426 lines
13 KiB
C
426 lines
13 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. 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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#ifndef lint
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static char sccsid[] = "@(#)pr_comment.c 8.1 (Berkeley) 6/6/93";
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <stdio.h>
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#include <stdlib.h>
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#include "indent_globs.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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pr_comment()
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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 unix_comment; /* tri-state variable used to decide if it is
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* a unix-style comment. 0 means only blanks
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* since /*, 1 means regular style comment, 2
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* means unix style comment */
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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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/*
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* int ps.last_nl = 0; /* true iff the last significant thing
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* weve seen is a newline
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*/
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int one_liner = 1; /* true iff this comment is a one-liner */
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adj_max_col = max_col;
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ps.just_saw_decl = 0;
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last_bl = 0; /* 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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unix_comment = 1; /* set flag to let us figure out if there is a
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* unix-style comment ** DISABLED: use 0 to
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* reenable this hack! */
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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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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 = 0;
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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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register target_col;
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break_delim = 0;
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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 = ((target_col + 7) & ~7) + 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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buf_ptr[-2] = 0;
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ps.n_comment_delta = 1 - count_spaces(1, in_buffer);
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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 '/*' 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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*e_com = '\0';
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if (troff) {
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now_col = 1;
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adj_max_col = 80;
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}
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else
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now_col = count_spaces(ps.com_col, s_com); /* figure what column we
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* would be in if we
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* printed the comment
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* now */
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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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if (*buf_ptr > 040 && *buf_ptr != '*')
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ps.last_nl = 0;
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CHECK_SIZE_COM;
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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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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 = 0;
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*e_com++ = ' ';
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*e_com++ = '*';
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*e_com++ = ' ';
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while (*++buf_ptr == ' ' || *buf_ptr == '\t');
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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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*e_com = '\0';
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dump_line();
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return;
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}
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one_liner = 0;
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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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*e_com++ = ' ';
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}
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*e_com = '\0';
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if (!ps.box_com && e_com - s_com > 3) {
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if (break_delim == 1 && s_com[0] == '/'
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&& s_com[1] == '*' && s_com[2] == ' ') {
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char *t = e_com;
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break_delim = 2;
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e_com = s_com + 2;
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*e_com = 0;
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if (blanklines_before_blockcomments)
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prefix_blankline_requested = 1;
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dump_line();
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e_com = t;
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s_com[0] = s_com[1] = s_com[2] = ' ';
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}
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dump_line();
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CHECK_SIZE_COM;
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*e_com++ = ' ';
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*e_com++ = ' ';
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}
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dump_line();
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now_col = ps.com_col;
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}
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else {
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ps.last_nl = 1;
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if (unix_comment != 1) { /* we not are in unix_style
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* comment */
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if (unix_comment == 0 && s_code == e_code) {
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/*
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* if it is a UNIX-style comment, ignore the
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* requirement that previous line be blank for
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* unindention
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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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if (ps.com_col <= 1)
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ps.com_col = 2;
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}
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unix_comment = 2; /* permanently remember that we are in
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* this type of comment */
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dump_line();
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++line_no;
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now_col = ps.com_col;
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*e_com++ = ' ';
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/*
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* fix so that the star at the start of the line will line
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* up
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*/
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do /* flush leading white space */
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if (++buf_ptr >= buf_end)
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fill_buffer();
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while (*buf_ptr == ' ' || *buf_ptr == '\t');
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break;
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}
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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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CHECK_SIZE_COM;
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*e_com++ = ' ';
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++now_col;
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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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if (unix_comment == 0) /* set flag to show we are not in
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* unix-style comment */
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unix_comment = 1;
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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 (*(e_com - 1) != ' ' && !ps.box_com) { /* insure blank before
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* end */
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*e_com++ = ' ';
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++now_col;
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}
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if (break_delim == 1 && !one_liner && s_com[0] == '/'
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&& s_com[1] == '*' && s_com[2] == ' ') {
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char *t = e_com;
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break_delim = 2;
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e_com = s_com + 2;
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*e_com = 0;
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if (blanklines_before_blockcomments)
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prefix_blankline_requested = 1;
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dump_line();
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e_com = t;
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s_com[0] = s_com[1] = s_com[2] = ' ';
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}
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if (break_delim == 2 && e_com > s_com + 3
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/* now_col > adj_max_col - 2 && !ps.box_com */ ) {
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*e_com = '\0';
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dump_line();
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now_col = ps.com_col;
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}
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CHECK_SIZE_COM;
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*e_com++ = '*';
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*e_com++ = '/';
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*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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++now_col;
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}
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break;
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default: /* we have a random char */
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if (unix_comment == 0 && *buf_ptr != ' ' && *buf_ptr != '\t')
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unix_comment = 1; /* we are not in unix-style comment */
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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 == '\t') /* keep track of column */
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now_col = ((now_col - 1) & tabmask) + tabsize + 1;
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else if (*e_com == '\b') /* this is a backspace */
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--now_col;
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else
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++now_col;
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if (*e_com == ' ' || *e_com == '\t')
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last_bl = e_com;
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/* remember we saw a blank */
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++e_com;
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if (now_col > adj_max_col && !ps.box_com && unix_comment == 1 && 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 (break_delim == 1 && s_com[0] == '/'
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&& s_com[1] == '*' && s_com[2] == ' ') {
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char *t = e_com;
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break_delim = 2;
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e_com = s_com + 2;
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*e_com = 0;
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if (blanklines_before_blockcomments)
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prefix_blankline_requested = 1;
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dump_line();
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e_com = t;
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s_com[0] = s_com[1] = s_com[2] = ' ';
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}
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if (last_bl == 0) { /* we have seen no blanks */
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last_bl = e_com; /* fake it */
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*e_com++ = ' ';
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}
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*e_com = '\0'; /* print what we have */
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*last_bl = '\0';
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while (last_bl > s_com && last_bl[-1] < 040)
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*--last_bl = 0;
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e_com = last_bl;
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dump_line();
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*e_com++ = ' '; /* add blanks for continuation */
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*e_com++ = ' ';
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*e_com++ = ' ';
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t_ptr = last_bl + 1;
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last_bl = 0;
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if (t_ptr >= e_com) {
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while (*t_ptr == ' ' || *t_ptr == '\t')
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t_ptr++;
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while (*t_ptr != '\0') { /* move unprinted part of
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* comment down in buffer */
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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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*e_com = '\0';
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now_col = count_spaces(ps.com_col, s_com); /* recompute current
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* position */
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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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