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print_cmd.c

/* print_command -- A way to make readable commands from a command tree. */
/* Copyright (C) 1989 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 2, 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, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */

#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 "shell.h"
#include "flags.h"
#include <y.tab.h>      /* use <...> so we pick it up from the build directory */
#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_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 (DPAREN_ARITHMETIC)
static void print_arith_command __P((ARITH_COM *));
#endif
#if defined (COND_COMMAND)
static void print_cond_node __P((COND_COM *));
static void print_cond_command __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;

/* 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;

/* 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;
  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;
{
  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);
        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++;
        make_command_string_internal (command->value.Connection->first);

        switch (command->value.Connection->connector)
          {
          case '&':
          case '|':
            {
            char c = command->value.Connection->connector;
            cprintf (" %c", c);
            if (c != '&' || command->value.Connection->second)
              {
                cprintf (" ");
                skip_this_indent++;
              }
            }
            break;

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

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

          case ';':
            if (was_heredoc == 0)
            cprintf (";");
            else
            was_heredoc = 0;

            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);
        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;

      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);
}

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

char *
indirection_level_string ()
{
  register int i, j;
  char *ps4;

  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);

  for (i = 0; *ps4 && i < indirection_level && i < 99; i++)
    indirection_string[i] = *ps4;

  for (j = 1; *ps4 && ps4[j] && i < 99; i++, j++)
    indirection_string[i] = ps4[j];

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

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

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

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

static void
print_for_command (for_command)
     FOR_COM *for_command;
{
  cprintf ("for %s in ", for_command->name->word);
  command_print_word_list (for_command->map_list, " ");
  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)
static void
print_select_command (select_command)
     SELECT_COM *select_command;
{
  cprintf ("select %s in ", select_command->name->word);
  command_print_word_list (select_command->map_list, " ");
  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--;
}

static void
print_case_command (case_command)
     CASE_COM *case_command;
{
  cprintf ("case %s in ", case_command->word->word);
  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;
      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)
static void
print_arith_command (arith_command)
     ARITH_COM *arith_command;
{
  cprintf ("(( ");
  command_print_word_list (arith_command->exp, " ");
  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 */
    }
}

static 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;
{
  command_string_index = 0;
  fprintf (stderr, "%s", indirection_level_string ());
  fprintf (stderr, "[[ ");
  if (invert)
    fprintf (stderr, "! ");

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

  fprintf (stderr, " ]]\n");
}       
#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;

  fprintf (stderr, "%s", indirection_level_string ());
  fprintf (stderr, "(( ");
  for (w = list; w; w = w->next)
    fprintf (stderr, "%s%s", w->word->word, w->next ? " " : "");
  fprintf (stderr, " ))\n");
}
#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_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
      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)
    {
      cprintf (" "); 
      for (hdtail = heredocs; hdtail; hdtail = hdtail->next)
      {
        print_redirection (hdtail);
        cprintf ("\n");
      }
      dispose_redirects (heredocs);
      was_heredoc = 1;
    }
}

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;
  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:
      kill_leading++;
      /* ... */
    case r_reading_until:
      if (redirector != 0)
      cprintf ("%d", redirector);
      /* If the here document delimiter is quoted, single-quote it. */
      if (redirect->redirectee.filename->flags & W_QUOTED)
      {
        char *x;
        x = sh_single_quote (redirect->here_doc_eof);
        cprintf ("<<%s%s\n", kill_leading? "-" : "", x);
        free (x);
      }
      else
      cprintf ("<<%s%s\n", kill_leading? "-" : "", redirect->here_doc_eof);
      cprintf ("%s%s",
             redirect->redirectee.filename->word, redirect->here_doc_eof);
      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_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;
}

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.
   MULTI_LINE is non-zero to pretty-print, or zero for all on one line.
  */
char *
named_function_string (name, command, multi_line)
     char *name;
     COMMAND *command;
     int multi_line;
{
  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;

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

  cprintf ("() ");

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

  inside_function_def++;

  cprintf (multi_line ? "{ \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 (!multi_line)
    {
#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);

  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: bad `%%' argument (%c)", 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 */

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