+static char sccsid[] = "@(#)pr_comment.c 4.1 (Berkeley) %G%";
+
+/*
+
+ 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
+
+*/\f
+
+/* 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 "indent_globs.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 == '\b')
+ /* 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 */
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