUNC_EXTERNAL)
    result = remove_quoted_escapes (result);

  return (result);
}

static void
newline (string)
     char *string;
{
  cprintf ("\n");
  indent (indentation);
  if (string && *string)
    cprintf ("%s", string);
}

static char *indentation_string;
static int indentation_size;

static void
indent (amount)
     int amount;
{
  register int i;

  RESIZE_MALLOCED_BUFFER (indentation_string, 0, amount, indentation_size, 16);

  for (i = 0; amount > 0; amount--)
    indentation_string[i++] = ' ';
  indentation_string[i] = '\0';
  cprintf (indentation_string);
}

static void
semicolon ()
{
  if (command_string_index > 0 &&
       (the_printed_command[command_string_index - 1] == '&' ||
        the_printed_command[command_string_index - 1] == '\n'))
    return;
  cprintf (";");
}

/* How to make the string. */
static void
#if defined (PREFER_STDARG)
cprintf (const char *control, ...)
#else
cprintf (control, va_alist)
     const char *control;
     va_dcl
#endif
{
  register const char *s;
  char char_arg[2], *argp, intbuf[INT_STRLEN_BOUND (int) + 1];
  int digit_arg, arg_len, c;
  va_list args;

  SH_VA_START (args, control);

  arg_len = strlen (control);
  the_printed_command_resize (arg_len + 1);

  char_arg[1] = '\0';
  s = control;
  while (s && *s)
    {
      c = *s++;
      argp = (char *)NULL;
      if (c != '%' || !*s)
	{
	  char_arg[0] = c;
	  argp = char_arg;
	  arg_len = 1;
	}
      else
	{
	  c = *s++;
	  switch (c)
	    {
	    case '%':
	      char_arg[0] = c;
	      argp = char_arg;
	      arg_len = 1;
	      break;

	    case 's':
	      argp = va_arg (args, char *);
	      arg_len = strlen (argp);
	      break;

	    case 'd':
	      /* Represent an out-of-range file descriptor with an out-of-range
		 integer value.  We can do this because the only use of `%d' in
		 the calls to cprintf is to output a file descriptor number for
		 a redirection. */
	      digit_arg = va_arg (args, int);
	      if (digit_arg < 0)
		{
		  sprintf (intbuf, "%u", (unsigned)-1);
		  argp = intbuf;
		}
	      else
	        argp = inttostr (digit_arg, intbuf, sizeof (intbuf));
	      arg_len = strlen (argp);
	      break;

	    case 'c':
	      char_arg[0] = va_arg (args, int);
	      argp = char_arg;
	      arg_len = 1;
	      break;

	    default:
	      programming_error (_("cprintf: `%c': invalid format character"), c);
	      /*NOTREACHED*/
	    }
	}

      if (argp && arg_len)
	{
	  the_printed_command_resize (arg_len + 1);
	  FASTCOPY (argp, the_printed_command + command_string_index, arg_len);
	  command_string_index += arg_len;
	}
    }

  the_printed_command[command_string_index] = '\0';
}

/* Ensure that there is enough space to stuff LENGTH characters into
   THE_PRINTED_COMMAND. */
static void
the_printed_command_resize (length)
     int length;
{
  if (the_printed_command == 0)
    {
      the_printed_command_size = (length + PRINTED_COMMAND_INITIAL_SIZE - 1) & ~(PRINTED_COMMAND_INITIAL_SIZE - 1);
      the_printed_command = (char *)xmalloc (the_printed_command_size);
      command_string_index = 0;
    }
  else if ((command_string_index + length) >= the_printed_command_size)
    {
      int new;
      new = command_string_index + length + 1;

      /* Round up to the next multiple of PRINTED_COMMAND_GROW_SIZE. */
      new = (new + PRINTED_COMMAND_GROW_SIZE - 1) & ~(PRINTED_COMMAND_GROW_SIZE - 1);
      the_printed_command_size = new;

      the_printed_command = (char *)xrealloc (the_printed_command, the_printed_command_size);
    }
}

#if defined (HAVE_VPRINTF)
/* ``If vprintf is available, you may assume that vfprintf and vsprintf are
     also available.'' */

static void
#if defined (PREFER_STDARG)
xprintf (const char *format, ...)
#else
xprintf (format, va_alist)
     const char *format;
     va_dcl
#endif
{
  va_list args;

  SH_VA_START (args, format);

  vfprintf (stdout, format, args);
  va_end (args);
}

#else

static void
xprintf (format, arg1, arg2, arg3, arg4, arg5)
     const char *format;
{
  printf (format, arg1, arg2, arg3, arg4, arg5);
}

#endif /* !HAVE_VPRINTF */