/*
 * 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.
 */

#ifndef lint
static char sccsid[] = "@(#)io.c	5.10 (Berkeley) 9/15/88";
#endif /* not lint */

#include "indent_globs.h"
#include <ctype.h>
/* POSIX says that fcntl.h should exist.  Linking either sys/fcntl.h
   or sys/file.h to fcntl.h should work fine if you don't have fcntl.h */
#include <fcntl.h>

#include <sys/types.h>
#include <sys/stat.h>

int suppress_blanklines = 0;
int         comment_open;

int paren_target;

/* true if INDENT OFF is in effect */
static int inhibit_formatting;

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,
                target_col;
    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";
    }
    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 if (!inhibit_formatting) {
	suppress_blanklines = 0;
	parser_state_tos->bl_line = false;
	if (prefix_blankline_requested && not_first_line)
	    if (swallow_optional_blanklines) {
		if (n_real_blanklines == 1)
		    n_real_blanklines = 0;
	    }
	    else {
		if (n_real_blanklines == 0)
		    n_real_blanklines = 1;
	    }
	while (--n_real_blanklines >= 0)
	    putc('\n', 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] == '\t'))
		e_lab--;
	    cur_col = pad_output(1, compute_label_target());
	    fprintf(output, "%.*s", e_lab - s_lab, s_lab);
	    cur_col = count_spaces(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;

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

		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 (*p == (char) 0200)
		    fprintf(output, "%d", target_col * 7);
		else
		    putc(*p, output);
	    cur_col = count_spaces(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 '\n':
				putc(' ', output);
			    case 1:
				break;
			    case '\\':
				putc('\\', output);
			    default:
				putc(*follow, output);
			    }
			    follow++;
			}
			putc(1, output);
		    }
		    fprintf(output, "\n./* %dp %d %dp\n",
			    parser_state_tos->com_col * 7,
			    (s_code != e_code || s_lab != e_lab) - parser_state_tos->box_com,
			    target_col * 7);
		}
		comment_open = 1 + parser_state_tos->box_com;
		while (*p) {
		    if (*p == BACKSLASH)
			putc(BACKSLASH, output);
		    putc(*p++, output);
		}
	    }
	    else {		/* print comment, if any */
		register    target = parser_state_tos->com_col;
		register char *com_st = s_com;

		target += parser_state_tos->comment_delta;
		while (*com_st == '\t')
		    com_st++, target += 8;	/* ? */
		while (target <= 0)
		    if (*com_st == ' ')
			target++, com_st++;
		    else if (*com_st == '\t')
			target = ((target - 1) & ~7) + 9, com_st++;
		    else
			target = 1;
		if (cur_col > target) {	/* if comment cant fit on this line,
					 * put it on next line */
		    putc('\n', output);
		    cur_col = 1;
		    ++parser_state_tos->out_lines;
		}
		while (e_com > com_st && isspace(e_com[-1]))
		    e_com--;
		cur_col = pad_output(cur_col, target);
		if (!parser_state_tos->box_com) {
		    if (star_comment_cont && (com_st[1] != '*' || e_com <= com_st + 1))
			if (com_st[1] == ' ' && com_st[0] == ' ' && e_com > com_st + 1)
			    com_st[1] = '*';
			else
			    fwrite(" * ", com_st[0] == '\t' ? 2 : com_st[0] == '*' ? 1 : 3, 1, output);
		}
		fwrite(com_st, e_com - com_st, 1, output);
		parser_state_tos->comment_delta = parser_state_tos->n_comment_delta;
		cur_col = count_spaces(cur_col, com_st);
		++parser_state_tos->com_lines;	/* count lines with comments */
	    }
	  }
	if (parser_state_tos->use_ff)
	  {
	    putc('\014', output);
	    parser_state_tos->use_ff = false;
	  }
	else
	    putc('\n', output);
inhibit_newline:
	++parser_state_tos->out_lines;
	if (parser_state_tos->just_saw_decl == 1 && blanklines_after_declarations) {
	    prefix_blankline_requested = 1;
	    parser_state_tos->just_saw_decl = 0;
	}
	else
	    prefix_blankline_requested = postfix_blankline_requested;
	postfix_blankline_requested = 0;
    }
    parser_state_tos->decl_on_line = parser_state_tos->in_decl;	/* if we are in the middle of a
					 * declaration, remember that fact for
					 * proper comment indentation */
    parser_state_tos->ind_stmt = parser_state_tos->in_stmt & ~parser_state_tos->in_decl;	/* next line should be
						 * indented if we have not
						 * completed this stmt and if
						 * we are not in the middle of
						 * a declaration */
    parser_state_tos->dumped_decl_indent = 0;
    *(e_lab = s_lab) = '\0';	/* reset buffers */
    *(e_code = s_code) = '\0';
    *(e_com = s_com) = '\0';
    parser_state_tos->ind_level = parser_state_tos->i_l_follow;
    parser_state_tos->paren_level = parser_state_tos->p_l_follow;
    paren_target = -parser_state_tos->paren_indents[parser_state_tos->paren_level - 1];
    not_first_line = 1;
    return;
};

/* Figure out where we should put the code in codebuf.
   Return the column number in spaces.  */
int
compute_code_target()
{
    register    target_col = parser_state_tos->ind_level + 1;

    if (parser_state_tos->paren_level)
	if (!lineup_to_parens)
	    target_col += continuation_indent * parser_state_tos->paren_level;
	else {
	    register    w;
	    register    t = paren_target;

	    if ((w = count_spaces(t, s_code) - max_col) > 0
		    && count_spaces(target_col, s_code) <= max_col) {
		t -= w + 1;
		if (t > target_col)
		    target_col = t;
	    }
	    else
		target_col = t;
	}
    else if (parser_state_tos->ind_stmt)
	target_col += continuation_indent;
    return target_col;
}

int
compute_label_target()
{
    return
	parser_state_tos->pcase ? case_ind + 1
	: *s_lab == '#' ? 1
	: parser_state_tos->ind_level - label_offset + 1;
}

/* Allocate space for FILENAME, read in the file, and set in_prog and 
   in_prog_pos to point to the buffer.  If any errors occur, report an 
   error message and abort.  */
void
read_file(filename)
     char *filename;
{
  /* File descriptor for the input file */
  int in_fd;

  /* File status for the input file */
  struct stat in_stat;

  /* buffer used for error messages */
  char *errbuf;

  errbuf = (char *)xmalloc (strlen (filename) + 80);
  sprintf(errbuf,"indent: %s",filename);

  in_fd = open(filename,O_RDONLY,0777);
  if (in_fd < 0)
    {
      perror(errbuf);
      exit(1);
    }

  if (fstat(in_fd,&in_stat) < 0)
    {
      perror(errbuf);
      exit(1);
    }
  in_prog_size = in_stat.st_size;
  in_prog = xmalloc(in_prog_size + 3); /* 3 for ' ','\n','\0' */

  if (read(in_fd,in_prog,in_prog_size) < 0)
    {
      perror(errbuf);
      exit(1);
    }

  if (close(in_fd) < 0)
    {
      perror(errbuf);
      exit(1);
    }

  in_prog[in_prog_size] = ' ';
  in_prog[in_prog_size+1] = '\n';
  in_prog[in_prog_size+2] = 0;
  in_prog_pos = in_prog;

  free (errbuf);
}

/* Like read_file but read from stdin.  */
void
read_stdin()
{
  unsigned int alloc_size = 10000;
  char ch;
  unsigned int pos;
  unsigned i;

  in_prog_pos = in_prog = xmalloc(alloc_size);
  in_prog_size = 0;
  do
    {
      /* Copy up until 3 bytes before the end of the buffer,
	 (the 3 is for ' \n\0')...  */
      for (; in_prog_size < alloc_size - 3; in_prog_size++)
	{
	  ch = getc(stdin);
	  if (ch == EOF)
	      break;
	  in_prog[in_prog_size] = ch;
	}
      /* ...and if that's not enough allocate more.  */
      if (ch != EOF) {
	alloc_size *= 2;
	in_prog = xrealloc(in_prog,alloc_size);
      }
    }
  while (ch != EOF);
  
  in_prog[in_prog_size] = ' ';
  in_prog[in_prog_size+1] = '\n';
  in_prog[in_prog_size+2] = 0;
  in_prog_pos = in_prog;  
}

/* Advance buf_ptr so that it points to the next line of input.  Skip 
   over indent errors (comments beginning with *INDENT**), ignoring
   them.  Process INDENT ON and INDENT OFF. (Note: the name of this
   function is a historical artifact from before the time that indent
   kept the whole source file in memory). */

fill_buffer()
{
  /* Point various places in the buffer.  */
  char *p;

  /* Have we found INDENT ON or INDENT OFF ? */
  enum {None,Indent_on,Indent_off} com;
  
  if (bp_save != 0)
    {		/* there is a partly filled input buffer left */
	buf_ptr = bp_save;	/* dont read anything, just switch buffers */
	buf_end = be_save;
	bp_save = be_save = 0;
	if (buf_ptr < buf_end)
	    return;		/* only return if there is really something in
				 * this buffer */
    }

  fill_it:

  cur_line = in_prog_pos;
  buf_ptr = in_prog_pos;
  for (p = buf_ptr; *p && *p++ != '\n';)
    ;
  
  buf_end = p;
  if (!*p)
    had_eof = true;

  p = buf_ptr;
  in_prog_pos = buf_end;
  
  while (*p == ' ' || *p == '\t')
    p++;
  if (*p == '/' && p[1] == '*')
    {
      p += 2;
      if (p[1] == 'I' && strncmp(p,"*INDENT**",9) == 0)
	goto fill_it;
      while (*p == ' ' || *p == '\t')
	p++;
      com = None;
      if (p[0] == 'I' && p[1] == 'N' && p[2] == 'D' && p[3] == 'E'
			&& p[4] == 'N' && p[5] == 'T') {
		    p += 6;
		    while (*p == ' ' || *p == '\t')
			p++;
		    if (*p == '*')
			com = 1;
		    else if (*p == 'O')
			if (*++p == 'N')
			    p++, com = Indent_on;
			else if (*p == 'F' && *++p == 'F')
			    p++, com = Indent_off;
		    while (*p == ' ' || *p == '\t')
			p++;
		    if (p[0] == '*' && p[1] == '/' && p[2] == '\n' && com) {
			if (s_com != e_com || s_lab != e_lab || s_code != e_code)
			    dump_line();
			if (!(inhibit_formatting = com - 1)) {
			    n_real_blanklines = 0;
			    postfix_blankline_requested = 0;
			    prefix_blankline_requested = 0;
			    suppress_blanklines = 1;
			}
		    }
		  }
    }
  if (inhibit_formatting)
    {
      p = buf_ptr;
      do
	putc(*p,output);
      while (*p++ != '\n');
    }
      
}
  
	  
  
/*
 * Copyright (C) 1976 by the Board of Trustees of the University of Illinois
 * 
 * All rights reserved
 * 
 * 
 * NAME: pad_output
 * 
 * FUNCTION: Writes tabs and spaces to move the current column up to the desired
 * position.
 * 
 * ALGORITHM: Put tabs and/or blanks into pobuf, then write pobuf.
 * 
 * PARAMETERS: current		integer		The current column target
 * nteger		The desired column
 * 
 * RETURNS: Integer value of the new column.  (If current >= target, no action is
 * taken, and current is returned.
 * 
 * GLOBALS: None
 * 
 * CALLS: write (sys)
 * 
 * CALLED BY: dump_line
 * 
 * HISTORY: initial coding 	November 1976	D A Willcox of CAC
 * 
 */
pad_output(current, target)	/* writes tabs and blanks (if necessary) to
				 * get the current output position up to the
				 * target column */
    int         current;	/* the current column value */
    int         target;		/* position we want it at */
{
    register int curr;		/* internal column pointer */
    register int tcur;

    if (troff)
	fprintf(output, "\\h'|%dp'", (target - 1) * 7);
    else {
	if (current >= target)
	    return (current);	/* line is already long enough */
	curr = current;
	while ((tcur = ((curr - 1) & tabmask) + tabsize + 1) <= target) {
	    putc('\t', output);
	    curr = tcur;
	}
	while (curr++ < target)
	    putc(' ', output);	/* pad with final blanks */
    }
    return (target);
};

/*
 * Copyright (C) 1976 by the Board of Trustees of the University of Illinois
 * 
 * All rights reserved
 * 
 * 
 * NAME: count_spaces
 * 
 * FUNCTION: Find out where printing of a given string will leave the current
 * character position on output.
 * 
 * ALGORITHM: Run thru input string and add appropriate values to current
 * position.
 * 
 * RETURNS: Integer value of position after printing "buffer" starting in column
 * "current".
 * 
 * HISTORY: initial coding 	November 1976	D A Willcox of CAC
 * 
 */
int
count_spaces(current, buffer)
/*
 * this routine figures out where the character position will be after
 * printing the text in buffer starting at column "current"
 */
    int         current;
    char       *buffer;
{
    register char *buf;		/* used to look thru buffer */
    register int cur;		/* current character counter */

    cur = current;

    for (buf = buffer; *buf != '\0'; ++buf) {
	switch (*buf) {

	case '\n':
	case 014:		/* form feed */
	    cur = 1;
	    break;

	case '\t':
	    cur = ((cur - 1) & tabmask) + tabsize + 1;
	    break;

	case '':		/* this is a backspace */
	    --cur;
	    break;

	default:
	    ++cur;
	    break;
	}			/* end of switch */
    }				/* end of for loop */
    return (cur);
};

/* Nonzero if we have found an error (not a warning).  */
int	found_err;

/* Signal an error.  LEVEL is nonzero if it is an error (as opposed to 
   a warning.  MSG is a printf-style format string.  Additional 
   arguments are additional arguments for printf.  */
diag(level, msg, a, b)
{
    if (level)
	found_err = 1;
    if (output == stdout) {
	fprintf(stdout, "/**INDENT** %s@%d: ", level == 0 ? "Warning" : "Error", line_no);
	fprintf(stdout, msg, a, b);
	fprintf(stdout, " */\n");
    }
    else {
	fprintf(stderr, "%s: %d: ", in_name, line_no);
	fprintf(stderr, msg, a, b);
	fprintf(stderr, "\n");
    }
}

writefdef(f, nm)
    register struct fstate *f;
{
    fprintf(output, ".ds f%c %s\n.nr s%c %d\n",
	    nm, f->font, nm, f->size);
}

/* Write characters starting at S to change the font from OF to NF.  Return
   a pointer to the character after the last character written.
   For troff mode only.  */
char *
chfont(of, nf, s)
    register struct fstate *of,
               *nf;
    char       *s;
{
    if (of->font[0] != nf->font[0]
	    || of->font[1] != nf->font[1]) {
	*s++ = '\\';
	*s++ = 'f';
	if (nf->font[1]) {
	    *s++ = '(';
	    *s++ = nf->font[0];
	    *s++ = nf->font[1];
	}
	else
	    *s++ = nf->font[0];
    }
    if (nf->size != of->size) {
	*s++ = '\\';
	*s++ = 's';
	if (nf->size < of->size) {
	    *s++ = '-';
	    *s++ = '0' + of->size - nf->size;
	}
	else {
	    *s++ = '+';
	    *s++ = '0' + nf->size - of->size;
	}
    }
    return s;
}


parsefont(f, s0)
    register struct fstate *f;
    char       *s0;
{
    register char *s = s0;
    int         sizedelta = 0;
    int i;
    
    f->size = 0;
    f->allcaps = 1;
    for (i = 0; i < 4; i++)
      f->font[i] = 0;
    
    while (*s) {
	if (isdigit(*s))
	    f->size = f->size * 10 + *s - '0';
	else if (isupper(*s))
	    if (f->font[0])
		f->font[1] = *s;
	    else
		f->font[0] = *s;
	else if (*s == 'c')
	    f->allcaps = 1;
	else if (*s == '+')
	    sizedelta++;
	else if (*s == '-')
	    sizedelta--;
	else {
	    fprintf(stderr, "indent: bad font specification: %s\n", s0);
	    exit(1);
	}
	s++;
    }
    if (f->font[0] == 0)
	f->font[0] = 'R';
    if (bodyf.size == 0)
	bodyf.size = 11;
    if (f->size == 0)
	f->size = bodyf.size + sizedelta;
    else if (sizedelta > 0)
	f->size += bodyf.size;
    else
	f->size = bodyf.size - f->size;
}