9de29bfb5a
Rewrite the macros so that they take a parameter. Consumers use it to signal how much room in the buffer they need; this lets them do that once when required space is known instead of doing the check once every loop step. Also take the parameter value into consideration when resizing the buffer; the requested space may be larger than the constant 400 bytes that the previous version used - now it's the sum of those two values. On the consumer side, don't copy strings byte by byte - use memcpy(). Deduplicate code that copied base 2, base 8 and base 16 literals. Don't advance the e_token pointer once the token has been copied into s_token. This allows easy calculation of the token's length.
355 lines
11 KiB
C
355 lines
11 KiB
C
/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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* Copyright (c) 1985 Sun Microsystems, Inc.
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)pr_comment.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "indent_globs.h"
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#include "indent_codes.h"
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#include "indent.h"
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/*
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* NAME:
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* pr_comment
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*
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* FUNCTION:
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* This routine takes care of scanning and printing comments.
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*
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* ALGORITHM:
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* 1) Decide where the comment should be aligned, and if lines should
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* be broken.
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* 2) If lines should not be broken and filled, just copy up to end of
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* comment.
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* 3) If lines should be filled, then scan thru input_buffer copying
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* characters to com_buf. Remember where the last blank, tab, or
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* newline was. When line is filled, print up to last blank and
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* continue copying.
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*
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* HISTORY:
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* November 1976 D A Willcox of CAC Initial coding
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* 12/6/76 D A Willcox of CAC Modification to handle
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* UNIX-style comments
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*
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*/
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/*
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* this routine processes comments. It makes an attempt to keep comments from
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* going over the max line length. If a line is too long, it moves everything
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* from the last blank to the next comment line. Blanks and tabs from the
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* beginning of the input line are removed
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*/
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void
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pr_comment(void)
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{
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int now_col; /* column we are in now */
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int adj_max_col; /* Adjusted max_col for when we decide to
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* spill comments over the right margin */
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char *last_bl; /* points to the last blank in the output
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* buffer */
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char *t_ptr; /* used for moving string */
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int break_delim = comment_delimiter_on_blankline;
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int l_just_saw_decl = ps.just_saw_decl;
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adj_max_col = max_col;
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ps.just_saw_decl = 0;
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last_bl = NULL; /* no blanks found so far */
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ps.box_com = false; /* at first, assume that we are not in
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* a boxed comment or some other
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* comment that should not be touched */
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++ps.out_coms; /* keep track of number of comments */
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/* Figure where to align and how to treat the comment */
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if (ps.col_1 && !format_col1_comments) { /* if comment starts in column
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* 1 it should not be touched */
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ps.box_com = true;
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break_delim = false;
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ps.com_col = 1;
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}
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else {
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if (*buf_ptr == '-' || *buf_ptr == '*' ||
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(*buf_ptr == '\n' && !format_block_comments)) {
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ps.box_com = true; /* A comment with a '-' or '*' immediately
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* after the /+* is assumed to be a boxed
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* comment. A comment with a newline
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* immediately after the /+* is assumed to
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* be a block comment and is treated as a
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* box comment unless format_block_comments
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* is nonzero (the default). */
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break_delim = false;
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}
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if ( /* ps.bl_line && */ (s_lab == e_lab) && (s_code == e_code)) {
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/* klg: check only if this line is blank */
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/*
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* If this (*and previous lines are*) blank, dont put comment way
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* out at left
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*/
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ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
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adj_max_col = block_comment_max_col;
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if (ps.com_col <= 1)
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ps.com_col = 1 + !format_col1_comments;
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}
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else {
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int target_col;
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break_delim = false;
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if (s_code != e_code)
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target_col = count_spaces(compute_code_target(), s_code);
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else {
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target_col = 1;
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if (s_lab != e_lab)
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target_col = count_spaces(compute_label_target(), s_lab);
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}
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ps.com_col = ps.decl_on_line || ps.ind_level == 0 ? ps.decl_com_ind : ps.com_ind;
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if (ps.com_col <= target_col)
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ps.com_col = tabsize * (1 + (target_col - 1) / tabsize) + 1;
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if (ps.com_col + 24 > adj_max_col)
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adj_max_col = ps.com_col + 24;
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}
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}
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if (ps.box_com) {
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/*
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* Find out how much indentation there was originally, because that
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* much will have to be ignored by pad_output() in dump_line(). This
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* is a box comment, so nothing changes -- not even indentation.
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*
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* The comment we're about to read usually comes from in_buffer,
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* unless it has been copied into save_com.
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*/
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char *start;
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start = buf_ptr >= save_com && buf_ptr < save_com + sc_size ?
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sc_buf : in_buffer;
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ps.n_comment_delta = 1 - count_spaces_until(1, start, buf_ptr - 2);
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}
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else {
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ps.n_comment_delta = 0;
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while (*buf_ptr == ' ' || *buf_ptr == '\t')
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buf_ptr++;
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}
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ps.comment_delta = 0;
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*e_com++ = '/'; /* put '/' followed by '*' into buffer */
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*e_com++ = '*';
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if (*buf_ptr != ' ' && !ps.box_com)
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*e_com++ = ' ';
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/*
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* Don't put a break delimiter if this is a one-liner that won't wrap.
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*/
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if (break_delim)
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for (t_ptr = buf_ptr; *t_ptr != '\0' && *t_ptr != '\n'; t_ptr++) {
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if (t_ptr >= buf_end)
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fill_buffer();
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if (t_ptr[0] == '*' && t_ptr[1] == '/') {
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if (adj_max_col >= count_spaces_until(ps.com_col, buf_ptr, t_ptr + 2))
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break_delim = false;
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break;
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}
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}
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if (break_delim) {
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char *t = e_com;
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e_com = s_com + 2;
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*e_com = 0;
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if (blanklines_before_blockcomments && ps.last_token != lbrace)
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prefix_blankline_requested = 1;
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dump_line();
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e_com = s_com = t;
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if (!ps.box_com && star_comment_cont)
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*e_com++ = ' ', *e_com++ = '*', *e_com++ = ' ';
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}
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/* Start to copy the comment */
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while (1) { /* this loop will go until the comment is
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* copied */
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switch (*buf_ptr) { /* this checks for various spcl cases */
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case 014: /* check for a form feed */
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CHECK_SIZE_COM(3);
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if (!ps.box_com) { /* in a text comment, break the line here */
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ps.use_ff = true;
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/* fix so dump_line uses a form feed */
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dump_line();
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last_bl = NULL;
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if (!ps.box_com && star_comment_cont)
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*e_com++ = ' ', *e_com++ = '*', *e_com++ = ' ';
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while (*++buf_ptr == ' ' || *buf_ptr == '\t')
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;
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}
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else {
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if (++buf_ptr >= buf_end)
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fill_buffer();
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*e_com++ = 014;
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}
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break;
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case '\n':
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if (had_eof) { /* check for unexpected eof */
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printf("Unterminated comment\n");
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dump_line();
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return;
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}
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last_bl = NULL;
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CHECK_SIZE_COM(4);
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if (ps.box_com || ps.last_nl) { /* if this is a boxed comment,
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* we dont ignore the newline */
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if (s_com == e_com)
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*e_com++ = ' ';
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if (!ps.box_com && e_com - s_com > 3) {
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dump_line();
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if (star_comment_cont)
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*e_com++ = ' ', *e_com++ = '*', *e_com++ = ' ';
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}
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dump_line();
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if (!ps.box_com && star_comment_cont)
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*e_com++ = ' ', *e_com++ = '*', *e_com++ = ' ';
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}
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else {
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ps.last_nl = 1;
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if (*(e_com - 1) == ' ' || *(e_com - 1) == '\t')
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last_bl = e_com - 1;
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/*
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* if there was a space at the end of the last line, remember
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* where it was
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*/
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else { /* otherwise, insert one */
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last_bl = e_com;
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*e_com++ = ' ';
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}
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}
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++line_no; /* keep track of input line number */
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if (!ps.box_com) {
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int nstar = 1;
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do { /* flush any blanks and/or tabs at start of
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* next line */
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if (++buf_ptr >= buf_end)
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fill_buffer();
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if (*buf_ptr == '*' && --nstar >= 0) {
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if (++buf_ptr >= buf_end)
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fill_buffer();
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if (*buf_ptr == '/')
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goto end_of_comment;
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}
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} while (*buf_ptr == ' ' || *buf_ptr == '\t');
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}
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else if (++buf_ptr >= buf_end)
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fill_buffer();
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break; /* end of case for newline */
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case '*': /* must check for possibility of being at end
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* of comment */
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if (++buf_ptr >= buf_end) /* get to next char after * */
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fill_buffer();
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CHECK_SIZE_COM(4);
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if (*buf_ptr == '/') { /* it is the end!!! */
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end_of_comment:
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if (++buf_ptr >= buf_end)
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fill_buffer();
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if (break_delim) {
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if (e_com > s_com + 3) {
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dump_line();
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}
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else
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s_com = e_com;
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*e_com++ = ' ';
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}
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if (e_com[-1] != ' ' && e_com[-1] != '\t' && !ps.box_com)
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*e_com++ = ' '; /* ensure blank before end */
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*e_com++ = '*', *e_com++ = '/', *e_com = '\0';
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ps.just_saw_decl = l_just_saw_decl;
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return;
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}
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else /* handle isolated '*' */
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*e_com++ = '*';
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break;
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default: /* we have a random char */
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now_col = count_spaces_until(ps.com_col, s_com, e_com);
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do {
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CHECK_SIZE_COM(1);
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*e_com = *buf_ptr++;
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if (buf_ptr >= buf_end)
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fill_buffer();
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if (*e_com == ' ' || *e_com == '\t')
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last_bl = e_com; /* remember we saw a blank */
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++e_com;
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now_col++;
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} while (!memchr("*\n\r\b\t", *buf_ptr, 6) &&
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(now_col <= adj_max_col || !last_bl));
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ps.last_nl = false;
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if (now_col > adj_max_col && !ps.box_com && e_com[-1] > ' ') {
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/*
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* the comment is too long, it must be broken up
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*/
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if (last_bl == NULL) {
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dump_line();
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if (!ps.box_com && star_comment_cont)
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*e_com++ = ' ', *e_com++ = '*', *e_com++ = ' ';
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break;
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}
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*e_com = '\0';
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e_com = last_bl;
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dump_line();
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if (!ps.box_com && star_comment_cont)
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*e_com++ = ' ', *e_com++ = '*', *e_com++ = ' ';
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for (t_ptr = last_bl + 1; *t_ptr == ' ' || *t_ptr == '\t';
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t_ptr++)
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;
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last_bl = NULL;
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/*
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* t_ptr will be somewhere between e_com (dump_line() reset)
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* and l_com. So it's safe to copy byte by byte from t_ptr
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* to e_com without any CHECK_SIZE_COM().
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*/
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while (*t_ptr != '\0') {
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if (*t_ptr == ' ' || *t_ptr == '\t')
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last_bl = e_com;
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*e_com++ = *t_ptr++;
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}
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}
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break;
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}
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}
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}
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