1 /* 2 * Copyright (c) 1980 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that this notice is preserved and that due credit is given 7 * to the University of California at Berkeley. The name of the University 8 * may not be used to endorse or promote products derived from this 9 * software without specific written prior permission. This software 10 * is provided ``as is'' without express or implied warranty. 11 */ 12 13 #ifndef lint 14 char copyright[] = 15 "@(#) Copyright (c) 1980 Regents of the University of California.\n\ 16 All rights reserved.\n"; 17 #endif /* not lint */ 18 19 #ifndef lint 20 static char sccsid[] = "@(#)more.c 5.14 (Berkeley) 12/02/87"; 21 #endif /* not lint */ 22 23 /* 24 ** more.c - General purpose tty output filter and file perusal program 25 ** 26 ** by Eric Shienbrood, UC Berkeley 27 ** 28 ** modified by Geoff Peck, UCB to add underlining, single spacing 29 ** modified by John Foderaro, UCB to add -c and MORE environment variable 30 */ 31 32 #include <stdio.h> 33 #include <sys/param.h> 34 #include <ctype.h> 35 #include <signal.h> 36 #include <errno.h> 37 #include <sgtty.h> 38 #include <setjmp.h> 39 #include <sys/stat.h> 40 #include <sys/file.h> 41 #include <a.out.h> 42 #include <varargs.h> 43 44 #define HELPFILE "/usr/lib/more.help" 45 #define VI "/usr/ucb/vi" 46 47 #define Fopen(s,m) (Currline = 0,file_pos=0,fopen(s,m)) 48 #define Ftell(f) file_pos 49 #define Fseek(f,off) (file_pos=off,fseek(f,off,0)) 50 #define Getc(f) (++file_pos, getc(f)) 51 #define Ungetc(c,f) (--file_pos, ungetc(c,f)) 52 53 #define MBIT CBREAK 54 #define stty(fd,argp) ioctl(fd,TIOCSETN,argp) 55 56 #define TBUFSIZ 1024 57 #define LINSIZ 256 58 #define ctrl(letter) ('letter' & 077) 59 #define RUBOUT '\177' 60 #define ESC '\033' 61 #define QUIT '\034' 62 63 struct sgttyb otty, savetty; 64 long file_pos, file_size; 65 int fnum, no_intty, no_tty, slow_tty; 66 int dum_opt, dlines, onquit(), end_it(), chgwinsz(); 67 int onsusp(); 68 int nscroll = 11; /* Number of lines scrolled by 'd' */ 69 int fold_opt = 1; /* Fold long lines */ 70 int stop_opt = 1; /* Stop after form feeds */ 71 int ssp_opt = 0; /* Suppress white space */ 72 int ul_opt = 1; /* Underline as best we can */ 73 int promptlen; 74 int Currline; /* Line we are currently at */ 75 int startup = 1; 76 int firstf = 1; 77 int notell = 1; 78 int docrterase = 0; 79 int docrtkill = 0; 80 int bad_so; /* True if overwriting does not turn off standout */ 81 int inwait, Pause, errors; 82 int within; /* true if we are within a file, 83 false if we are between files */ 84 int hard, dumb, noscroll, hardtabs, clreol, eatnl; 85 int catch_susp; /* We should catch the SIGTSTP signal */ 86 char **fnames; /* The list of file names */ 87 int nfiles; /* Number of files left to process */ 88 char *shell; /* The name of the shell to use */ 89 int shellp; /* A previous shell command exists */ 90 char ch; 91 jmp_buf restore; 92 char Line[LINSIZ]; /* Line buffer */ 93 int Lpp = 24; /* lines per page */ 94 char *Clear; /* clear screen */ 95 char *eraseln; /* erase line */ 96 char *Senter, *Sexit;/* enter and exit standout mode */ 97 char *ULenter, *ULexit; /* enter and exit underline mode */ 98 char *chUL; /* underline character */ 99 char *chBS; /* backspace character */ 100 char *Home; /* go to home */ 101 char *cursorm; /* cursor movement */ 102 char cursorhome[40]; /* contains cursor movement to home */ 103 char *EodClr; /* clear rest of screen */ 104 char *tgetstr(); 105 int Mcol = 80; /* number of columns */ 106 int Wrap = 1; /* set if automargins */ 107 int soglitch; /* terminal has standout mode glitch */ 108 int ulglitch; /* terminal has underline mode glitch */ 109 int pstate = 0; /* current UL state */ 110 long fseek(); 111 char *getenv(); 112 struct { 113 long chrctr, line; 114 } context, screen_start; 115 extern char PC; /* pad character */ 116 extern short ospeed; 117 118 119 main(argc, argv) 120 int argc; 121 char *argv[]; 122 { 123 register FILE *f; 124 register char *s; 125 register char *p; 126 register char ch; 127 register int left; 128 int prnames = 0; 129 int initopt = 0; 130 int srchopt = 0; 131 int clearit = 0; 132 int initline; 133 char initbuf[80]; 134 FILE *checkf(); 135 136 nfiles = argc; 137 fnames = argv; 138 initterm (); 139 nscroll = Lpp/2 - 1; 140 if (nscroll <= 0) 141 nscroll = 1; 142 if(s = getenv("MORE")) argscan(s); 143 while (--nfiles > 0) { 144 if ((ch = (*++fnames)[0]) == '-') { 145 argscan(*fnames+1); 146 } 147 else if (ch == '+') { 148 s = *fnames; 149 if (*++s == '/') { 150 srchopt++; 151 for (++s, p = initbuf; p < initbuf + 79 && *s != '\0';) 152 *p++ = *s++; 153 *p = '\0'; 154 } 155 else { 156 initopt++; 157 for (initline = 0; *s != '\0'; s++) 158 if (isdigit (*s)) 159 initline = initline*10 + *s -'0'; 160 --initline; 161 } 162 } 163 else break; 164 } 165 /* allow clreol only if Home and eraseln and EodClr strings are 166 * defined, and in that case, make sure we are in noscroll mode 167 */ 168 if(clreol) 169 { 170 if((Home == NULL) || (*Home == '\0') || 171 (eraseln == NULL) || (*eraseln == '\0') || 172 (EodClr == NULL) || (*EodClr == '\0') ) 173 clreol = 0; 174 else noscroll = 1; 175 } 176 if (dlines == 0) 177 dlines = Lpp - (noscroll ? 1 : 2); 178 left = dlines; 179 if (nfiles > 1) 180 prnames++; 181 if (!no_intty && nfiles == 0) { 182 fputs("Usage: ",stderr); 183 fputs(argv[0],stderr); 184 fputs(" [-dfln] [+linenum | +/pattern] name1 name2 ...\n",stderr); 185 exit(1); 186 } 187 else 188 f = stdin; 189 if (!no_tty) { 190 signal(SIGQUIT, onquit); 191 signal(SIGINT, end_it); 192 signal(SIGWINCH, chgwinsz); 193 if (signal (SIGTSTP, SIG_IGN) == SIG_DFL) { 194 signal(SIGTSTP, onsusp); 195 catch_susp++; 196 } 197 stty (fileno(stderr), &otty); 198 } 199 if (no_intty) { 200 if (no_tty) 201 copy_file (stdin); 202 else { 203 if ((ch = Getc (f)) == '\f') 204 doclear(); 205 else { 206 Ungetc (ch, f); 207 if (noscroll && (ch != EOF)) { 208 if (clreol) 209 home (); 210 else 211 doclear (); 212 } 213 } 214 if (srchopt) 215 { 216 search (initbuf, stdin, 1); 217 if (noscroll) 218 left--; 219 } 220 else if (initopt) 221 skiplns (initline, stdin); 222 screen (stdin, left); 223 } 224 no_intty = 0; 225 prnames++; 226 firstf = 0; 227 } 228 229 while (fnum < nfiles) { 230 if ((f = checkf (fnames[fnum], &clearit)) != NULL) { 231 context.line = context.chrctr = 0; 232 Currline = 0; 233 if (firstf) setjmp (restore); 234 if (firstf) { 235 firstf = 0; 236 if (srchopt) 237 { 238 search (initbuf, f, 1); 239 if (noscroll) 240 left--; 241 } 242 else if (initopt) 243 skiplns (initline, f); 244 } 245 else if (fnum < nfiles && !no_tty) { 246 setjmp (restore); 247 left = command (fnames[fnum], f); 248 } 249 if (left != 0) { 250 if ((noscroll || clearit) && (file_size != LONG_MAX)) 251 if (clreol) 252 home (); 253 else 254 doclear (); 255 if (prnames) { 256 if (bad_so) 257 erase (0); 258 if (clreol) 259 cleareol (); 260 pr("::::::::::::::"); 261 if (promptlen > 14) 262 erase (14); 263 printf ("\n"); 264 if(clreol) cleareol(); 265 printf("%s\n", fnames[fnum]); 266 if(clreol) cleareol(); 267 printf("::::::::::::::\n"); 268 if (left > Lpp - 4) 269 left = Lpp - 4; 270 } 271 if (no_tty) 272 copy_file (f); 273 else { 274 within++; 275 screen(f, left); 276 within = 0; 277 } 278 } 279 setjmp (restore); 280 fflush(stdout); 281 fclose(f); 282 screen_start.line = screen_start.chrctr = 0L; 283 context.line = context.chrctr = 0L; 284 } 285 fnum++; 286 firstf = 0; 287 } 288 reset_tty (); 289 exit(0); 290 } 291 292 argscan(s) 293 char *s; 294 { 295 int seen_num = 0; 296 297 while (*s != '\0') { 298 switch (*s) { 299 case '0': case '1': case '2': 300 case '3': case '4': case '5': 301 case '6': case '7': case '8': 302 case '9': 303 if (!seen_num) { 304 dlines = 0; 305 seen_num = 1; 306 } 307 dlines = dlines*10 + *s - '0'; 308 break; 309 case 'd': 310 dum_opt = 1; 311 break; 312 case 'l': 313 stop_opt = 0; 314 break; 315 case 'f': 316 fold_opt = 0; 317 break; 318 case 'p': 319 noscroll++; 320 break; 321 case 'c': 322 clreol++; 323 break; 324 case 's': 325 ssp_opt = 1; 326 break; 327 case 'u': 328 ul_opt = 0; 329 break; 330 } 331 s++; 332 } 333 } 334 335 336 /* 337 ** Check whether the file named by fs is an ASCII file which the user may 338 ** access. If it is, return the opened file. Otherwise return NULL. 339 */ 340 341 FILE * 342 checkf (fs, clearfirst) 343 register char *fs; 344 int *clearfirst; 345 { 346 struct stat stbuf; 347 register FILE *f; 348 char c; 349 350 if (stat (fs, &stbuf) == -1) { 351 (void)fflush(stdout); 352 if (clreol) 353 cleareol (); 354 perror(fs); 355 return((FILE *)NULL); 356 } 357 if ((stbuf.st_mode & S_IFMT) == S_IFDIR) { 358 printf("\n*** %s: directory ***\n\n", fs); 359 return((FILE *)NULL); 360 } 361 if ((f = Fopen(fs, "r")) == NULL) { 362 (void)fflush(stdout); 363 perror(fs); 364 return((FILE *)NULL); 365 } 366 if (magic(f, fs)) 367 return((FILE *)NULL); 368 c = Getc(f); 369 *clearfirst = c == '\f'; 370 Ungetc (c, f); 371 if ((file_size = stbuf.st_size) == 0) 372 file_size = LONG_MAX; 373 return(f); 374 } 375 376 /* 377 * magic -- 378 * check for file magic numbers. This code would best be shared with 379 * the file(1) program or, perhaps, more should not try and be so smart? 380 */ 381 static 382 magic(f, fs) 383 FILE *f; 384 char *fs; 385 { 386 struct exec ex; 387 388 if (fread(&ex, sizeof(ex), 1, f) == 1) 389 switch(ex.a_magic) { 390 case OMAGIC: 391 case NMAGIC: 392 case ZMAGIC: 393 case 0405: 394 case 0411: 395 case 0177545: 396 printf("\n******** %s: Not a text file ********\n\n", fs); 397 (void)fclose(f); 398 return(1); 399 } 400 (void)fseek(f, 0L, L_SET); /* rewind() not necessary */ 401 return(NULL); 402 } 403 404 /* 405 ** A real function, for the tputs routine in termlib 406 */ 407 408 putch (ch) 409 char ch; 410 { 411 putchar (ch); 412 } 413 414 /* 415 ** Print out the contents of the file f, one screenful at a time. 416 */ 417 418 #define STOP -10 419 420 screen (f, num_lines) 421 register FILE *f; 422 register int num_lines; 423 { 424 register int c; 425 register int nchars; 426 int length; /* length of current line */ 427 static int prev_len = 1; /* length of previous line */ 428 429 for (;;) { 430 while (num_lines > 0 && !Pause) { 431 if ((nchars = getline (f, &length)) == EOF) 432 { 433 if (clreol) 434 clreos(); 435 return; 436 } 437 if (ssp_opt && length == 0 && prev_len == 0) 438 continue; 439 prev_len = length; 440 if (bad_so || (Senter && *Senter == ' ') && promptlen > 0) 441 erase (0); 442 /* must clear before drawing line since tabs on some terminals 443 * do not erase what they tab over. 444 */ 445 if (clreol) 446 cleareol (); 447 prbuf (Line, length); 448 if (nchars < promptlen) 449 erase (nchars); /* erase () sets promptlen to 0 */ 450 else promptlen = 0; 451 /* is this needed? 452 * if (clreol) 453 * cleareol(); /* must clear again in case we wrapped * 454 */ 455 if (nchars < Mcol || !fold_opt) 456 prbuf("\n", 1); /* will turn off UL if necessary */ 457 if (nchars == STOP) 458 break; 459 num_lines--; 460 } 461 if (pstate) { 462 tputs(ULexit, 1, putch); 463 pstate = 0; 464 } 465 fflush(stdout); 466 if ((c = Getc(f)) == EOF) 467 { 468 if (clreol) 469 clreos (); 470 return; 471 } 472 473 if (Pause && clreol) 474 clreos (); 475 Ungetc (c, f); 476 setjmp (restore); 477 Pause = 0; startup = 0; 478 if ((num_lines = command (NULL, f)) == 0) 479 return; 480 if (hard && promptlen > 0) 481 erase (0); 482 if (noscroll && num_lines >= dlines) 483 { 484 if (clreol) 485 home(); 486 else 487 doclear (); 488 } 489 screen_start.line = Currline; 490 screen_start.chrctr = Ftell (f); 491 } 492 } 493 494 /* 495 ** Come here if a quit signal is received 496 */ 497 498 onquit() 499 { 500 signal(SIGQUIT, SIG_IGN); 501 if (!inwait) { 502 putchar ('\n'); 503 if (!startup) { 504 signal(SIGQUIT, onquit); 505 longjmp (restore, 1); 506 } 507 else 508 Pause++; 509 } 510 else if (!dum_opt && notell) { 511 write (2, "[Use q or Q to quit]", 20); 512 promptlen += 20; 513 notell = 0; 514 } 515 signal(SIGQUIT, onquit); 516 } 517 518 /* 519 ** Come here if a signal for a window size change is received 520 */ 521 522 chgwinsz() 523 { 524 struct winsize win; 525 526 (void) signal(SIGWINCH, SIG_IGN); 527 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1) { 528 if (win.ws_row != 0) { 529 Lpp = win.ws_row; 530 nscroll = Lpp/2 - 1; 531 if (nscroll <= 0) 532 nscroll = 1; 533 dlines = Lpp - (noscroll ? 1 : 2); 534 } 535 if (win.ws_col != 0) 536 Mcol = win.ws_col; 537 } 538 (void) signal(SIGWINCH, chgwinsz); 539 } 540 541 /* 542 ** Clean up terminal state and exit. Also come here if interrupt signal received 543 */ 544 545 end_it () 546 { 547 548 reset_tty (); 549 if (clreol) { 550 putchar ('\r'); 551 clreos (); 552 fflush (stdout); 553 } 554 else if (!clreol && (promptlen > 0)) { 555 kill_line (); 556 fflush (stdout); 557 } 558 else 559 write (2, "\n", 1); 560 _exit(0); 561 } 562 563 copy_file(f) 564 register FILE *f; 565 { 566 register int c; 567 568 while ((c = getc(f)) != EOF) 569 putchar(c); 570 } 571 572 /* Simplified printf function */ 573 574 printf (fmt, args) 575 register char *fmt; 576 int args; 577 { 578 register int *argp; 579 register char ch; 580 register int ccount; 581 582 ccount = 0; 583 argp = &args; 584 while (*fmt) { 585 while ((ch = *fmt++) != '%') { 586 if (ch == '\0') 587 return (ccount); 588 ccount++; 589 putchar (ch); 590 } 591 switch (*fmt++) { 592 case 'd': 593 ccount += printd (*argp); 594 break; 595 case 's': 596 ccount += pr ((char *)*argp); 597 break; 598 case '%': 599 ccount++; 600 argp--; 601 putchar ('%'); 602 break; 603 case '0': 604 return (ccount); 605 default: 606 break; 607 } 608 ++argp; 609 } 610 return (ccount); 611 612 } 613 614 /* 615 ** Print an integer as a string of decimal digits, 616 ** returning the length of the print representation. 617 */ 618 619 printd (n) 620 int n; 621 { 622 int a, nchars; 623 624 if (a = n/10) 625 nchars = 1 + printd(a); 626 else 627 nchars = 1; 628 putchar (n % 10 + '0'); 629 return (nchars); 630 } 631 632 /* Put the print representation of an integer into a string */ 633 static char *sptr; 634 635 scanstr (n, str) 636 int n; 637 char *str; 638 { 639 sptr = str; 640 Sprintf (n); 641 *sptr = '\0'; 642 } 643 644 Sprintf (n) 645 { 646 int a; 647 648 if (a = n/10) 649 Sprintf (a); 650 *sptr++ = n % 10 + '0'; 651 } 652 653 static char bell = ctrl(G); 654 655 strlen (s) 656 char *s; 657 { 658 register char *p; 659 660 p = s; 661 while (*p++) 662 ; 663 return (p - s - 1); 664 } 665 666 /* See whether the last component of the path name "path" is equal to the 667 ** string "string" 668 */ 669 670 tailequ (path, string) 671 char *path; 672 register char *string; 673 { 674 register char *tail; 675 676 tail = path + strlen(path); 677 while (tail >= path) 678 if (*(--tail) == '/') 679 break; 680 ++tail; 681 while (*tail++ == *string++) 682 if (*tail == '\0') 683 return(1); 684 return(0); 685 } 686 687 prompt (filename) 688 char *filename; 689 { 690 if (clreol) 691 cleareol (); 692 else if (promptlen > 0) 693 kill_line (); 694 if (!hard) { 695 promptlen = 8; 696 if (Senter && Sexit) { 697 tputs (Senter, 1, putch); 698 promptlen += (2 * soglitch); 699 } 700 if (clreol) 701 cleareol (); 702 pr("--More--"); 703 if (filename != NULL) { 704 promptlen += printf ("(Next file: %s)", filename); 705 } 706 else if (!no_intty) { 707 promptlen += printf ("(%d%%)", (int)((file_pos * 100) / file_size)); 708 } 709 if (dum_opt) { 710 promptlen += pr("[Press space to continue, 'q' to quit.]"); 711 } 712 if (Senter && Sexit) 713 tputs (Sexit, 1, putch); 714 if (clreol) 715 clreos (); 716 fflush(stdout); 717 } 718 else 719 write (2, &bell, 1); 720 inwait++; 721 } 722 723 /* 724 ** Get a logical line 725 */ 726 727 getline(f, length) 728 register FILE *f; 729 int *length; 730 { 731 register int c; 732 register char *p; 733 register int column; 734 static int colflg; 735 736 p = Line; 737 column = 0; 738 c = Getc (f); 739 if (colflg && c == '\n') { 740 Currline++; 741 c = Getc (f); 742 } 743 while (p < &Line[LINSIZ - 1]) { 744 if (c == EOF) { 745 if (p > Line) { 746 *p = '\0'; 747 *length = p - Line; 748 return (column); 749 } 750 *length = p - Line; 751 return (EOF); 752 } 753 if (c == '\n') { 754 Currline++; 755 break; 756 } 757 *p++ = c; 758 if (c == '\t') 759 if (!hardtabs || column < promptlen && !hard) { 760 if (hardtabs && eraseln && !dumb) { 761 column = 1 + (column | 7); 762 tputs (eraseln, 1, putch); 763 promptlen = 0; 764 } 765 else { 766 for (--p; p < &Line[LINSIZ - 1];) { 767 *p++ = ' '; 768 if ((++column & 7) == 0) 769 break; 770 } 771 if (column >= promptlen) promptlen = 0; 772 } 773 } 774 else 775 column = 1 + (column | 7); 776 else if (c == '\b' && column > 0) 777 column--; 778 else if (c == '\r') 779 column = 0; 780 else if (c == '\f' && stop_opt) { 781 p[-1] = '^'; 782 *p++ = 'L'; 783 column += 2; 784 Pause++; 785 } 786 else if (c == EOF) { 787 *length = p - Line; 788 return (column); 789 } 790 else if (c >= ' ' && c != RUBOUT) 791 column++; 792 if (column >= Mcol && fold_opt) break; 793 c = Getc (f); 794 } 795 if (column >= Mcol && Mcol > 0) { 796 if (!Wrap) { 797 *p++ = '\n'; 798 } 799 } 800 colflg = column == Mcol && fold_opt; 801 if (colflg && eatnl && Wrap) { 802 *p++ = '\n'; /* simulate normal wrap */ 803 } 804 *length = p - Line; 805 *p = 0; 806 return (column); 807 } 808 809 /* 810 ** Erase the rest of the prompt, assuming we are starting at column col. 811 */ 812 813 erase (col) 814 register int col; 815 { 816 817 if (promptlen == 0) 818 return; 819 if (hard) { 820 putchar ('\n'); 821 } 822 else { 823 if (col == 0) 824 putchar ('\r'); 825 if (!dumb && eraseln) 826 tputs (eraseln, 1, putch); 827 else 828 for (col = promptlen - col; col > 0; col--) 829 putchar (' '); 830 } 831 promptlen = 0; 832 } 833 834 /* 835 ** Erase the current line entirely 836 */ 837 838 kill_line () 839 { 840 erase (0); 841 if (!eraseln || dumb) putchar ('\r'); 842 } 843 844 /* 845 * force clear to end of line 846 */ 847 cleareol() 848 { 849 tputs(eraseln, 1, putch); 850 } 851 852 clreos() 853 { 854 tputs(EodClr, 1, putch); 855 } 856 857 /* 858 ** Print string and return number of characters 859 */ 860 861 pr(s1) 862 char *s1; 863 { 864 register char *s; 865 register char c; 866 867 for (s = s1; c = *s++; ) 868 putchar(c); 869 return (s - s1 - 1); 870 } 871 872 873 /* Print a buffer of n characters */ 874 875 prbuf (s, n) 876 register char *s; 877 register int n; 878 { 879 register char c; /* next output character */ 880 register int state; /* next output char's UL state */ 881 #define wouldul(s,n) ((n) >= 2 && (((s)[0] == '_' && (s)[1] == '\b') || ((s)[1] == '\b' && (s)[2] == '_'))) 882 883 while (--n >= 0) 884 if (!ul_opt) 885 putchar (*s++); 886 else { 887 if (*s == ' ' && pstate == 0 && ulglitch && wouldul(s+1, n-1)) { 888 s++; 889 continue; 890 } 891 if (state = wouldul(s, n)) { 892 c = (*s == '_')? s[2] : *s ; 893 n -= 2; 894 s += 3; 895 } else 896 c = *s++; 897 if (state != pstate) { 898 if (c == ' ' && state == 0 && ulglitch && wouldul(s, n-1)) 899 state = 1; 900 else 901 tputs(state ? ULenter : ULexit, 1, putch); 902 } 903 if (c != ' ' || pstate == 0 || state != 0 || ulglitch == 0) 904 putchar(c); 905 if (state && *chUL) { 906 pr(chBS); 907 tputs(chUL, 1, putch); 908 } 909 pstate = state; 910 } 911 } 912 913 /* 914 ** Clear the screen 915 */ 916 917 doclear() 918 { 919 if (Clear && !hard) { 920 tputs(Clear, 1, putch); 921 922 /* Put out carriage return so that system doesn't 923 ** get confused by escape sequences when expanding tabs 924 */ 925 putchar ('\r'); 926 promptlen = 0; 927 } 928 } 929 930 /* 931 * Go to home position 932 */ 933 home() 934 { 935 tputs(Home,1,putch); 936 } 937 938 static int lastcmd, lastarg, lastp; 939 static int lastcolon; 940 char shell_line[132]; 941 942 /* 943 ** Read a command and do it. A command consists of an optional integer 944 ** argument followed by the command character. Return the number of lines 945 ** to display in the next screenful. If there is nothing more to display 946 ** in the current file, zero is returned. 947 */ 948 949 command (filename, f) 950 char *filename; 951 register FILE *f; 952 { 953 register int nlines; 954 register int retval; 955 register char c; 956 char colonch; 957 FILE *helpf; 958 int done; 959 char comchar, cmdbuf[80], *p; 960 961 #define ret(val) retval=val;done++;break 962 963 done = 0; 964 if (!errors) 965 prompt (filename); 966 else 967 errors = 0; 968 if (MBIT == RAW && slow_tty) { 969 otty.sg_flags |= MBIT; 970 stty(fileno(stderr), &otty); 971 } 972 for (;;) { 973 nlines = number (&comchar); 974 lastp = colonch = 0; 975 if (comchar == '.') { /* Repeat last command */ 976 lastp++; 977 comchar = lastcmd; 978 nlines = lastarg; 979 if (lastcmd == ':') 980 colonch = lastcolon; 981 } 982 lastcmd = comchar; 983 lastarg = nlines; 984 if (comchar == otty.sg_erase) { 985 kill_line (); 986 prompt (filename); 987 continue; 988 } 989 switch (comchar) { 990 case ':': 991 retval = colon (filename, colonch, nlines); 992 if (retval >= 0) 993 done++; 994 break; 995 case 'b': 996 case ctrl(B): 997 { 998 register int initline; 999 1000 if (no_intty) { 1001 write(2, &bell, 1); 1002 return (-1); 1003 } 1004 1005 if (nlines == 0) nlines++; 1006 1007 putchar ('\r'); 1008 erase (0); 1009 printf ("\n"); 1010 if (clreol) 1011 cleareol (); 1012 printf ("...back %d page", nlines); 1013 if (nlines > 1) 1014 pr ("s\n"); 1015 else 1016 pr ("\n"); 1017 1018 if (clreol) 1019 cleareol (); 1020 pr ("\n"); 1021 1022 initline = Currline - dlines * (nlines + 1); 1023 if (! noscroll) 1024 --initline; 1025 if (initline < 0) initline = 0; 1026 Fseek(f, 0L); 1027 Currline = 0; /* skiplns() will make Currline correct */ 1028 skiplns(initline, f); 1029 if (! noscroll) { 1030 ret(dlines + 1); 1031 } 1032 else { 1033 ret(dlines); 1034 } 1035 } 1036 case ' ': 1037 case 'z': 1038 if (nlines == 0) nlines = dlines; 1039 else if (comchar == 'z') dlines = nlines; 1040 ret (nlines); 1041 case 'd': 1042 case ctrl(D): 1043 if (nlines != 0) nscroll = nlines; 1044 ret (nscroll); 1045 case 'q': 1046 case 'Q': 1047 end_it (); 1048 case 's': 1049 case 'f': 1050 if (nlines == 0) nlines++; 1051 if (comchar == 'f') 1052 nlines *= dlines; 1053 putchar ('\r'); 1054 erase (0); 1055 printf ("\n"); 1056 if (clreol) 1057 cleareol (); 1058 printf ("...skipping %d line", nlines); 1059 if (nlines > 1) 1060 pr ("s\n"); 1061 else 1062 pr ("\n"); 1063 1064 if (clreol) 1065 cleareol (); 1066 pr ("\n"); 1067 1068 while (nlines > 0) { 1069 while ((c = Getc (f)) != '\n') 1070 if (c == EOF) { 1071 retval = 0; 1072 done++; 1073 goto endsw; 1074 } 1075 Currline++; 1076 nlines--; 1077 } 1078 ret (dlines); 1079 case '\n': 1080 if (nlines != 0) 1081 dlines = nlines; 1082 else 1083 nlines = 1; 1084 ret (nlines); 1085 case '\f': 1086 if (!no_intty) { 1087 doclear (); 1088 Fseek (f, screen_start.chrctr); 1089 Currline = screen_start.line; 1090 ret (dlines); 1091 } 1092 else { 1093 write (2, &bell, 1); 1094 break; 1095 } 1096 case '\'': 1097 if (!no_intty) { 1098 kill_line (); 1099 pr ("\n***Back***\n\n"); 1100 Fseek (f, context.chrctr); 1101 Currline = context.line; 1102 ret (dlines); 1103 } 1104 else { 1105 write (2, &bell, 1); 1106 break; 1107 } 1108 case '=': 1109 kill_line (); 1110 promptlen = printd (Currline); 1111 fflush (stdout); 1112 break; 1113 case 'n': 1114 lastp++; 1115 case '/': 1116 if (nlines == 0) nlines++; 1117 kill_line (); 1118 pr ("/"); 1119 promptlen = 1; 1120 fflush (stdout); 1121 if (lastp) { 1122 write (2,"\r", 1); 1123 search (NULL, f, nlines); /* Use previous r.e. */ 1124 } 1125 else { 1126 ttyin (cmdbuf, 78, '/'); 1127 write (2, "\r", 1); 1128 search (cmdbuf, f, nlines); 1129 } 1130 ret (dlines-1); 1131 case '!': 1132 do_shell (filename); 1133 break; 1134 case '?': 1135 case 'h': 1136 if ((helpf = fopen (HELPFILE, "r")) == NULL) 1137 error ("Can't open help file"); 1138 if (noscroll) doclear (); 1139 copy_file (helpf); 1140 fclose (helpf); 1141 prompt (filename); 1142 break; 1143 case 'v': /* This case should go right before default */ 1144 if (!no_intty) { 1145 kill_line (); 1146 cmdbuf[0] = '+'; 1147 scanstr (Currline - dlines < 0 ? 0 1148 : Currline - (dlines + 1) / 2, &cmdbuf[1]); 1149 pr ("vi "); pr (cmdbuf); putchar (' '); pr (fnames[fnum]); 1150 execute (filename, VI, "vi", cmdbuf, fnames[fnum], 0); 1151 break; 1152 } 1153 default: 1154 if (dum_opt) { 1155 kill_line (); 1156 if (Senter && Sexit) { 1157 tputs (Senter, 1, putch); 1158 promptlen = pr ("[Press 'h' for instructions.]") + (2 * soglitch); 1159 tputs (Sexit, 1, putch); 1160 } 1161 else 1162 promptlen = pr ("[Press 'h' for instructions.]"); 1163 fflush (stdout); 1164 } 1165 else 1166 write (2, &bell, 1); 1167 break; 1168 } 1169 if (done) break; 1170 } 1171 putchar ('\r'); 1172 endsw: 1173 inwait = 0; 1174 notell++; 1175 if (MBIT == RAW && slow_tty) { 1176 otty.sg_flags &= ~MBIT; 1177 stty(fileno(stderr), &otty); 1178 } 1179 return (retval); 1180 } 1181 1182 char ch; 1183 1184 /* 1185 * Execute a colon-prefixed command. 1186 * Returns <0 if not a command that should cause 1187 * more of the file to be printed. 1188 */ 1189 1190 colon (filename, cmd, nlines) 1191 char *filename; 1192 int cmd; 1193 int nlines; 1194 { 1195 if (cmd == 0) 1196 ch = readch (); 1197 else 1198 ch = cmd; 1199 lastcolon = ch; 1200 switch (ch) { 1201 case 'f': 1202 kill_line (); 1203 if (!no_intty) 1204 promptlen = printf ("\"%s\" line %d", fnames[fnum], Currline); 1205 else 1206 promptlen = printf ("[Not a file] line %d", Currline); 1207 fflush (stdout); 1208 return (-1); 1209 case 'n': 1210 if (nlines == 0) { 1211 if (fnum >= nfiles - 1) 1212 end_it (); 1213 nlines++; 1214 } 1215 putchar ('\r'); 1216 erase (0); 1217 skipf (nlines); 1218 return (0); 1219 case 'p': 1220 if (no_intty) { 1221 write (2, &bell, 1); 1222 return (-1); 1223 } 1224 putchar ('\r'); 1225 erase (0); 1226 if (nlines == 0) 1227 nlines++; 1228 skipf (-nlines); 1229 return (0); 1230 case '!': 1231 do_shell (filename); 1232 return (-1); 1233 case 'q': 1234 case 'Q': 1235 end_it (); 1236 default: 1237 write (2, &bell, 1); 1238 return (-1); 1239 } 1240 } 1241 1242 /* 1243 ** Read a decimal number from the terminal. Set cmd to the non-digit which 1244 ** terminates the number. 1245 */ 1246 1247 number(cmd) 1248 char *cmd; 1249 { 1250 register int i; 1251 1252 i = 0; ch = otty.sg_kill; 1253 for (;;) { 1254 ch = readch (); 1255 if (ch >= '0' && ch <= '9') 1256 i = i*10 + ch - '0'; 1257 else if (ch == otty.sg_kill) 1258 i = 0; 1259 else { 1260 *cmd = ch; 1261 break; 1262 } 1263 } 1264 return (i); 1265 } 1266 1267 do_shell (filename) 1268 char *filename; 1269 { 1270 char cmdbuf[80]; 1271 1272 kill_line (); 1273 pr ("!"); 1274 fflush (stdout); 1275 promptlen = 1; 1276 if (lastp) 1277 pr (shell_line); 1278 else { 1279 ttyin (cmdbuf, 78, '!'); 1280 if (expand (shell_line, cmdbuf)) { 1281 kill_line (); 1282 promptlen = printf ("!%s", shell_line); 1283 } 1284 } 1285 fflush (stdout); 1286 write (2, "\n", 1); 1287 promptlen = 0; 1288 shellp = 1; 1289 execute (filename, shell, shell, "-c", shell_line, 0); 1290 } 1291 1292 /* 1293 ** Search for nth ocurrence of regular expression contained in buf in the file 1294 */ 1295 1296 search (buf, file, n) 1297 char buf[]; 1298 FILE *file; 1299 register int n; 1300 { 1301 long startline = Ftell (file); 1302 register long line1 = startline; 1303 register long line2 = startline; 1304 register long line3 = startline; 1305 register int lncount; 1306 int saveln, rv, re_exec(); 1307 char *s, *re_comp(); 1308 1309 context.line = saveln = Currline; 1310 context.chrctr = startline; 1311 lncount = 0; 1312 if ((s = re_comp (buf)) != 0) 1313 error (s); 1314 while (!feof (file)) { 1315 line3 = line2; 1316 line2 = line1; 1317 line1 = Ftell (file); 1318 rdline (file); 1319 lncount++; 1320 if ((rv = re_exec (Line)) == 1) 1321 if (--n == 0) { 1322 if (lncount > 3 || (lncount > 1 && no_intty)) 1323 { 1324 pr ("\n"); 1325 if (clreol) 1326 cleareol (); 1327 pr("...skipping\n"); 1328 } 1329 if (!no_intty) { 1330 Currline -= (lncount >= 3 ? 3 : lncount); 1331 Fseek (file, line3); 1332 if (noscroll) 1333 if (clreol) { 1334 home (); 1335 cleareol (); 1336 } 1337 else 1338 doclear (); 1339 } 1340 else { 1341 kill_line (); 1342 if (noscroll) 1343 if (clreol) { 1344 home (); 1345 cleareol (); 1346 } 1347 else 1348 doclear (); 1349 pr (Line); 1350 putchar ('\n'); 1351 } 1352 break; 1353 } 1354 else if (rv == -1) 1355 error ("Regular expression botch"); 1356 } 1357 if (feof (file)) { 1358 if (!no_intty) { 1359 file->_flag &= ~_IOEOF; /* why doesn't fseek do this ??!!??! */ 1360 Currline = saveln; 1361 Fseek (file, startline); 1362 } 1363 else { 1364 pr ("\nPattern not found\n"); 1365 end_it (); 1366 } 1367 error ("Pattern not found"); 1368 } 1369 } 1370 1371 execute (filename, cmd, args) 1372 char *filename; 1373 char *cmd, *args; 1374 { 1375 int id; 1376 int n; 1377 1378 fflush (stdout); 1379 reset_tty (); 1380 for (n = 10; (id = fork ()) < 0 && n > 0; n--) 1381 sleep (5); 1382 if (id == 0) { 1383 if (!isatty(0)) { 1384 close(0); 1385 open("/dev/tty", 0); 1386 } 1387 execv (cmd, &args); 1388 write (2, "exec failed\n", 12); 1389 exit (1); 1390 } 1391 if (id > 0) { 1392 signal (SIGINT, SIG_IGN); 1393 signal (SIGQUIT, SIG_IGN); 1394 if (catch_susp) 1395 signal(SIGTSTP, SIG_DFL); 1396 while (wait(0) > 0); 1397 signal (SIGINT, end_it); 1398 signal (SIGQUIT, onquit); 1399 if (catch_susp) 1400 signal(SIGTSTP, onsusp); 1401 } else 1402 write(2, "can't fork\n", 11); 1403 set_tty (); 1404 pr ("------------------------\n"); 1405 prompt (filename); 1406 } 1407 /* 1408 ** Skip n lines in the file f 1409 */ 1410 1411 skiplns (n, f) 1412 register int n; 1413 register FILE *f; 1414 { 1415 register char c; 1416 1417 while (n > 0) { 1418 while ((c = Getc (f)) != '\n') 1419 if (c == EOF) 1420 return; 1421 n--; 1422 Currline++; 1423 } 1424 } 1425 1426 /* 1427 ** Skip nskip files in the file list (from the command line). Nskip may be 1428 ** negative. 1429 */ 1430 1431 skipf (nskip) 1432 register int nskip; 1433 { 1434 if (nskip == 0) return; 1435 if (nskip > 0) { 1436 if (fnum + nskip > nfiles - 1) 1437 nskip = nfiles - fnum - 1; 1438 } 1439 else if (within) 1440 ++fnum; 1441 fnum += nskip; 1442 if (fnum < 0) 1443 fnum = 0; 1444 pr ("\n...Skipping "); 1445 pr ("\n"); 1446 if (clreol) 1447 cleareol (); 1448 pr ("...Skipping "); 1449 pr (nskip > 0 ? "to file " : "back to file "); 1450 pr (fnames[fnum]); 1451 pr ("\n"); 1452 if (clreol) 1453 cleareol (); 1454 pr ("\n"); 1455 --fnum; 1456 } 1457 1458 /*----------------------------- Terminal I/O -------------------------------*/ 1459 1460 initterm () 1461 { 1462 char buf[TBUFSIZ]; 1463 static char clearbuf[TBUFSIZ]; 1464 char *clearptr, *padstr; 1465 int ldisc; 1466 int lmode; 1467 char *term; 1468 int tgrp; 1469 struct winsize win; 1470 1471 retry: 1472 if (!(no_tty = gtty(fileno(stdout), &otty))) { 1473 if (ioctl(fileno(stdout), TIOCLGET, &lmode) < 0) { 1474 perror("TIOCLGET"); 1475 exit(1); 1476 } 1477 docrterase = ((lmode & LCRTERA) != 0); 1478 docrtkill = ((lmode & LCRTKIL) != 0); 1479 /* 1480 * Wait until we're in the foreground before we save the 1481 * the terminal modes. 1482 */ 1483 if (ioctl(fileno(stdout), TIOCGPGRP, &tgrp) < 0) { 1484 perror("TIOCGPGRP"); 1485 exit(1); 1486 } 1487 if (tgrp != getpgrp(0)) { 1488 kill(0, SIGTTOU); 1489 goto retry; 1490 } 1491 if ((term = getenv("TERM")) == 0 || tgetent(buf, term) <= 0) { 1492 dumb++; ul_opt = 0; 1493 } 1494 else { 1495 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) < 0) { 1496 Lpp = tgetnum("li"); 1497 Mcol = tgetnum("co"); 1498 } else { 1499 if ((Lpp = win.ws_row) == 0) 1500 Lpp = tgetnum("li"); 1501 if ((Mcol = win.ws_col) == 0) 1502 Mcol = tgetnum("co"); 1503 } 1504 if ((Lpp <= 0) || tgetflag("hc")) { 1505 hard++; /* Hard copy terminal */ 1506 Lpp = 24; 1507 } 1508 if (tgetflag("xn")) 1509 eatnl++; /* Eat newline at last column + 1; dec, concept */ 1510 if (Mcol <= 0) 1511 Mcol = 80; 1512 1513 if (tailequ (fnames[0], "page") || !hard && tgetflag("ns")) 1514 noscroll++; 1515 Wrap = tgetflag("am"); 1516 bad_so = tgetflag ("xs"); 1517 clearptr = clearbuf; 1518 eraseln = tgetstr("ce",&clearptr); 1519 Clear = tgetstr("cl", &clearptr); 1520 Senter = tgetstr("so", &clearptr); 1521 Sexit = tgetstr("se", &clearptr); 1522 if ((soglitch = tgetnum("sg")) < 0) 1523 soglitch = 0; 1524 1525 /* 1526 * Set up for underlining: some terminals don't need it; 1527 * others have start/stop sequences, still others have an 1528 * underline char sequence which is assumed to move the 1529 * cursor forward one character. If underline sequence 1530 * isn't available, settle for standout sequence. 1531 */ 1532 1533 if (tgetflag("ul") || tgetflag("os")) 1534 ul_opt = 0; 1535 if ((chUL = tgetstr("uc", &clearptr)) == NULL ) 1536 chUL = ""; 1537 if (((ULenter = tgetstr("us", &clearptr)) == NULL || 1538 (ULexit = tgetstr("ue", &clearptr)) == NULL) && !*chUL) { 1539 if ((ULenter = Senter) == NULL || (ULexit = Sexit) == NULL) { 1540 ULenter = ""; 1541 ULexit = ""; 1542 } else 1543 ulglitch = soglitch; 1544 } else { 1545 if ((ulglitch = tgetnum("ug")) < 0) 1546 ulglitch = 0; 1547 } 1548 1549 if (padstr = tgetstr("pc", &clearptr)) 1550 PC = *padstr; 1551 Home = tgetstr("ho",&clearptr); 1552 if (Home == 0 || *Home == '\0') 1553 { 1554 if ((cursorm = tgetstr("cm", &clearptr)) != NULL) { 1555 strcpy(cursorhome, tgoto(cursorm, 0, 0)); 1556 Home = cursorhome; 1557 } 1558 } 1559 EodClr = tgetstr("cd", &clearptr); 1560 if ((chBS = tgetstr("bc", &clearptr)) == NULL) 1561 chBS = "\b"; 1562 1563 } 1564 if ((shell = getenv("SHELL")) == NULL) 1565 shell = "/bin/sh"; 1566 } 1567 no_intty = gtty(fileno(stdin), &otty); 1568 gtty(fileno(stderr), &otty); 1569 savetty = otty; 1570 ospeed = otty.sg_ospeed; 1571 slow_tty = ospeed < B1200; 1572 hardtabs = (otty.sg_flags & TBDELAY) != XTABS; 1573 if (!no_tty) { 1574 otty.sg_flags &= ~ECHO; 1575 if (MBIT == CBREAK || !slow_tty) 1576 otty.sg_flags |= MBIT; 1577 } 1578 } 1579 1580 readch () 1581 { 1582 char ch; 1583 extern int errno; 1584 1585 errno = 0; 1586 if (read (2, &ch, 1) <= 0) 1587 if (errno != EINTR) 1588 end_it(); 1589 else 1590 ch = otty.sg_kill; 1591 return (ch); 1592 } 1593 1594 static char BS = '\b'; 1595 static char *BSB = "\b \b"; 1596 static char CARAT = '^'; 1597 #define ERASEONECHAR \ 1598 if (docrterase) \ 1599 write (2, BSB, sizeof(BSB)); \ 1600 else \ 1601 write (2, &BS, sizeof(BS)); 1602 1603 ttyin (buf, nmax, pchar) 1604 char buf[]; 1605 register int nmax; 1606 char pchar; 1607 { 1608 register char *sptr; 1609 register char ch; 1610 register int slash = 0; 1611 int maxlen; 1612 char cbuf; 1613 1614 sptr = buf; 1615 maxlen = 0; 1616 while (sptr - buf < nmax) { 1617 if (promptlen > maxlen) maxlen = promptlen; 1618 ch = readch (); 1619 if (ch == '\\') { 1620 slash++; 1621 } 1622 else if ((ch == otty.sg_erase) && !slash) { 1623 if (sptr > buf) { 1624 --promptlen; 1625 ERASEONECHAR 1626 --sptr; 1627 if ((*sptr < ' ' && *sptr != '\n') || *sptr == RUBOUT) { 1628 --promptlen; 1629 ERASEONECHAR 1630 } 1631 continue; 1632 } 1633 else { 1634 if (!eraseln) promptlen = maxlen; 1635 longjmp (restore, 1); 1636 } 1637 } 1638 else if ((ch == otty.sg_kill) && !slash) { 1639 if (hard) { 1640 show (ch); 1641 putchar ('\n'); 1642 putchar (pchar); 1643 } 1644 else { 1645 putchar ('\r'); 1646 putchar (pchar); 1647 if (eraseln) 1648 erase (1); 1649 else if (docrtkill) 1650 while (promptlen-- > 1) 1651 write (2, BSB, sizeof(BSB)); 1652 promptlen = 1; 1653 } 1654 sptr = buf; 1655 fflush (stdout); 1656 continue; 1657 } 1658 if (slash && (ch == otty.sg_kill || ch == otty.sg_erase)) { 1659 ERASEONECHAR 1660 --sptr; 1661 } 1662 if (ch != '\\') 1663 slash = 0; 1664 *sptr++ = ch; 1665 if ((ch < ' ' && ch != '\n' && ch != ESC) || ch == RUBOUT) { 1666 ch += ch == RUBOUT ? -0100 : 0100; 1667 write (2, &CARAT, 1); 1668 promptlen++; 1669 } 1670 cbuf = ch; 1671 if (ch != '\n' && ch != ESC) { 1672 write (2, &cbuf, 1); 1673 promptlen++; 1674 } 1675 else 1676 break; 1677 } 1678 *--sptr = '\0'; 1679 if (!eraseln) promptlen = maxlen; 1680 if (sptr - buf >= nmax - 1) 1681 error ("Line too long"); 1682 } 1683 1684 expand (outbuf, inbuf) 1685 char *outbuf; 1686 char *inbuf; 1687 { 1688 register char *instr; 1689 register char *outstr; 1690 register char ch; 1691 char temp[200]; 1692 int changed = 0; 1693 1694 instr = inbuf; 1695 outstr = temp; 1696 while ((ch = *instr++) != '\0') 1697 switch (ch) { 1698 case '%': 1699 if (!no_intty) { 1700 strcpy (outstr, fnames[fnum]); 1701 outstr += strlen (fnames[fnum]); 1702 changed++; 1703 } 1704 else 1705 *outstr++ = ch; 1706 break; 1707 case '!': 1708 if (!shellp) 1709 error ("No previous command to substitute for"); 1710 strcpy (outstr, shell_line); 1711 outstr += strlen (shell_line); 1712 changed++; 1713 break; 1714 case '\\': 1715 if (*instr == '%' || *instr == '!') { 1716 *outstr++ = *instr++; 1717 break; 1718 } 1719 default: 1720 *outstr++ = ch; 1721 } 1722 *outstr++ = '\0'; 1723 strcpy (outbuf, temp); 1724 return (changed); 1725 } 1726 1727 show (ch) 1728 register char ch; 1729 { 1730 char cbuf; 1731 1732 if ((ch < ' ' && ch != '\n' && ch != ESC) || ch == RUBOUT) { 1733 ch += ch == RUBOUT ? -0100 : 0100; 1734 write (2, &CARAT, 1); 1735 promptlen++; 1736 } 1737 cbuf = ch; 1738 write (2, &cbuf, 1); 1739 promptlen++; 1740 } 1741 1742 error (mess) 1743 char *mess; 1744 { 1745 if (clreol) 1746 cleareol (); 1747 else 1748 kill_line (); 1749 promptlen += strlen (mess); 1750 if (Senter && Sexit) { 1751 tputs (Senter, 1, putch); 1752 pr(mess); 1753 tputs (Sexit, 1, putch); 1754 } 1755 else 1756 pr (mess); 1757 fflush(stdout); 1758 errors++; 1759 longjmp (restore, 1); 1760 } 1761 1762 1763 set_tty () 1764 { 1765 otty.sg_flags |= MBIT; 1766 otty.sg_flags &= ~ECHO; 1767 stty(fileno(stderr), &otty); 1768 } 1769 1770 reset_tty () 1771 { 1772 if (no_tty) 1773 return; 1774 if (pstate) { 1775 tputs(ULexit, 1, putch); 1776 fflush(stdout); 1777 pstate = 0; 1778 } 1779 otty.sg_flags |= ECHO; 1780 otty.sg_flags &= ~MBIT; 1781 stty(fileno(stderr), &savetty); 1782 } 1783 1784 rdline (f) 1785 register FILE *f; 1786 { 1787 register char c; 1788 register char *p; 1789 1790 p = Line; 1791 while ((c = Getc (f)) != '\n' && c != EOF && p - Line < LINSIZ - 1) 1792 *p++ = c; 1793 if (c == '\n') 1794 Currline++; 1795 *p = '\0'; 1796 } 1797 1798 /* Come here when we get a suspend signal from the terminal */ 1799 1800 onsusp () 1801 { 1802 /* ignore SIGTTOU so we don't get stopped if csh grabs the tty */ 1803 signal(SIGTTOU, SIG_IGN); 1804 reset_tty (); 1805 fflush (stdout); 1806 signal(SIGTTOU, SIG_DFL); 1807 /* Send the TSTP signal to suspend our process group */ 1808 signal(SIGTSTP, SIG_DFL); 1809 sigsetmask(0); 1810 kill (0, SIGTSTP); 1811 /* Pause for station break */ 1812 1813 /* We're back */ 1814 signal (SIGTSTP, onsusp); 1815 set_tty (); 1816 if (inwait) 1817 longjmp (restore); 1818 } 1819