/* $OpenBSD: pr_comment.c,v 1.7 2009/10/27 23:59:39 deraadt Exp $ */ /* * Copyright (c) 1980, 1993 * The Regents of the University of California. * Copyright (c) 1976 Board of Trustees of the University of Illinois. * Copyright (c) 1985 Sun Microsystems, Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <err.h> #include <stdio.h> #include <stdlib.h> #include "indent_globs.h" /* * 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 */ void pr_comment(void) { 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 * we've 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 == '*' || *buf_ptr == '\n') { ps.box_com = true; /* a comment with a '-', '*' or newline * 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, don't 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 { int 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 */ *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 (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 don't 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 == ' ' || *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; CHECK_SIZE_COM; *e_com++ = ' '; ++now_col; } } ++line_no; /* keep track of input line number */ if (!ps.box_com) { int nstar = 1; do { /* flush any blanks and/or tabs at start of * next line */ if (++buf_ptr >= buf_end) fill_buffer(); if (*buf_ptr == '*' && --nstar >= 0) { if (++buf_ptr >= buf_end) fill_buffer(); if (*buf_ptr == '/') goto end_of_comment; } } while (*buf_ptr == ' ' || *buf_ptr == '\t'); } else if (++buf_ptr >= buf_end) fill_buffer(); 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!!! */ end_of_comment: if (++buf_ptr >= buf_end) fill_buffer(); if (*(e_com - 1) != ' ' && !ps.box_com) { /* insure blank before * end */ *e_com++ = ' '; ++now_col; } if (break_delim == 1 && !one_liner && 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] = ' '; } if (break_delim == 2 && e_com > s_com + 3 /* now_col > adj_max_col - 2 && !ps.box_com */ ) { *e_com = '\0'; dump_line(); now_col = ps.com_col; } CHECK_SIZE_COM; *e_com++ = '*'; *e_com++ = '/'; *e_com = '\0'; ps.just_saw_decl = l_just_saw_decl; return; } else { /* handle isolated '*' */ *e_com++ = '*'; ++now_col; } break; 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 > adj_max_col && !ps.box_com && unix_comment == 1 && e_com[-1] > ' ') { /* * the comment is too long, it must be broken up */ 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] = ' '; } if (last_bl == 0) { /* we have seen no blanks */ last_bl = e_com; /* fake it */ *e_com++ = ' '; } *e_com = '\0'; /* print what we have */ *last_bl = '\0'; while (last_bl > s_com && last_bl[-1] < 040) *--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; if (t_ptr >= e_com) { while (*t_ptr == ' ' || *t_ptr == '\t') t_ptr++; while (*t_ptr != '\0') { /* move unprinted part 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(ps.com_col, s_com); /* recompute current * position */ } break; } } }
