458 lines
13 KiB
C
458 lines
13 KiB
C
/**
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* Copyright (c) 1985 Sun Microsystems, Inc.
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* Copyright (c) 1980 The Regents of the University of California.
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* Copyright (c) 1976 Board of Trustees of the University of Illinois.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley, the University of Illinois,
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* Urbana, and Sun Microsystems, Inc. The name of either University
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* or Sun Microsystems may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/*
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* NAME: pr_comment
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*
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* FUNCTION: This routine takes care of scanning and printing comments.
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*
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* ALGORITHM: 1) Decide where the comment should be aligned, and if lines should
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* be broken. 2) If lines should not be broken and filled, just copy up to
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* end of comment. 3) If lines should be filled, then scan thru input_buffer
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* copying 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 continue
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* copying.
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*
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* HISTORY: November 1976 D A Willcox of CAC Initial coding 12/6/76
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* A Willcox of CAC Modification to handle 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
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* from going over the max line length. If a line is too long, it moves
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* everything from the last blank to the next comment line. Blanks and tabs
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* from the beginning of the input line are removed
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*/
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#define PUBLIC extern
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#include <stdlib.h>
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#include "globs.h"
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#include "proto.h"
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void 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
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* decide to spill comments
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* over the right margin
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*/
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char *last_bl; /* points to the last blank in
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* the output buffer
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*/
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char *t_ptr; /* used for moving string */
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int unix_comment; /* tri-state variable used to
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* decide if it is a unix-style
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* comment. 0 means only blanks
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* since / *, 1 means regular
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* style comment, 2 means unix
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* style comment
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*/
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int break_delim = del_on_bl;
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int l_just_saw_decl = ps.just_saw_decl;
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/* int ps.last_nl = 0; */ /* true iff the last
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sig thing we have seen is a nl */
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int one_liner = 1; /* true iff this comment is a
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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
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not in a boxed comment or
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some other comment that
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should not be touched */
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++ps.out_coms; /* keep track of number of
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comments */
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unix_comment = 1; /* set flag to let us figure
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out if there is a unix-style
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comment ** DISABLED: use 0
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to 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)
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{ /* 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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} else
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{
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if (*buf_ptr == '-' || *buf_ptr == '*')
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{
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ps.box_com = true; /* a comment with a '-' or '*'
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immediately after the / * is
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assumed to be a boxed
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comment */
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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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{
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/* klg: check only if this line is blank */
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/* If this (*and previous lines are*) blank, dont put comment
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way out at left */
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ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
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adj_max_col = bk_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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} else
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{
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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(code_target(), s_code);
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else
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{
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target_col = 1;
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if (s_lab != e_lab)
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target_col = count_spaces(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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{
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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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} else
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{
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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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{
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now_col = 1;
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adj_max_col = 80;
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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)
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{ /* this loop will go until the
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comment is copied */
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if (*buf_ptr > 040 && *buf_ptr != '*')
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ps.last_nl = 0;
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if (e_com >= l_com)
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{
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register nsize = l_com - s_com + 400;
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combuf = (char *) realloc(combuf, nsize);
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e_com = combuf + (e_com - s_com) + 1;
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l_com = combuf + nsize - 5;
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s_com = combuf + 1;
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}
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switch (*buf_ptr)
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{ /* this checks for various spcl
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cases */
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case 014: /* check for a form feed */
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if (!ps.box_com)
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{ /* in a text comment, break the
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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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} else
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{
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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)
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{ /* 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)
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{ /* 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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{
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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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{
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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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{
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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 (bl_bef_bk)
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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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if (e_com >= l_com)
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{
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register nsize = l_com - s_com + 400;
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combuf = (char *) realloc(combuf, nsize);
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e_com = combuf + (e_com - s_com) + 1;
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l_com = combuf + nsize - 5;
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s_com = combuf + 1;
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}
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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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} else
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{
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ps.last_nl = 1;
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if (unix_comment != 1)
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{ /* 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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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
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are in 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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/* fix so that the star at the start of the line will
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line up */
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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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/* if there was a space at the end of the last line,
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remember where it was */
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else
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{ /* otherwise, insert one */
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last_bl = e_com;
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*e_com++ = ' ';
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if (e_com >= l_com)
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{
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register nsize = l_com - s_com + 400;
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combuf = (char *) realloc(combuf, nsize);
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e_com = combuf + (e_com - s_com) + 1;
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l_com = combuf + nsize - 5;
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s_com = combuf + 1;
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}
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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
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number */
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if (!ps.box_com)
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{
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int nstar = 1;
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do
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{ /* flush any blanks and/or tabs
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at start of 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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{
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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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} 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
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of being at end 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
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in unix-style comment */
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unix_comment = 1;
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if (*buf_ptr == '/')
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{ /* 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)
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{ /* insure blank before 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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{
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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 (bl_bef_bk)
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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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{
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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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if (e_com >= l_com)
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{
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register nsize = l_com - s_com + 400;
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combuf = (char *) realloc(combuf, nsize);
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e_com = combuf + (e_com - s_com) + 1;
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l_com = combuf + nsize - 5;
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s_com = combuf + 1;
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}
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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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} else
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{ /* 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
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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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if (break_delim == 1 && s_com[0] == '/'
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&& s_com[1] == '*' && s_com[2] == ' ')
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{
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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 (bl_bef_bk)
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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)
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{ /* 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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{
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while (*t_ptr == ' ' || *t_ptr == '\t')
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t_ptr++;
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while (*t_ptr != '\0')
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{ /* 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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