contrib/tcsh-6/glob.c

   1 /*
   2  * Copyright (c) 1989 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Guido van Rossum.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32 #if defined(LIBC_SCCS) && !defined(lint)
  33 static char sccsid[] = "@(#)glob.c      5.12 (Berkeley) 6/24/91";
  34 #endif /* LIBC_SCCS and not lint */
  35 /*
  36  * Glob: the interface is a superset of the one defined in POSIX 1003.2,
  37  * draft 9.
  38  *
  39  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  40  *
  41  * Optional extra services, controlled by flags not defined by POSIX:
  42  *
  43  * GLOB_QUOTE:
  44  *      Escaping convention: \ inhibits any special meaning the following
  45  *      character might have (except \ at end of string is retained).
  46  * GLOB_MAGCHAR:
  47  *      Set in gl_flags if pattern contained a globbing character.
  48  * GLOB_ALTNOT:
  49  *      Use ^ instead of ! for "not".
  50  * gl_matchc:
  51  *      Number of matches in the current invocation of glob.
  52  */
  53
  54 #ifdef WINNT_NATIVE
  55         #pragma warning(disable:4244)
  56 #endif /* WINNT_NATIVE */
  57
  58 #define Char __Char
  59 #include "sh.h"
  60 #include "glob.h"
  61
  62 #ifndef HAVE_MBLEN
  63 #undef mblen
  64 #define mblen(_s,_n)    mbrlen((_s),(_n),NULL)
  65 #endif
  66
  67 #undef Char
  68 #undef QUOTE
  69 #undef TILDE
  70 #undef META
  71 #undef ismeta
  72 #undef Strchr
  73
  74 #ifndef S_ISDIR
  75 #define S_ISDIR(a)      (((a) & S_IFMT) == S_IFDIR)
  76 #endif
  77
  78 #if !defined(S_ISLNK) && defined(S_IFLNK)
  79 #define S_ISLNK(a)      (((a) & S_IFMT) == S_IFLNK)
  80 #endif
  81
  82 #if !defined(S_ISLNK) && !defined(lstat)
  83 #define lstat stat
  84 #endif
  85
  86 typedef unsigned short Char;
  87
  88 static  int      glob1          (Char *, glob_t *, int);
  89 static  int      glob2          (struct strbuf *, const Char *, glob_t *, int);
  90 static  int      glob3          (struct strbuf *, const Char *, const Char *,
  91                                  const Char *, glob_t *, int);
  92 static  void     globextend     (const char *, glob_t *);
  93 static  int      match          (const char *, const Char *, const Char *,
  94                                  int);
  95 static  int      compare        (const void *, const void *);
  96 static  DIR     *Opendir        (const char *);
  97 #ifdef S_IFLNK
  98 static  int      Lstat          (const char *, struct stat *);
  99 #endif
 100 static  int      Stat           (const char *, struct stat *sb);
 101 static  Char    *Strchr         (Char *, int);
 102 #ifdef DEBUG
 103 static  void     qprintf        (const char *, const Char *);
 104 #endif
 105
 106 #define DOLLAR          '$'
 107 #define DOT             '.'
 108 #define EOS             '\0'
 109 #define LBRACKET        '['
 110 #define NOT             '!'
 111 #define ALTNOT          '^'
 112 #define QUESTION        '?'
 113 #define QUOTE           '\\'
 114 #define RANGE           '-'
 115 #define RBRACKET        ']'
 116 #define SEP             '/'
 117 #define STAR            '*'
 118 #define TILDE           '~'
 119 #define UNDERSCORE      '_'
 120
 121 #define M_META          0x8000
 122 #define M_PROTECT       0x4000
 123 #define M_MASK          0xffff
 124 #define M_ASCII         0x00ff
 125
 126 #define LCHAR(c)        ((c)&M_ASCII)
 127 #define META(c)         ((c)|M_META)
 128 #define M_ALL           META('*')
 129 #define M_END           META(']')
 130 #define M_NOT           META('!')
 131 #define M_ALTNOT        META('^')
 132 #define M_ONE           META('?')
 133 #define M_RNG           META('-')
 134 #define M_SET           META('[')
 135 #define ismeta(c)       (((c)&M_META) != 0)
 136
 137 int
 138 globcharcoll(__Char c1, __Char c2, int cs)
 139 {
 140 #if defined(NLS) && defined(LC_COLLATE) && defined(HAVE_STRCOLL)
 141 # if defined(WIDE_STRINGS)
 142     wchar_t s1[2], s2[2];
 143
 144     if (c1 == c2)
 145         return (0);
 146     if (cs) {
 147         c1 = towlower(c1);
 148         c2 = towlower(c2);
 149     } else {
 150         /* This should not be here, but I'll rather leave it in than engage in
 151            a LC_COLLATE flamewar about a shell I don't use... */
 152         if (iswlower(c1) && iswupper(c2))
 153             return (1);
 154         if (iswupper(c1) && iswlower(c2))
 155             return (-1);
 156     }
 157     s1[0] = c1;
 158     s2[0] = c2;
 159     s1[1] = s2[1] = '\0';
 160     return wcscoll(s1, s2);
 161 # else /* not WIDE_STRINGS */
 162     char s1[2], s2[2];
 163
 164     if (c1 == c2)
 165         return (0);
 166     /*
 167      * From kevin lyda <kevin@suberic.net>:
 168      * strcoll does not guarantee case sorting, so we pre-process now:
 169      */
 170     if (cs) {
 171         c1 = islower(c1) ? c1 : tolower(c1);
 172         c2 = islower(c2) ? c2 : tolower(c2);
 173     } else {
 174         if (islower(c1) && isupper(c2))
 175             return (1);
 176         if (isupper(c1) && islower(c2))
 177             return (-1);
 178     }
 179     s1[0] = c1;
 180     s2[0] = c2;
 181     s1[1] = s2[1] = '\0';
 182     return strcoll(s1, s2);
 183 # endif
 184 #else
 185     return (c1 - c2);
 186 #endif
 187 }
 188
 189 /*
 190  * Need to dodge two kernel bugs:
 191  * opendir("") != opendir(".")
 192  * NAMEI_BUG: on plain files trailing slashes are ignored in some kernels.
 193  *            POSIX specifies that they should be ignored in directories.
 194  */
 195
 196 static DIR *
 197 Opendir(const char *str)
 198 {
 199 #if defined(hpux) || defined(__hpux)
 200     struct stat st;
 201 #endif
 202
 203     if (!*str)
 204         return (opendir("."));
 205 #if defined(hpux) || defined(__hpux)
 206     /*
 207      * Opendir on some device files hangs, so avoid it
 208      */
 209     if (stat(str, &st) == -1 || !S_ISDIR(st.st_mode))
 210         return NULL;
 211 #endif
 212     return opendir(str);
 213 }
 214
 215 #ifdef S_IFLNK
 216 static int
 217 Lstat(const char *fn, struct stat *sb)
 218 {
 219     int st;
 220
 221     st = lstat(fn, sb);
 222 # ifdef NAMEI_BUG
 223     if (*fn != 0 && strend(fn)[-1] == '/' && !S_ISDIR(sb->st_mode))
 224         st = -1;
 225 # endif /* NAMEI_BUG */
 226     return st;
 227 }
 228 #else
 229 #define Lstat Stat
 230 #endif /* S_IFLNK */
 231
 232 static int
 233 Stat(const char *fn, struct stat *sb)
 234 {
 235     int st;
 236
 237     st = stat(fn, sb);
 238 #ifdef NAMEI_BUG
 239     if (*fn != 0 && strend(fn)[-1] == '/' && !S_ISDIR(sb->st_mode))
 240         st = -1;
 241 #endif /* NAMEI_BUG */
 242     return st;
 243 }
 244
 245 static Char *
 246 Strchr(Char *str, int ch)
 247 {
 248     do
 249         if (*str == ch)
 250             return (str);
 251     while (*str++);
 252     return (NULL);
 253 }
 254
 255 #ifdef DEBUG
 256 static void
 257 qprintf(const char *pre, const Char *s)
 258 {
 259     const Char *p;
 260
 261     xprintf("%s", pre);
 262     for (p = s; *p; p++)
 263         xprintf("%c", *p & 0xff);
 264     xprintf("\n%s", pre);
 265     for (p = s; *p; p++)
 266         xprintf("%c", *p & M_PROTECT ? '"' : ' ');
 267     xprintf("\n%s", pre);
 268     for (p = s; *p; p++)
 269         xprintf("%c", *p & M_META ? '_' : ' ');
 270     xprintf("\n");
 271 }
 272 #endif /* DEBUG */
 273
 274 static int
 275 compare(const void *p, const void *q)
 276 {
 277 #if defined(NLS) && defined(HAVE_STRCOLL)
 278     return (strcoll(*(char *const *) p, *(char *const *) q));
 279 #else
 280     return (strcmp(*(char *const *) p, *(char *const *) q));
 281 #endif /* NLS && HAVE_STRCOLL */
 282 }
 283
 284 /*
 285  * The main glob() routine: compiles the pattern (optionally processing
 286  * quotes), calls glob1() to do the real pattern matching, and finally
 287  * sorts the list (unless unsorted operation is requested).  Returns 0
 288  * if things went well, nonzero if errors occurred.  It is not an error
 289  * to find no matches.
 290  */
 291 int
 292 glob(const char *pattern, int flags, int (*errfunc) (const char *, int),
 293      glob_t *pglob)
 294 {
 295     int     err, oldpathc;
 296     Char *bufnext, m_not;
 297     const unsigned char *patnext;
 298     int     c, not;
 299     Char *qpatnext, *patbuf;
 300     int     no_match;
 301
 302     patnext = (const unsigned char *) pattern;
 303     if (!(flags & GLOB_APPEND)) {
 304         pglob->gl_pathc = 0;
 305         pglob->gl_pathv = NULL;
 306         if (!(flags & GLOB_DOOFFS))
 307             pglob->gl_offs = 0;
 308     }
 309     pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 310     pglob->gl_errfunc = errfunc;
 311     oldpathc = pglob->gl_pathc;
 312     pglob->gl_matchc = 0;
 313
 314     if (pglob->gl_flags & GLOB_ALTNOT) {
 315         not = ALTNOT;
 316         m_not = M_ALTNOT;
 317     }
 318     else {
 319         not = NOT;
 320         m_not = M_NOT;
 321     }
 322
 323     patbuf = xmalloc((strlen(pattern) + 1) * sizeof(*patbuf));
 324     bufnext = patbuf;
 325
 326     no_match = *patnext == not;
 327     if (no_match)
 328         patnext++;
 329
 330     if (flags & GLOB_QUOTE) {
 331         /* Protect the quoted characters */
 332         while ((c = *patnext++) != EOS) {
 333 #ifdef WIDE_STRINGS
 334             int len;
 335
 336             len = mblen((const char *)(patnext - 1), MB_LEN_MAX);
 337             if (len == -1)
 338                 TCSH_IGNORE(mblen(NULL, 0));
 339             else if (len > 1) {
 340                 *bufnext++ = (Char) c;
 341                 while (--len != 0)
 342                     *bufnext++ = (Char) (*patnext++ | M_PROTECT);
 343             } else
 344 #endif /* WIDE_STRINGS */
 345             if (c == QUOTE) {
 346                 if ((c = *patnext++) == EOS) {
 347                     c = QUOTE;
 348                     --patnext;
 349                 }
 350                 *bufnext++ = (Char) (c | M_PROTECT);
 351             }
 352             else
 353                 *bufnext++ = (Char) c;
 354         }
 355     }
 356     else
 357         while ((c = *patnext++) != EOS)
 358             *bufnext++ = (Char) c;
 359     *bufnext = EOS;
 360
 361     bufnext = patbuf;
 362     qpatnext = patbuf;
 363     while ((c = *qpatnext++) != EOS) {
 364         switch (c) {
 365         case LBRACKET:
 366             c = *qpatnext;
 367             if (c == not)
 368                 ++qpatnext;
 369             if (*qpatnext == EOS ||
 370                 Strchr(qpatnext + 1, RBRACKET) == NULL) {
 371                 *bufnext++ = LBRACKET;
 372                 if (c == not)
 373                     --qpatnext;
 374                 break;
 375             }
 376             pglob->gl_flags |= GLOB_MAGCHAR;
 377             *bufnext++ = M_SET;
 378             if (c == not)
 379                 *bufnext++ = m_not;
 380             c = *qpatnext++;
 381             do {
 382                 *bufnext++ = LCHAR(c);
 383                 if (*qpatnext == RANGE &&
 384                     (c = qpatnext[1]) != RBRACKET) {
 385                     *bufnext++ = M_RNG;
 386                     *bufnext++ = LCHAR(c);
 387                     qpatnext += 2;
 388                 }
 389             } while ((c = *qpatnext++) != RBRACKET);
 390             *bufnext++ = M_END;
 391             break;
 392         case QUESTION:
 393             pglob->gl_flags |= GLOB_MAGCHAR;
 394             *bufnext++ = M_ONE;
 395             break;
 396         case STAR:
 397             pglob->gl_flags |= GLOB_MAGCHAR;
 398             /* collapse adjacent stars to one [or three if globstar],
 399              * to avoid exponential behavior
 400              */
 401             if (bufnext == patbuf || bufnext[-1] != M_ALL ||
 402                ((flags & GLOB_STAR) != 0 &&
 403                  (bufnext - 1 == patbuf || bufnext[-2] != M_ALL ||
 404                  bufnext - 2 == patbuf || bufnext[-3] != M_ALL)))
 405                 *bufnext++ = M_ALL;
 406             break;
 407         default:
 408             *bufnext++ = LCHAR(c);
 409             break;
 410         }
 411     }
 412     *bufnext = EOS;
 413 #ifdef DEBUG
 414     qprintf("patbuf=", patbuf);
 415 #endif
 416
 417     if ((err = glob1(patbuf, pglob, no_match)) != 0) {
 418         xfree(patbuf);
 419         return (err);
 420     }
 421
 422     /*
 423      * If there was no match we are going to append the pattern
 424      * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 425      * and the pattern did not contain any magic characters
 426      * GLOB_NOMAGIC is there just for compatibility with csh.
 427      */
 428     if (pglob->gl_pathc == oldpathc &&
 429         ((flags & GLOB_NOCHECK) ||
 430          ((flags & GLOB_NOMAGIC) && !(pglob->gl_flags & GLOB_MAGCHAR)))) {
 431         if (!(flags & GLOB_QUOTE))
 432             globextend(pattern, pglob);
 433         else {
 434             char *copy, *dest;
 435             const char *src;
 436
 437             /* copy pattern, interpreting quotes */
 438             copy = xmalloc(strlen(pattern) + 1);
 439             dest = copy;
 440             src = pattern;
 441             while (*src != EOS) {
 442                 /* Don't interpret quotes. The spec does not say we should do */
 443                 if (*src == QUOTE) {
 444                     if (*++src == EOS)
 445                         --src;
 446                 }
 447                 *dest++ = *src++;
 448             }
 449             *dest = EOS;
 450             globextend(copy, pglob);
 451             xfree(copy);
 452         }
 453         xfree(patbuf);
 454         return 0;
 455     }
 456     else if (!(flags & GLOB_NOSORT) && (pglob->gl_pathc != oldpathc))
 457         qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 458               pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 459     xfree(patbuf);
 460     return (0);
 461 }
 462
 463 static int
 464 glob1(Char *pattern, glob_t *pglob, int no_match)
 465 {
 466     struct strbuf pathbuf = strbuf_INIT;
 467     int err;
 468
 469     /*
 470      * a null pathname is invalid -- POSIX 1003.1 sect. 2.4.
 471      */
 472     if (*pattern == EOS)
 473         return (0);
 474     err = glob2(&pathbuf, pattern, pglob, no_match);
 475     xfree(pathbuf.s);
 476     return err;
 477 }
 478
 479 /*
 480  * functions glob2 and glob3 are mutually recursive; there is one level
 481  * of recursion for each segment in the pattern that contains one or
 482  * more meta characters.
 483  */
 484 static int
 485 glob2(struct strbuf *pathbuf, const Char *pattern, glob_t *pglob, int no_match)
 486 {
 487     struct stat sbuf;
 488     int anymeta;
 489     const Char *p;
 490     size_t orig_len;
 491
 492     /*
 493      * loop over pattern segments until end of pattern or until segment with
 494      * meta character found.
 495      */
 496     anymeta = 0;
 497     for (;;) {
 498         if (*pattern == EOS) {  /* end of pattern? */
 499             strbuf_terminate(pathbuf);
 500
 501             if (Lstat(pathbuf->s, &sbuf))
 502                 return (0);
 503
 504             if (((pglob->gl_flags & GLOB_MARK) &&
 505                  pathbuf->s[pathbuf->len - 1] != SEP) &&
 506                 (S_ISDIR(sbuf.st_mode)
 507 #ifdef S_IFLNK
 508                  || (S_ISLNK(sbuf.st_mode) &&
 509                      (Stat(pathbuf->s, &sbuf) == 0) &&
 510                      S_ISDIR(sbuf.st_mode))
 511 #endif
 512                  )) {
 513                 strbuf_append1(pathbuf, SEP);
 514                 strbuf_terminate(pathbuf);
 515             }
 516             ++pglob->gl_matchc;
 517             globextend(pathbuf->s, pglob);
 518             return 0;
 519         }
 520
 521         /* find end of next segment, tentatively copy to pathbuf */
 522         p = pattern;
 523         orig_len = pathbuf->len;
 524         while (*p != EOS && *p != SEP) {
 525             if (ismeta(*p))
 526                 anymeta = 1;
 527             strbuf_append1(pathbuf, *p++);
 528         }
 529
 530         if (!anymeta) {         /* no expansion, do next segment */
 531             pattern = p;
 532             while (*pattern == SEP)
 533                 strbuf_append1(pathbuf, *pattern++);
 534         }
 535         else {                  /* need expansion, recurse */
 536             pathbuf->len = orig_len;
 537             return (glob3(pathbuf, pattern, p, pattern, pglob, no_match));
 538         }
 539     }
 540     /* NOTREACHED */
 541 }
 542
 543 static size_t
 544 One_Char_mbtowc(__Char *pwc, const Char *s, size_t n)
 545 {
 546 #ifdef WIDE_STRINGS
 547     char buf[MB_LEN_MAX], *p;
 548
 549     if (n > MB_LEN_MAX)
 550         n = MB_LEN_MAX;
 551     p = buf;
 552     while (p < buf + n && (*p++ = LCHAR(*s++)) != 0)
 553         ;
 554     return one_mbtowc(pwc, buf, n);
 555 #else
 556     (void)n;
 557     *pwc = *s & CHAR;
 558     return 1;
 559 #endif
 560 }
 561
 562 static int
 563 glob3(struct strbuf *pathbuf, const Char *pattern, const Char *restpattern,
 564       const Char *pglobstar, glob_t *pglob, int no_match)
 565 {
 566     DIR    *dirp;
 567     struct dirent *dp;
 568     struct stat sbuf;
 569     int     err;
 570     Char m_not = (pglob->gl_flags & GLOB_ALTNOT) ? M_ALTNOT : M_NOT;
 571     size_t orig_len;
 572     int globstar = 0;
 573     int chase_symlinks = 0;
 574     const Char *termstar = NULL;
 575
 576     strbuf_terminate(pathbuf);
 577     orig_len = pathbuf->len;
 578     errno = err = 0;
 579
 580     while (pglobstar < restpattern) {
 581         __Char wc;
 582         size_t width = One_Char_mbtowc(&wc, pglobstar, MB_LEN_MAX);
 583         if ((pglobstar[0] & M_MASK) == M_ALL &&
 584             (pglobstar[width] & M_MASK) == M_ALL) {
 585             globstar = 1;
 586             chase_symlinks = (pglobstar[2 * width] & M_MASK) == M_ALL;
 587             termstar = pglobstar + (2 + chase_symlinks) * width;
 588             break;
 589         }
 590         pglobstar += width;
 591     }
 592
 593     if (globstar) {
 594         err = pglobstar==pattern && termstar==restpattern ?
 595                 *restpattern == EOS ?
 596                 glob2(pathbuf, restpattern - 1, pglob, no_match) :
 597                 glob2(pathbuf, restpattern + 1, pglob, no_match) :
 598                 glob3(pathbuf, pattern, restpattern, termstar, pglob, no_match);
 599         if (err)
 600             return err;
 601         pathbuf->len = orig_len;
 602         strbuf_terminate(pathbuf);
 603     }
 604
 605     if (*pathbuf->s && (Lstat(pathbuf->s, &sbuf) || !S_ISDIR(sbuf.st_mode)
 606 #ifdef S_IFLINK
 607              && ((globstar && !chase_symlinks) || !S_ISLNK(sbuf.st_mode))
 608 #endif
 609         ))
 610         return 0;
 611
 612     if (!(dirp = Opendir(pathbuf->s))) {
 613         /* todo: don't call for ENOENT or ENOTDIR? */
 614         if ((pglob->gl_errfunc && (*pglob->gl_errfunc) (pathbuf->s, errno)) ||
 615             (pglob->gl_flags & GLOB_ERR))
 616             return (GLOB_ABEND);
 617         else
 618             return (0);
 619     }
 620
 621     /* search directory for matching names */
 622     while ((dp = readdir(dirp)) != NULL) {
 623         /* initial DOT must be matched literally */
 624         if (dp->d_name[0] == DOT && *pattern != DOT)
 625             if (!(pglob->gl_flags & GLOB_DOT) || !dp->d_name[1] ||
 626                 (dp->d_name[1] == DOT && !dp->d_name[2]))
 627                 continue; /*unless globdot and not . or .. */
 628         pathbuf->len = orig_len;
 629         strbuf_append(pathbuf, dp->d_name);
 630         strbuf_terminate(pathbuf);
 631
 632         if (globstar) {
 633 #ifdef S_IFLNK
 634             if (!chase_symlinks &&
 635                 (Lstat(pathbuf->s, &sbuf) || S_ISLNK(sbuf.st_mode)))
 636                     continue;
 637 #endif
 638             if (match(pathbuf->s + orig_len, pattern, termstar,
 639                 (int)m_not) == no_match)
 640                     continue;
 641             strbuf_append1(pathbuf, SEP);
 642             strbuf_terminate(pathbuf);
 643             if ((err = glob2(pathbuf, pglobstar, pglob, no_match)) != 0)
 644                 break;
 645         } else {
 646             if (match(pathbuf->s + orig_len, pattern, restpattern,
 647                 (int) m_not) == no_match)
 648                 continue;
 649             if ((err = glob2(pathbuf, restpattern, pglob, no_match)) != 0)
 650                 break;
 651         }
 652     }
 653     /* todo: check error from readdir? */
 654     closedir(dirp);
 655     return (err);
 656 }
 657
 658
 659 /*
 660  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 661  * add the new item, and update gl_pathc.
 662  *
 663  * This assumes the BSD realloc, which only copies the block when its size
 664  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 665  * behavior.
 666  *
 667  * Return 0 if new item added, error code if memory couldn't be allocated.
 668  *
 669  * Invariant of the glob_t structure:
 670  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 671  *       gl_pathv points to (gl_offs + gl_pathc + 1) items.
 672  */
 673 static void
 674 globextend(const char *path, glob_t *pglob)
 675 {
 676     char **pathv;
 677     int i;
 678     size_t newsize;
 679
 680     newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 681     pathv = xrealloc(pglob->gl_pathv, newsize);
 682
 683     if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 684         /* first time around -- clear initial gl_offs items */
 685         pathv += pglob->gl_offs;
 686         for (i = pglob->gl_offs; --i >= 0;)
 687             *--pathv = NULL;
 688     }
 689     pglob->gl_pathv = pathv;
 690
 691     pathv[pglob->gl_offs + pglob->gl_pathc++] = strsave(path);
 692     pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 693 }
 694
 695 /*
 696  * pattern matching function for filenames.
 697  */
 698 static  int
 699 match(const char *name, const Char *pat, const Char *patend, int m_not)
 700 {
 701     int ok, negate_range;
 702     const Char *patNext;
 703     const char *nameNext, *nameStart, *nameEnd;
 704     Char c;
 705
 706     patNext = pat;
 707     nameStart = nameNext = name;
 708     nameEnd = NULL;
 709
 710     while (pat < patend || *name) {
 711         size_t lwk, pwk;
 712         __Char wc, wk, wc1;
 713
 714         c = *pat; /* Only for M_MASK bits */
 715         if (*name == EOS)
 716                 nameEnd = name;
 717
 718         pwk = One_Char_mbtowc(&wc, pat, MB_LEN_MAX);
 719         lwk = one_mbtowc(&wk, name, MB_LEN_MAX);
 720         switch (c & M_MASK) {
 721         case M_ALL:
 722             while ((*(pat + pwk) & M_MASK) == M_ALL) {
 723                 pat += pwk;
 724                 pwk = One_Char_mbtowc(&wc, pat, MB_LEN_MAX);
 725             }
 726             patNext = pat;
 727             nameNext = name + lwk;
 728             pat += pwk;
 729             continue;
 730         case M_ONE:
 731             if (*name == EOS)
 732                 break;
 733             name += lwk;
 734             pat += pwk;
 735             continue;
 736         case M_SET:
 737             ok = 0;
 738             if (*name == EOS)
 739                 break;
 740             pat += pwk;
 741             pwk = One_Char_mbtowc(&wc, pat, MB_LEN_MAX);
 742             name += lwk;
 743             if ((negate_range = ((*pat & M_MASK) == m_not)) != 0) {
 744                 pat += pwk;
 745                 pwk = One_Char_mbtowc(&wc, pat, MB_LEN_MAX);
 746             }
 747             wc1 = wc;
 748             while ((*pat & M_MASK) != M_END) {
 749                 if ((*pat & M_MASK) == M_RNG) {
 750                     __Char wc2;
 751
 752                     pat += pwk;
 753                     pwk = One_Char_mbtowc(&wc2, pat, MB_LEN_MAX);
 754                     if (globcharcoll(wc1, wk, 0) <= 0 &&
 755                         globcharcoll(wk, wc2, 0) <= 0)
 756                         ok = 1;
 757                 } else if (wc == wk)
 758                     ok = 1;
 759                 pat += pwk;
 760                 wc1 = wc;
 761                 pwk = One_Char_mbtowc(&wc, pat, MB_LEN_MAX);
 762             }
 763             pat += pwk;
 764             pwk = One_Char_mbtowc(&wc, pat, MB_LEN_MAX);
 765             if (ok == negate_range)
 766                 break;
 767             continue;
 768         default:
 769             if (*name == EOS || samecase(wk) != samecase(wc))
 770                 break;
 771             name += lwk;
 772             pat += pwk;
 773             continue;
 774         }
 775         if (nameNext != nameStart
 776             && (nameEnd == NULL || nameNext <= nameEnd)) {
 777             pat = patNext;
 778             name = nameNext;
 779             continue;
 780         }
 781         return 0;
 782     }
 783     return 1;
 784 }
 785
 786 /* free allocated data belonging to a glob_t structure */
 787 void
 788 globfree(glob_t *pglob)
 789 {
 790     int i;
 791     char **pp;
 792
 793     if (pglob->gl_pathv != NULL) {
 794         pp = pglob->gl_pathv + pglob->gl_offs;
 795         for (i = pglob->gl_pathc; i--; ++pp)
 796             if (*pp)
 797                 xfree(*pp), *pp = NULL;
 798         xfree(pglob->gl_pathv), pglob->gl_pathv = NULL;
 799     }
 800 }