contrib/tcsh-6/sh.lex.c

   1 /* $Header: /p/tcsh/cvsroot/tcsh/sh.lex.c,v 3.81 2009/06/25 21:15:37 christos Exp $ */
   2 /*
   3  * sh.lex.c: Lexical analysis into tokens
   4  */
   5 /*-
   6  * Copyright (c) 1980, 1991 The Regents of the University of California.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33 #include "sh.h"
  34
  35 RCSID("$tcsh: sh.lex.c,v 3.81 2009/06/25 21:15:37 christos Exp $")
  36
  37 #include "ed.h"
  38
  39 #include <assert.h>
  40 /* #define DEBUG_INP */
  41 /* #define DEBUG_SEEK */
  42
  43 /*
  44  * C shell
  45  */
  46
  47 #define FLAG_G  1
  48 #define FLAG_A  2
  49 /*
  50  * These lexical routines read input and form lists of words.
  51  * There is some involved processing here, because of the complications
  52  * of input buffering, and especially because of history substitution.
  53  */
  54 static  Char            *word           (int);
  55 static  eChar            getC1          (int);
  56 static  void             getdol         (void);
  57 static  void             getexcl        (Char);
  58 static  struct Hist     *findev         (Char *, int);
  59 static  void             setexclp       (Char *);
  60 static  eChar            bgetc          (void);
  61 static  void             balloc         (int);
  62 static  void             bfree          (void);
  63 static  struct wordent  *gethent        (Char);
  64 static  int              matchs         (const Char *, const Char *);
  65 static  int              getsel         (int *, int *, int);
  66 static  struct wordent  *getsub         (struct wordent *);
  67 static  Char            *subword        (Char *, Char, int *, size_t *);
  68 static  struct wordent  *dosub          (Char, struct wordent *, int);
  69 static  ssize_t          wide_read      (int, Char *, size_t, int);
  70
  71 /*
  72  * Peekc is a peek character for getC, peekread for readc.
  73  * There is a subtlety here in many places... history routines
  74  * will read ahead and then insert stuff into the input stream.
  75  * If they push back a character then they must push it behind
  76  * the text substituted by the history substitution.  On the other
  77  * hand in several places we need 2 peek characters.  To make this
  78  * all work, the history routines read with getC, and make use both
  79  * of ungetC and unreadc.  The key observation is that the state
  80  * of getC at the call of a history reference is such that calls
  81  * to getC from the history routines will always yield calls of
  82  * readc, unless this peeking is involved.  That is to say that during
  83  * getexcl the variables lap, exclp, and exclnxt are all zero.
  84  *
  85  * Getdol invokes history substitution, hence the extra peek, peekd,
  86  * which it can ungetD to be before history substitutions.
  87  */
  88 static Char peekc = 0, peekd = 0;
  89 static Char peekread = 0;
  90
  91 /* (Tail of) current word from ! subst */
  92 static Char *exclp = NULL;
  93
  94 /* The rest of the ! subst words */
  95 static struct wordent *exclnxt = NULL;
  96
  97 /* Count of remaining words in ! subst */
  98 static int exclc = 0;
  99
 100 /* "Globp" for alias resubstitution */
 101 int aret = TCSH_F_SEEK;
 102
 103 /*
 104  * Labuf implements a general buffer for lookahead during lexical operations.
 105  * Text which is to be placed in the input stream can be stuck here.
 106  * We stick parsed ahead $ constructs during initial input,
 107  * process id's from `$$', and modified variable values (from qualifiers
 108  * during expansion in sh.dol.c) here.
 109  */
 110 struct Strbuf labuf; /* = Strbuf_INIT; */
 111
 112 /*
 113  * Lex returns to its caller not only a wordlist (as a "var" parameter)
 114  * but also whether a history substitution occurred.  This is used in
 115  * the main (process) routine to determine whether to echo, and also
 116  * when called by the alias routine to determine whether to keep the
 117  * argument list.
 118  */
 119 static int hadhist = 0;
 120
 121 /*
 122  * Avoid alias expansion recursion via \!#
 123  */
 124 int     hleft;
 125
 126 struct Strbuf histline; /* = Strbuf_INIT; last line input */
 127
 128 int    histvalid = 0;           /* is histline valid */
 129
 130 static Char getCtmp;
 131
 132 #define getC(f)         (((getCtmp = peekc) != '\0') ? (peekc = 0, (eChar)getCtmp) : getC1(f))
 133 #define ungetC(c)       peekc = (Char) c
 134 #define ungetD(c)       peekd = (Char) c
 135
 136 /* Use Htime to store timestamps picked up from history file for enthist()
 137  * if reading saved history (sg)
 138  */
 139 time_t Htime = (time_t)0;
 140 static time_t a2time_t (Char *);
 141
 142 /*
 143  * special parsing rules apply for source -h
 144  */
 145 extern int enterhist;
 146
 147 int
 148 lex(struct wordent *hp)
 149 {
 150     struct wordent *wdp;
 151     eChar    c;
 152     int     parsehtime = enterhist;
 153
 154     histvalid = 0;
 155     histline.len = 0;
 156
 157     btell(&lineloc);
 158     hp->next = hp->prev = hp;
 159     hp->word = STRNULL;
 160     hadhist = 0;
 161     do
 162         c = readc(0);
 163     while (c == ' ' || c == '\t');
 164     if (c == (eChar)HISTSUB && intty)
 165         /* ^lef^rit     from tty is short !:s^lef^rit */
 166         getexcl(c);
 167     else
 168         unreadc(c);
 169     cleanup_push(hp, lex_cleanup);
 170     wdp = hp;
 171     /*
 172      * The following loop is written so that the links needed by freelex will
 173      * be ready and rarin to go even if it is interrupted.
 174      */
 175     do {
 176         struct wordent *new;
 177
 178         new = xmalloc(sizeof(*new));
 179         new->word = NULL;
 180         new->prev = wdp;
 181         new->next = hp;
 182         wdp->next = new;
 183         hp->prev = new;
 184         wdp = new;
 185         wdp->word = word(parsehtime);
 186         parsehtime = 0;
 187     } while (wdp->word[0] != '\n');
 188     cleanup_ignore(hp);
 189     cleanup_until(hp);
 190     Strbuf_terminate(&histline);
 191     if (histline.len != 0 && histline.s[histline.len - 1] == '\n')
 192         histline.s[histline.len - 1] = '\0';
 193     histvalid = 1;
 194
 195     return (hadhist);
 196 }
 197
 198 static time_t
 199 a2time_t(Char *wordx)
 200 {
 201     /* Attempt to distinguish timestamps from other possible entries.
 202      * Format: "+NNNNNNNNNN" (10 digits, left padded with ascii '0') */
 203
 204     time_t ret;
 205     Char *s;
 206     int ct;
 207
 208     if (!wordx || *(s = wordx) != '+')
 209         return (time_t)0;
 210
 211     for (++s, ret = 0, ct = 0; *s; ++s, ++ct) {
 212         if (!isdigit((unsigned char)*s))
 213             return (time_t)0;
 214         ret = ret * 10 + (time_t)((unsigned char)*s - '0');
 215     }
 216
 217     if (ct != 10)
 218         return (time_t)0;
 219
 220     return ret;
 221 }
 222
 223 void
 224 prlex(struct wordent *sp0)
 225 {
 226     struct wordent *sp = sp0->next;
 227
 228     for (;;) {
 229         xprintf("%S", sp->word);
 230         sp = sp->next;
 231         if (sp == sp0)
 232             break;
 233         if (sp->word[0] != '\n')
 234             xputchar(' ');
 235     }
 236 }
 237
 238 void
 239 copylex(struct wordent *hp, struct wordent *fp)
 240 {
 241     struct wordent *wdp;
 242
 243     wdp = hp;
 244     fp = fp->next;
 245     do {
 246         struct wordent *new;
 247
 248         new = xmalloc(sizeof(*new));
 249         new->word = NULL;
 250         new->prev = wdp;
 251         new->next = hp;
 252         wdp->next = new;
 253         hp->prev = new;
 254         wdp = new;
 255         wdp->word = Strsave(fp->word);
 256         fp = fp->next;
 257     } while (wdp->word[0] != '\n');
 258 }
 259
 260 void
 261 freelex(struct wordent *vp)
 262 {
 263     struct wordent *fp;
 264
 265     while (vp->next != vp) {
 266         fp = vp->next;
 267         vp->next = fp->next;
 268         xfree(fp->word);
 269         xfree(fp);
 270     }
 271     vp->prev = vp;
 272 }
 273
 274 void
 275 lex_cleanup(void *xvp)
 276 {
 277     struct wordent *vp;
 278
 279     vp = xvp;
 280     freelex(vp);
 281 }
 282
 283 static Char *
 284 word(int parsehtime)
 285 {
 286     eChar c, c1;
 287     struct Strbuf wbuf = Strbuf_INIT;
 288     Char    hbuf[12];
 289     int     h;
 290     int dolflg;
 291
 292     cleanup_push(&wbuf, Strbuf_cleanup);
 293 loop:
 294     while ((c = getC(DOALL)) == ' ' || c == '\t')
 295         continue;
 296     if (cmap(c, _META | _ESC))
 297         switch (c) {
 298         case '&':
 299         case '|':
 300         case '<':
 301         case '>':
 302             Strbuf_append1(&wbuf, c);
 303             c1 = getC(DOALL);
 304             if (c1 == c)
 305                 Strbuf_append1(&wbuf, c1);
 306             else
 307                 ungetC(c1);
 308             goto ret;
 309
 310         case '#':
 311             if (intty || (enterhist && !parsehtime))
 312                 break;
 313             c = 0;
 314             h = 0;
 315             do {
 316                 c1 = c;
 317                 c = getC(0);
 318                 if (h < 11 && parsehtime)
 319                     hbuf[h++] = c;
 320             } while (c != '\n');
 321             if (parsehtime) {
 322                 hbuf[11] = '\0';
 323                 Htime = a2time_t(hbuf);
 324             }
 325             if (c1 == '\\')
 326                 goto loop;
 327             /*FALLTHROUGH*/
 328
 329         case ';':
 330         case '(':
 331         case ')':
 332         case '\n':
 333             Strbuf_append1(&wbuf, c);
 334             goto ret;
 335
 336         case '\\':
 337             c = getC(0);
 338             if (c == '\n') {
 339                 if (onelflg == 1)
 340                     onelflg = 2;
 341                 goto loop;
 342             }
 343             if (c != (eChar)HIST)
 344                 Strbuf_append1(&wbuf, '\\');
 345             c |= QUOTE;
 346         default:
 347             break;
 348         }
 349     c1 = 0;
 350     dolflg = DOALL;
 351     for (;;) {
 352         if (c1) {
 353             if (c == c1) {
 354                 c1 = 0;
 355                 dolflg = DOALL;
 356             }
 357             else if (c == '\\') {
 358                 c = getC(0);
 359 /*
 360  * PWP: this is dumb, but how all of the other shells work.  If \ quotes
 361  * a character OUTSIDE of a set of ''s, why shouldn't it quote EVERY
 362  * following character INSIDE a set of ''s.
 363  *
 364  * Actually, all I really want to be able to say is 'foo\'bar' --> foo'bar
 365  */
 366                 if (c == (eChar)HIST)
 367                     c |= QUOTE;
 368                 else {
 369                     if (bslash_quote &&
 370                         ((c == '\'') || (c == '"') ||
 371                          (c == '\\') || (c == '$'))) {
 372                         c |= QUOTE;
 373                     }
 374                     else {
 375                         if (c == '\n')
 376                             /*
 377                              * if (c1 == '`') c = ' '; else
 378                              */
 379                             c |= QUOTE;
 380                         ungetC(c);
 381                         c = '\\';
 382                     }
 383                 }
 384             }
 385             else if (c == '\n') {
 386                 seterror(ERR_UNMATCHED, c1);
 387                 ungetC(c);
 388                 break;
 389             }
 390         }
 391         else if (cmap(c, _META | _QF | _QB | _ESC)) {
 392             if (c == '\\') {
 393                 c = getC(0);
 394                 if (c == '\n') {
 395                     if (onelflg == 1)
 396                         onelflg = 2;
 397                     break;
 398                 }
 399                 if (c != (eChar)HIST)
 400                     Strbuf_append1(&wbuf, '\\');
 401                 c |= QUOTE;
 402             }
 403             else if (cmap(c, _QF | _QB)) {      /* '"` */
 404                 c1 = c;
 405                 dolflg = c == '"' ? DOALL : DOEXCL;
 406             }
 407             else if (c != '#' || (!intty && !enterhist)) {
 408                 ungetC(c);
 409                 break;
 410             }
 411         }
 412         Strbuf_append1(&wbuf, c);
 413         c = getC(dolflg);
 414     }
 415 ret:
 416     cleanup_ignore(&wbuf);
 417     cleanup_until(&wbuf);
 418     return Strbuf_finish(&wbuf);
 419 }
 420
 421 static eChar
 422 getC1(int flag)
 423 {
 424     eChar c;
 425
 426     for (;;) {
 427         if ((c = peekc) != 0) {
 428             peekc = 0;
 429             return (c);
 430         }
 431         if (lap < labuf.len) {
 432             c = labuf.s[lap++];
 433             if (cmap(c, _META | _QF | _QB))
 434                 c |= QUOTE;
 435             return (c);
 436         }
 437         if ((c = peekd) != 0) {
 438             peekd = 0;
 439             return (c);
 440         }
 441         if (exclp) {
 442             if ((c = *exclp++) != 0)
 443                 return (c);
 444             if (exclnxt && --exclc >= 0) {
 445                 exclnxt = exclnxt->next;
 446                 setexclp(exclnxt->word);
 447                 return (' ');
 448             }
 449             exclp = 0;
 450             exclnxt = 0;
 451             /* this will throw away the dummy history entries */
 452             savehist(NULL, 0);
 453
 454         }
 455         if (exclnxt) {
 456             exclnxt = exclnxt->next;
 457             if (--exclc < 0)
 458                 exclnxt = 0;
 459             else
 460                 setexclp(exclnxt->word);
 461             continue;
 462         }
 463         c = readc(0);
 464         if (c == '$' && (flag & DODOL)) {
 465             getdol();
 466             continue;
 467         }
 468         if (c == (eChar)HIST && (flag & DOEXCL)) {
 469             getexcl(0);
 470             continue;
 471         }
 472         break;
 473     }
 474     return (c);
 475 }
 476
 477 static void
 478 getdol(void)
 479 {
 480     struct Strbuf name = Strbuf_INIT;
 481     eChar c;
 482     eChar   sc;
 483     int    special = 0;
 484
 485     c = sc = getC(DOEXCL);
 486     if (any("\t \n", c)) {
 487         ungetD(c);
 488         ungetC('$' | QUOTE);
 489         return;
 490     }
 491     cleanup_push(&name, Strbuf_cleanup);
 492     Strbuf_append1(&name, '$');
 493     if (c == '{')
 494         Strbuf_append1(&name, c), c = getC(DOEXCL);
 495     if (c == '#' || c == '?' || c == '%')
 496         special++, Strbuf_append1(&name, c), c = getC(DOEXCL);
 497     Strbuf_append1(&name, c);
 498     switch (c) {
 499
 500     case '<':
 501     case '$':
 502     case '!':
 503         if (special)
 504             seterror(ERR_SPDOLLT);
 505         goto end;
 506
 507     case '\n':
 508         ungetD(c);
 509         name.len--;
 510         if (!special)
 511             seterror(ERR_NEWLINE);
 512         goto end;
 513
 514     case '*':
 515         if (special)
 516             seterror(ERR_SPSTAR);
 517         goto end;
 518
 519     default:
 520         if (Isdigit(c)) {
 521 #ifdef notdef
 522             /* let $?0 pass for now */
 523             if (special) {
 524                 seterror(ERR_DIGIT);
 525                 goto end;
 526             }
 527 #endif
 528             while ((c = getC(DOEXCL)) != 0) {
 529                 if (!Isdigit(c))
 530                     break;
 531                 Strbuf_append1(&name, c);
 532             }
 533         }
 534         else if (letter(c)) {
 535             while ((c = getC(DOEXCL)) != 0) {
 536                 /* Bugfix for ${v123x} from Chris Torek, DAS DEC-90. */
 537                 if (!letter(c) && !Isdigit(c))
 538                     break;
 539                 Strbuf_append1(&name, c);
 540             }
 541         }
 542         else {
 543             if (!special)
 544                 seterror(ERR_VARILL);
 545             else {
 546                 ungetD(c);
 547                 name.len--;
 548             }
 549             goto end;
 550         }
 551         break;
 552     }
 553     if (c == '[') {
 554         Strbuf_append1(&name, c);
 555         do {
 556             /*
 557              * Michael Greim: Allow $ expansion to take place in selector
 558              * expressions. (limits the number of characters returned)
 559              */
 560             c = getC(DOEXCL | DODOL);
 561             if (c == '\n') {
 562                 ungetD(c);
 563                 name.len--;
 564                 seterror(ERR_NLINDEX);
 565                 goto end;
 566             }
 567             Strbuf_append1(&name, c);
 568         } while (c != ']');
 569         c = getC(DOEXCL);
 570     }
 571     if (c == ':') {
 572         /*
 573          * if the :g modifier is followed by a newline, then error right away!
 574          * -strike
 575          */
 576
 577         int     gmodflag = 0, amodflag = 0;
 578
 579         do {
 580             Strbuf_append1(&name, c), c = getC(DOEXCL);
 581             if (c == 'g' || c == 'a') {
 582                 if (c == 'g')
 583                     gmodflag++;
 584                 else
 585                     amodflag++;
 586                 Strbuf_append1(&name, c); c = getC(DOEXCL);
 587             }
 588             if ((c == 'g' && !gmodflag) || (c == 'a' && !amodflag)) {
 589                 if (c == 'g')
 590                     gmodflag++;
 591                 else
 592                     amodflag++;
 593                 Strbuf_append1(&name, c); c = getC(DOEXCL);
 594             }
 595             Strbuf_append1(&name, c);
 596             /* scan s// [eichin:19910926.0512EST] */
 597             if (c == 's') {
 598                 int delimcnt = 2;
 599                 eChar delim = getC(0);
 600
 601                 Strbuf_append1(&name, delim);
 602                 if (!delim || letter(delim)
 603                     || Isdigit(delim) || any(" \t\n", delim)) {
 604                     seterror(ERR_BADSUBST);
 605                     break;
 606                 }
 607                 while ((c = getC(0)) != CHAR_ERR) {
 608                     Strbuf_append1(&name, c);
 609                     if(c == delim) delimcnt--;
 610                     if(!delimcnt) break;
 611                 }
 612                 if(delimcnt) {
 613                     seterror(ERR_BADSUBST);
 614                     break;
 615                 }
 616                 c = 's';
 617             }
 618             if (!any("htrqxesul", c)) {
 619                 if ((amodflag || gmodflag) && c == '\n')
 620                     stderror(ERR_VARSYN);       /* strike */
 621                 seterror(ERR_BADMOD, c);
 622                 goto end;
 623             }
 624         }
 625         while ((c = getC(DOEXCL)) == ':');
 626         ungetD(c);
 627     }
 628     else
 629         ungetD(c);
 630     if (sc == '{') {
 631         c = getC(DOEXCL);
 632         if (c != '}') {
 633             ungetD(c);
 634             seterror(ERR_MISSING, '}');
 635             goto end;
 636         }
 637         Strbuf_append1(&name, c);
 638     }
 639  end:
 640     cleanup_ignore(&name);
 641     cleanup_until(&name);
 642     addla(Strbuf_finish(&name));
 643 }
 644
 645 /* xfree()'s its argument */
 646 void
 647 addla(Char *cp)
 648 {
 649     static struct Strbuf buf; /* = Strbuf_INIT; */
 650
 651     buf.len = 0;
 652     Strbuf_appendn(&buf, labuf.s + lap, labuf.len - lap);
 653     labuf.len = 0;
 654     Strbuf_append(&labuf, cp);
 655     Strbuf_terminate(&labuf);
 656     Strbuf_appendn(&labuf, buf.s, buf.len);
 657     xfree(cp);
 658     lap = 0;
 659 }
 660
 661 /* left-hand side of last :s or search string of last ?event? */
 662 static struct Strbuf lhsb; /* = Strbuf_INIT; */
 663 static struct Strbuf slhs; /* = Strbuf_INIT; left-hand side of last :s */
 664 static struct Strbuf rhsb; /* = Strbuf_INIT; right-hand side of last :s */
 665 static int quesarg;
 666
 667 static void
 668 getexcl(Char sc)
 669 {
 670     struct wordent *hp, *ip;
 671     int     left, right, dol;
 672     eChar c;
 673
 674     if (sc == 0) {
 675         sc = getC(0);
 676         if (sc != '{') {
 677             ungetC(sc);
 678             sc = 0;
 679         }
 680     }
 681     quesarg = -1;
 682
 683     lastev = eventno;
 684     hp = gethent(sc);
 685     if (hp == 0)
 686         return;
 687     hadhist = 1;
 688     dol = 0;
 689     if (hp == alhistp)
 690         for (ip = hp->next->next; ip != alhistt; ip = ip->next)
 691             dol++;
 692     else
 693         for (ip = hp->next->next; ip != hp->prev; ip = ip->next)
 694             dol++;
 695     left = 0, right = dol;
 696     if (sc == HISTSUB) {
 697         ungetC('s'), unreadc(HISTSUB), c = ':';
 698         goto subst;
 699     }
 700     c = getC(0);
 701     if (!any(":^$*-%", c))
 702         goto subst;
 703     left = right = -1;
 704     if (c == ':') {
 705         c = getC(0);
 706         unreadc(c);
 707         if (letter(c) || c == '&') {
 708             c = ':';
 709             left = 0, right = dol;
 710             goto subst;
 711         }
 712     }
 713     else
 714         ungetC(c);
 715     if (!getsel(&left, &right, dol))
 716         return;
 717     c = getC(0);
 718     if (c == '*')
 719         ungetC(c), c = '-';
 720     if (c == '-') {
 721         if (!getsel(&left, &right, dol))
 722             return;
 723         c = getC(0);
 724     }
 725 subst:
 726     exclc = right - left + 1;
 727     while (--left >= 0)
 728         hp = hp->next;
 729     if (sc == HISTSUB || c == ':') {
 730         do {
 731             hp = getsub(hp);
 732             c = getC(0);
 733         } while (c == ':');
 734     }
 735     unreadc(c);
 736     if (sc == '{') {
 737         c = getC(0);
 738         if (c != '}')
 739             seterror(ERR_BADBANG);
 740     }
 741     exclnxt = hp;
 742 }
 743
 744 static struct wordent *
 745 getsub(struct wordent *en)
 746 {
 747     eChar   delim;
 748     eChar   c;
 749     eChar   sc;
 750     int global;
 751
 752     do {
 753         exclnxt = 0;
 754         global = 0;
 755         sc = c = getC(0);
 756         while (c == 'g' || c == 'a') {
 757             global |= (c == 'g') ? FLAG_G : FLAG_A;
 758             sc = c = getC(0);
 759         }
 760
 761         switch (c) {
 762         case 'p':
 763             justpr++;
 764             return (en);
 765
 766         case 'x':
 767         case 'q':
 768             global |= FLAG_G;
 769             /*FALLTHROUGH*/
 770
 771         case 'h':
 772         case 'r':
 773         case 't':
 774         case 'e':
 775         case 'u':
 776         case 'l':
 777             break;
 778
 779         case '&':
 780             if (slhs.len == 0) {
 781                 seterror(ERR_NOSUBST);
 782                 return (en);
 783             }
 784             lhsb.len = 0;
 785             Strbuf_append(&lhsb, slhs.s);
 786             Strbuf_terminate(&lhsb);
 787             break;
 788
 789 #ifdef notdef
 790         case '~':
 791             if (lhsb.len == 0)
 792                 goto badlhs;
 793             break;
 794 #endif
 795
 796         case 's':
 797             delim = getC(0);
 798             if (letter(delim) || Isdigit(delim) || any(" \t\n", delim)) {
 799                 unreadc(delim);
 800                 lhsb.len = 0;
 801                 seterror(ERR_BADSUBST);
 802                 return (en);
 803             }
 804             Strbuf_terminate(&lhsb);
 805             lhsb.len = 0;
 806             for (;;) {
 807                 c = getC(0);
 808                 if (c == '\n') {
 809                     unreadc(c);
 810                     break;
 811                 }
 812                 if (c == delim)
 813                     break;
 814                 if (c == '\\') {
 815                     c = getC(0);
 816                     if (c != delim && c != '\\')
 817                         Strbuf_append1(&lhsb, '\\');
 818                 }
 819                 Strbuf_append1(&lhsb, c);
 820             }
 821             if (lhsb.len != 0)
 822                 Strbuf_terminate(&lhsb);
 823             else if (lhsb.s[0] == 0) {
 824                 seterror(ERR_LHS);
 825                 return (en);
 826             } else
 827                 lhsb.len = Strlen(lhsb.s); /* lhsb.s wasn't changed */
 828             rhsb.len = 0;
 829             for (;;) {
 830                 c = getC(0);
 831                 if (c == '\n') {
 832                     unreadc(c);
 833                     break;
 834                 }
 835                 if (c == delim)
 836                     break;
 837                 if (c == '\\') {
 838                     c = getC(0);
 839                     if (c != delim /* && c != '~' */ )
 840                         Strbuf_append1(&rhsb,  '\\');
 841                 }
 842                 Strbuf_append1(&rhsb, c);
 843             }
 844             Strbuf_terminate(&rhsb);
 845             break;
 846
 847         default:
 848             if (c == '\n')
 849                 unreadc(c);
 850             seterror(ERR_BADBANGMOD, (int)c);
 851             return (en);
 852         }
 853         slhs.len = 0;
 854         if (lhsb.s != NULL && lhsb.len != 0)
 855             Strbuf_append(&slhs, lhsb.s);
 856         Strbuf_terminate(&slhs);
 857         if (exclc)
 858             en = dosub(sc, en, global);
 859     }
 860     while ((c = getC(0)) == ':');
 861     unreadc(c);
 862     return (en);
 863 }
 864
 865 /*
 866  *
 867  * From Beto Appleton (beto@aixwiz.austin.ibm.com)
 868  *
 869  * when using history substitution, and the variable
 870  * 'history' is set to a value higher than 1000,
 871  * the shell might either freeze (hang) or core-dump.
 872  * We raise the limit to 50000000
 873  */
 874
 875 #define HIST_PURGE -50000000
 876 static struct wordent *
 877 dosub(Char sc, struct wordent *en, int global)
 878 {
 879     struct wordent lexi;
 880     int    didsub = 0, didone = 0;
 881     struct wordent *hp = &lexi;
 882     struct wordent *wdp;
 883     int i = exclc;
 884     struct Hist *hst;
 885
 886     wdp = hp;
 887     while (--i >= 0) {
 888         struct wordent *new = xcalloc(1, sizeof *wdp);
 889
 890         new->word = 0;
 891         new->prev = wdp;
 892         new->next = hp;
 893         wdp->next = new;
 894         wdp = new;
 895         en = en->next;
 896         if (en->word) {
 897             Char *tword, *otword;
 898
 899             if ((global & FLAG_G) || didsub == 0) {
 900                 size_t pos;
 901
 902                 pos = 0;
 903                 tword = subword(en->word, sc, &didone, &pos);
 904                 if (didone)
 905                     didsub = 1;
 906                 if (global & FLAG_A) {
 907                     while (didone && tword != STRNULL) {
 908                         otword = tword;
 909                         tword = subword(otword, sc, &didone, &pos);
 910                         if (Strcmp(tword, otword) == 0) {
 911                             xfree(otword);
 912                             break;
 913                         }
 914                         else
 915                             xfree(otword);
 916                     }
 917                 }
 918             }
 919             else
 920                 tword = Strsave(en->word);
 921             wdp->word = tword;
 922         }
 923     }
 924     if (didsub == 0)
 925         seterror(ERR_MODFAIL);
 926     hp->prev = wdp;
 927     /*
 928      * ANSI mode HP/UX compiler chokes on
 929      * return &enthist(HIST_PURGE, &lexi, 0)->Hlex;
 930      */
 931     hst = enthist(HIST_PURGE, &lexi, 0, 0);
 932     return &(hst->Hlex);
 933 }
 934
 935 /* Return a newly allocated result of one modification of CP using the
 936    operation TYPE.  Set ADID to 1 if a modification was performed.
 937    If TYPE == 's', perform substitutions only from *START_POS on and set
 938    *START_POS to the position of next substitution attempt. */
 939 static Char *
 940 subword(Char *cp, Char type, int *adid, size_t *start_pos)
 941 {
 942     Char *wp;
 943     const Char *mp, *np;
 944
 945     switch (type) {
 946
 947     case 'r':
 948     case 'e':
 949     case 'h':
 950     case 't':
 951     case 'q':
 952     case 'x':
 953     case 'u':
 954     case 'l':
 955         wp = domod(cp, type);
 956         if (wp == 0) {
 957             *adid = 0;
 958             return (Strsave(cp));
 959         }
 960         *adid = 1;
 961         return (wp);
 962
 963     default:
 964         for (mp = cp + *start_pos; *mp; mp++) {
 965             if (matchs(mp, lhsb.s)) {
 966                 struct Strbuf wbuf = Strbuf_INIT;
 967
 968                 Strbuf_appendn(&wbuf, cp, mp - cp);
 969                 for (np = rhsb.s; *np; np++)
 970                     switch (*np) {
 971
 972                     case '\\':
 973                         if (np[1] == '&')
 974                             np++;
 975                         /* fall into ... */
 976
 977                     default:
 978                         Strbuf_append1(&wbuf, *np);
 979                         continue;
 980
 981                     case '&':
 982                         Strbuf_append(&wbuf, lhsb.s);
 983                         continue;
 984                     }
 985                 *start_pos = wbuf.len;
 986                 Strbuf_append(&wbuf, mp + lhsb.len);
 987                 *adid = 1;
 988                 return Strbuf_finish(&wbuf);
 989             }
 990         }
 991         *adid = 0;
 992         return (Strsave(cp));
 993     }
 994 }
 995
 996 Char   *
 997 domod(Char *cp, Char type)
 998 {
 999     Char *wp, *xp;
1000     int c;
1001
1002     switch (type) {
1003
1004     case 'x':
1005     case 'q':
1006         wp = Strsave(cp);
1007         for (xp = wp; (c = *xp) != 0; xp++)
1008             if ((c != ' ' && c != '\t') || type == 'q')
1009                 *xp |= QUOTE;
1010         return (wp);
1011
1012     case 'l':
1013         wp = NLSChangeCase(cp, 1);
1014         return wp ? wp : Strsave(cp);
1015
1016     case 'u':
1017         wp = NLSChangeCase(cp, 0);
1018         return wp ? wp : Strsave(cp);
1019
1020     case 'h':
1021     case 't':
1022         if (!any(short2str(cp), '/'))
1023             return (type == 't' ? Strsave(cp) : 0);
1024         wp = Strrchr(cp, '/');
1025         if (type == 'h')
1026             xp = Strnsave(cp, wp - cp);
1027         else
1028             xp = Strsave(wp + 1);
1029         return (xp);
1030
1031     case 'e':
1032     case 'r':
1033         wp = Strend(cp);
1034         for (wp--; wp >= cp && *wp != '/'; wp--)
1035             if (*wp == '.') {
1036                 if (type == 'e')
1037                     xp = Strsave(wp + 1);
1038                 else
1039                     xp = Strnsave(cp, wp - cp);
1040                 return (xp);
1041             }
1042         return (Strsave(type == 'e' ? STRNULL : cp));
1043     default:
1044         break;
1045     }
1046     return (0);
1047 }
1048
1049 static int
1050 matchs(const Char *str, const Char *pat)
1051 {
1052     while (*str && *pat && *str == *pat)
1053         str++, pat++;
1054     return (*pat == 0);
1055 }
1056
1057 static int
1058 getsel(int *al, int *ar, int dol)
1059 {
1060     eChar c = getC(0);
1061     int i;
1062     int    first = *al < 0;
1063
1064     switch (c) {
1065
1066     case '%':
1067         if (quesarg == -1) {
1068             seterror(ERR_BADBANGARG);
1069             return (0);
1070         }
1071         if (*al < 0)
1072             *al = quesarg;
1073         *ar = quesarg;
1074         break;
1075
1076     case '-':
1077         if (*al < 0) {
1078             *al = 0;
1079             *ar = dol - 1;
1080             unreadc(c);
1081         }
1082         return (1);
1083
1084     case '^':
1085         if (*al < 0)
1086             *al = 1;
1087         *ar = 1;
1088         break;
1089
1090     case '$':
1091         if (*al < 0)
1092             *al = dol;
1093         *ar = dol;
1094         break;
1095
1096     case '*':
1097         if (*al < 0)
1098             *al = 1;
1099         *ar = dol;
1100         if (*ar < *al) {
1101             *ar = 0;
1102             *al = 1;
1103             return (1);
1104         }
1105         break;
1106
1107     default:
1108         if (Isdigit(c)) {
1109             i = 0;
1110             while (Isdigit(c)) {
1111                 i = i * 10 + c - '0';
1112                 c = getC(0);
1113             }
1114             if (i < 0)
1115                 i = dol + 1;
1116             if (*al < 0)
1117                 *al = i;
1118             *ar = i;
1119         }
1120         else if (*al < 0)
1121             *al = 0, *ar = dol;
1122         else
1123             *ar = dol - 1;
1124         unreadc(c);
1125         break;
1126     }
1127     if (first) {
1128         c = getC(0);
1129         unreadc(c);
1130         if (any("-$*", c))
1131             return (1);
1132     }
1133     if (*al > *ar || *ar > dol) {
1134         seterror(ERR_BADBANGARG);
1135         return (0);
1136     }
1137     return (1);
1138
1139 }
1140
1141 static struct wordent *
1142 gethent(Char sc)
1143 {
1144     struct Hist *hp;
1145     Char *np;
1146     eChar c;
1147     int     event;
1148     int    back = 0;
1149
1150     c = sc == HISTSUB ? (eChar)HIST : getC(0);
1151     if (c == (eChar)HIST) {
1152         if (alhistp)
1153             return (alhistp);
1154         event = eventno;
1155     }
1156     else
1157         switch (c) {
1158
1159         case ':':
1160         case '^':
1161         case '$':
1162         case '*':
1163         case '%':
1164             ungetC(c);
1165             if (lastev == eventno && alhistp)
1166                 return (alhistp);
1167             event = lastev;
1168             break;
1169
1170         case '#':               /* !# is command being typed in (mrh) */
1171             if (--hleft == 0) {
1172                 seterror(ERR_HISTLOOP);
1173                 return (0);
1174             }
1175             else
1176                 return (&paraml);
1177             /* NOTREACHED */
1178
1179         case '-':
1180             back = 1;
1181             c = getC(0);
1182             /* FALLSTHROUGH */
1183
1184         default:
1185             if (any("(=~", c)) {
1186                 unreadc(c);
1187                 ungetC(HIST);
1188                 return (0);
1189             }
1190             Strbuf_terminate(&lhsb);
1191             lhsb.len = 0;
1192             event = 0;
1193             while (!cmap(c, _ESC | _META | _QF | _QB) && !any("^*-%${}:#", c)) {
1194                 if (event != -1 && Isdigit(c))
1195                     event = event * 10 + c - '0';
1196                 else
1197                     event = -1;
1198                 Strbuf_append1(&lhsb, c);
1199                 c = getC(0);
1200             }
1201             unreadc(c);
1202             if (lhsb.len == 0) {
1203                 lhsb.len = Strlen(lhsb.s); /* lhsb.s wasn't changed */
1204                 ungetC(HIST);
1205                 return (0);
1206             }
1207             Strbuf_terminate(&lhsb);
1208             if (event != -1) {
1209                 /*
1210                  * History had only digits
1211                  */
1212                 if (back)
1213                     event = eventno + (alhistp == 0) - event;
1214                 break;
1215             }
1216             if (back) {
1217                 Strbuf_append1(&lhsb, '\0'); /* Allocate space */
1218                 Strbuf_terminate(&lhsb);
1219                 memmove(lhsb.s + 1, lhsb.s, (lhsb.len - 1) * sizeof (*lhsb.s));
1220                 lhsb.s[0] = '-';
1221             }
1222             hp = findev(lhsb.s, 0);
1223             if (hp)
1224                 lastev = hp->Hnum;
1225             return (&hp->Hlex);
1226
1227         case '?':
1228             Strbuf_terminate(&lhsb);
1229             lhsb.len = 0;
1230             for (;;) {
1231                 c = getC(0);
1232                 if (c == '\n') {
1233                     unreadc(c);
1234                     break;
1235                 }
1236                 if (c == '?')
1237                     break;
1238                 Strbuf_append1(&lhsb, c);
1239             }
1240             if (lhsb.len == 0) {
1241                 lhsb.len = Strlen(lhsb.s); /* lhsb.s wasn't changed */
1242                 if (lhsb.len == 0) {
1243                     seterror(ERR_NOSEARCH);
1244                     return (0);
1245                 }
1246             }
1247             else
1248                 Strbuf_terminate(&lhsb);
1249             hp = findev(lhsb.s, 1);
1250             if (hp)
1251                 lastev = hp->Hnum;
1252             return (&hp->Hlex);
1253         }
1254
1255     for (hp = Histlist.Hnext; hp; hp = hp->Hnext)
1256         if (hp->Hnum == event) {
1257             hp->Href = eventno;
1258             lastev = hp->Hnum;
1259             return (&hp->Hlex);
1260         }
1261     np = putn(event);
1262     seterror(ERR_NOEVENT, short2str(np));
1263     xfree(np);
1264     return (0);
1265 }
1266
1267 static struct Hist *
1268 findev(Char *cp, int anyarg)
1269 {
1270     struct Hist *hp;
1271
1272     for (hp = Histlist.Hnext; hp; hp = hp->Hnext) {
1273         Char   *dp;
1274         Char *p, *q;
1275         struct wordent *lp = hp->Hlex.next;
1276         int     argno = 0;
1277
1278         /*
1279          * The entries added by alias substitution don't have a newline but do
1280          * have a negative event number. Savehist() trims off these entries,
1281          * but it happens before alias expansion, too early to delete those
1282          * from the previous command.
1283          */
1284         if (hp->Hnum < 0)
1285             continue;
1286         if (lp->word[0] == '\n')
1287             continue;
1288         if (!anyarg) {
1289             p = cp;
1290             q = lp->word;
1291             do
1292                 if (!*p)
1293                     return (hp);
1294             while (*p++ == *q++);
1295             continue;
1296         }
1297         do {
1298             for (dp = lp->word; *dp; dp++) {
1299                 p = cp;
1300                 q = dp;
1301                 do
1302                     if (!*p) {
1303                         quesarg = argno;
1304                         return (hp);
1305                     }
1306                 while (*p++ == *q++);
1307             }
1308             lp = lp->next;
1309             argno++;
1310         } while (lp->word[0] != '\n');
1311     }
1312     seterror(ERR_NOEVENT, short2str(cp));
1313     return (0);
1314 }
1315
1316
1317 static void
1318 setexclp(Char *cp)
1319 {
1320     if (cp && cp[0] == '\n')
1321         return;
1322     exclp = cp;
1323 }
1324
1325 void
1326 unreadc(Char c)
1327 {
1328     peekread = (Char) c;
1329 }
1330
1331 eChar
1332 readc(int wanteof)
1333 {
1334     eChar c;
1335     static  int sincereal;      /* Number of real EOFs we've seen */
1336
1337 #ifdef DEBUG_INP
1338     xprintf("readc\n");
1339 #endif
1340     if ((c = peekread) != 0) {
1341         peekread = 0;
1342         return (c);
1343     }
1344
1345 top:
1346     aret = TCSH_F_SEEK;
1347     if (alvecp) {
1348         arun = 1;
1349 #ifdef DEBUG_INP
1350         xprintf("alvecp %c\n", *alvecp & 0xff);
1351 #endif
1352         aret = TCSH_A_SEEK;
1353         if ((c = *alvecp++) != 0)
1354             return (c);
1355         if (alvec && *alvec) {
1356                 alvecp = *alvec++;
1357                 return (' ');
1358         }
1359         else {
1360             alvecp = NULL;
1361             aret = TCSH_F_SEEK;
1362             return('\n');
1363         }
1364     }
1365     if (alvec) {
1366         arun = 1;
1367         if ((alvecp = *alvec) != 0) {
1368             alvec++;
1369             goto top;
1370         }
1371         /* Infinite source! */
1372         return ('\n');
1373     }
1374     arun = 0;
1375     if (evalp) {
1376         aret = TCSH_E_SEEK;
1377         if ((c = *evalp++) != 0)
1378             return (c);
1379         if (evalvec && *evalvec) {
1380             evalp = *evalvec++;
1381             return (' ');
1382         }
1383         aret = TCSH_F_SEEK;
1384         evalp = 0;
1385     }
1386     if (evalvec) {
1387         if (evalvec == INVPPTR) {
1388             doneinp = 1;
1389             reset();
1390         }
1391         if ((evalp = *evalvec) != 0) {
1392             evalvec++;
1393             goto top;
1394         }
1395         evalvec = INVPPTR;
1396         return ('\n');
1397     }
1398     do {
1399         if (arginp == INVPTR || onelflg == 1) {
1400             if (wanteof)
1401                 return CHAR_ERR;
1402             exitstat();
1403         }
1404         if (arginp) {
1405             if ((c = *arginp++) == 0) {
1406                 arginp = INVPTR;
1407                 return ('\n');
1408             }
1409             return (c);
1410         }
1411 #ifdef BSDJOBS
1412 reread:
1413 #endif /* BSDJOBS */
1414         c = bgetc();
1415         if (c == CHAR_ERR) {
1416 #ifndef WINNT_NATIVE
1417 # ifndef POSIX
1418 #  ifdef TERMIO
1419             struct termio tty;
1420 #  else /* SGTTYB */
1421             struct sgttyb tty;
1422 #  endif /* TERMIO */
1423 # else /* POSIX */
1424             struct termios tty;
1425 # endif /* POSIX */
1426 #endif /* !WINNT_NATIVE */
1427             if (wanteof)
1428                 return CHAR_ERR;
1429             /* was isatty but raw with ignoreeof yields problems */
1430 #ifndef WINNT_NATIVE
1431 # ifndef POSIX
1432 #  ifdef TERMIO
1433             if (ioctl(SHIN, TCGETA, (ioctl_t) & tty) == 0 &&
1434                 (tty.c_lflag & ICANON))
1435 #  else /* GSTTYB */
1436             if (ioctl(SHIN, TIOCGETP, (ioctl_t) & tty) == 0 &&
1437                 (tty.sg_flags & RAW) == 0)
1438 #  endif /* TERMIO */
1439 # else /* POSIX */
1440             if (tcgetattr(SHIN, &tty) == 0 &&
1441                 (tty.c_lflag & ICANON))
1442 # endif /* POSIX */
1443 #else /* WINNT_NATIVE */
1444             if (isatty(SHIN))
1445 #endif /* !WINNT_NATIVE */
1446             {
1447 #ifdef BSDJOBS
1448                 pid_t ctpgrp;
1449 #endif /* BSDJOBS */
1450
1451                 if (numeof != 0 && ++sincereal >= numeof)       /* Too many EOFs?  Bye! */
1452                     goto oops;
1453 #ifdef BSDJOBS
1454                 if (tpgrp != -1 &&
1455                     (ctpgrp = tcgetpgrp(FSHTTY)) != -1 &&
1456                     tpgrp != ctpgrp) {
1457                     (void) tcsetpgrp(FSHTTY, tpgrp);
1458 # ifdef _SEQUENT_
1459                     if (ctpgrp)
1460 # endif /* _SEQUENT */
1461                     (void) killpg(ctpgrp, SIGHUP);
1462 # ifdef notdef
1463                     /*
1464                      * With the walking process group fix, this message
1465                      * is now obsolete. As the foreground process group
1466                      * changes, the shell needs to adjust. Well too bad.
1467                      */
1468                     xprintf(CGETS(16, 1, "Reset tty pgrp from %d to %d\n"),
1469                             (int)ctpgrp, (int)tpgrp);
1470 # endif /* notdef */
1471                     goto reread;
1472                 }
1473 #endif /* BSDJOBS */
1474                 /* What follows is complicated EOF handling -- sterling@netcom.com */
1475                 /* First, we check to see if we have ignoreeof set */
1476                 if (adrof(STRignoreeof)) {
1477                         /* If so, we check for any stopped jobs only on the first EOF */
1478                         if ((sincereal == 1) && (chkstop == 0)) {
1479                                 panystop(1);
1480                         }
1481                 } else {
1482                         /* If we don't have ignoreeof set, always check for stopped jobs */
1483                         if (chkstop == 0) {
1484                                 panystop(1);
1485                         }
1486                 }
1487                 /* At this point, if there were stopped jobs, we would have already
1488                  * called reset().  If we got this far, assume we can print an
1489                  * exit/logout message if we ignoreeof, or just exit.
1490                  */
1491                 if (adrof(STRignoreeof)) {
1492                         /* If so, tell the user to use exit or logout */
1493                     if (loginsh) {
1494                                 xprintf("%s", CGETS(16, 2,
1495                                         "\nUse \"logout\" to logout.\n"));
1496                         } else {
1497                                 xprintf(CGETS(16, 3,
1498                                         "\nUse \"exit\" to leave %s.\n"),
1499                                         progname);
1500                         }
1501                     reset();
1502                 } else {
1503                         /* If we don't have ignoreeof set, just fall through */
1504                         ;       /* EMPTY */
1505                 }
1506             }
1507     oops:
1508             doneinp = 1;
1509             reset();
1510         }
1511         sincereal = 0;
1512         if (c == '\n' && onelflg)
1513             onelflg--;
1514     } while (c == 0);
1515     Strbuf_append1(&histline, c);
1516     return (c);
1517 }
1518
1519 static void
1520 balloc(int buf)
1521 {
1522     Char **nfbuf;
1523
1524     while (buf >= fblocks) {
1525         nfbuf = xcalloc(fblocks + 2, sizeof(Char **));
1526         if (fbuf) {
1527             (void) blkcpy(nfbuf, fbuf);
1528             xfree(fbuf);
1529         }
1530         fbuf = nfbuf;
1531         fbuf[fblocks] = xcalloc(BUFSIZE, sizeof(Char));
1532         fblocks++;
1533     }
1534 }
1535
1536 static ssize_t
1537 wide_read(int fildes, Char *buf, size_t nchars, int use_fclens)
1538 {
1539     char cbuf[BUFSIZE + 1];
1540     ssize_t res, r = 0;
1541     size_t partial;
1542     int err;
1543
1544     if (nchars == 0)
1545         return 0;
1546     assert (nchars <= sizeof(cbuf) / sizeof(*cbuf));
1547     USE(use_fclens);
1548     res = 0;
1549     partial = 0;
1550     do {
1551         size_t i;
1552         size_t len = nchars > partial ? nchars - partial : 1;
1553
1554         if (partial + len >= sizeof(cbuf) / sizeof(*cbuf))
1555             break;
1556
1557         r = xread(fildes, cbuf + partial, len);
1558
1559         if (partial == 0 && r <= 0)
1560             break;
1561         partial += r;
1562         i = 0;
1563         while (i < partial && nchars != 0) {
1564             int tlen;
1565
1566             tlen = normal_mbtowc(buf + res, cbuf + i, partial - i);
1567             if (tlen == -1) {
1568                 reset_mbtowc();
1569                 if ((partial - i) < MB_LEN_MAX && r > 0)
1570                     /* Maybe a partial character and there is still a chance
1571                        to read more */
1572                     break;
1573                 buf[res] = (unsigned char)cbuf[i] | INVALID_BYTE;
1574             }
1575             if (tlen <= 0)
1576                 tlen = 1;
1577 #ifdef WIDE_STRINGS
1578             if (use_fclens)
1579                 fclens[res] = tlen;
1580 #endif
1581             i += tlen;
1582             res++;
1583             nchars--;
1584         }
1585         if (i != partial)
1586             memmove(cbuf, cbuf + i, partial - i);
1587         partial -= i;
1588     } while (partial != 0 && nchars > 0);
1589     /* Throwing away possible partial multibyte characters on error if the
1590        stream is not seekable */
1591     err = errno;
1592     lseek(fildes, -(off_t)partial, L_INCR);
1593     errno = err;
1594     return res != 0 ? res : r;
1595 }
1596
1597 static eChar
1598 bgetc(void)
1599 {
1600     Char ch;
1601     int c, off, buf;
1602     int numleft = 0, roomleft;
1603
1604     if (cantell) {
1605         if (fseekp < fbobp || fseekp > feobp) {
1606             fbobp = feobp = fseekp;
1607             (void) lseek(SHIN, fseekp, L_SET);
1608         }
1609         if (fseekp == feobp) {
1610 #ifdef WIDE_STRINGS
1611             off_t bytes;
1612             size_t i;
1613
1614             bytes = fbobp;
1615             for (i = 0; i < (size_t)(feobp - fbobp); i++)
1616                 bytes += fclens[i];
1617             fseekp = feobp = bytes;
1618 #endif
1619             fbobp = feobp;
1620             c = wide_read(SHIN, fbuf[0], BUFSIZE, 1);
1621 #ifdef convex
1622             if (c < 0)
1623                 stderror(ERR_SYSTEM, progname, strerror(errno));
1624 #endif /* convex */
1625             if (c <= 0)
1626                 return CHAR_ERR;
1627             feobp += c;
1628         }
1629 #if !defined(WINNT_NATIVE) && !defined(__CYGWIN__)
1630         ch = fbuf[0][fseekp - fbobp];
1631         fseekp++;
1632 #else
1633         do {
1634             ch = fbuf[0][fseekp - fbobp];
1635             fseekp++;
1636         } while(ch == '\r');
1637 #endif /* !WINNT_NATIVE && !__CYGWIN__ */
1638         return (ch);
1639     }
1640
1641     while (fseekp >= feobp) {
1642         if ((editing
1643 #if defined(FILEC) && defined(TIOCSTI)
1644             || filec
1645 #endif /* FILEC && TIOCSTI */
1646             ) && intty) {               /* then use twenex routine */
1647             fseekp = feobp;             /* where else? */
1648 #if defined(FILEC) && defined(TIOCSTI)
1649             if (!editing)
1650                 c = numleft = tenex(InputBuf, BUFSIZE);
1651             else
1652 #endif /* FILEC && TIOCSTI */
1653             c = numleft = Inputl();     /* PWP: get a line */
1654             while (numleft > 0) {
1655                 off = (int) feobp % BUFSIZE;
1656                 buf = (int) feobp / BUFSIZE;
1657                 balloc(buf);
1658                 roomleft = BUFSIZE - off;
1659                 if (roomleft > numleft)
1660                     roomleft = numleft;
1661                 (void) memcpy(fbuf[buf] + off, InputBuf + c - numleft,
1662                               roomleft * sizeof(Char));
1663                 numleft -= roomleft;
1664                 feobp += roomleft;
1665             }
1666         } else {
1667             off = (int) feobp % BUFSIZE;
1668             buf = (int) feobp / BUFSIZE;
1669             balloc(buf);
1670             roomleft = BUFSIZE - off;
1671             c = wide_read(SHIN, fbuf[buf] + off, roomleft, 0);
1672             if (c > 0)
1673                 feobp += c;
1674         }
1675         if (c == 0 || (c < 0 && fixio(SHIN, errno) == -1))
1676             return CHAR_ERR;
1677     }
1678 #ifdef SIG_WINDOW
1679     if (windowchg)
1680         (void) check_window_size(0);    /* for window systems */
1681 #endif /* SIG_WINDOW */
1682 #if !defined(WINNT_NATIVE) && !defined(__CYGWIN__)
1683     ch = fbuf[(int) fseekp / BUFSIZE][(int) fseekp % BUFSIZE];
1684     fseekp++;
1685 #else
1686     do {
1687         ch = fbuf[(int) fseekp / BUFSIZE][(int) fseekp % BUFSIZE];
1688         fseekp++;
1689     } while(ch == '\r');
1690 #endif /* !WINNT_NATIVE && !__CYGWIN__ */
1691     return (ch);
1692 }
1693
1694 static void
1695 bfree(void)
1696 {
1697     int sb, i;
1698
1699     if (cantell)
1700         return;
1701     if (whyles)
1702         return;
1703     sb = (int) (fseekp - 1) / BUFSIZE;
1704     if (sb > 0) {
1705         for (i = 0; i < sb; i++)
1706             xfree(fbuf[i]);
1707         (void) blkcpy(fbuf, &fbuf[sb]);
1708         fseekp -= BUFSIZE * sb;
1709         feobp -= BUFSIZE * sb;
1710         fblocks -= sb;
1711     }
1712 }
1713
1714 void
1715 bseek(struct Ain *l)
1716 {
1717     switch (aret = l->type) {
1718     case TCSH_E_SEEK:
1719         evalvec = l->a_seek;
1720         evalp = l->c_seek;
1721 #ifdef DEBUG_SEEK
1722         xprintf(CGETS(16, 4, "seek to eval %x %x\n"), evalvec, evalp);
1723 #endif
1724         return;
1725     case TCSH_A_SEEK:
1726         alvec = l->a_seek;
1727         alvecp = l->c_seek;
1728 #ifdef DEBUG_SEEK
1729         xprintf(CGETS(16, 5, "seek to alias %x %x\n"), alvec, alvecp);
1730 #endif
1731         return;
1732     case TCSH_F_SEEK:
1733 #ifdef DEBUG_SEEK
1734         xprintf(CGETS(16, 6, "seek to file %x\n"), fseekp);
1735 #endif
1736         fseekp = l->f_seek;
1737 #ifdef WIDE_STRINGS
1738         if (cantell) {
1739             if (fseekp >= fbobp && feobp >= fbobp) {
1740                 size_t i;
1741                 off_t o;
1742
1743                 o = fbobp;
1744                 for (i = 0; i < (size_t)(feobp - fbobp); i++) {
1745                     if (fseekp == o) {
1746                         fseekp = fbobp + i;
1747                         return;
1748                     }
1749                     o += fclens[i];
1750                 }
1751                 if (fseekp == o) {
1752                     fseekp = feobp;
1753                     return;
1754                 }
1755             }
1756             fbobp = feobp = fseekp + 1; /* To force lseek() */
1757         }
1758 #endif
1759         return;
1760     default:
1761         xprintf(CGETS(16, 7, "Bad seek type %d\n"), aret);
1762         abort();
1763     }
1764 }
1765
1766 /* any similarity to bell telephone is purely accidental */
1767 void
1768 btell(struct Ain *l)
1769 {
1770     switch (l->type = aret) {
1771     case TCSH_E_SEEK:
1772         l->a_seek = evalvec;
1773         l->c_seek = evalp;
1774 #ifdef DEBUG_SEEK
1775         xprintf(CGETS(16, 8, "tell eval %x %x\n"), evalvec, evalp);
1776 #endif
1777         return;
1778     case TCSH_A_SEEK:
1779         l->a_seek = alvec;
1780         l->c_seek = alvecp;
1781 #ifdef DEBUG_SEEK
1782         xprintf(CGETS(16, 9, "tell alias %x %x\n"), alvec, alvecp);
1783 #endif
1784         return;
1785     case TCSH_F_SEEK:
1786 #ifdef WIDE_STRINGS
1787         if (cantell && fseekp >= fbobp && fseekp <= feobp) {
1788             size_t i;
1789
1790             l->f_seek = fbobp;
1791             for (i = 0; i < (size_t)(fseekp - fbobp); i++)
1792                 l->f_seek += fclens[i];
1793         } else
1794 #endif
1795             /*SUPPRESS 112*/
1796             l->f_seek = fseekp;
1797         l->a_seek = NULL;
1798 #ifdef DEBUG_SEEK
1799         xprintf(CGETS(16, 10, "tell file %x\n"), fseekp);
1800 #endif
1801         return;
1802     default:
1803         xprintf(CGETS(16, 7, "Bad seek type %d\n"), aret);
1804         abort();
1805     }
1806 }
1807
1808 void
1809 btoeof(void)
1810 {
1811     (void) lseek(SHIN, (off_t) 0, L_XTND);
1812     aret = TCSH_F_SEEK;
1813     fseekp = feobp;
1814     alvec = NULL;
1815     alvecp = NULL;
1816     evalvec = NULL;
1817     evalp = NULL;
1818     wfree();
1819     bfree();
1820 }
1821
1822 void
1823 settell(void)
1824 {
1825     off_t x;
1826     cantell = 0;
1827     if (arginp || onelflg || intty)
1828         return;
1829     if ((x = lseek(SHIN, (off_t) 0, L_INCR)) == -1)
1830         return;
1831     fbuf = xcalloc(2, sizeof(Char **));
1832     fblocks = 1;
1833     fbuf[0] = xcalloc(BUFSIZE, sizeof(Char));
1834     fseekp = fbobp = feobp = x;
1835     cantell = 1;
1836 }