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1.1 ! root 1: /* ! 2: * Copyright (c) 1980 Regents of the University of California. ! 3: * All rights reserved. The Berkeley software License Agreement ! 4: * specifies the terms and conditions for redistribution. ! 5: */ ! 6: ! 7: #ifndef lint ! 8: static char sccsid[] = "@(#)pr_comment.c 5.3 (Berkeley) 9/8/85"; ! 9: #endif not lint ! 10: ! 11: /*- ! 12: * ! 13: * Copyright (C) 1976 ! 14: * by the ! 15: * Board of Trustees ! 16: * of the ! 17: * University of Illinois ! 18: * ! 19: * All rights reserved ! 20: * ! 21: * ! 22: * NAME: ! 23: * pr_comment ! 24: * ! 25: * FUNCTION: ! 26: * This routine takes care of scanning and printing comments. ! 27: * ! 28: * ALGORITHM: ! 29: * 1) Decide where the comment should be aligned, and if lines should ! 30: * be broken. ! 31: * 2) If lines should not be broken and filled, just copy up to end of ! 32: * comment. ! 33: * 3) If lines should be filled, then scan thru input_buffer copying ! 34: * characters to com_buf. Remember where the last blank, tab, or ! 35: * newline was. When line is filled, print up to last blank and ! 36: * continue copying. ! 37: * ! 38: * HISTORY: ! 39: * November 1976 D A Willcox of CAC Initial coding ! 40: * 12/6/76 D A Willcox of CAC Modification to handle ! 41: * UNIX-style comments ! 42: * ! 43: */ ! 44: ! 45: /* ! 46: * this routine processes comments. It makes an attempt to keep comments ! 47: * from going over the max line length. If a line is too long, it moves ! 48: * everything from the last blank to the next comment line. Blanks and ! 49: * tabs from the beginning of the input line are removed ! 50: */ ! 51: ! 52: #include "indent_globs.h"; ! 53: ! 54: ! 55: pr_comment() ! 56: { ! 57: int now_col; /* column we are in now */ ! 58: int adj_max_col; /* Adjusted max_col for when we decide to ! 59: * spill comments over the right margin */ ! 60: int col_1_com; /* this comment should not be touched */ ! 61: char *last_bl; /* points to the last blank in the output ! 62: * buffer */ ! 63: char achar; ! 64: char *t_ptr; /* used for moving string */ ! 65: int unix_comment; /* tri-state variable used to decide if it ! 66: * is a unix-style comment. 0 means only ! 67: * blanks since /*, 1 means regular style ! 68: * comment, 2 means unix style comment */ ! 69: int break_delim = comment_delimiter_on_blankline; ! 70: int l_just_saw_decl = ps.just_saw_decl; ! 71: /* ! 72: * int ps.last_nl = 0; /* true iff the last significant ! 73: * thing weve seen is a newline ! 74: */ ! 75: int one_liner = 1; /* true iff this comment is a one-liner */ ! 76: adj_max_col = max_col; ! 77: ps.just_saw_decl = 0; ! 78: last_bl = 0; /* no blanks found so far */ ! 79: ps.box_com = col_1_com = false; /* at first, assume that we are ! 80: * not in a boxed comment or some ! 81: * other comment that should not ! 82: * be touched */ ! 83: ++ps.out_coms; /* keep track of number of comments */ ! 84: unix_comment = 1; /* set flag to let us figure out if there ! 85: * is a unix-style comment ** DISABLED: ! 86: * use 0 to reenable this hack! */ ! 87: ! 88: /* Figure where to align and how to treat the comment */ ! 89: ! 90: if (ps.col_1 && !format_col1_comments) { /* if comment starts in ! 91: * column 1 it should not ! 92: * be touched */ ! 93: col_1_com = ps.box_com = true; ! 94: ps.com_col = 1; ! 95: } else { ! 96: if (*buf_ptr == '-' || *buf_ptr == '*') { ! 97: ps.box_com = true; /* a comment with a '-' or '*' immediately ! 98: * after the /* is assumed to be a boxed ! 99: * comment */ ! 100: col_1_com = true; ! 101: break_delim = 0; ! 102: } ! 103: if ( /* ps.bl_line && */ (s_lab == e_lab) && (s_code == e_code)) { ! 104: /* klg: check only if this line is blank */ ! 105: /* ! 106: * If this (*and previous lines are*) blank, dont put comment ! 107: * way out at left ! 108: */ ! 109: ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1; ! 110: adj_max_col = block_comment_max_col; ! 111: if (ps.com_col <= 1) ! 112: ps.com_col = 1 + !format_col1_comments; ! 113: } else { ! 114: register target_col; ! 115: break_delim = 0; ! 116: if (s_code != e_code) ! 117: target_col = count_spaces(compute_code_target(), s_code); ! 118: else { ! 119: target_col = 1; ! 120: if (s_lab != e_lab) ! 121: target_col = count_spaces(compute_label_target(), s_lab); ! 122: } ! 123: ps.com_col = ps.decl_on_line || ps.ind_level == 0 ? ps.decl_com_ind : ps.com_ind; ! 124: if (ps.com_col < target_col) ! 125: ps.com_col = ((target_col + 7) & ~7) + 1; ! 126: if (ps.com_col + 24 > adj_max_col) ! 127: adj_max_col = ps.com_col + 24; ! 128: } ! 129: } ! 130: if (ps.box_com) { ! 131: buf_ptr[-2] = 0; ! 132: ps.n_comment_delta = 1 - count_spaces(1, in_buffer); ! 133: ps.comment_delta = 0; ! 134: buf_ptr[-2] = '/'; ! 135: } else { ! 136: ps.n_comment_delta = 0; ! 137: ps.comment_delta = 0; ! 138: while (*buf_ptr == ' ' || *buf_ptr == '\t') ! 139: buf_ptr++; ! 140: } ! 141: ps.comment_delta = 0; ! 142: *e_com++ = '/'; /* put '/*' into buffer */ ! 143: *e_com++ = '*'; ! 144: if (*buf_ptr != ' ' && !ps.box_com) ! 145: *e_com++ = ' '; ! 146: ! 147: *e_com = '\0'; ! 148: now_col = count_spaces(ps.com_col, s_com); /* figure what column we ! 149: * would be in if we ! 150: * printed the comment now */ ! 151: ! 152: /* Start to copy the comment */ ! 153: ! 154: while (1) { /* this loop will go until the comment is ! 155: * copied */ ! 156: if (*buf_ptr > 040 && *buf_ptr != '*') ! 157: ps.last_nl = 0; ! 158: switch (*buf_ptr) { /* this checks for various spcl cases */ ! 159: case 014: /* check for a form feed */ ! 160: if (!ps.box_com) { /* in a text comment, break the ! 161: * line here */ ! 162: ps.use_ff = true; ! 163: /* fix so dump_line uses a form feed */ ! 164: dump_line(); ! 165: last_bl = 0; ! 166: *e_com++ = ' '; ! 167: *e_com++ = '*'; ! 168: *e_com++ = ' '; ! 169: while (*++buf_ptr == ' ' || *buf_ptr == '\t'); ! 170: } else { ! 171: if (++buf_ptr >= buf_end) ! 172: fill_buffer(); ! 173: *e_com++ = 014; ! 174: } ! 175: break; ! 176: ! 177: case '\n': ! 178: if (had_eof) { /* check for unexpected eof */ ! 179: printf("Unterminated comment\n"); ! 180: *e_com = '\0'; ! 181: dump_line(); ! 182: return; ! 183: } ! 184: one_liner = 0; ! 185: if (ps.box_com || ps.last_nl) { /* if this is a boxed ! 186: * comment, we dont ignore ! 187: * the newline */ ! 188: if (s_com == e_com) { ! 189: *e_com++ = ' '; ! 190: *e_com++ = ' '; ! 191: } ! 192: *e_com = '\0'; ! 193: if (!ps.box_com && e_com - s_com > 3) { ! 194: if (break_delim == 1 && s_com[0] == '/' ! 195: && s_com[1] == '*' && s_com[2] == ' ') { ! 196: char *t = e_com; ! 197: break_delim = 2; ! 198: e_com = s_com + 2; ! 199: *e_com = 0; ! 200: if (blanklines_before_blockcomments) prefix_blankline_requested = 1; ! 201: dump_line(); ! 202: e_com = t; ! 203: s_com[0] = s_com[1] = s_com[2] = ' '; ! 204: } ! 205: dump_line(); ! 206: *e_com++ = ' '; ! 207: *e_com++ = ' '; ! 208: } ! 209: dump_line(); ! 210: now_col = ps.com_col; ! 211: } else { ! 212: ps.last_nl = 1; ! 213: if (unix_comment != 1) { /* we not are in ! 214: * unix_style comment */ ! 215: if (unix_comment == 0 && s_code == e_code) { ! 216: /* ! 217: * if it is a UNIX-style comment, ignore the ! 218: * requirement that previous line be blank for ! 219: * unindention ! 220: */ ! 221: ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1; ! 222: if (ps.com_col <= 1) ! 223: ps.com_col = 2; ! 224: } ! 225: unix_comment = 2; /* permanently remember that we ! 226: * are in this type of comment */ ! 227: dump_line(); ! 228: ++line_no; ! 229: now_col = ps.com_col; ! 230: *e_com++ = ' '; ! 231: /* ! 232: * fix so that the star at the start of the line will ! 233: * line up ! 234: */ ! 235: do /* flush leading white space */ ! 236: if (++buf_ptr >= buf_end) ! 237: fill_buffer(); ! 238: while (*buf_ptr == ' ' || *buf_ptr == '\t'); ! 239: break; ! 240: } ! 241: if (*(e_com - 1) == ' ' || *(e_com - 1) == '\t') ! 242: last_bl = e_com - 1; ! 243: /* ! 244: * if there was a space at the end of the last line, ! 245: * remember where it was ! 246: */ ! 247: else { /* otherwise, insert one */ ! 248: last_bl = e_com; ! 249: *e_com++ = ' '; ! 250: ++now_col; ! 251: } ! 252: } ! 253: ++line_no; /* keep track of input line number */ ! 254: if (!ps.box_com) { ! 255: int nstar = 1; ! 256: do { /* flush any blanks and/or tabs at start ! 257: * of next line */ ! 258: if (++buf_ptr >= buf_end) ! 259: fill_buffer(); ! 260: if (*buf_ptr == '*' && --nstar >= 0) { ! 261: if (++buf_ptr >= buf_end) ! 262: fill_buffer(); ! 263: if (*buf_ptr == '/') ! 264: goto end_of_comment; ! 265: } ! 266: } while (*buf_ptr == ' ' || *buf_ptr == '\t'); ! 267: } else if (++buf_ptr >= buf_end) fill_buffer(); ! 268: break; /* end of case for newline */ ! 269: ! 270: case '*': /* must check for possibility of being at ! 271: * end of comment */ ! 272: if (++buf_ptr >= buf_end) /* get to next char after * */ ! 273: fill_buffer(); ! 274: ! 275: if (unix_comment == 0) /* set flag to show we are not in ! 276: * unix-style comment */ ! 277: unix_comment = 1; ! 278: ! 279: if (*buf_ptr == '/') { /* it is the end!!! */ ! 280: end_of_comment: ! 281: if (++buf_ptr >= buf_end) ! 282: fill_buffer(); ! 283: ! 284: if (*(e_com - 1) != ' ' && !ps.box_com) { /* insure blank before ! 285: * end */ ! 286: *e_com++ = ' '; ! 287: ++now_col; ! 288: } ! 289: if (break_delim == 1 && !one_liner && s_com[0] == '/' ! 290: && s_com[1] == '*' && s_com[2] == ' ') { ! 291: char *t = e_com; ! 292: break_delim = 2; ! 293: e_com = s_com + 2; ! 294: *e_com = 0; ! 295: if (blanklines_before_blockcomments) prefix_blankline_requested = 1; ! 296: dump_line(); ! 297: e_com = t; ! 298: s_com[0] = s_com[1] = s_com[2] = ' '; ! 299: } ! 300: if (break_delim == 2 && e_com > s_com + 3 ! 301: /* now_col > adj_max_col - 2 && !ps.box_com */ ) { ! 302: *e_com = '\0'; ! 303: dump_line(); ! 304: now_col = ps.com_col; ! 305: } ! 306: *e_com++ = '*'; ! 307: *e_com++ = '/'; ! 308: *e_com = '\0'; ! 309: ps.just_saw_decl = l_just_saw_decl; ! 310: return; ! 311: } else { /* handle isolated '*' */ ! 312: *e_com++ = '*'; ! 313: ++now_col; ! 314: } ! 315: break; ! 316: default: /* we have a random char */ ! 317: if (unix_comment == 0 && *buf_ptr != ' ' && *buf_ptr != '\t') ! 318: unix_comment = 1; /* we are not in unix-style ! 319: * comment */ ! 320: ! 321: *e_com = *buf_ptr++; ! 322: if (buf_ptr >= buf_end) ! 323: fill_buffer(); ! 324: ! 325: if (*e_com == '\t') /* keep track of column */ ! 326: now_col = ((now_col - 1) & tabmask) + tabsize + 1; ! 327: else if (*e_com == '\b') /* this is a backspace */ ! 328: --now_col; ! 329: else ! 330: ++now_col; ! 331: ! 332: if (*e_com == ' ' || *e_com == '\t') ! 333: last_bl = e_com; ! 334: /* remember we saw a blank */ ! 335: ! 336: ++e_com; ! 337: if (now_col > adj_max_col && !ps.box_com && unix_comment == 1 && e_com[-1] > ' ') { ! 338: /* the comment is too long, it must be broken up */ ! 339: if (break_delim == 1 && s_com[0] == '/' ! 340: && s_com[1] == '*' && s_com[2] == ' ') { ! 341: char *t = e_com; ! 342: break_delim = 2; ! 343: e_com = s_com + 2; ! 344: *e_com = 0; ! 345: if (blanklines_before_blockcomments) prefix_blankline_requested = 1; ! 346: dump_line(); ! 347: e_com = t; ! 348: s_com[0] = s_com[1] = s_com[2] = ' '; ! 349: } ! 350: if (last_bl == 0) { /* we have seen no blanks */ ! 351: last_bl = e_com; /* fake it */ ! 352: *e_com++ = ' '; ! 353: } ! 354: *e_com = '\0'; /* print what we have */ ! 355: *last_bl = '\0'; ! 356: while (last_bl > s_com && last_bl[-1] < 040) ! 357: *--last_bl = 0; ! 358: e_com = last_bl; ! 359: dump_line(); ! 360: ! 361: *e_com++ = ' '; /* add blanks for continuation */ ! 362: *e_com++ = ' '; ! 363: *e_com++ = ' '; ! 364: ! 365: t_ptr = last_bl + 1; ! 366: last_bl = 0; ! 367: if (t_ptr >= e_com) { ! 368: while (*t_ptr == ' ' || *t_ptr == '\t') ! 369: t_ptr++; ! 370: while (*t_ptr != '\0') { /* move unprinted part ! 371: * of comment down in ! 372: * buffer */ ! 373: if (*t_ptr == ' ' || *t_ptr == '\t') ! 374: last_bl = e_com; ! 375: *e_com++ = *t_ptr++; ! 376: } ! 377: } ! 378: *e_com = '\0'; ! 379: now_col = count_spaces(ps.com_col, s_com); /* recompute current ! 380: * position */ ! 381: } ! 382: break; ! 383: } ! 384: } ! 385: }
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