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The Datafile PD-CD 4
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pr_comment
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1995-10-27
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12KB
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422 lines
/*
* Copyright (c) 1985 Sun Microsystems, Inc.
* Copyright (c) 1980 The Regents of the University of California.
* Copyright (c) 1976 Board of Trustees of the University of Illinois.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley, the University of Illinois,
* Urbana, and Sun Microsystems, Inc. The name of either University
* or Sun Microsystems may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/* Archimedes port by Steven Flintham
Wednesday 25th October 1995
Friday 27th October 1995 */
#ifndef lint
static char sccsid[] = "@(#)pr_comment.c 5.9 (Berkeley) 9/15/88";
#endif /* not lint */
/*
* NAME:
* pr_comment
*
* FUNCTION:
* This routine takes care of scanning and printing comments.
*
* ALGORITHM:
* 1) Decide where the comment should be aligned, and if lines should
* be broken.
* 2) If lines should not be broken and filled, just copy up to end of
* comment.
* 3) If lines should be filled, then scan thru input_buffer copying
* characters to com_buf. Remember where the last blank, tab, or
* newline was. When line is filled, print up to last blank and
* continue copying.
*
* HISTORY:
* November 1976 D A Willcox of CAC Initial coding
* 12/6/76 D A Willcox of CAC Modification to handle
* UNIX-style comments
*
*/
/*
* this routine processes comments. It makes an attempt to keep comments from
* going over the max line length. If a line is too long, it moves everything
* from the last blank to the next comment line. Blanks and tabs from the
* beginning of the input line are removed
*/
#ifndef __riscos /* SF */
#include "indent_globs.h"
#else
#include "indntglobs.h"
#endif /* __riscos */
pr_comment()
{
int now_col; /* column we are in now */
int adj_max_col; /* Adjusted max_col for when we decide to
* spill comments over the right margin */
char *last_bl; /* points to the last blank in the output
* buffer */
char *t_ptr; /* used for moving string */
int unix_comment; /* tri-state variable used to decide if it is
* a unix-style comment. 0 means only blanks
* since /*, 1 means regular style comment, 2
* means unix style comment */
int break_delim = comment_delimiter_on_blankline;
int l_just_saw_decl = ps.just_saw_decl;
/*
* int ps.last_nl = 0; /* true iff the last significant thing
* weve seen is a newline
*/
int one_liner = 1; /* true iff this comment is a one-liner */
adj_max_col = max_col;
ps.just_saw_decl = 0;
last_bl = 0; /* no blanks found so far */
ps.box_com = false; /* at first, assume that we are not in
* a boxed comment or some other
* comment that should not be touched */
++ps.out_coms; /* keep track of number of comments */
unix_comment = 1; /* set flag to let us figure out if there is a
* unix-style comment ** DISABLED: use 0 to
* reenable this hack! */
/* Figure where to align and how to treat the comment */
if (ps.col_1 && !format_col1_comments) { /* if comment starts in column
* 1 it should not be touched */
ps.box_com = true;
ps.com_col = 1;
}
else {
if (*buf_ptr == '-' || *buf_ptr == '*') {
ps.box_com = true; /* a comment with a '-' or '*' immediately
* after the /* is assumed to be a boxed
* comment */
break_delim = 0;
}
if ( /* ps.bl_line && */ (s_lab == e_lab) && (s_code == e_code)) {
/* klg: check only if this line is blank */
/*
* If this (*and previous lines are*) blank, dont put comment way
* out at left
*/
ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
adj_max_col = block_comment_max_col;
if (ps.com_col <= 1)
ps.com_col = 1 + !format_col1_comments;
}
else {
register target_col;
break_delim = 0;
if (s_code != e_code)
target_col = count_spaces(compute_code_target(), s_code);
else {
target_col = 1;
if (s_lab != e_lab)
target_col = count_spaces(compute_label_target(), s_lab);
}
ps.com_col = ps.decl_on_line || ps.ind_level == 0 ? ps.decl_com_ind : ps.com_ind;
if (ps.com_col < target_col)
ps.com_col = ((target_col + 7) & ~7) + 1;
if (ps.com_col + 24 > adj_max_col)
adj_max_col = ps.com_col + 24;
}
}
if (ps.box_com) {
buf_ptr[-2] = 0;
ps.n_comment_delta = 1 - count_spaces(1, in_buffer);
buf_ptr[-2] = '/';
}
else {
ps.n_comment_delta = 0;
while (*buf_ptr == ' ' || *buf_ptr == '\t')
buf_ptr++;
}
ps.comment_delta = 0;
*e_com++ = '/'; /* put '/*' into buffer */
if (ps.cc_comment) /* (or '//') */
*e_com++ = '/';
else
*e_com++ = '*';
if (*buf_ptr != ' ' && !ps.box_com)
*e_com++ = ' ';
*e_com = '\0';
if (troff) {
now_col = 1;
adj_max_col = 80;
}
else
now_col = count_spaces(ps.com_col, s_com); /* figure what column we
* would be in if we
* printed the comment
* now */
/* Start to copy the comment */
while (1) { /* this loop will go until the comment is
* copied */
if (*buf_ptr >= 040 && *buf_ptr != '*')
ps.last_nl = 0;
check_size(com);
switch (*buf_ptr) { /* this checks for various spcl cases */
case 014: /* check for a form feed */
if (!ps.box_com) { /* in a text comment, break the line here */
ps.use_ff = true;
/* fix so dump_line uses a form feed */
dump_line();
last_bl = 0;
*e_com++ = ' ';
*e_com++ = '*';
*e_com++ = ' ';
while (*++buf_ptr == ' ' || *buf_ptr == '\t');
}
else {
if (++buf_ptr >= buf_end)
fill_buffer();
*e_com++ = 014;
}
break;
case '\n':
if (ps.cc_comment) {
*e_com = '\0';
dump_line();
ps.cc_comment = 0;
ps.just_saw_decl = l_just_saw_decl; /* ?? */
if (++buf_ptr >= buf_end) /* eat '\n' */
fill_buffer();
return;
}
if (had_eof) { /* check for unexpected eof */
printf("Unterminated comment\n");
*e_com = '\0';
dump_line();
return;
}
one_liner = 0;
if (ps.box_com || ps.last_nl) { /* if this is a boxed comment,
* we dont ignore the newline */
if (s_com == e_com) {
*e_com++ = ' ';
*e_com++ = ' ';
}
*e_com = '\0';
if (!ps.box_com && e_com - s_com > 3) {
if (break_delim == 1 && s_com[0] == '/'
&& s_com[1] == '*' && s_com[2] == ' ') {
char *t = e_com;
break_delim = 2;
e_com = s_com + 2;
*e_com = 0;
if (blanklines_before_blockcomments)
prefix_blankline_requested = 1;
dump_line();
e_com = t;
s_com[0] = s_com[1] = s_com[2] = ' ';
}
dump_line();
check_size(com);
*e_com++ = ' ';
*e_com++ = ' ';
}
dump_line();
now_col = ps.com_col;
}
else {
ps.last_nl = 1;
if (unix_comment != 1) { /* we not are in unix_style
* comment */
if (unix_comment == 0 && s_code == e_code) {
/*
* if it is a UNIX-style comment, ignore the
* requirement that previous line be blank for
* unindention
*/
ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
if (ps.com_col <= 1)
ps.com_col = 2;
}
unix_comment = 2; /* permanently remember that we are in
* this type of comment */
dump_line();
++line_no;
now_col = ps.com_col;
*e_com++ = ' ';
/*
* fix so that the star at the start of the line will line
* up
*/
do /* flush leading white space */
if (++buf_ptr >= buf_end)
fill_buffer();
while (*buf_ptr == ' ' || *