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 char copyright[] = 9 "@(#) Copyright (c) 1980 Regents of the University of California.\n\ 10 All rights reserved.\n"; 11 #endif not lint 12 13 #ifndef lint 14 static char sccsid[] = "@(#)more.c 5.4.1.1 (Berkeley) 10/21/86"; 15 #endif not lint 16 17 /* 18 ** more.c - General purpose tty output filter and file perusal program 19 ** 20 ** by Eric Shienbrood, UC Berkeley 21 ** 22 ** modified by Geoff Peck, UCB to add underlining, single spacing 23 ** modified by John Foderaro, UCB to add -c and MORE environment variable 24 */ 25 26 #include <stdio.h> 27 #include <sys/types.h> 28 #include <ctype.h> 29 #include <signal.h> 30 #include <errno.h> 31 #include <sgtty.h> 32 #include <setjmp.h> 33 #include <sys/stat.h> 34 #include <sys/file.h> 35 #include <sys/exec.h> 36 37 #define HELPFILE "/usr/lib/more.help" 38 #define VI "/usr/ucb/vi" 39 40 #define Fopen(s,m) (Currline = 0,file_pos=0,fopen(s,m)) 41 #define Ftell(f) file_pos 42 #define Fseek(f,off) (file_pos=off,fseek(f,off,0)) 43 #define Getc(f) (++file_pos, getc(f)) 44 #define Ungetc(c,f) (--file_pos, ungetc(c,f)) 45 46 #define MBIT CBREAK 47 #define stty(fd,argp) ioctl(fd,TIOCSETN,argp) 48 49 #define TBUFSIZ 1024 50 #define LINSIZ 256 51 #define ctrl(letter) ('letter' & 077) 52 #define RUBOUT '\177' 53 #define ESC '\033' 54 #define QUIT '\034' 55 56 struct sgttyb otty, savetty; 57 long file_pos, file_size; 58 int fnum, no_intty, no_tty, slow_tty; 59 int dum_opt, dlines, onquit(), end_it(), chgwinsz(); 60 int onsusp(); 61 int nscroll = 11; /* Number of lines scrolled by 'd' */ 62 int fold_opt = 1; /* Fold long lines */ 63 int stop_opt = 1; /* Stop after form feeds */ 64 int ssp_opt = 0; /* Suppress white space */ 65 int ul_opt = 1; /* Underline as best we can */ 66 int promptlen; 67 int Currline; /* Line we are currently at */ 68 int startup = 1; 69 int firstf = 1; 70 int notell = 1; 71 int docrterase = 0; 72 int docrtkill = 0; 73 int bad_so; /* True if overwriting does not turn off standout */ 74 int inwait, Pause, errors; 75 int within; /* true if we are within a file, 76 false if we are between files */ 77 int hard, dumb, noscroll, hardtabs, clreol; 78 int catch_susp; /* We should catch the SIGTSTP signal */ 79 char **fnames; /* The list of file names */ 80 int nfiles; /* Number of files left to process */ 81 char *shell; /* The name of the shell to use */ 82 int shellp; /* A previous shell command exists */ 83 char ch; 84 jmp_buf restore; 85 char Line[LINSIZ]; /* Line buffer */ 86 int Lpp = 24; /* lines per page */ 87 char *Clear; /* clear screen */ 88 char *eraseln; /* erase line */ 89 char *Senter, *Sexit;/* enter and exit standout mode */ 90 char *ULenter, *ULexit; /* enter and exit underline mode */ 91 char *chUL; /* underline character */ 92 char *chBS; /* backspace character */ 93 char *Home; /* go to home */ 94 char *cursorm; /* cursor movement */ 95 char cursorhome[40]; /* contains cursor movement to home */ 96 char *EodClr; /* clear rest of screen */ 97 char *tgetstr(); 98 int Mcol = 80; /* number of columns */ 99 int Wrap = 1; /* set if automargins */ 100 int soglitch; /* terminal has standout mode glitch */ 101 int ulglitch; /* terminal has underline mode glitch */ 102 int pstate = 0; /* current UL state */ 103 long fseek(); 104 char *getenv(); 105 struct { 106 long chrctr, line; 107 } context, screen_start; 108 extern char PC; /* pad character */ 109 extern short ospeed; 110 111 112 main(argc, argv) 113 int argc; 114 char *argv[]; 115 { 116 register FILE *f; 117 register char *s; 118 register char *p; 119 register char ch; 120 register int left; 121 int prnames = 0; 122 int initopt = 0; 123 int srchopt = 0; 124 int clearit = 0; 125 int initline; 126 char initbuf[80]; 127 FILE *checkf(); 128 129 nfiles = argc; 130 fnames = argv; 131 initterm (); 132 nscroll = Lpp/2 - 1; 133 if (nscroll <= 0) 134 nscroll = 1; 135 if(s = getenv("MORE")) argscan(s); 136 while (--nfiles > 0) { 137 if ((ch = (*++fnames)[0]) == '-') { 138 argscan(*fnames+1); 139 } 140 else if (ch == '+') { 141 s = *fnames; 142 if (*++s == '/') { 143 srchopt++; 144 for (++s, p = initbuf; p < initbuf + 79 && *s != '\0';) 145 *p++ = *s++; 146 *p = '\0'; 147 } 148 else { 149 initopt++; 150 for (initline = 0; *s != '\0'; s++) 151 if (isdigit (*s)) 152 initline = initline*10 + *s -'0'; 153 --initline; 154 } 155 } 156 else break; 157 } 158 /* allow clreol only if Home and eraseln and EodClr strings are 159 * defined, and in that case, make sure we are in noscroll mode 160 */ 161 if(clreol) 162 { 163 if((Home == NULL) || (*Home == '\0') || 164 (eraseln == NULL) || (*eraseln == '\0') || 165 (EodClr == NULL) || (*EodClr == '\0') ) 166 clreol = 0; 167 else noscroll = 1; 168 } 169 if (dlines == 0) 170 dlines = Lpp - (noscroll ? 1 : 2); 171 left = dlines; 172 if (nfiles > 1) 173 prnames++; 174 if (!no_intty && nfiles == 0) { 175 fputs("Usage: ",stderr); 176 fputs(argv[0],stderr); 177 fputs(" [-dfln] [+linenum | +/pattern] name1 name2 ...\n",stderr); 178 exit(1); 179 } 180 else 181 f = stdin; 182 if (!no_tty) { 183 signal(SIGQUIT, onquit); 184 signal(SIGINT, end_it); 185 signal(SIGWINCH, chgwinsz); 186 if (signal (SIGTSTP, SIG_IGN) == SIG_DFL) { 187 signal(SIGTSTP, onsusp); 188 catch_susp++; 189 } 190 stty (fileno(stderr), &otty); 191 } 192 if (no_intty) { 193 if (no_tty) 194 copy_file (stdin); 195 else { 196 if ((ch = Getc (f)) == '\f') 197 doclear(); 198 else { 199 Ungetc (ch, f); 200 if (noscroll && (ch != EOF)) { 201 if (clreol) 202 home (); 203 else 204 doclear (); 205 } 206 } 207 if (srchopt) 208 { 209 search (initbuf, stdin, 1); 210 if (noscroll) 211 left--; 212 } 213 else if (initopt) 214 skiplns (initline, stdin); 215 screen (stdin, left); 216 } 217 no_intty = 0; 218 prnames++; 219 firstf = 0; 220 } 221 222 while (fnum < nfiles) { 223 if ((f = checkf (fnames[fnum], &clearit)) != NULL) { 224 context.line = context.chrctr = 0; 225 Currline = 0; 226 if (firstf) setjmp (restore); 227 if (firstf) { 228 firstf = 0; 229 if (srchopt) 230 { 231 search (initbuf, f, 1); 232 if (noscroll) 233 left--; 234 } 235 else if (initopt) 236 skiplns (initline, f); 237 } 238 else if (fnum < nfiles && !no_tty) { 239 setjmp (restore); 240 left = command (fnames[fnum], f); 241 } 242 if (left != 0) { 243 if ((noscroll || clearit) && (file_size != 0x7fffffffffffffffL)) 244 if (clreol) 245 home (); 246 else 247 doclear (); 248 if (prnames) { 249 if (bad_so) 250 erase (0); 251 if (clreol) 252 cleareol (); 253 pr("::::::::::::::"); 254 if (promptlen > 14) 255 erase (14); 256 printf ("\n"); 257 if(clreol) cleareol(); 258 printf("%s\n", fnames[fnum]); 259 if(clreol) cleareol(); 260 printf("::::::::::::::\n", fnames[fnum]); 261 if (left > Lpp - 4) 262 left = Lpp - 4; 263 } 264 if (no_tty) 265 copy_file (f); 266 else { 267 within++; 268 screen(f, left); 269 within = 0; 270 } 271 } 272 setjmp (restore); 273 fflush(stdout); 274 fclose(f); 275 screen_start.line = screen_start.chrctr = 0L; 276 context.line = context.chrctr = 0L; 277 } 278 fnum++; 279 firstf = 0; 280 } 281 reset_tty (); 282 exit(0); 283 } 284 285 argscan(s) 286 char *s; 287 { 288 for (dlines = 0; *s != '\0'; s++) 289 { 290 switch (*s) 291 { 292 case '0': case '1': case '2': 293 case '3': case '4': case '5': 294 case '6': case '7': case '8': 295 case '9': 296 dlines = dlines*10 + *s - '0'; 297 break; 298 case 'd': 299 dum_opt = 1; 300 break; 301 case 'l': 302 stop_opt = 0; 303 break; 304 case 'f': 305 fold_opt = 0; 306 break; 307 case 'p': 308 noscroll++; 309 break; 310 case 'c': 311 clreol++; 312 break; 313 case 's': 314 ssp_opt = 1; 315 break; 316 case 'u': 317 ul_opt = 0; 318 break; 319 } 320 } 321 } 322 323 324 /* 325 ** Check whether the file named by fs is an ASCII file which the user may 326 ** access. If it is, return the opened file. Otherwise return NULL. 327 */ 328 329 FILE * 330 checkf (fs, clearfirst) 331 register char *fs; 332 int *clearfirst; 333 { 334 struct stat stbuf; 335 register FILE *f; 336 char c; 337 338 if (stat (fs, &stbuf) == -1) { 339 fflush(stdout); 340 if (clreol) 341 cleareol (); 342 perror(fs); 343 return (NULL); 344 } 345 if ((stbuf.st_mode & S_IFMT) == S_IFDIR) { 346 printf("\n*** %s: directory ***\n\n", fs); 347 return (NULL); 348 } 349 if ((f=Fopen(fs, "r")) == NULL) { 350 fflush(stdout); 351 perror(fs); 352 return (NULL); 353 } 354 /* Try to see whether it is an ASCII file */ 355 if (magic(f)) { 356 printf("\n******** %s: Not a text file ********\n\n", fs); 357 fclose (f); 358 return (NULL); 359 } 360 c = Getc(f); 361 if (c == '\f') 362 *clearfirst = 1; 363 else { 364 *clearfirst = 0; 365 Ungetc (c, f); 366 } 367 if ((file_size = stbuf.st_size) == 0) 368 file_size = 0x7fffffffffffffffL; 369 return (f); 370 } 371 372 /* 373 * Check for file magic numbers. This code would best 374 * be shared with the file(1) program or, perhaps, more 375 * should not try and be so smart? 376 */ 377 magic(f) 378 FILE *f; 379 { 380 long magic; 381 382 magic = getw(f); 383 fseek(f, -sizeof (magic), L_INCR); /* reset file position */ 384 return (magic == 0405 || magic == OMAGIC || magic == NMAGIC || 385 magic == 0411 || magic == ZMAGIC || magic == 0177545); 386 } 387 388 /* 389 ** A real function, for the tputs routine in termlib 390 */ 391 392 putch (ch) 393 char ch; 394 { 395 putchar (ch); 396 } 397 398 /* 399 ** Print out the contents of the file f, one screenful at a time. 400 */ 401 402 #define STOP -10 403 404 screen (f, num_lines) 405 register FILE *f; 406 register int num_lines; 407 { 408 register int c; 409 register int nchars; 410 int length; /* length of current line */ 411 static int prev_len = 1; /* length of previous line */ 412 413 for (;;) { 414 while (num_lines > 0 && !Pause) { 415 if ((nchars = getline (f, &length)) == EOF) 416 { 417 if (clreol) 418 clreos(); 419 return; 420 } 421 if (ssp_opt && length == 0 && prev_len == 0) 422 continue; 423 prev_len = length; 424 if (bad_so || (Senter && *Senter == ' ') && promptlen > 0) 425 erase (0); 426 /* must clear before drawing line since tabs on some terminals 427 * do not erase what they tab over. 428 */ 429 if (clreol) 430 cleareol (); 431 prbuf (Line, length); 432 if (nchars < promptlen) 433 erase (nchars); /* erase () sets promptlen to 0 */ 434 else promptlen = 0; 435 /* is this needed? 436 * if (clreol) 437 * cleareol(); /* must clear again in case we wrapped * 438 */ 439 if (nchars < Mcol || !fold_opt) 440 prbuf("\n", 1); /* will turn off UL if necessary */ 441 if (nchars == STOP) 442 break; 443 num_lines--; 444 } 445 if (pstate) { 446 tputs(ULexit, 1, putch); 447 pstate = 0; 448 } 449 fflush(stdout); 450 if ((c = Getc(f)) == EOF) 451 { 452 if (clreol) 453 clreos (); 454 return; 455 } 456 457 if (Pause && clreol) 458 clreos (); 459 Ungetc (c, f); 460 setjmp (restore); 461 Pause = 0; startup = 0; 462 if ((num_lines = command (NULL, f)) == 0) 463 return; 464 if (hard && promptlen > 0) 465 erase (0); 466 if (noscroll && num_lines >= dlines) 467 { 468 if (clreol) 469 home(); 470 else 471 doclear (); 472 } 473 screen_start.line = Currline; 474 screen_start.chrctr = Ftell (f); 475 } 476 } 477 478 /* 479 ** Come here if a quit signal is received 480 */ 481 482 onquit() 483 { 484 signal(SIGQUIT, SIG_IGN); 485 if (!inwait) { 486 putchar ('\n'); 487 if (!startup) { 488 signal(SIGQUIT, onquit); 489 longjmp (restore, 1); 490 } 491 else 492 Pause++; 493 } 494 else if (!dum_opt && notell) { 495 write (2, "[Use q or Q to quit]", 20); 496 promptlen += 20; 497 notell = 0; 498 } 499 signal(SIGQUIT, onquit); 500 } 501 502 /* 503 ** Come here if a signal for a window size change is received 504 */ 505 506 chgwinsz() 507 { 508 struct winsize win; 509 510 (void) signal(SIGWINCH, SIG_IGN); 511 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) != -1) { 512 if (win.ws_row != 0) { 513 Lpp = win.ws_row; 514 nscroll = Lpp/2 - 1; 515 if (nscroll <= 0) 516 nscroll = 1; 517 dlines = Lpp - (noscroll ? 1 : 2); 518 } 519 if (win.ws_col != 0) 520 Mcol = win.ws_col; 521 } 522 (void) signal(SIGWINCH, chgwinsz); 523 } 524 525 /* 526 ** Clean up terminal state and exit. Also come here if interrupt signal received 527 */ 528 529 end_it () 530 { 531 532 reset_tty (); 533 if (clreol) { 534 putchar ('\r'); 535 clreos (); 536 fflush (stdout); 537 } 538 else if (!clreol && (promptlen > 0)) { 539 kill_line (); 540 fflush (stdout); 541 } 542 else 543 write (2, "\n", 1); 544 _exit(0); 545 } 546 547 copy_file(f) 548 register FILE *f; 549 { 550 register int c; 551 552 while ((c = getc(f)) != EOF) 553 putchar(c); 554 } 555 556 /* Simplified printf function */ 557 558 printf (fmt, args) 559 register char *fmt; 560 int args; 561 { 562 register int *argp; 563 register char ch; 564 register int ccount; 565 566 ccount = 0; 567 argp = &args; 568 while (*fmt) { 569 while ((ch = *fmt++) != '%') { 570 if (ch == '\0') 571 return (ccount); 572 ccount++; 573 putchar (ch); 574 } 575 switch (*fmt++) { 576 case 'd': 577 ccount += printd (*argp); 578 break; 579 case 's': 580 ccount += pr ((char *)*argp); 581 break; 582 case '%': 583 ccount++; 584 argp--; 585 putchar ('%'); 586 break; 587 case '0': 588 return (ccount); 589 default: 590 break; 591 } 592 ++argp; 593 } 594 return (ccount); 595 596 } 597 598 /* 599 ** Print an integer as a string of decimal digits, 600 ** returning the length of the print representation. 601 */ 602 603 printd (n) 604 int n; 605 { 606 int a, nchars; 607 608 if (a = n/10) 609 nchars = 1 + printd(a); 610 else 611 nchars = 1; 612 putchar (n % 10 + '0'); 613 return (nchars); 614 } 615 616 /* Put the print representation of an integer into a string */ 617 static char *sptr; 618 619 scanstr (n, str) 620 int n; 621 char *str; 622 { 623 sptr = str; 624 Sprintf (n); 625 *sptr = '\0'; 626 } 627 628 Sprintf (n) 629 { 630 int a; 631 632 if (a = n/10) 633 Sprintf (a); 634 *sptr++ = n % 10 + '0'; 635 } 636 637 static char bell = ctrl(G); 638 639 strlen (s) 640 char *s; 641 { 642 register char *p; 643 644 p = s; 645 while (*p++) 646 ; 647 return (p - s - 1); 648 } 649 650 /* See whether the last component of the path name "path" is equal to the 651 ** string "string" 652 */ 653 654 tailequ (path, string) 655 char *path; 656 register char *string; 657 { 658 register char *tail; 659 660 tail = path + strlen(path); 661 while (tail >= path) 662 if (*(--tail) == '/') 663 break; 664 ++tail; 665 while (*tail++ == *string++) 666 if (*tail == '\0') 667 return(1); 668 return(0); 669 } 670 671 prompt (filename) 672 char *filename; 673 { 674 if (clreol) 675 cleareol (); 676 else if (promptlen > 0) 677 kill_line (); 678 if (!hard) { 679 promptlen = 8; 680 if (Senter && Sexit) { 681 tputs (Senter, 1, putch); 682 promptlen += (2 * soglitch); 683 } 684 if (clreol) 685 cleareol (); 686 pr("--More--"); 687 if (filename != NULL) { 688 promptlen += printf ("(Next file: %s)", filename); 689 } 690 else if (!no_intty) { 691 promptlen += printf ("(%d%%)", (int)((file_pos * 100) / file_size)); 692 } 693 if (dum_opt) { 694 promptlen += pr("[Press space to continue, 'q' to quit.]"); 695 } 696 if (Senter && Sexit) 697 tputs (Sexit, 1, putch); 698 if (clreol) 699 clreos (); 700 fflush(stdout); 701 } 702 else 703 write (2, &bell, 1); 704 inwait++; 705 } 706 707 /* 708 ** Get a logical line 709 */ 710 711 getline(f, length) 712 register FILE *f; 713 int *length; 714 { 715 register int c; 716 register char *p; 717 register int column; 718 static int colflg; 719 720 p = Line; 721 column = 0; 722 c = Getc (f); 723 if (colflg && c == '\n') { 724 Currline++; 725 c = Getc (f); 726 } 727 while (p < &Line[LINSIZ - 1]) { 728 if (c == EOF) { 729 if (p > Line) { 730 *p = '\0'; 731 *length = p - Line; 732 return (column); 733 } 734 *length = p - Line; 735 return (EOF); 736 } 737 if (c == '\n') { 738 Currline++; 739 break; 740 } 741 *p++ = c; 742 if (c == '\t') 743 if (hardtabs && column < promptlen && !hard) { 744 if (eraseln && !dumb) { 745 column = 1 + (column | 7); 746 tputs (eraseln, 1, putch); 747 promptlen = 0; 748 } 749 else { 750 for (--p; column & 7 && p < &Line[LINSIZ - 1]; column++) { 751 *p++ = ' '; 752 } 753 if (column >= promptlen) promptlen = 0; 754 } 755 } 756 else 757 column = 1 + (column | 7); 758 else if (c == '\b' && column > 0) 759 column--; 760 else if (c == '\r') 761 column = 0; 762 else if (c == '\f' && stop_opt) { 763 p[-1] = '^'; 764 *p++ = 'L'; 765 column += 2; 766 Pause++; 767 } 768 else if (c == EOF) { 769 *length = p - Line; 770 return (column); 771 } 772 else if (c >= ' ' && c != RUBOUT) 773 column++; 774 if (column >= Mcol && fold_opt) break; 775 c = Getc (f); 776 } 777 if (column >= Mcol && Mcol > 0) { 778 if (!Wrap) { 779 *p++ = '\n'; 780 } 781 } 782 colflg = column == Mcol && fold_opt; 783 *length = p - Line; 784 *p = 0; 785 return (column); 786 } 787 788 /* 789 ** Erase the rest of the prompt, assuming we are starting at column col. 790 */ 791 792 erase (col) 793 register int col; 794 { 795 796 if (promptlen == 0) 797 return; 798 if (hard) { 799 putchar ('\n'); 800 } 801 else { 802 if (col == 0) 803 putchar ('\r'); 804 if (!dumb && eraseln) 805 tputs (eraseln, 1, putch); 806 else 807 for (col = promptlen - col; col > 0; col--) 808 putchar (' '); 809 } 810 promptlen = 0; 811 } 812 813 /* 814 ** Erase the current line entirely 815 */ 816 817 kill_line () 818 { 819 erase (0); 820 if (!eraseln || dumb) putchar ('\r'); 821 } 822 823 /* 824 * force clear to end of line 825 */ 826 cleareol() 827 { 828 tputs(eraseln, 1, putch); 829 } 830 831 clreos() 832 { 833 tputs(EodClr, 1, putch); 834 } 835 836 /* 837 ** Print string and return number of characters 838 */ 839 840 pr(s1) 841 char *s1; 842 { 843 register char *s; 844 register char c; 845 846 for (s = s1; c = *s++; ) 847 putchar(c); 848 return (s - s1 - 1); 849 } 850 851 852 /* Print a buffer of n characters */ 853 854 prbuf (s, n) 855 register char *s; 856 register int n; 857 { 858 register char c; /* next output character */ 859 register int state; /* next output char's UL state */ 860 #define wouldul(s,n) ((n) >= 2 && (((s)[0] == '_' && (s)[1] == '\b') || ((s)[1] == '\b' && (s)[2] == '_'))) 861 862 while (--n >= 0) 863 if (!ul_opt) 864 putchar (*s++); 865 else { 866 if (*s == ' ' && pstate == 0 && ulglitch && wouldul(s+1, n-1)) { 867 s++; 868 continue; 869 } 870 if (state = wouldul(s, n)) { 871 c = (*s == '_')? s[2] : *s ; 872 n -= 2; 873 s += 3; 874 } else 875 c = *s++; 876 if (state != pstate) { 877 if (c == ' ' && state == 0 && ulglitch && wouldul(s, n-1)) 878 state = 1; 879 else 880 tputs(state ? ULenter : ULexit, 1, putch); 881 } 882 if (c != ' ' || pstate == 0 || state != 0 || ulglitch == 0) 883 putchar(c); 884 if (state && *chUL) { 885 pr(chBS); 886 tputs(chUL, 1, putch); 887 } 888 pstate = state; 889 } 890 } 891 892 /* 893 ** Clear the screen 894 */ 895 896 doclear() 897 { 898 if (Clear && !hard) { 899 tputs(Clear, 1, putch); 900 901 /* Put out carriage return so that system doesn't 902 ** get confused by escape sequences when expanding tabs 903 */ 904 putchar ('\r'); 905 promptlen = 0; 906 } 907 } 908 909 /* 910 * Go to home position 911 */ 912 home() 913 { 914 tputs(Home,1,putch); 915 } 916 917 static int lastcmd, lastarg, lastp; 918 static int lastcolon; 919 char shell_line[132]; 920 921 /* 922 ** Read a command and do it. A command consists of an optional integer 923 ** argument followed by the command character. Return the number of lines 924 ** to display in the next screenful. If there is nothing more to display 925 ** in the current file, zero is returned. 926 */ 927 928 command (filename, f) 929 char *filename; 930 register FILE *f; 931 { 932 register int nlines; 933 register int retval; 934 register char c; 935 char colonch; 936 FILE *helpf; 937 int done; 938 char comchar, cmdbuf[80], *p; 939 940 #define ret(val) retval=val;done++;break 941 942 done = 0; 943 if (!errors) 944 prompt (filename); 945 else 946 errors = 0; 947 if (MBIT == RAW && slow_tty) { 948 otty.sg_flags |= MBIT; 949 stty(fileno(stderr), &otty); 950 } 951 for (;;) { 952 nlines = number (&comchar); 953 lastp = colonch = 0; 954 if (comchar == '.') { /* Repeat last command */ 955 lastp++; 956 comchar = lastcmd; 957 nlines = lastarg; 958 if (lastcmd == ':') 959 colonch = lastcolon; 960 } 961 lastcmd = comchar; 962 lastarg = nlines; 963 if (comchar == otty.sg_erase) { 964 kill_line (); 965 prompt (filename); 966 continue; 967 } 968 switch (comchar) { 969 case ':': 970 retval = colon (filename, colonch, nlines); 971 if (retval >= 0) 972 done++; 973 break; 974 case 'b': 975 case ctrl(B): 976 { 977 register int initline; 978 979 if (no_intty) { 980 write(2, &bell, 1); 981 return (-1); 982 } 983 984 if (nlines == 0) nlines++; 985 986 putchar ('\r'); 987 erase (0); 988 printf ("\n"); 989 if (clreol) 990 cleareol (); 991 printf ("...back %d page", nlines); 992 if (nlines > 1) 993 pr ("s\n"); 994 else 995 pr ("\n"); 996 997 if (clreol) 998 cleareol (); 999 pr ("\n"); 1000 1001 initline = Currline - dlines * (nlines + 1); 1002 if (! noscroll) 1003 --initline; 1004 if (initline < 0) initline = 0; 1005 Fseek(f, 0L); 1006 Currline = 0; /* skiplns() will make Currline correct */ 1007 skiplns(initline, f); 1008 if (! noscroll) { 1009 ret(dlines + 1); 1010 } 1011 else { 1012 ret(dlines); 1013 } 1014 } 1015 case ' ': 1016 case 'z': 1017 if (nlines == 0) nlines = dlines; 1018 else if (comchar == 'z') dlines = nlines; 1019 ret (nlines); 1020 case 'd': 1021 case ctrl(D): 1022 if (nlines != 0) nscroll = nlines; 1023 ret (nscroll); 1024 case 'q': 1025 case 'Q': 1026 end_it (); 1027 case 's': 1028 case 'f': 1029 if (nlines == 0) nlines++; 1030 if (comchar == 'f') 1031 nlines *= dlines; 1032 putchar ('\r'); 1033 erase (0); 1034 printf ("\n"); 1035 if (clreol) 1036 cleareol (); 1037 printf ("...skipping %d line", nlines); 1038 if (nlines > 1) 1039 pr ("s\n"); 1040 else 1041 pr ("\n"); 1042 1043 if (clreol) 1044 cleareol (); 1045 pr ("\n"); 1046 1047 while (nlines > 0) { 1048 while ((c = Getc (f)) != '\n') 1049 if (c == EOF) { 1050 retval = 0; 1051 done++; 1052 goto endsw; 1053 } 1054 Currline++; 1055 nlines--; 1056 } 1057 ret (dlines); 1058 case '\n': 1059 if (nlines != 0) 1060 dlines = nlines; 1061 else 1062 nlines = 1; 1063 ret (nlines); 1064 case '\f': 1065 if (!no_intty) { 1066 doclear (); 1067 Fseek (f, screen_start.chrctr); 1068 Currline = screen_start.line; 1069 ret (dlines); 1070 } 1071 else { 1072 write (2, &bell, 1); 1073 break; 1074 } 1075 case '\'': 1076 if (!no_intty) { 1077 kill_line (); 1078 pr ("\n***Back***\n\n"); 1079 Fseek (f, context.chrctr); 1080 Currline = context.line; 1081 ret (dlines); 1082 } 1083 else { 1084 write (2, &bell, 1); 1085 break; 1086 } 1087 case '=': 1088 kill_line (); 1089 promptlen = printd (Currline); 1090 fflush (stdout); 1091 break; 1092 case 'n': 1093 lastp++; 1094 case '/': 1095 if (nlines == 0) nlines++; 1096 kill_line (); 1097 pr ("/"); 1098 promptlen = 1; 1099 fflush (stdout); 1100 if (lastp) { 1101 write (2,"\r", 1); 1102 search (NULL, f, nlines); /* Use previous r.e. */ 1103 } 1104 else { 1105 ttyin (cmdbuf, 78, '/'); 1106 write (2, "\r", 1); 1107 search (cmdbuf, f, nlines); 1108 } 1109 ret (dlines-1); 1110 case '!': 1111 do_shell (filename); 1112 break; 1113 case '?': 1114 case 'h': 1115 if ((helpf = fopen (HELPFILE, "r")) == NULL) 1116 error ("Can't open help file"); 1117 if (noscroll) doclear (); 1118 copy_file (helpf); 1119 fclose (helpf); 1120 prompt (filename); 1121 break; 1122 case 'v': /* This case should go right before default */ 1123 if (!no_intty) { 1124 kill_line (); 1125 cmdbuf[0] = '+'; 1126 scanstr (Currline - dlines < 0 ? 0 1127 : Currline - (dlines + 1) / 2, &cmdbuf[1]); 1128 pr ("vi "); pr (cmdbuf); putchar (' '); pr (fnames[fnum]); 1129 execute (filename, VI, "vi", cmdbuf, fnames[fnum], 0); 1130 break; 1131 } 1132 default: 1133 if (dum_opt) { 1134 kill_line (); 1135 if (Senter && Sexit) { 1136 tputs (Senter, 1, putch); 1137 promptlen = pr ("[Press 'h' for instructions.]") + (2 * soglitch); 1138 tputs (Sexit, 1, putch); 1139 } 1140 else 1141 promptlen = pr ("[Press 'h' for instructions.]"); 1142 fflush (stdout); 1143 } 1144 else 1145 write (2, &bell, 1); 1146 break; 1147 } 1148 if (done) break; 1149 } 1150 putchar ('\r'); 1151 endsw: 1152 inwait = 0; 1153 notell++; 1154 if (MBIT == RAW && slow_tty) { 1155 otty.sg_flags &= ~MBIT; 1156 stty(fileno(stderr), &otty); 1157 } 1158 return (retval); 1159 } 1160 1161 char ch; 1162 1163 /* 1164 * Execute a colon-prefixed command. 1165 * Returns <0 if not a command that should cause 1166 * more of the file to be printed. 1167 */ 1168 1169 colon (filename, cmd, nlines) 1170 char *filename; 1171 int cmd; 1172 int nlines; 1173 { 1174 if (cmd == 0) 1175 ch = readch (); 1176 else 1177 ch = cmd; 1178 lastcolon = ch; 1179 switch (ch) { 1180 case 'f': 1181 kill_line (); 1182 if (!no_intty) 1183 promptlen = printf ("\"%s\" line %d", fnames[fnum], Currline); 1184 else 1185 promptlen = printf ("[Not a file] line %d", Currline); 1186 fflush (stdout); 1187 return (-1); 1188 case 'n': 1189 if (nlines == 0) { 1190 if (fnum >= nfiles - 1) 1191 end_it (); 1192 nlines++; 1193 } 1194 putchar ('\r'); 1195 erase (0); 1196 skipf (nlines); 1197 return (0); 1198 case 'p': 1199 if (no_intty) { 1200 write (2, &bell, 1); 1201 return (-1); 1202 } 1203 putchar ('\r'); 1204 erase (0); 1205 if (nlines == 0) 1206 nlines++; 1207 skipf (-nlines); 1208 return (0); 1209 case '!': 1210 do_shell (filename); 1211 return (-1); 1212 case 'q': 1213 case 'Q': 1214 end_it (); 1215 default: 1216 write (2, &bell, 1); 1217 return (-1); 1218 } 1219 } 1220 1221 /* 1222 ** Read a decimal number from the terminal. Set cmd to the non-digit which 1223 ** terminates the number. 1224 */ 1225 1226 number(cmd) 1227 char *cmd; 1228 { 1229 register int i; 1230 1231 i = 0; ch = otty.sg_kill; 1232 for (;;) { 1233 ch = readch (); 1234 if (ch >= '0' && ch <= '9') 1235 i = i*10 + ch - '0'; 1236 else if (ch == otty.sg_kill) 1237 i = 0; 1238 else { 1239 *cmd = ch; 1240 break; 1241 } 1242 } 1243 return (i); 1244 } 1245 1246 do_shell (filename) 1247 char *filename; 1248 { 1249 char cmdbuf[80]; 1250 1251 kill_line (); 1252 pr ("!"); 1253 fflush (stdout); 1254 promptlen = 1; 1255 if (lastp) 1256 pr (shell_line); 1257 else { 1258 ttyin (cmdbuf, 78, '!'); 1259 if (expand (shell_line, cmdbuf)) { 1260 kill_line (); 1261 promptlen = printf ("!%s", shell_line); 1262 } 1263 } 1264 fflush (stdout); 1265 write (2, "\n", 1); 1266 promptlen = 0; 1267 shellp = 1; 1268 execute (filename, shell, shell, "-c", shell_line, 0); 1269 } 1270 1271 /* 1272 ** Search for nth ocurrence of regular expression contained in buf in the file 1273 */ 1274 1275 search (buf, file, n) 1276 char buf[]; 1277 FILE *file; 1278 register int n; 1279 { 1280 long startline = Ftell (file); 1281 register long line1 = startline; 1282 register long line2 = startline; 1283 register long line3 = startline; 1284 register int lncount; 1285 int saveln, rv, re_exec(); 1286 char *s, *re_comp(); 1287 1288 context.line = saveln = Currline; 1289 context.chrctr = startline; 1290 lncount = 0; 1291 if ((s = re_comp (buf)) != 0) 1292 error (s); 1293 while (!feof (file)) { 1294 line3 = line2; 1295 line2 = line1; 1296 line1 = Ftell (file); 1297 rdline (file); 1298 lncount++; 1299 if ((rv = re_exec (Line)) == 1) 1300 if (--n == 0) { 1301 if (lncount > 3 || (lncount > 1 && no_intty)) 1302 { 1303 pr ("\n"); 1304 if (clreol) 1305 cleareol (); 1306 pr("...skipping\n"); 1307 } 1308 if (!no_intty) { 1309 Currline -= (lncount >= 3 ? 3 : lncount); 1310 Fseek (file, line3); 1311 if (noscroll) 1312 if (clreol) { 1313 home (); 1314 cleareol (); 1315 } 1316 else 1317 doclear (); 1318 } 1319 else { 1320 kill_line (); 1321 if (noscroll) 1322 if (clreol) { 1323 home (); 1324 cleareol (); 1325 } 1326 else 1327 doclear (); 1328 pr (Line); 1329 putchar ('\n'); 1330 } 1331 break; 1332 } 1333 else if (rv == -1) 1334 error ("Regular expression botch"); 1335 } 1336 if (feof (file)) { 1337 if (!no_intty) { 1338 file->_flag &= ~_IOEOF; /* why doesn't fseek do this ??!!??! */ 1339 Currline = saveln; 1340 Fseek (file, startline); 1341 } 1342 else { 1343 pr ("\nPattern not found\n"); 1344 end_it (); 1345 } 1346 error ("Pattern not found"); 1347 } 1348 } 1349 1350 execute (filename, cmd, args) 1351 char *filename; 1352 char *cmd, *args; 1353 { 1354 int id; 1355 int n; 1356 1357 fflush (stdout); 1358 reset_tty (); 1359 for (n = 10; (id = fork ()) < 0 && n > 0; n--) 1360 sleep (5); 1361 if (id == 0) { 1362 if (!isatty(0)) { 1363 close(0); 1364 open("/dev/tty", 0); 1365 } 1366 execv (cmd, &args); 1367 write (2, "exec failed\n", 12); 1368 exit (1); 1369 } 1370 if (id > 0) { 1371 signal (SIGINT, SIG_IGN); 1372 signal (SIGQUIT, SIG_IGN); 1373 if (catch_susp) 1374 signal(SIGTSTP, SIG_DFL); 1375 while (wait(0) > 0); 1376 signal (SIGINT, end_it); 1377 signal (SIGQUIT, onquit); 1378 if (catch_susp) 1379 signal(SIGTSTP, onsusp); 1380 } else 1381 write(2, "can't fork\n", 11); 1382 set_tty (); 1383 pr ("------------------------\n"); 1384 prompt (filename); 1385 } 1386 /* 1387 ** Skip n lines in the file f 1388 */ 1389 1390 skiplns (n, f) 1391 register int n; 1392 register FILE *f; 1393 { 1394 register char c; 1395 1396 while (n > 0) { 1397 while ((c = Getc (f)) != '\n') 1398 if (c == EOF) 1399 return; 1400 n--; 1401 Currline++; 1402 } 1403 } 1404 1405 /* 1406 ** Skip nskip files in the file list (from the command line). Nskip may be 1407 ** negative. 1408 */ 1409 1410 skipf (nskip) 1411 register int nskip; 1412 { 1413 if (nskip == 0) return; 1414 if (nskip > 0) { 1415 if (fnum + nskip > nfiles - 1) 1416 nskip = nfiles - fnum - 1; 1417 } 1418 else if (within) 1419 ++fnum; 1420 fnum += nskip; 1421 if (fnum < 0) 1422 fnum = 0; 1423 pr ("\n...Skipping "); 1424 pr ("\n"); 1425 if (clreol) 1426 cleareol (); 1427 pr ("...Skipping "); 1428 pr (nskip > 0 ? "to file " : "back to file "); 1429 pr (fnames[fnum]); 1430 pr ("\n"); 1431 if (clreol) 1432 cleareol (); 1433 pr ("\n"); 1434 --fnum; 1435 } 1436 1437 /*----------------------------- Terminal I/O -------------------------------*/ 1438 1439 initterm () 1440 { 1441 char buf[TBUFSIZ]; 1442 static char clearbuf[TBUFSIZ]; 1443 char *clearptr, *padstr; 1444 int ldisc; 1445 int lmode; 1446 char *term; 1447 int tgrp; 1448 struct winsize win; 1449 1450 retry: 1451 if (!(no_tty = gtty(fileno(stdout), &otty))) { 1452 if (ioctl(fileno(stdout), TIOCLGET, &lmode) < 0) { 1453 perror("TIOCLGET"); 1454 exit(1); 1455 } 1456 docrterase = ((lmode & LCRTERA) != 0); 1457 docrtkill = ((lmode & LCRTKIL) != 0); 1458 /* 1459 * Wait until we're in the foreground before we save the 1460 * the terminal modes. 1461 */ 1462 if (ioctl(fileno(stdout), TIOCGPGRP, &tgrp) < 0) { 1463 perror("TIOCGPGRP"); 1464 exit(1); 1465 } 1466 if (tgrp != getpgrp(0)) { 1467 kill(0, SIGTTOU); 1468 goto retry; 1469 } 1470 if ((term = getenv("TERM")) == 0 || tgetent(buf, term) <= 0) { 1471 dumb++; ul_opt = 0; 1472 } 1473 else { 1474 if (ioctl(fileno(stdout), TIOCGWINSZ, &win) < 0) { 1475 Lpp = tgetnum("li"); 1476 Mcol = tgetnum("co"); 1477 } else { 1478 if ((Lpp = win.ws_row) == 0) 1479 Lpp = tgetnum("li"); 1480 if ((Mcol = win.ws_col) == 0) 1481 Mcol = tgetnum("co"); 1482 } 1483 if ((Lpp <= 0) || tgetflag("hc")) { 1484 hard++; /* Hard copy terminal */ 1485 Lpp = 24; 1486 } 1487 if (Mcol <= 0) 1488 Mcol = 80; 1489 1490 if (tailequ (fnames[0], "page") || !hard && tgetflag("ns")) 1491 noscroll++; 1492 Wrap = tgetflag("am"); 1493 bad_so = tgetflag ("xs"); 1494 clearptr = clearbuf; 1495 eraseln = tgetstr("ce",&clearptr); 1496 Clear = tgetstr("cl", &clearptr); 1497 Senter = tgetstr("so", &clearptr); 1498 Sexit = tgetstr("se", &clearptr); 1499 if ((soglitch = tgetnum("sg")) < 0) 1500 soglitch = 0; 1501 1502 /* 1503 * Set up for underlining: some terminals don't need it; 1504 * others have start/stop sequences, still others have an 1505 * underline char sequence which is assumed to move the 1506 * cursor forward one character. If underline sequence 1507 * isn't available, settle for standout sequence. 1508 */ 1509 1510 if (tgetflag("ul") || tgetflag("os")) 1511 ul_opt = 0; 1512 if ((chUL = tgetstr("uc", &clearptr)) == NULL ) 1513 chUL = ""; 1514 if (((ULenter = tgetstr("us", &clearptr)) == NULL || 1515 (ULexit = tgetstr("ue", &clearptr)) == NULL) && !*chUL) { 1516 if ((ULenter = Senter) == NULL || (ULexit = Sexit) == NULL) { 1517 ULenter = ""; 1518 ULexit = ""; 1519 } else 1520 ulglitch = soglitch; 1521 } else { 1522 if ((ulglitch = tgetnum("ug")) < 0) 1523 ulglitch = 0; 1524 } 1525 1526 if (padstr = tgetstr("pc", &clearptr)) 1527 PC = *padstr; 1528 Home = tgetstr("ho",&clearptr); 1529 if (Home == 0 || *Home == '\0') 1530 { 1531 if ((cursorm = tgetstr("cm", &clearptr)) != NULL) { 1532 strcpy(cursorhome, tgoto(cursorm, 0, 0)); 1533 Home = cursorhome; 1534 } 1535 } 1536 EodClr = tgetstr("cd", &clearptr); 1537 if ((chBS = tgetstr("bc", &clearptr)) == NULL) 1538 chBS = "\b"; 1539 1540 } 1541 if ((shell = getenv("SHELL")) == NULL) 1542 shell = "/bin/sh"; 1543 } 1544 no_intty = gtty(fileno(stdin), &otty); 1545 gtty(fileno(stderr), &otty); 1546 savetty = otty; 1547 ospeed = otty.sg_ospeed; 1548 slow_tty = ospeed < B1200; 1549 hardtabs = (otty.sg_flags & TBDELAY) != XTABS; 1550 if (!no_tty) { 1551 otty.sg_flags &= ~ECHO; 1552 if (MBIT == CBREAK || !slow_tty) 1553 otty.sg_flags |= MBIT; 1554 } 1555 } 1556 1557 readch () 1558 { 1559 char ch; 1560 extern int errno; 1561 1562 if (read (2, &ch, 1) <= 0) 1563 if (errno != EINTR) 1564 exit(0); 1565 else 1566 ch = otty.sg_kill; 1567 return (ch); 1568 } 1569 1570 static char BS = '\b'; 1571 static char *BSB = "\b \b"; 1572 static char CARAT = '^'; 1573 #define ERASEONECHAR \ 1574 if (docrterase) \ 1575 write (2, BSB, sizeof(BSB)); \ 1576 else \ 1577 write (2, &BS, sizeof(BS)); 1578 1579 ttyin (buf, nmax, pchar) 1580 char buf[]; 1581 register int nmax; 1582 char pchar; 1583 { 1584 register char *sptr; 1585 register char ch; 1586 register int slash = 0; 1587 int maxlen; 1588 char cbuf; 1589 1590 sptr = buf; 1591 maxlen = 0; 1592 while (sptr - buf < nmax) { 1593 if (promptlen > maxlen) maxlen = promptlen; 1594 ch = readch (); 1595 if (ch == '\\') { 1596 slash++; 1597 } 1598 else if ((ch == otty.sg_erase) && !slash) { 1599 if (sptr > buf) { 1600 --promptlen; 1601 ERASEONECHAR 1602 --sptr; 1603 if ((*sptr < ' ' && *sptr != '\n') || *sptr == RUBOUT) { 1604 --promptlen; 1605 ERASEONECHAR 1606 } 1607 continue; 1608 } 1609 else { 1610 if (!eraseln) promptlen = maxlen; 1611 longjmp (restore, 1); 1612 } 1613 } 1614 else if ((ch == otty.sg_kill) && !slash) { 1615 if (hard) { 1616 show (ch); 1617 putchar ('\n'); 1618 putchar (pchar); 1619 } 1620 else { 1621 putchar ('\r'); 1622 putchar (pchar); 1623 if (eraseln) 1624 erase (1); 1625 else if (docrtkill) 1626 while (promptlen-- > 1) 1627 write (2, BSB, sizeof(BSB)); 1628 promptlen = 1; 1629 } 1630 sptr = buf; 1631 fflush (stdout); 1632 continue; 1633 } 1634 if (slash && (ch == otty.sg_kill || ch == otty.sg_erase)) { 1635 ERASEONECHAR 1636 --sptr; 1637 } 1638 if (ch != '\\') 1639 slash = 0; 1640 *sptr++ = ch; 1641 if ((ch < ' ' && ch != '\n' && ch != ESC) || ch == RUBOUT) { 1642 ch += ch == RUBOUT ? -0100 : 0100; 1643 write (2, &CARAT, 1); 1644 promptlen++; 1645 } 1646 cbuf = ch; 1647 if (ch != '\n' && ch != ESC) { 1648 write (2, &cbuf, 1); 1649 promptlen++; 1650 } 1651 else 1652 break; 1653 } 1654 *--sptr = '\0'; 1655 if (!eraseln) promptlen = maxlen; 1656 if (sptr - buf >= nmax - 1) 1657 error ("Line too long"); 1658 } 1659 1660 expand (outbuf, inbuf) 1661 char *outbuf; 1662 char *inbuf; 1663 { 1664 register char *instr; 1665 register char *outstr; 1666 register char ch; 1667 char temp[200]; 1668 int changed = 0; 1669 1670 instr = inbuf; 1671 outstr = temp; 1672 while ((ch = *instr++) != '\0') 1673 switch (ch) { 1674 case '%': 1675 if (!no_intty) { 1676 strcpy (outstr, fnames[fnum]); 1677 outstr += strlen (fnames[fnum]); 1678 changed++; 1679 } 1680 else 1681 *outstr++ = ch; 1682 break; 1683 case '!': 1684 if (!shellp) 1685 error ("No previous command to substitute for"); 1686 strcpy (outstr, shell_line); 1687 outstr += strlen (shell_line); 1688 changed++; 1689 break; 1690 case '\\': 1691 if (*instr == '%' || *instr == '!') { 1692 *outstr++ = *instr++; 1693 break; 1694 } 1695 default: 1696 *outstr++ = ch; 1697 } 1698 *outstr++ = '\0'; 1699 strcpy (outbuf, temp); 1700 return (changed); 1701 } 1702 1703 show (ch) 1704 register char ch; 1705 { 1706 char cbuf; 1707 1708 if ((ch < ' ' && ch != '\n' && ch != ESC) || ch == RUBOUT) { 1709 ch += ch == RUBOUT ? -0100 : 0100; 1710 write (2, &CARAT, 1); 1711 promptlen++; 1712 } 1713 cbuf = ch; 1714 write (2, &cbuf, 1); 1715 promptlen++; 1716 } 1717 1718 error (mess) 1719 char *mess; 1720 { 1721 if (clreol) 1722 cleareol (); 1723 else 1724 kill_line (); 1725 promptlen += strlen (mess); 1726 if (Senter && Sexit) { 1727 tputs (Senter, 1, putch); 1728 pr(mess); 1729 tputs (Sexit, 1, putch); 1730 } 1731 else 1732 pr (mess); 1733 fflush(stdout); 1734 errors++; 1735 longjmp (restore, 1); 1736 } 1737 1738 1739 set_tty () 1740 { 1741 otty.sg_flags |= MBIT; 1742 otty.sg_flags &= ~ECHO; 1743 stty(fileno(stderr), &otty); 1744 } 1745 1746 reset_tty () 1747 { 1748 if (pstate) { 1749 tputs(ULexit, 1, putch); 1750 fflush(stdout); 1751 pstate = 0; 1752 } 1753 otty.sg_flags |= ECHO; 1754 otty.sg_flags &= ~MBIT; 1755 stty(fileno(stderr), &savetty); 1756 } 1757 1758 rdline (f) 1759 register FILE *f; 1760 { 1761 register char c; 1762 register char *p; 1763 1764 p = Line; 1765 while ((c = Getc (f)) != '\n' && c != EOF && p - Line < LINSIZ - 1) 1766 *p++ = c; 1767 if (c == '\n') 1768 Currline++; 1769 *p = '\0'; 1770 } 1771 1772 /* Come here when we get a suspend signal from the terminal */ 1773 1774 onsusp () 1775 { 1776 /* ignore SIGTTOU so we don't get stopped if csh grabs the tty */ 1777 signal(SIGTTOU, SIG_IGN); 1778 reset_tty (); 1779 fflush (stdout); 1780 signal(SIGTTOU, SIG_DFL); 1781 /* Send the TSTP signal to suspend our process group */ 1782 signal(SIGTSTP, SIG_DFL); 1783 sigsetmask(0); 1784 kill (0, SIGTSTP); 1785 /* Pause for station break */ 1786 1787 /* We're back */ 1788 signal (SIGTSTP, onsusp); 1789 set_tty (); 1790 if (inwait) 1791 longjmp (restore); 1792 } 1793