io.c

早期freebsd实现

/*
 * Copyright (c) 1985 Sun Microsystems, Inc.
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)io.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "indent_globs.h"


int         comment_open;
static      paren_target;

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 (ps.procname[0]) {
	if (troff) {
	    if (comment_open) {
		comment_open = 0;
		fprintf(output, ".*/\n");
	    }
	    fprintf(output, ".Pr \"%s\"\n", ps.procname);
	}
	ps.ind_level = 0;
	ps.procname[0] = 0;
    }
    if (s_code == e_code && s_lab == e_lab && s_com == e_com) {
	if (suppress_blanklines > 0)
	    suppress_blanklines--;
	else {
	    ps.bl_line = true;
	    n_real_blanklines++;
	}
    }
    else if (!inhibit_formatting) {
	suppress_blanklines = 0;
	ps.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 (ps.ind_level == 0)
	    ps.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());
	    if (s_lab[0] == '#' && (strncmp(s_lab, "#else", 5) == 0
				    || strncmp(s_lab, "#endif", 6) == 0)) {
		register char *s = s_lab;
		if (e_lab[-1] == '\n') e_lab--;
		do putc(*s++, output);
		while (s < e_lab && 'a' <= *s && *s<='z');
		while ((*s == ' ' || *s == '\t') && s < e_lab)
		    s++;
		if (s < e_lab)
		    fprintf(output, s[0]=='/' && s[1]=='*' ? "\t%.*s" : "\t/* %.*s */",
			    e_lab - s, s);
	    }
	    else 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 */

	ps.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();
	    {
		register    i;

		for (i = 0; i < ps.p_l_follow; i++)
		    if (ps.paren_indents[i] >= 0)
			ps.paren_indents[i] = -(ps.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 && ps.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",
			    ps.com_col * 7,
			    (s_code != e_code || s_lab != e_lab) - ps.box_com,
			    target_col * 7);
		}
		comment_open = 1 + ps.box_com;
		while (*p) {
		    if (*p == BACKSLASH)
			putc(BACKSLASH, output);
		    putc(*p++, output);
		}
	    }
	    else {		/* print comment, if any */
		register    target = ps.com_col;
		register char *com_st = s_com;

		target += ps.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;
		    ++ps.out_lines;
		}
		while (e_com > com_st && isspace(e_com[-1]))
		    e_com--;
		cur_col = pad_output(cur_col, target);
		if (!ps.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);
		ps.comment_delta = ps.n_comment_delta;
		cur_col = count_spaces(cur_col, com_st);
		++ps.com_lines;	/* count lines with comments */
	    }
	if (ps.use_ff)
	    putc('\014', output);
	else
	    putc('\n', output);
inhibit_newline:
	++ps.out_lines;
	if (ps.just_saw_decl == 1 && blanklines_after_declarations) {
	    prefix_blankline_requested = 1;
	    ps.just_saw_decl = 0;
	}
	else
	    prefix_blankline_requested = postfix_blankline_requested;
	postfix_blankline_requested = 0;
    }
    ps.decl_on_line = ps.in_decl;	/* if we are in the middle of a
					 * declaration, remember that fact for
					 * proper comment indentation */
    ps.ind_stmt = ps.in_stmt & ~ps.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 */
    ps.use_ff = false;
    ps.dumped_decl_indent = 0;
    *(e_lab = s_lab) = '\0';	/* reset buffers */
    *(e_code = s_code) = '\0';
    *(e_com = s_com) = '\0';
    ps.ind_level = ps.i_l_follow;
    ps.paren_level = ps.p_l_follow;
    paren_target = -ps.paren_indents[ps.paren_level - 1];
    not_first_line = 1;
    return;
}

compute_code_target()
{
    register    target_col = ps.ind_size * ps.ind_level + 1;

    if (ps.paren_level)
	if (!lineup_to_parens)
	    target_col += continuation_indent * ps.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 (ps.ind_stmt)
	target_col += continuation_indent;
    return target_col;
}

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