sys/src/cmd/sed.c

   1 /*
   2  * sed -- stream editor
   3  */
   4 #include <u.h>
   5 #include <libc.h>
   6 #include <bio.h>
   7 #include <regexp.h>
   8
   9 enum {
  10         DEPTH           = 20,           /* max nesting depth of {} */
  11         MAXCMDS         = 512,          /* max sed commands */
  12         ADDSIZE         = 10000,        /* size of add & read buffer */
  13         MAXADDS         = 20,           /* max pending adds and reads */
  14         LBSIZE          = 8192,         /* input line size */
  15         LABSIZE         = 50,           /* max number of labels */
  16         MAXSUB          = 10,           /* max number of sub reg exp */
  17         MAXFILES        = 120,          /* max output files */
  18 };
  19
  20 /*
  21  * An address is a line #, a R.E., "$", a reference to the last
  22  * R.E., or nothing.
  23  */
  24 typedef struct {
  25         enum {
  26                 A_NONE,
  27                 A_DOL,
  28                 A_LINE,
  29                 A_RE,
  30                 A_LAST,
  31         }type;
  32         union {
  33                 long    line;           /* Line # */
  34                 Reprog  *rp;            /* Compiled R.E. */
  35         };
  36 } Addr;
  37
  38 typedef struct  SEDCOM {
  39         Addr    ad1;                    /* optional start address */
  40         Addr    ad2;                    /* optional end address */
  41         union {
  42                 Reprog  *re1;           /* compiled R.E. */
  43                 Rune    *text;          /* added text or file name */
  44                 struct  SEDCOM  *lb1;   /* destination command of branch */
  45         };
  46         Rune    *rhs;                   /* Right-hand side of substitution */
  47         Biobuf* fcode;                  /* File ID for read and write */
  48         char    command;                /* command code -see below */
  49         char    gfl;                    /* 'Global' flag for substitutions */
  50         char    pfl;                    /* 'print' flag for substitutions */
  51         char    active;                 /* 1 => data between start and end */
  52         char    negfl;                  /* negation flag */
  53 } SedCom;
  54
  55 /* Command Codes for field SedCom.command */
  56 #define ACOM    01
  57 #define BCOM    020
  58 #define CCOM    02
  59 #define CDCOM   025
  60 #define CNCOM   022
  61 #define COCOM   017
  62 #define CPCOM   023
  63 #define DCOM    03
  64 #define ECOM    015
  65 #define EQCOM   013
  66 #define FCOM    016
  67 #define GCOM    027
  68 #define CGCOM   030
  69 #define HCOM    031
  70 #define CHCOM   032
  71 #define ICOM    04
  72 #define LCOM    05
  73 #define NCOM    012
  74 #define PCOM    010
  75 #define QCOM    011
  76 #define RCOM    06
  77 #define SCOM    07
  78 #define TCOM    021
  79 #define WCOM    014
  80 #define CWCOM   024
  81 #define YCOM    026
  82 #define XCOM    033
  83
  84 typedef struct label {                  /* Label symbol table */
  85         Rune    uninm[9];               /* Label name */
  86         SedCom  *chain;
  87         SedCom  *address;               /* Command associated with label */
  88 } Label;
  89
  90 typedef struct  FILE_CACHE {            /* Data file control block */
  91         struct FILE_CACHE *next;        /* Forward Link */
  92         char    *name;                  /* Name of file */
  93 } FileCache;
  94
  95 SedCom pspace[MAXCMDS];                 /* Command storage */
  96 SedCom *pend = pspace+MAXCMDS;          /* End of command storage */
  97 SedCom *rep = pspace;                   /* Current fill point */
  98
  99 int     dollars;                        /* Number of dollar addresses */
 100
 101 Reprog  *lastre;                        /* Last regular expression */
 102 Resub   subexp[MAXSUB];                 /* sub-patterns of pattern match*/
 103
 104 Rune    addspace[ADDSIZE];              /* Buffer for a, c, & i commands */
 105 Rune    *addend = addspace+ADDSIZE;
 106
 107 SedCom  *abuf[MAXADDS];                 /* Queue of pending adds & reads */
 108 SedCom  **aptr = abuf;
 109
 110 struct {                                /* Sed program input control block */
 111         enum PTYPE {                    /* Either on command line or in file */
 112                 P_ARG,
 113                 P_FILE,
 114         } type;
 115         union PCTL {                    /* Pointer to data */
 116                 Biobuf  *bp;
 117                 char    *curr;
 118         };
 119 } prog;
 120
 121 Rune    genbuf[LBSIZE+1];               /* Miscellaneous buffer */
 122
 123 FileCache       *fhead;                 /* Head of File Cache Chain */
 124 FileCache       *ftail;                 /* Tail of File Cache Chain */
 125
 126 Rune    *loc1;                          /* Start of pattern match */
 127 Rune    *loc2;                          /* End of pattern match */
 128 Rune    seof;                           /* Pattern delimiter char */
 129
 130 Rune    linebuf[LBSIZE+1];              /* Input data buffer */
 131 Rune    *lbend = linebuf+LBSIZE;        /* End of buffer */
 132 Rune    *spend = linebuf;               /* End of input data */
 133 Rune    *cp;                            /* Current scan point in linebuf */
 134
 135 Rune    holdsp[LBSIZE+1];               /* Hold buffer */
 136 Rune    *hend = holdsp+LBSIZE;          /* End of hold buffer */
 137 Rune    *hspend = holdsp;               /* End of hold data */
 138
 139 int     nflag;                          /* Command line flags */
 140 int     gflag;
 141 int     uflag;
 142
 143 int     dolflag;                        /* Set when at true EOF */
 144 int     sflag;                          /* Set when substitution done */
 145 int     jflag;                          /* Set when jump required */
 146 int     delflag;                        /* Delete current line when set */
 147
 148 long    lnum;                           /* Input line count */
 149
 150 char    fname[MAXFILES][40];            /* File name cache */
 151 Biobuf  *fcode[MAXFILES];               /* File ID cache */
 152 int     nfiles;                         /* Cache fill point */
 153
 154 Biobuf  fout;                           /* Output stream */
 155 Biobuf  stdin;                          /* Default input */
 156 Biobuf* f;                              /* Input data */
 157
 158 Label   ltab[LABSIZE];                  /* Label name symbol table */
 159 Label   *labend = ltab+LABSIZE;         /* End of label table */
 160 Label   *lab = ltab+1;                  /* Current Fill point */
 161
 162 int     depth;                          /* {} stack pointer */
 163
 164 Rune    bad;                            /* Dummy err ptr reference */
 165 Rune    *badp = &bad;
 166
 167
 168 char    CGMES[]  =      "%S command garbled: %S";
 169 char    TMMES[]  =      "Too much text: %S";
 170 char    LTL[]    =      "Label too long: %S";
 171 char    AD0MES[] =      "No addresses allowed: %S";
 172 char    AD1MES[] =      "Only one address allowed: %S";
 173
 174 void    address(Addr *);
 175 void    arout(void);
 176 int     cmp(char *, char *);
 177 int     rcmp(Rune *, Rune *);
 178 void    command(SedCom *);
 179 Reprog  *compile(void);
 180 Rune    *compsub(Rune *, Rune *);
 181 void    dechain(void);
 182 void    dosub(Rune *);
 183 void    enroll(char *);
 184 void    errexit(void);
 185 int     executable(SedCom *);
 186 void    execute(void);
 187 void    fcomp(void);
 188 long    getrune(void);
 189 Rune    *gline(Rune *);
 190 int     match(Reprog *, Rune *);
 191 void    newfile(enum PTYPE, char *);
 192 int     opendata(void);
 193 Biobuf  *open_file(char *);
 194 Rune    *place(Rune *, Rune *, Rune *);
 195 void    quit(char *, ...);
 196 int     rline(Rune *, Rune *);
 197 Label   *search(Label *);
 198 int     substitute(SedCom *);
 199 char    *text(char *);
 200 Rune    *stext(Rune *, Rune *);
 201 int     ycomp(SedCom *);
 202 char *  trans(int c);
 203 void    putline(Biobuf *bp, Rune *buf, int n);
 204
 205 void
 206 main(int argc, char **argv)
 207 {
 208         int compfl;
 209
 210         lnum = 0;
 211         Binit(&fout, 1, OWRITE);
 212         Blethal(&fout, nil);
 213         fcode[nfiles++] = &fout;
 214         compfl = 0;
 215
 216         if(argc == 1)
 217                 exits(nil);
 218         ARGBEGIN{
 219         case 'e':
 220                 if (argc <= 1)
 221                         quit("missing pattern");
 222                 newfile(P_ARG, ARGF());
 223                 fcomp();
 224                 compfl = 1;
 225                 continue;
 226         case 'f':
 227                 if(argc <= 1)
 228                         quit("no pattern-file");
 229                 newfile(P_FILE, ARGF());
 230                 fcomp();
 231                 compfl = 1;
 232                 continue;
 233         case 'g':
 234                 gflag++;
 235                 continue;
 236         case 'n':
 237                 nflag++;
 238                 continue;
 239         case 'u':
 240                 uflag++;
 241                 continue;
 242         default:
 243                 quit("Unknown flag: %c", ARGC());
 244         } ARGEND
 245
 246         if(compfl == 0) {
 247                 if (--argc < 0)
 248                         quit("missing pattern");
 249                 newfile(P_ARG, *argv++);
 250                 fcomp();
 251         }
 252
 253         if(depth)
 254                 quit("Too many {'s");
 255
 256         ltab[0].address = rep;
 257
 258         dechain();
 259
 260         if(argc <= 0)
 261                 enroll(nil);            /* Add stdin to cache */
 262         else
 263                 while(--argc >= 0)
 264                         enroll(*argv++);
 265         execute();
 266         exits(nil);
 267 }
 268
 269 void
 270 fcomp(void)
 271 {
 272         int     i;
 273         Label   *lpt;
 274         Rune    *tp;
 275         SedCom  *pt, *pt1;
 276         static Rune     *p = addspace;
 277         static SedCom   **cmpend[DEPTH];        /* stack of {} operations */
 278
 279         while (rline(linebuf, lbend) >= 0) {
 280                 cp = linebuf;
 281 comploop:
 282                 while(*cp == L' ' || *cp == L'\t')
 283                         cp++;
 284                 if(*cp == L'\0' || *cp == L'#')
 285                         continue;
 286                 if(*cp == L';') {
 287                         cp++;
 288                         goto comploop;
 289                 }
 290
 291                 address(&rep->ad1);
 292                 if (rep->ad1.type != A_NONE) {
 293                         if (rep->ad1.type == A_LAST) {
 294                                 if (!lastre)
 295                                         quit("First RE may not be null");
 296                                 rep->ad1.type = A_RE;
 297                                 rep->ad1.rp = lastre;
 298                         }
 299                         if(*cp == L',' || *cp == L';') {
 300                                 cp++;
 301                                 address(&rep->ad2);
 302                                 if (rep->ad2.type == A_LAST) {
 303                                         rep->ad2.type = A_RE;
 304                                         rep->ad2.rp = lastre;
 305                                 }
 306                         } else
 307                                 rep->ad2.type = A_NONE;
 308                 }
 309                 while(*cp == L' ' || *cp == L'\t')
 310                         cp++;
 311
 312 swit:
 313                 switch(*cp++) {
 314                 default:
 315                         quit("Unrecognized command: %S", linebuf);
 316
 317                 case '!':
 318                         rep->negfl = 1;
 319                         goto swit;
 320
 321                 case '{':
 322                         rep->command = BCOM;
 323                         rep->negfl = !rep->negfl;
 324                         cmpend[depth++] = &rep->lb1;
 325                         if(++rep >= pend)
 326                                 quit("Too many commands: %S", linebuf);
 327                         if(*cp == '\0')
 328                                 continue;
 329                         goto comploop;
 330
 331                 case '}':
 332                         if(rep->ad1.type != A_NONE)
 333                                 quit(AD0MES, linebuf);
 334                         if(--depth < 0)
 335                                 quit("Too many }'s");
 336                         *cmpend[depth] = rep;
 337                         if(*cp == 0)
 338                                 continue;
 339                         goto comploop;
 340
 341                 case '=':
 342                         rep->command = EQCOM;
 343                         if(rep->ad2.type != A_NONE)
 344                                 quit(AD1MES, linebuf);
 345                         break;
 346
 347                 case ':':
 348                         if(rep->ad1.type != A_NONE)
 349                                 quit(AD0MES, linebuf);
 350
 351                         while(*cp == L' ')
 352                                 cp++;
 353                         tp = lab->uninm;
 354                         while (*cp && *cp != L';' && *cp != L' ' &&
 355                             *cp != L'\t' && *cp != L'#') {
 356                                 *tp++ = *cp++;
 357                                 if(tp >= &lab->uninm[8])
 358                                         quit(LTL, linebuf);
 359                         }
 360                         *tp = L'\0';
 361
 362                         if (*lab->uninm == L'\0')               /* no label? */
 363                                 quit(CGMES, L":", linebuf);
 364                         if(lpt = search(lab)) {
 365                                 if(lpt->address)
 366                                         quit("Duplicate labels: %S", linebuf);
 367                         } else {
 368                                 lab->chain = 0;
 369                                 lpt = lab;
 370                                 if(++lab >= labend)
 371                                         quit("Too many labels: %S", linebuf);
 372                         }
 373                         lpt->address = rep;
 374                         if (*cp == L'#')
 375                                 continue;
 376                         rep--;                  /* reuse this slot */
 377                         break;
 378
 379                 case 'a':
 380                         rep->command = ACOM;
 381                         if(rep->ad2.type != A_NONE)
 382                                 quit(AD1MES, linebuf);
 383                         if(*cp == L'\\')
 384                                 cp++;
 385                         if(*cp++ != L'\n')
 386                                 quit(CGMES, L"a", linebuf);
 387                         rep->text = p;
 388                         p = stext(p, addend);
 389                         break;
 390                 case 'c':
 391                         rep->command = CCOM;
 392                         if(*cp == L'\\')
 393                                 cp++;
 394                         if(*cp++ != L'\n')
 395                                 quit(CGMES, L"c", linebuf);
 396                         rep->text = p;
 397                         p = stext(p, addend);
 398                         break;
 399                 case 'i':
 400                         rep->command = ICOM;
 401                         if(rep->ad2.type != A_NONE)
 402                                 quit(AD1MES, linebuf);
 403                         if(*cp == L'\\')
 404                                 cp++;
 405                         if(*cp++ != L'\n')
 406                                 quit(CGMES, L"i", linebuf);
 407                         rep->text = p;
 408                         p = stext(p, addend);
 409                         break;
 410
 411                 case 'g':
 412                         rep->command = GCOM;
 413                         break;
 414
 415                 case 'G':
 416                         rep->command = CGCOM;
 417                         break;
 418
 419                 case 'h':
 420                         rep->command = HCOM;
 421                         break;
 422
 423                 case 'H':
 424                         rep->command = CHCOM;
 425                         break;
 426
 427                 case 't':
 428                         rep->command = TCOM;
 429                         goto jtcommon;
 430
 431                 case 'b':
 432                         rep->command = BCOM;
 433 jtcommon:
 434                         while(*cp == L' ')
 435                                 cp++;
 436                         if(*cp == L'\0' || *cp == L';') {
 437                                 /* no label; jump to end */
 438                                 if(pt = ltab[0].chain) {
 439                                         while((pt1 = pt->lb1) != nil)
 440                                                 pt = pt1;
 441                                         pt->lb1 = rep;
 442                                 } else
 443                                         ltab[0].chain = rep;
 444                                 break;
 445                         }
 446
 447                         /* copy label into lab->uninm */
 448                         tp = lab->uninm;
 449                         while((*tp = *cp++) != L'\0' && *tp != L';')
 450                                 if(++tp >= &lab->uninm[8])
 451                                         quit(LTL, linebuf);
 452                         cp--;
 453                         *tp = L'\0';
 454
 455                         if (*lab->uninm == L'\0')
 456                                 /* shouldn't get here */
 457                                 quit(CGMES, L"b or t", linebuf);
 458                         if((lpt = search(lab)) != nil) {
 459                                 if(lpt->address)
 460                                         rep->lb1 = lpt->address;
 461                                 else {
 462                                         for(pt = lpt->chain; pt != nil &&
 463                                             (pt1 = pt->lb1) != nil; pt = pt1)
 464                                                 ;
 465                                         if (pt)
 466                                                 pt->lb1 = rep;
 467                                 }
 468                         } else {                        /* add new label */
 469                                 lab->chain = rep;
 470                                 lab->address = 0;
 471                                 if(++lab >= labend)
 472                                         quit("Too many labels: %S", linebuf);
 473                         }
 474                         break;
 475
 476                 case 'n':
 477                         rep->command = NCOM;
 478                         break;
 479
 480                 case 'N':
 481                         rep->command = CNCOM;
 482                         break;
 483
 484                 case 'p':
 485                         rep->command = PCOM;
 486                         break;
 487
 488                 case 'P':
 489                         rep->command = CPCOM;
 490                         break;
 491
 492                 case 'r':
 493                         rep->command = RCOM;
 494                         if(rep->ad2.type != A_NONE)
 495                                 quit(AD1MES, linebuf);
 496                         if(*cp++ != L' ')
 497                                 quit(CGMES, L"r", linebuf);
 498                         rep->text = p;
 499                         p = stext(p, addend);
 500                         break;
 501
 502                 case 'd':
 503                         rep->command = DCOM;
 504                         break;
 505
 506                 case 'D':
 507                         rep->command = CDCOM;
 508                         rep->lb1 = pspace;
 509                         break;
 510
 511                 case 'q':
 512                         rep->command = QCOM;
 513                         if(rep->ad2.type != A_NONE)
 514                                 quit(AD1MES, linebuf);
 515                         break;
 516
 517                 case 'l':
 518                         rep->command = LCOM;
 519                         break;
 520
 521                 case 's':
 522                         rep->command = SCOM;
 523                         seof = *cp++;
 524                         if ((rep->re1 = compile()) == 0) {
 525                                 if(!lastre)
 526                                         quit("First RE may not be null");
 527                                 rep->re1 = lastre;
 528                         }
 529                         rep->rhs = p;
 530                         if((p = compsub(p, addend)) == 0)
 531                                 quit(CGMES, L"s", linebuf);
 532                         if(*cp == L'g') {
 533                                 cp++;
 534                                 rep->gfl++;
 535                         } else if(gflag)
 536                                 rep->gfl++;
 537
 538                         if(*cp == L'p') {
 539                                 cp++;
 540                                 rep->pfl = 1;
 541                         }
 542
 543                         if(*cp == L'P') {
 544                                 cp++;
 545                                 rep->pfl = 2;
 546                         }
 547
 548                         if(*cp == L'w') {
 549                                 cp++;
 550                                 if(*cp++ !=  L' ')
 551                                         quit(CGMES, L"s", linebuf);
 552                                 text(fname[nfiles]);
 553                                 for(i = nfiles - 1; i >= 0; i--)
 554                                         if(cmp(fname[nfiles], fname[i]) == 0) {
 555                                                 rep->fcode = fcode[i];
 556                                                 goto done;
 557                                         }
 558                                 if(nfiles >= MAXFILES)
 559                                         quit("Too many files in w commands 1");
 560                                 rep->fcode = open_file(fname[nfiles]);
 561                         }
 562                         break;
 563
 564                 case 'w':
 565                         rep->command = WCOM;
 566                         if(*cp++ != L' ')
 567                                 quit(CGMES, L"w", linebuf);
 568                         text(fname[nfiles]);
 569                         for(i = nfiles - 1; i >= 0; i--)
 570                                 if(cmp(fname[nfiles], fname[i]) == 0) {
 571                                         rep->fcode = fcode[i];
 572                                         goto done;
 573                                 }
 574                         if(nfiles >= MAXFILES){
 575                                 fprint(2, "sed: Too many files in w commands 2 \n");
 576                                 fprint(2, "nfiles = %d; MAXF = %d\n",
 577                                         nfiles, MAXFILES);
 578                                 errexit();
 579                         }
 580                         rep->fcode = open_file(fname[nfiles]);
 581                         break;
 582
 583                 case 'x':
 584                         rep->command = XCOM;
 585                         break;
 586
 587                 case 'y':
 588                         rep->command = YCOM;
 589                         seof = *cp++;
 590                         if (ycomp(rep) == 0)
 591                                 quit(CGMES, L"y", linebuf);
 592                         break;
 593
 594                 }
 595 done:
 596                 if(++rep >= pend)
 597                         quit("Too many commands, last: %S", linebuf);
 598                 if(*cp++ != L'\0') {
 599                         if(cp[-1] == L';')
 600                                 goto comploop;
 601                         quit(CGMES, cp - 1, linebuf);
 602                 }
 603         }
 604 }
 605
 606 Biobuf *
 607 open_file(char *name)
 608 {
 609         int fd;
 610         Biobuf *bp;
 611
 612         if ((bp = malloc(sizeof(Biobuf))) == 0)
 613                 quit("Out of memory");
 614         if ((fd = open(name, OWRITE)) < 0 &&
 615             (fd = create(name, OWRITE, 0666)) < 0)
 616                 quit("Cannot create %s", name);
 617         Binit(bp, fd, OWRITE);
 618         Blethal(bp, nil);
 619         Bseek(bp, 0, 2);
 620         fcode[nfiles++] = bp;
 621         return bp;
 622 }
 623
 624 Rune *
 625 compsub(Rune *rhs, Rune *end)
 626 {
 627         Rune r;
 628
 629         while ((r = *cp++) != '\0') {
 630                 if(r == '\\') {
 631                         if (rhs < end)
 632                                 *rhs++ = Runemax;
 633                         else
 634                                 return 0;
 635                         r = *cp++;
 636                         if(r == 'n')
 637                                 r = '\n';
 638                 } else {
 639                         if(r == seof) {
 640                                 if (rhs < end)
 641                                         *rhs++ = '\0';
 642                                 else
 643                                         return 0;
 644                                 return rhs;
 645                         }
 646                 }
 647                 if (rhs < end)
 648                         *rhs++ = r;
 649                 else
 650                         return 0;
 651         }
 652         return 0;
 653 }
 654
 655 Reprog *
 656 compile(void)
 657 {
 658         Rune c;
 659         char *ep;
 660         char expbuf[512];
 661
 662         if((c = *cp++) == seof)         /* L'//' */
 663                 return 0;
 664         ep = expbuf;
 665         do {
 666                 if (c == L'\0' || c == L'\n')
 667                         quit(TMMES, linebuf);
 668                 if (c == L'\\') {
 669                         if (ep >= expbuf+sizeof(expbuf))
 670                                 quit(TMMES, linebuf);
 671                         ep += runetochar(ep, &c);
 672                         if ((c = *cp++) == L'n')
 673                                 c = L'\n';
 674                 }
 675                 if (ep >= expbuf + sizeof(expbuf))
 676                         quit(TMMES, linebuf);
 677                 ep += runetochar(ep, &c);
 678         } while ((c = *cp++) != seof);
 679         *ep = 0;
 680         return lastre = regcomp(expbuf);
 681 }
 682
 683 void
 684 regerror(char *s)
 685 {
 686         USED(s);
 687         quit(CGMES, L"r.e.-using", linebuf);
 688 }
 689
 690 int
 691 flushout(Biobufhdr *bp, void *v, long n)
 692 {
 693         int i;
 694
 695         for(i = 0; i < nfiles; i++)
 696                 Bflush(fcode[i]);
 697         return read(bp->fid, v, n);
 698 }
 699
 700 void
 701 newfile(enum PTYPE type, char *name)
 702 {
 703         if (type == P_ARG)
 704                 prog.curr = name;
 705         else {
 706                 if ((prog.bp = Bopen(name, OREAD)) == 0)
 707                         quit("Cannot open pattern-file: %s\n", name);
 708                 Blethal(prog.bp, nil);
 709                 if(uflag) Biofn(prog.bp, flushout);
 710         }
 711         prog.type = type;
 712 }
 713
 714 int
 715 rline(Rune *buf, Rune *end)
 716 {
 717         long c;
 718         Rune r;
 719
 720         while ((c = getrune()) >= 0) {
 721                 r = c;
 722                 if (r == '\\') {
 723                         if (buf <= end)
 724                                 *buf++ = r;
 725                         if ((c = getrune()) < 0)
 726                                 break;
 727                         r = c;
 728                 } else if (r == '\n') {
 729                         *buf = '\0';
 730                         return 1;
 731                 }
 732                 if (buf <= end)
 733                         *buf++ = r;
 734         }
 735         *buf = '\0';
 736         return -1;
 737 }
 738
 739 long
 740 getrune(void)
 741 {
 742         long c;
 743         Rune r;
 744         char *p;
 745
 746         if (prog.type == P_ARG) {
 747                 if ((p = prog.curr) != 0) {
 748                         if (*p) {
 749                                 prog.curr += chartorune(&r, p);
 750                                 c = r;
 751                         } else {
 752                                 c = '\n';       /* fake an end-of-line */
 753                                 prog.curr = 0;
 754                         }
 755                 } else
 756                         c = -1;
 757         } else if ((c = Bgetrune(prog.bp)) < 0)
 758                 Bterm(prog.bp);
 759         return c;
 760 }
 761
 762 void
 763 address(Addr *ap)
 764 {
 765         int c;
 766         long lno;
 767
 768         if((c = *cp++) == '$'){
 769                 ap->type = A_DOL;
 770                 dollars++;
 771         }else if(c == '/') {
 772                 seof = c;
 773                 if (ap->rp = compile())
 774                         ap->type = A_RE;
 775                 else
 776                         ap->type = A_LAST;
 777         }
 778         else if (c >= '0' && c <= '9') {
 779                 lno = c - '0';
 780                 while ((c = *cp) >= '0' && c <= '9')
 781                         lno = lno*10 + *cp++ - '0';
 782                 if(!lno)
 783                         quit("line number 0 is illegal",0);
 784                 ap->type = A_LINE;
 785                 ap->line = lno;
 786         }
 787         else {
 788                 cp--;
 789                 ap->type = A_NONE;
 790         }
 791 }
 792
 793 cmp(char *a, char *b)           /* compare characters */
 794 {
 795         while(*a == *b++)
 796                 if (*a == '\0')
 797                         return 0;
 798                 else
 799                         a++;
 800         return 1;
 801 }
 802 rcmp(Rune *a, Rune *b)          /* compare runes */
 803 {
 804         while(*a == *b++)
 805                 if (*a == '\0')
 806                         return 0;
 807                 else
 808                         a++;
 809         return 1;
 810 }
 811
 812 char *
 813 text(char *p)           /* extract character string */
 814 {
 815         Rune r;
 816
 817         while(*cp == ' ' || *cp == '\t')
 818                 cp++;
 819         while (*cp) {
 820                 if ((r = *cp++) == '\\' && (r = *cp++) == '\0')
 821                         break;
 822                 if (r == '\n')
 823                         while (*cp == ' ' || *cp == '\t')
 824                                 cp++;
 825                 p += runetochar(p, &r);
 826         }
 827         *p++ = '\0';
 828         return p;
 829 }
 830
 831 Rune *
 832 stext(Rune *p, Rune *end)               /* extract rune string */
 833 {
 834         while(*cp == L' ' || *cp == L'\t')
 835                 cp++;
 836         while (*cp) {
 837                 if (*cp == L'\\' && *++cp == L'\0')
 838                         break;
 839                 if (p >= end-1)
 840                         quit(TMMES, linebuf);
 841                 if ((*p++ = *cp++) == L'\n')
 842                         while(*cp == L' ' || *cp == L'\t')
 843                                 cp++;
 844         }
 845         *p++ = 0;
 846         return p;
 847 }
 848
 849
 850 Label *
 851 search(Label *ptr)
 852 {
 853         Label   *rp;
 854
 855         for (rp = ltab; rp < ptr; rp++)
 856                 if(rcmp(rp->uninm, ptr->uninm) == 0)
 857                         return(rp);
 858         return(0);
 859 }
 860
 861 void
 862 dechain(void)
 863 {
 864         Label   *lptr;
 865         SedCom  *rptr, *trptr;
 866
 867         for(lptr = ltab; lptr < lab; lptr++) {
 868                 if(lptr->address == 0)
 869                         quit("Undefined label: %S", lptr->uninm);
 870                 if(lptr->chain) {
 871                         rptr = lptr->chain;
 872                         while((trptr = rptr->lb1) != nil) {
 873                                 rptr->lb1 = lptr->address;
 874                                 rptr = trptr;
 875                         }
 876                         rptr->lb1 = lptr->address;
 877                 }
 878         }
 879 }
 880
 881 int
 882 ycomp(SedCom *r)
 883 {
 884         int i;
 885         Rune *rp, *sp, *tsp;
 886         Rune c, highc;
 887
 888         highc = 0;
 889         for(tsp = cp; *tsp != seof; tsp++) {
 890                 if(*tsp == L'\\')
 891                         tsp++;
 892                 if(*tsp == L'\n' || *tsp == L'\0')
 893                         return 0;
 894                 if (*tsp > highc)
 895                         highc = *tsp;
 896         }
 897         tsp++;
 898         if ((rp = r->text = (Rune *)malloc(sizeof(Rune) * (highc+2))) == nil)
 899                 quit("Out of memory");
 900         *rp++ = highc;                          /* save upper bound */
 901         for (i = 0; i <= highc; i++)
 902                 rp[i] = i;
 903         sp = cp;
 904         while((c = *sp++) != seof) {
 905                 if(c == L'\\' && *sp == L'n') {
 906                         sp++;
 907                         c = L'\n';
 908                 }
 909                 if((rp[c] = *tsp++) == L'\\' && *tsp == L'n') {
 910                         rp[c] = L'\n';
 911                         tsp++;
 912                 }
 913                 if(rp[c] == seof || rp[c] == L'\0') {
 914                         free(r->re1);
 915                         r->re1 = nil;
 916                         return 0;
 917                 }
 918         }
 919         if(*tsp != seof) {
 920                 free(r->re1);
 921                 r->re1 = nil;
 922                 return 0;
 923         }
 924         cp = tsp+1;
 925         return 1;
 926 }
 927
 928 void
 929 execute(void)
 930 {
 931         SedCom  *ipc;
 932
 933         while (spend = gline(linebuf)){
 934                 for(ipc = pspace; ipc->command; ) {
 935                         if (!executable(ipc)) {
 936                                 ipc++;
 937                                 continue;
 938                         }
 939                         command(ipc);
 940
 941                         if(delflag)
 942                                 break;
 943                         if(jflag) {
 944                                 jflag = 0;
 945                                 if((ipc = ipc->lb1) == 0)
 946                                         break;
 947                         } else
 948                                 ipc++;
 949                 }
 950                 if(!nflag && !delflag)
 951                         putline(&fout, linebuf, spend - linebuf);
 952                 if(aptr > abuf)
 953                         arout();
 954                 delflag = 0;
 955         }
 956 }
 957
 958 /* determine if a statement should be applied to an input line */
 959 int
 960 executable(SedCom *ipc)
 961 {
 962         if (ipc->active) {      /* Addr1 satisfied - accept until Addr2 */
 963                 if (ipc->active == 1)           /* Second line */
 964                         ipc->active = 2;
 965                 switch(ipc->ad2.type) {
 966                 case A_NONE:            /* No second addr; use first */
 967                         ipc->active = 0;
 968                         break;
 969                 case A_DOL:             /* Accept everything */
 970                         return !ipc->negfl;
 971                 case A_LINE:            /* Line at end of range? */
 972                         if (lnum <= ipc->ad2.line) {
 973                                 if (ipc->ad2.line == lnum)
 974                                         ipc->active = 0;
 975                                 return !ipc->negfl;
 976                         }
 977                         ipc->active = 0;        /* out of range */
 978                         return ipc->negfl;
 979                 case A_RE:              /* Check for matching R.E. */
 980                         if (match(ipc->ad2.rp, linebuf))
 981                                 ipc->active = 0;
 982                         return !ipc->negfl;
 983                 default:
 984                         quit("Internal error");
 985                 }
 986         }
 987         switch (ipc->ad1.type) {        /* Check first address */
 988         case A_NONE:                    /* Everything matches */
 989                 return !ipc->negfl;
 990         case A_DOL:                     /* Only last line */
 991                 if (dolflag)
 992                         return !ipc->negfl;
 993                 break;
 994         case A_LINE:                    /* Check line number */
 995                 if (ipc->ad1.line == lnum) {
 996                         ipc->active = 1;        /* In range */
 997                         return !ipc->negfl;
 998                 }
 999                 break;
1000         case A_RE:                      /* Check R.E. */
1001                 if (match(ipc->ad1.rp, linebuf)) {
1002                         ipc->active = 1;        /* In range */
1003                         return !ipc->negfl;
1004                 }
1005                 break;
1006         default:
1007                 quit("Internal error");
1008         }
1009         return ipc->negfl;
1010 }
1011
1012 int
1013 match(Reprog *pattern, Rune *buf)
1014 {
1015         if (!pattern)
1016                 return 0;
1017         subexp[0].rsp = buf;
1018         subexp[0].ep = 0;
1019         if (rregexec(pattern, linebuf, subexp, MAXSUB) > 0) {
1020                 loc1 = subexp[0].rsp;
1021                 loc2 = subexp[0].rep;
1022                 return 1;
1023         }
1024         loc1 = loc2 = 0;
1025         return 0;
1026 }
1027
1028 int
1029 substitute(SedCom *ipc)
1030 {
1031         int len;
1032
1033         if(!match(ipc->re1, linebuf))
1034                 return 0;
1035
1036         /*
1037          * we have at least one match.  some patterns, e.g. '$' or '^', can
1038          * produce 0-length matches, so during a global substitute we must
1039          * bump to the character after a 0-length match to keep from looping.
1040          */
1041         sflag = 1;
1042         if(ipc->gfl == 0)                       /* single substitution */
1043                 dosub(ipc->rhs);
1044         else
1045                 do{                             /* global substitution */
1046                         len = loc2 - loc1;      /* length of match */
1047                         dosub(ipc->rhs);        /* dosub moves loc2 */
1048                         if(*loc2 == 0)          /* end of string */
1049                                 break;
1050                         if(len == 0)            /* zero-length R.E. match */
1051                                 loc2++;         /* bump over 0-length match */
1052                         if(*loc2 == 0)          /* end of string */
1053                                 break;
1054                 } while(match(ipc->re1, loc2));
1055         return 1;
1056 }
1057
1058 void
1059 dosub(Rune *rhsbuf)
1060 {
1061         int c, n;
1062         Rune *lp, *sp, *rp;
1063
1064         lp = linebuf;
1065         sp = genbuf;
1066         rp = rhsbuf;
1067         while (lp < loc1)
1068                 *sp++ = *lp++;
1069         while(c = *rp++) {
1070                 if (c == '&') {
1071                         sp = place(sp, loc1, loc2);
1072                         continue;
1073                 }
1074                 if (c == Runemax && (c = *rp++) >= '1' && c < MAXSUB + '0') {
1075                         n = c-'0';
1076                         if (subexp[n].rsp && subexp[n].rep) {
1077                                 sp = place(sp, subexp[n].rsp, subexp[n].rep);
1078                                 continue;
1079                         }
1080                         else {
1081                                 quit("Invalid back reference \\%d", n);
1082                         }
1083                 }
1084                 *sp++ = c;
1085                 if (sp >= &genbuf[LBSIZE])
1086                         quit("Output line too long");
1087         }
1088         lp = loc2;
1089         loc2 = sp - genbuf + linebuf;
1090         while (*sp++ = *lp++)
1091                 if (sp >= &genbuf[LBSIZE])
1092                         quit("Output line too long");
1093         lp = linebuf;
1094         sp = genbuf;
1095         while (*lp++ = *sp++)
1096                 ;
1097         spend = lp - 1;
1098 }
1099
1100 Rune *
1101 place(Rune *sp, Rune *l1, Rune *l2)
1102 {
1103         while (l1 < l2) {
1104                 *sp++ = *l1++;
1105                 if (sp >= &genbuf[LBSIZE])
1106                         quit("Output line too long");
1107         }
1108         return sp;
1109 }
1110
1111 char *
1112 trans(int c)
1113 {
1114         static char buf[] = "\\x0000";
1115         static char hex[] = "0123456789abcdef";
1116
1117         switch(c) {
1118         case '\b':
1119                 return "\\b";
1120         case '\n':
1121                 return "\\n";
1122         case '\r':
1123                 return "\\r";
1124         case '\t':
1125                 return "\\t";
1126         case '\\':
1127                 return "\\\\";
1128         }
1129         buf[2] = hex[(c>>12)&0xF];
1130         buf[3] = hex[(c>>8)&0xF];
1131         buf[4] = hex[(c>>4)&0xF];
1132         buf[5] = hex[c&0xF];
1133         return buf;
1134 }
1135
1136 void
1137 command(SedCom *ipc)
1138 {
1139         int i, c;
1140         char *ucp;
1141         Rune *execp, *p1, *p2, *rp;
1142
1143         switch(ipc->command) {
1144         case ACOM:
1145                 *aptr++ = ipc;
1146                 if(aptr >= abuf+MAXADDS)
1147                         quit("Too many appends after line %ld", lnum);
1148                 *aptr = 0;
1149                 break;
1150         case CCOM:
1151                 delflag = 1;
1152                 if(ipc->active == 1) {
1153                         for(rp = ipc->text; *rp; rp++)
1154                                 Bputrune(&fout, *rp);
1155                         Bputc(&fout, '\n');
1156                 }
1157                 break;
1158         case DCOM:
1159                 delflag++;
1160                 break;
1161         case CDCOM:
1162                 p1 = p2 = linebuf;
1163                 while(*p1 != '\n') {
1164                         if(*p1++ == 0) {
1165                                 delflag++;
1166                                 return;
1167                         }
1168                 }
1169                 p1++;
1170                 while(*p2++ = *p1++)
1171                         ;
1172                 spend = p2 - 1;
1173                 jflag++;
1174                 break;
1175         case EQCOM:
1176                 Bprint(&fout, "%ld\n", lnum);
1177                 break;
1178         case GCOM:
1179                 p1 = linebuf;
1180                 p2 = holdsp;
1181                 while(*p1++ = *p2++)
1182                         ;
1183                 spend = p1 - 1;
1184                 break;
1185         case CGCOM:
1186                 *spend++ = '\n';
1187                 p1 = spend;
1188                 p2 = holdsp;
1189                 while(*p1++ = *p2++)
1190                         if(p1 >= lbend)
1191                                 break;
1192                 spend = p1 - 1;
1193                 break;
1194         case HCOM:
1195                 p1 = holdsp;
1196                 p2 = linebuf;
1197                 while(*p1++ = *p2++);
1198                 hspend = p1 - 1;
1199                 break;
1200         case CHCOM:
1201                 *hspend++ = '\n';
1202                 p1 = hspend;
1203                 p2 = linebuf;
1204                 while(*p1++ = *p2++)
1205                         if(p1 >= hend)
1206                                 break;
1207                 hspend = p1 - 1;
1208                 break;
1209         case ICOM:
1210                 for(rp = ipc->text; *rp; rp++)
1211                         Bputrune(&fout, *rp);
1212                 Bputc(&fout, '\n');
1213                 break;
1214         case BCOM:
1215                 jflag = 1;
1216                 break;
1217         case LCOM:
1218                 c = 0;
1219                 for (i = 0, rp = linebuf; *rp; rp++) {
1220                         c = *rp;
1221                         if(c >= 0x20 && c < 0x7F && c != '\\') {
1222                                 Bputc(&fout, c);
1223                                 if(i++ > 71) {
1224                                         Bprint(&fout, "\\\n");
1225                                         i = 0;
1226                                 }
1227                         } else {
1228                                 for (ucp = trans(*rp); *ucp; ucp++){
1229                                         c = *ucp;
1230                                         Bputc(&fout, c);
1231                                         if(i++ > 71) {
1232                                                 Bprint(&fout, "\\\n");
1233                                                 i = 0;
1234                                         }
1235                                 }
1236                         }
1237                 }
1238                 if(c == ' ')
1239                         Bprint(&fout, "\\n");
1240                 Bputc(&fout, '\n');
1241                 break;
1242         case NCOM:
1243                 if(!nflag)
1244                         putline(&fout, linebuf, spend-linebuf);
1245
1246                 if(aptr > abuf)
1247                         arout();
1248                 if((execp = gline(linebuf)) == 0) {
1249                         delflag = 1;
1250                         break;
1251                 }
1252                 spend = execp;
1253                 break;
1254         case CNCOM:
1255                 if(aptr > abuf)
1256                         arout();
1257                 *spend++ = '\n';
1258                 if((execp = gline(spend)) == 0) {
1259                         delflag = 1;
1260                         break;
1261                 }
1262                 spend = execp;
1263                 break;
1264         case PCOM:
1265                 putline(&fout, linebuf, spend-linebuf);
1266                 break;
1267         case CPCOM:
1268 cpcom:
1269                 for(rp = linebuf; *rp && *rp != '\n'; rp++)
1270                         Bputc(&fout, *rp);
1271                 Bputc(&fout, '\n');
1272                 break;
1273         case QCOM:
1274                 if(!nflag)
1275                         putline(&fout, linebuf, spend-linebuf);
1276                 if(aptr > abuf)
1277                         arout();
1278                 exits(nil);
1279         case RCOM:
1280                 *aptr++ = ipc;
1281                 if(aptr >= &abuf[MAXADDS])
1282                         quit("Too many reads after line %ld", lnum);
1283                 *aptr = 0;
1284                 break;
1285         case SCOM:
1286                 i = substitute(ipc);
1287                 if(i && ipc->pfl)
1288                         if(ipc->pfl == 1)
1289                                 putline(&fout, linebuf, spend-linebuf);
1290                         else
1291                                 goto cpcom;
1292                 if(i && ipc->fcode)
1293                         goto wcom;
1294                 break;
1295
1296         case TCOM:
1297                 if(sflag) {
1298                         sflag = 0;
1299                         jflag = 1;
1300                 }
1301                 break;
1302
1303         case WCOM:
1304 wcom:
1305                 putline(ipc->fcode,linebuf, spend - linebuf);
1306                 break;
1307         case XCOM:
1308                 p1 = linebuf;
1309                 p2 = genbuf;
1310                 while(*p2++ = *p1++)
1311                         ;
1312                 p1 = holdsp;
1313                 p2 = linebuf;
1314                 while(*p2++ = *p1++)
1315                         ;
1316                 spend = p2 - 1;
1317                 p1 = genbuf;
1318                 p2 = holdsp;
1319                 while(*p2++ = *p1++)
1320                         ;
1321                 hspend = p2 - 1;
1322                 break;
1323         case YCOM:
1324                 p1 = linebuf;
1325                 p2 = ipc->text;
1326                 for (i = *p2++; *p1; p1++)
1327                         if (*p1 <= i)
1328                                 *p1 = p2[*p1];
1329                 break;
1330         }
1331 }
1332
1333 void
1334 putline(Biobuf *bp, Rune *buf, int n)
1335 {
1336         while (n--)
1337                 Bputrune(bp, *buf++);
1338         Bputc(bp, '\n');
1339 }
1340
1341 void
1342 arout(void)
1343 {
1344         int     c;
1345         char    *s, *e;
1346         char    buf[128];
1347         Rune    *p1;
1348         Biobuf  *fi;
1349
1350         for (aptr = abuf; *aptr; aptr++) {
1351                 if((*aptr)->command == ACOM) {
1352                         for(p1 = (*aptr)->text; *p1; p1++ )
1353                                 Bputrune(&fout, *p1);
1354                         Bputc(&fout, '\n');
1355                 } else {
1356                         for(s = buf, e = buf+sizeof(buf)-UTFmax-1, p1 = (*aptr)->text; *p1 && s < e; p1++)
1357                                 s += runetochar(s, p1);
1358                         *s = '\0';
1359                         if((fi = Bopen(buf, OREAD)) == 0)
1360                                 continue;
1361                         Blethal(fi, nil);
1362                         if(uflag) Biofn(fi, flushout);
1363                         while((c = Bgetc(fi)) >= 0)
1364                                 Bputc(&fout, c);
1365                         Bterm(fi);
1366                 }
1367         }
1368         aptr = abuf;
1369         *aptr = 0;
1370 }
1371
1372 void
1373 errexit(void)
1374 {
1375         exits("error");
1376 }
1377
1378 void
1379 quit(char *fmt, ...)
1380 {
1381         char *p, *ep;
1382         char msg[256];
1383         va_list arg;
1384
1385         ep = msg + sizeof msg;
1386         p = seprint(msg, ep, "sed: ");
1387         va_start(arg, fmt);
1388         p = vseprint(p, ep, fmt, arg);
1389         va_end(arg);
1390         p = seprint(p, ep, "\n");
1391         write(2, msg, p - msg);
1392         errexit();
1393 }
1394
1395 Rune *
1396 gline(Rune *addr)
1397 {
1398         long c;
1399         Rune *p;
1400         static long peekc = 0;
1401
1402         if (f == 0 && opendata() < 0)
1403                 return 0;
1404         sflag = 0;
1405         lnum++;
1406 /*      Bflush(&fout);********* dumped 4/30/92 - bobf****/
1407         do {
1408                 p = addr;
1409                 for (c = (peekc? peekc: Bgetrune(f)); c >= 0; c = Bgetrune(f)) {
1410                         if (c == '\n') {
1411                                 if (dollars != 0 && (peekc = Bgetrune(f)) < 0 && fhead == nil)
1412                                         dolflag = 1;
1413                                 *p = '\0';
1414                                 return p;
1415                         }
1416                         if (c && p < lbend)
1417                                 *p++ = c;
1418                 }
1419                 /* return partial final line, adding implicit newline */
1420                 if(p != addr) {
1421                         *p = '\0';
1422                         peekc = -1;
1423                         if (fhead == nil)
1424                                 dolflag = 1;
1425                         return p;
1426                 }
1427                 peekc = 0;
1428                 Bterm(f);
1429         } while (opendata() > 0);               /* Switch to next stream */
1430         f = 0;
1431         return 0;
1432 }
1433
1434 /*
1435  * Data file input section - the intent is to transparently
1436  *      catenate all data input streams.
1437  */
1438 void
1439 enroll(char *filename)          /* Add a file to the input file cache */
1440 {
1441         FileCache *fp;
1442
1443         if ((fp = (FileCache *)malloc(sizeof (FileCache))) == nil)
1444                 quit("Out of memory");
1445         if (ftail == nil)
1446                 fhead = fp;
1447         else
1448                 ftail->next = fp;
1449         ftail = fp;
1450         fp->next = nil;
1451         fp->name = filename;            /* 0 => stdin */
1452 }
1453
1454 int
1455 opendata(void)
1456 {
1457         if (fhead == nil)
1458                 return -1;
1459         if (fhead->name) {
1460                 if ((f = Bopen(fhead->name, OREAD)) == nil)
1461                         quit("Can't open %s", fhead->name);
1462         } else {
1463                 Binit(&stdin, 0, OREAD);
1464                 f = &stdin;
1465         }
1466         Blethal(f, nil);
1467         if(uflag) Biofn(f, flushout);
1468         fhead = fhead->next;
1469         return 1;
1470 }