355 lines
11 KiB
C
355 lines
11 KiB
C
/*-
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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. 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 "c.h"
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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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if (s_lab != e_lab && s_lab[1] == 'e' &&
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(strncmp(s_lab, "#endif", 6) == 0 ||
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strncmp(s_lab, "#else", 5) == 0))
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ps.com_col = else_endif_com_ind <= target_col
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? target_col + 1 : else_endif_com_ind;
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else
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ps.com_col = ps.decl_on_line || ps.ind_level == 0
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? 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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