io.c

GNU 系统开发优化 C 语言程序的应用程序

/* Copyright (c) 1992, Free Software Foundation, Inc.  All rights reserved.

   Copyright (c) 1985 Sun Microsystems, Inc. Copyright (c) 1980 The Regents
   of the University of California. Copyright (c) 1976 Board of Trustees of
   the University of Illinois. All rights reserved.

   Redistribution and use in source and binary forms are permitted
   provided that
   the above copyright notice and this paragraph are duplicated in all such
   forms and that any documentation, advertising materials, and other
   materials related to such distribution and use acknowledge that the
   software was developed by the University of California, Berkeley, the
   University of Illinois, Urbana, and Sun Microsystems, Inc.  The name of
   either University or Sun Microsystems may not be used to endorse or
   promote products derived from this software without specific prior written
   permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
   IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES
   OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */


#include "sys.h"
#include "indent.h"
#include <ctype.h>

#ifdef VMS
#   include <file.h>
#   include <types.h>
#   include <stat.h>
#else  /* not VMS */

/* POSIX says that <fcntl.h> should exist.  Some systems might need to use
   <sys/fcntl.h> or <sys/file.h> instead.  */
#include <fcntl.h>

#include <sys/types.h>
#include <sys/stat.h>
#endif /* not VMS */

/* number of levels a label is placed to left of code */
#define LABEL_OFFSET 2


/* Stuff that needs to be shared with the rest of indent. Documented in
   indent.h.  */
char *in_prog;
char *in_prog_pos;
char *cur_line;
unsigned long in_prog_size;
FILE *output;
char *buf_ptr;
char *buf_end;
int had_eof;
int out_lines;
int com_lines;

int suppress_blanklines = 0;
static int comment_open;

int paren_target;

/* Use `perror' to print the system error message
   caused by OFFENDER. */

static char *errbuf;

void
sys_error (offender)
     char *offender;
{
  int size = strlen (offender);
  static int buffer_size;

  if (errbuf == 0)
    {
      buffer_size = size + 10;	/* Extra for random unix lossage */
      errbuf = (char *) xmalloc (buffer_size);
    }
  else if (size + 10 > buffer_size)
    {
      buffer_size = size + 10;
      errbuf = xrealloc (errbuf, buffer_size);
    }
  sprintf (errbuf, "indent: %s", offender);
  perror (errbuf);
  exit (1);
}

#ifdef VMS
int
vms_read (int file_desc, void *buffer, int nbytes)
{
    register char *bufp;
    register int nread, nleft;

    bufp  = buffer;
    nread = 0;
    nleft = nbytes;

    while (nread = read (file_desc, bufp, nleft), nread > 0)
      {
        bufp += nread;
        nleft -= nread;
        if (nleft < 0)
            sys_error ("Internal buffering error");
    }

    return nread;
}
#endif /* VMS */

INLINE int
count_columns (column, bp)
     int column;
     char *bp;
{
  while (*bp != '\0')
    {
      switch (*bp++)
	{
	case EOL:
	case 014:		/* form feed */
	  column = 1;
	  break;
	case TAB:
	  column += tabsize - (column - 1) % tabsize;
	  break;
	case 010:		/* backspace */
	  --column;
	  break;
	default:
	  ++column;
	  break;
	}
    }

  return column;
}

/* Return the column we are at in the input line. */

INLINE int
current_column ()
{
  char *p;
  int column = 1;

  if (buf_ptr >= save_com.ptr && buf_ptr <= save_com.end)
    p = save_com.ptr;
  else
    p = cur_line;

#if 0
  /* Paranoia */
  if (! (buf_ptr >= cur_line && buf_ptr < in_prog_pos))
    abort ();
#endif

  column = 1;
  while (p < buf_ptr)
    switch (*p++)
      {
      case EOL:
      case 014:			/* form feed */
	column = 1;
	break;
      case TAB:
	column += tabsize - (column - 1) % tabsize;
#if 0
	column += tabsize - (column % tabsize) + 1;
#endif
	break;
      case '\b':		/* backspace */
	column--;
	break;
      default:
	column++;
	break;
      }

  return column;
}

void
dump_line ()
{				/* dump_line is the routine that actually
				   effects the printing of the new source. It
				   prints the label section, followed by the
				   code section with the appropriate nesting
				   level, followed by any comments */
  register int cur_col;
  register int target_col = 0;
  static not_first_line;

  if (parser_state_tos->procname[0])
    {
      if (troff)
	{
	  if (comment_open)
	    {
	      comment_open = 0;
	      fprintf (output, ".*/\n");
	    }
	  fprintf (output, ".Pr \"%.*s\"\n",
		   parser_state_tos->procname_end - parser_state_tos->procname,
		   parser_state_tos->procname);
	}
      parser_state_tos->ind_level = 0;
      parser_state_tos->procname = "\0";
    }

  /* A blank line */
  if (s_code == e_code && s_lab == e_lab && s_com == e_com)
    {
      /* If we have a formfeed on a blank line, we should just output it,
         rather than treat it as a normal blank line.  */
      if (parser_state_tos->use_ff)
	{
	  putc ('\014', output);
	  parser_state_tos->use_ff = false;
	}
      else
	{
	  if (suppress_blanklines > 0)
	    suppress_blanklines--;
	  else
	    {
	      parser_state_tos->bl_line = true;
	      n_real_blanklines++;
	    }
	}
    }
  else
    {
      suppress_blanklines = 0;
      parser_state_tos->bl_line = false;
      if (prefix_blankline_requested
	  && not_first_line
	  && n_real_blanklines == 0)
	n_real_blanklines = 1;
      else if (swallow_optional_blanklines && n_real_blanklines > 1)
	n_real_blanklines = 1;

      while (--n_real_blanklines >= 0)
	putc (EOL, output);
      n_real_blanklines = 0;
      if (parser_state_tos->ind_level == 0)
	parser_state_tos->ind_stmt = 0;	/* this is a class A kludge. dont do
					   additional statement indentation
					   if we are at bracket level 0 */

      if (e_lab != s_lab || e_code != s_code)
	++code_lines;		/* keep count of lines with code */


      if (e_lab != s_lab)
	{			/* print lab, if any */
	  if (comment_open)
	    {
	      comment_open = 0;
	      fprintf (output, ".*/\n");
	    }
	  while (e_lab > s_lab && (e_lab[-1] == ' ' || e_lab[-1] == TAB))
	    e_lab--;
	  cur_col = pad_output (1, compute_label_target ());
	  if (s_lab[0] == '#' && (strncmp (s_lab, "#else", 5) == 0
				  || strncmp (s_lab, "#endif", 6) == 0))
	    {
	      /* Treat #else and #endif as a special case because any text
	         after #else or #endif should be converted to a comment.  */
	      register char *s = s_lab;
	      if (e_lab[-1] == EOL)
		e_lab--;
	      do
		putc (*s++, output);
	      while (s < e_lab && 'a' <= *s && *s <= 'z');
	      while ((*s == ' ' || *s == TAB) && s < e_lab)
		s++;
	      if (s < e_lab)
		{
		  if (s[0] == '/' && (s[1] == '*' || s[1] == '/'))
		    fprintf (output, (tabsize > 1 ? "\t%.*s" : "  %.*s"),
			     e_lab - s, s);
		  else
		    fprintf (output, (tabsize > 1
				      ? "\t/* %.*s */"
				      : "  /* %.*s */"),
			     e_lab - s, s);
		}
	    }
	  else
	    fprintf (output, "%.*s", e_lab - s_lab, s_lab);
	  cur_col = count_columns (cur_col, s_lab);
	}
      else
	cur_col = 1;		/* there is no label section */

      parser_state_tos->pcase = false;

      if (s_code != e_code)
	{			/* print code section, if any */
	  register char *p;
	  register i;

	  if (comment_open)
	    {
	      comment_open = 0;
	      fprintf (output, ".*/\n");
	    }

	  /* If a comment begins this line, then indent it to the right
	     column for comments, otherwise the line starts with code,
	     so indent it for code. */
	  if (embedded_comment_on_line == 1)
	    target_col = parser_state_tos->com_col;
	  else
	    target_col = compute_code_target ();

	  /* If a line ends in an lparen character, the following line should
	     not line up with the parenthesis, but should be indented by the
	     usual amount.  */
	  if (parser_state_tos->last_token == lparen)
	    {
	      parser_state_tos->paren_indents[parser_state_tos->p_l_follow - 1]
		+= ind_size - 1;
	    }

	  for (i = 0; i < parser_state_tos->p_l_follow; i++)
	    if (parser_state_tos->paren_indents[i] >= 0)
	      parser_state_tos->paren_indents[i]
		= -(parser_state_tos->paren_indents[i] + target_col);

	  cur_col = pad_output (cur_col, target_col);
	  for (p = s_code; p < e_code; p++)
	    {
#if 0
	      if (*p == (char) 0200)
		fprintf (output, "%d", (int) (target_col * 7));
	      else
		if (tabsize > 1)
#endif
		putc (*p, output);

#if 0
	      else
		{
		  int width = 1;
		  if (*p == TAB)
		    width = (tabsize - ((cur_col - 1) % tabsize));
		  cur_col += width;
		  while (width--)
		    putc (*p, output);
		}
#endif
	    }
	  cur_col = count_columns (cur_col, s_code);
	}

      if (s_com != e_com)
	{
	  if (troff)
	    {
	      int all_here = 0;
	      register char *p;

	      if (e_com[-1] == '/' && e_com[-2] == '*')
		e_com -= 2, all_here++;
	      while (e_com > s_com && e_com[-1] == ' ')
		e_com--;
	      *e_com = 0;
	      p = s_com;
	      while (*p == ' ')
		p++;
	      if (p[0] == '/' && p[1] == '*')
		p += 2, all_here++;
	      else if (p[0] == '*')
		p += p[1] == '/' ? 2 : 1;
	      while (*p == ' ')
		p++;
	      if (*p == 0)
		goto inhibit_newline;
	      if (comment_open < 2 && parser_state_tos->box_com)
		{
		  comment_open = 0;
		  fprintf (output, ".*/\n");
		}
	      if (comment_open == 0)
		{
		  if ('a' <= *p && *p <= 'z')
		    *p = *p + 'A' - 'a';
		  if (e_com - p < 50 && all_here == 2)
		    {
		      register char *follow = p;
		      fprintf (output, "\n.nr C! \\w\1");
		      while (follow < e_com)
			{
			  switch (*follow)
			    {
			    case EOL:
			      putc (' ', output);
			    case 1:
			      break;
			    case '\\':
			      putc ('\\', output);
			    default:
			      putc (*follow, output);
			    }
			  follow++;
			}
		      putc (1, output);
		    }
		  fprintf (output, "\n./* %dp %d %dp\n",
			   (int) (parser_state_tos->com_col * 7),
			   (int) ((s_code != e_code || s_lab != e_lab)
				  - parser_state_tos->box_com),
			   (int) (target_col * 7));
		}
	      comment_open = 1 + parser_state_tos->box_com;
	      while (*p)
		{
		  if (*p == BACKSLASH)
		    putc (BACKSLASH, output);
		  putc (*p++, output);
		}
	    }
	  else
	    {
	      /* Here for comment printing.  This code is new as of
	         version 1.8 */
	      register target = parser_state_tos->com_col;
	      register char *com_st = s_com;

	      if (cur_col > target)
		{
		  putc (EOL, output);
		  cur_col = 1;
		  ++out_lines;
		}

	      cur_col = pad_output (cur_col, target);
	      fwrite (com_st, e_com - com_st, 1, output);
	      cur_col += e_com - com_st;
	      com_lines++;
	    }
	}
      else if (embedded_comment_on_line)
	com_lines++;
      embedded_comment_on_line = 0;

      if (parser_state_tos->use_ff)
	{
	  putc ('\014', output);
	  parser_state_tos->use_ff = false;
	}
      else