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- #
- /*
-
- Copyright (C) 1976
- by the
- Board of Trustees
- of the
- University of Illinois
-
- All rights reserved
-
-
- 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.
-
- PARAMETERS:
- None
-
- RETURNS:
- Nothing
-
- GLOBALS:
- combuf =
- s_com
- e_com =
-
- buf_ptr =
- buf_end
-
- bl_line
- col_1
- com_col =
- com_ind
- decl_com_ind
- decl_on_line
- had_eof
- ind_level
- ind_size
- line_no =
- max_col
- out_com = Count number of comments
- unindent_displace
- use_ff =
-
- CALLS:
- count_spaces
- dump_line
- fill_buffer
- printf (lib)
-
- CALLED BY:
- main
-
- 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 */
-
- #include "indntglo.h";
-
-
- pr_comment () {
- int now_col;
- /* column we are in now */
- int box_com;
- /* set to true when we are in a "boxed" comment. In that case, the first
- non-blank char should be lined up with the / in /* */
- int col_1_com;
- /* this comment should not be touched */
- char *last_bl;
- /* points to the last blank in the output buffer */
- char achar;
- char *t_ptr; /* used for movinf 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 */
-
-
- last_bl = 0; /* no blanks found so far */
- box_com = col_1_com = false;
- /* at first, assume that we are not in a boxed comment or some other comment
- that should not be touched */
- ++out_coms; /* keep track of number of comments */
- unix_comment = 0; /* set flag to let us figure out if there is a
- unix-style comment */
-
- /*----------------------------------------------------------*\
- | Figure where to align and how to treat the comment
- \*----------------------------------------------------------*/
-
- if (col_1) { /* if comment starts in column 1 it should not
- be touched */
- col_1_com = box_com = true;
- com_col = 1;
- }
- else {
- if (*buf_ptr == '-')
- box_com = true; /* a comment with a '-' immediately after the /*
- is assumed to be a boxed comment */
- if ( /* 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,
- * don't put comment way out at left
- */
- com_col = (ind_level - unindent_displace) * ind_size + 1;
- if (com_col <= 1)
- com_col = 2;
- }
- else {
- com_col = (decl_on_line || ind_level == 0 ? decl_com_ind : com_ind);
- }
- }
-
- *e_com++ = '/'; /* put '/*' into buffer */
- *e_com++ = '*';
- if (*buf_ptr != ' ' && !box_com)
- *e_com++ = ' ';
-
- *e_com = '\0';
- now_col = count_spaces (com_col, s_com);
- /* figure where 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
- */
- switch (*buf_ptr) { /* this checks for various spcl cases */
- case 014: /* check for a form feed */
- if (!box_com) {/* in a text comment, break the line here */
- use_ff = true;
- /* fix so dump_line uses a form feed */
- dump_line ();
- last_bl = 0;
- *e_com++ = ' ';
- *e_com++ = ' ';
- *e_com++ = ' ';
- do { /* get rid of leading blanks */
- if (++buf_ptr >= buf_end)
- fill_buffer ();
- } while (*buf_ptr == ' ' || *buf_ptr == '\t');
- }
- else {
- if (++buf_ptr >= buf_end)
- fill_buffer ();
- *e_com++ = 014;
- }
-
- break;
-
- case '\n':
- if (had_eof) { /* check for unexpected eof */
- printf ("Unterminated comment\n");
- *e_com = '\0';
- dump_line ();
- return;
- }
-
- if (box_com) { /* if this is a boxed comment, we don't ignore
- the newline */
- *e_com = '\0';
- dump_line ();
- ++line_no;
- now_col = com_col;
-
- if (!col_1_com) {
- /* if merely a boxed comment, we should line up first
- non-blank character */
- do { /* flush leading non-blanks */
- if (++buf_ptr >= buf_end)
- fill_buffer ();
- } while (*buf_ptr == ' ' || *buf_ptr == '\t');
- }
- else { /* make sure we at least flush the blank */
- if (++buf_ptr >= buf_end)
- fill_buffer ();
- }
-
- break;
- }
-
- if (unix_comment != 1) {
- /* we are in unix_style comment */
- if (unix_comment == 0 && s_code == e_code) {
- /* if it is a UNIX-style comment, ignore the requirement
- that pervious line be blank for unindention */
- com_col = (ind_level - unindent_displace) * ind_size + 1;
- if (com_col <= 1)
- com_col = 2;
- }
-
- unix_comment = 2;
- /* permanently remember that we are in this type of comment */
- dump_line ();
- ++line_no;
- now_col = 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 == ' ' || *buf_ptr == '\t');
- break;
- }
-
- if (*(e_com - 1) == ' ' || *(e_com - 1) == '\t')
- last_bl = e_com - 1;
- /* if there was a space at the end of the last line, remember where
- it was */
- else { /* otherwise, insert one */
- last_bl = e_com;
- *e_com++ = ' ';
- ++now_col;
- }
-
- ++line_no; /* keep track of input line number */
- do { /* copy any blanks and/or tabs at start of next
- line */
- if (++buf_ptr >= buf_end)
- fill_buffer ();
- } while (*buf_ptr == ' ' || *buf_ptr == '\t');
-
- break; /* end of case for newline */
-
- case '*': /* must check for possibility of being at end of
- comment */
- if (++buf_ptr >= buf_end)
- /* get to next char after * */
- fill_buffer ();
-
- if (unix_comment == 0)
- /* set flag to show we are not in unix-style
- comment */
- unix_comment = 1;
-
- if (*buf_ptr == '/') {
- /* it is the end!!! */
- if (++buf_ptr >= buf_end)
- fill_buffer ();
-
- if (*(e_com - 1) != ' ' && !box_com) {
- /* insure blank before end */
- *e_com++ = ' ';
- ++now_col;
- }
-
- if (now_col > max_col - 2 && !box_com) {
- /* check if star-slash will go over line */
- *e_com = '\0';
- /* it will */
- dump_line ();
- now_col = com_col;
- }
-
- *e_com++ = '*';
- /* move end of comment */
- *e_com++ = '/';
- *e_com = '\0';
- return; /* we is done */
- } /* end of end of comment */
-
-
- else { /* handle isolated '*' */
- *e_com++ = '*';
- ++now_col;
- break;
- }
- /* end of processing of * */
-
- default: /* we have a random char */
- if (unix_comment == 0 && *buf_ptr != ' ' && *buf_ptr != '\t')
- unix_comment = 1;
- /* we are not in unix-style comment */
-
- *e_com = *buf_ptr++;
- if (buf_ptr >= buf_end)
- fill_buffer ();
-
- if (*e_com == '\t')
- /* keep track of column */
- now_col = ((now_col - 1) & tabmask) + tabsize + 1;
- else
- if (*e_com == '')
- /* this is a backspace */
- --now_col;
- else
- ++now_col;
-
- if (*e_com == ' ' || *e_com == '\t')
- last_bl = e_com;
- /* remember we saw a blank */
-
- ++e_com;
- if (now_col > max_col && !box_com && unix_comment == 1) {
- /* the comment is too long, it must be broken up */
- if (last_bl == 0) {
- /* we have seen no blanks */
- printf ("%d: Comment too long\n", line_no);
- last_bl = e_com;
- /* fake it */
- *e_com++ = ' ';
- }
-
- *e_com = '\0';
- /* print what we have */
- *last_bl = '\0';
- e_com = last_bl;
- dump_line ();
-
- *e_com++ = ' ';
- /* add blanks for continuation */
- *e_com++ = ' ';
- *e_com++ = ' ';
-
- t_ptr = last_bl + 1;
- last_bl = 0;
- while (*t_ptr != '\0') {
- /* move unprinted pare of comment down in buffer */
- if (*t_ptr == ' ' || *t_ptr == '\t')
- last_bl = e_com;
- *e_com++ = *t_ptr++;
- }
-
- *e_com = '\0';
- now_col = count_spaces (com_col, s_com);
- /* recompute current position */
- } /* end of code for splitting a comment */
- break; /* end of default case */
-
-
- } /* end of switch */
-
- } /* end of while (1) */
- } /* end of pr_comment */
-