lib/roken/glob.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 /*
  38  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  39  *
  40  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  41  *
  42  * Optional extra services, controlled by flags not defined by POSIX:
  43  *
  44  * GLOB_QUOTE:
  45  *      Escaping convention: \ inhibits any special meaning the following
  46  *      character might have (except \ at end of string is retained).
  47  * GLOB_MAGCHAR:
  48  *      Set in gl_flags if pattern contained a globbing character.
  49  * GLOB_NOMAGIC:
  50  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  51  *      not contain any magic characters.  [Used in csh style globbing]
  52  * GLOB_ALTDIRFUNC:
  53  *      Use alternately specified directory access functions.
  54  * GLOB_TILDE:
  55  *      expand ~user/foo to the /home/dir/of/user/foo
  56  * GLOB_BRACE:
  57  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  58  * gl_matchc:
  59  *      Number of matches in the current invocation of glob.
  60  */
  61
  62 #ifdef HAVE_CONFIG_H
  63 #include <config.h>
  64 #endif
  65
  66 #ifdef HAVE_SYS_PARAM_H
  67 #include <sys/param.h>
  68 #endif
  69 #ifdef HAVE_SYS_TYPES_H
  70 #include <sys/types.h>
  71 #endif
  72 #ifdef HAVE_SYS_STAT_H
  73 #include <sys/stat.h>
  74 #endif
  75
  76 #include <ctype.h>
  77 #ifdef HAVE_DIRENT_H
  78 #include <dirent.h>
  79 #endif
  80 #include <errno.h>
  81 #ifdef HAVE_PWD_H
  82 #include <pwd.h>
  83 #endif
  84 #include <stdio.h>
  85 #include <stdlib.h>
  86 #include <string.h>
  87 #ifdef HAVE_UNISTD_H
  88 #include <unistd.h>
  89 #endif
  90
  91 #include "glob.h"
  92 #include "roken.h"
  93
  94 #define CHAR_DOLLAR             '$'
  95 #define CHAR_DOT                '.'
  96 #define CHAR_EOS                '\0'
  97 #define CHAR_LBRACKET           '['
  98 #define CHAR_NOT                '!'
  99 #define CHAR_QUESTION           '?'
 100 #define CHAR_QUOTE              '\\'
 101 #define CHAR_RANGE              '-'
 102 #define CHAR_RBRACKET           ']'
 103 #define CHAR_SEP                '/'
 104 #define CHAR_STAR               '*'
 105 #define CHAR_TILDE              '~'
 106 #define CHAR_UNDERSCORE         '_'
 107 #define CHAR_LBRACE             '{'
 108 #define CHAR_RBRACE             '}'
 109 #define CHAR_SLASH              '/'
 110 #define CHAR_COMMA              ','
 111
 112 #ifndef DEBUG
 113
 114 #define M_QUOTE         0x8000
 115 #define M_PROTECT       0x4000
 116 #define M_MASK          0xffff
 117 #define M_ASCII         0x00ff
 118
 119 typedef u_short Char;
 120
 121 #else
 122
 123 #define M_QUOTE         0x80
 124 #define M_PROTECT       0x40
 125 #define M_MASK          0xff
 126 #define M_ASCII         0x7f
 127
 128 typedef char Char;
 129
 130 #endif
 131
 132
 133 #define CHAR(c)         ((Char)((c)&M_ASCII))
 134 #define META(c)         ((Char)((c)|M_QUOTE))
 135 #define M_ALL           META('*')
 136 #define M_END           META(']')
 137 #define M_NOT           META('!')
 138 #define M_ONE           META('?')
 139 #define M_RNG           META('-')
 140 #define M_SET           META('[')
 141 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 142
 143
 144 static int       compare (const void *, const void *);
 145 static void      g_Ctoc (const Char *, char *);
 146 static int       g_lstat (Char *, struct stat *, glob_t *);
 147 static DIR      *g_opendir (Char *, glob_t *);
 148 static Char     *g_strchr (Char *, int);
 149 #ifdef notdef
 150 static Char     *g_strcat (Char *, const Char *);
 151 #endif
 152 static int       g_stat (Char *, struct stat *, glob_t *);
 153 static int       glob0 (const Char *, glob_t *);
 154 static int       glob1 (Char *, glob_t *);
 155 static int       glob2 (Char *, Char *, Char *, glob_t *);
 156 static int       glob3 (Char *, Char *, Char *, Char *, glob_t *);
 157 static int       globextend (const Char *, glob_t *);
 158 static const Char *      globtilde (const Char *, Char *, glob_t *);
 159 static int       globexp1 (const Char *, glob_t *);
 160 static int       globexp2 (const Char *, const Char *, glob_t *, int *);
 161 static int       match (Char *, Char *, Char *);
 162 #ifdef DEBUG
 163 static void      qprintf (const char *, Char *);
 164 #endif
 165
 166 int
 167 glob(const char *pattern,
 168      int flags,
 169      int (*errfunc)(const char *, int),
 170      glob_t *pglob)
 171 {
 172         const u_char *patnext;
 173         int c;
 174         Char *bufnext, *bufend, patbuf[MaxPathLen+1];
 175
 176         patnext = (u_char *) pattern;
 177         if (!(flags & GLOB_APPEND)) {
 178                 pglob->gl_pathc = 0;
 179                 pglob->gl_pathv = NULL;
 180                 if (!(flags & GLOB_DOOFFS))
 181                         pglob->gl_offs = 0;
 182         }
 183         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 184         pglob->gl_errfunc = errfunc;
 185         pglob->gl_matchc = 0;
 186
 187         bufnext = patbuf;
 188         bufend = bufnext + MaxPathLen;
 189         if (flags & GLOB_QUOTE) {
 190                 /* Protect the quoted characters. */
 191                 while (bufnext < bufend && (c = *patnext++) != CHAR_EOS)
 192                         if (c == CHAR_QUOTE) {
 193                                 if ((c = *patnext++) == CHAR_EOS) {
 194                                         c = CHAR_QUOTE;
 195                                         --patnext;
 196                                 }
 197                                 *bufnext++ = c | M_PROTECT;
 198                         }
 199                         else
 200                                 *bufnext++ = c;
 201         }
 202         else
 203             while (bufnext < bufend && (c = *patnext++) != CHAR_EOS)
 204                     *bufnext++ = c;
 205         *bufnext = CHAR_EOS;
 206
 207         if (flags & GLOB_BRACE)
 208             return globexp1(patbuf, pglob);
 209         else
 210             return glob0(patbuf, pglob);
 211 }
 212
 213 /*
 214  * Expand recursively a glob {} pattern. When there is no more expansion
 215  * invoke the standard globbing routine to glob the rest of the magic
 216  * characters
 217  */
 218 static int globexp1(const Char *pattern, glob_t *pglob)
 219 {
 220         const Char* ptr = pattern;
 221         int rv;
 222
 223         /* Protect a single {}, for find(1), like csh */
 224         if (pattern[0] == CHAR_LBRACE && pattern[1] == CHAR_RBRACE && pattern[2] == CHAR_EOS)
 225                 return glob0(pattern, pglob);
 226
 227         while ((ptr = (const Char *) g_strchr((Char *) ptr, CHAR_LBRACE)) != NULL)
 228                 if (!globexp2(ptr, pattern, pglob, &rv))
 229                         return rv;
 230
 231         return glob0(pattern, pglob);
 232 }
 233
 234
 235 /*
 236  * Recursive brace globbing helper. Tries to expand a single brace.
 237  * If it succeeds then it invokes globexp1 with the new pattern.
 238  * If it fails then it tries to glob the rest of the pattern and returns.
 239  */
 240 static int globexp2(const Char *ptr, const Char *pattern,
 241                     glob_t *pglob, int *rv)
 242 {
 243         int     i;
 244         Char   *lm, *ls;
 245         const Char *pe, *pm, *pl;
 246         Char    patbuf[MaxPathLen + 1];
 247
 248         /* copy part up to the brace */
 249         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 250                 continue;
 251         ls = lm;
 252
 253         /* Find the balanced brace */
 254         for (i = 0, pe = ++ptr; *pe; pe++)
 255                 if (*pe == CHAR_LBRACKET) {
 256                         /* Ignore everything between [] */
 257                         for (pm = pe++; *pe != CHAR_RBRACKET && *pe != CHAR_EOS; pe++)
 258                                 continue;
 259                         if (*pe == CHAR_EOS) {
 260                                 /*
 261                                  * We could not find a matching CHAR_RBRACKET.
 262                                  * Ignore and just look for CHAR_RBRACE
 263                                  */
 264                                 pe = pm;
 265                         }
 266                 }
 267                 else if (*pe == CHAR_LBRACE)
 268                         i++;
 269                 else if (*pe == CHAR_RBRACE) {
 270                         if (i == 0)
 271                                 break;
 272                         i--;
 273                 }
 274
 275         /* Non matching braces; just glob the pattern */
 276         if (i != 0 || *pe == CHAR_EOS) {
 277                 *rv = glob0(patbuf, pglob);
 278                 return 0;
 279         }
 280
 281         for (i = 0, pl = pm = ptr; pm <= pe; pm++)
 282                 switch (*pm) {
 283                 case CHAR_LBRACKET:
 284                         /* Ignore everything between [] */
 285                         for (pl = pm++; *pm != CHAR_RBRACKET && *pm != CHAR_EOS; pm++)
 286                                 continue;
 287                         if (*pm == CHAR_EOS) {
 288                                 /*
 289                                  * We could not find a matching CHAR_RBRACKET.
 290                                  * Ignore and just look for CHAR_RBRACE
 291                                  */
 292                                 pm = pl;
 293                         }
 294                         break;
 295
 296                 case CHAR_LBRACE:
 297                         i++;
 298                         break;
 299
 300                 case CHAR_RBRACE:
 301                         if (i) {
 302                             i--;
 303                             break;
 304                         }
 305                         /* FALLTHROUGH */
 306                 case CHAR_COMMA:
 307                         if (i && *pm == CHAR_COMMA)
 308                                 break;
 309                         else {
 310                                 /* Append the current string */
 311                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 312                                         continue;
 313                                 /*
 314                                  * Append the rest of the pattern after the
 315                                  * closing brace
 316                                  */
 317                                 for (pl = pe + 1; (*lm++ = *pl++) != CHAR_EOS;)
 318                                         continue;
 319
 320                                 /* Expand the current pattern */
 321 #ifdef DEBUG
 322                                 qprintf("globexp2:", patbuf);
 323 #endif
 324                                 *rv = globexp1(patbuf, pglob);
 325
 326                                 /* move after the comma, to the next string */
 327                                 pl = pm + 1;
 328                         }
 329                         break;
 330
 331                 default:
 332                         break;
 333                 }
 334         *rv = 0;
 335         return 0;
 336 }
 337
 338
 339
 340 /*
 341  * expand tilde from the passwd file.
 342  */
 343 static const Char *
 344 globtilde(const Char *pattern, Char *patbuf, glob_t *pglob)
 345 {
 346         struct passwd *pwd;
 347         char *h;
 348         const Char *p;
 349         Char *b;
 350
 351         if (*pattern != CHAR_TILDE || !(pglob->gl_flags & GLOB_TILDE))
 352                 return pattern;
 353
 354         /* Copy up to the end of the string or / */
 355         for (p = pattern + 1, h = (char *) patbuf; *p && *p != CHAR_SLASH;
 356              *h++ = *p++)
 357                 continue;
 358
 359         *h = CHAR_EOS;
 360
 361         if (((char *) patbuf)[0] == CHAR_EOS) {
 362                 /*
 363                  * handle a plain ~ or ~/ by expanding $HOME
 364                  * first and then trying the password file
 365                  */
 366                 if ((h = getenv("HOME")) == NULL) {
 367                         if ((pwd = k_getpwuid(getuid())) == NULL)
 368                                 return pattern;
 369                         else
 370                                 h = pwd->pw_dir;
 371                 }
 372         }
 373         else {
 374                 /*
 375                  * Expand a ~user
 376                  */
 377                 if ((pwd = k_getpwnam((char*) patbuf)) == NULL)
 378                         return pattern;
 379                 else
 380                         h = pwd->pw_dir;
 381         }
 382
 383         /* Copy the home directory */
 384         for (b = patbuf; *h; *b++ = *h++)
 385                 continue;
 386
 387         /* Append the rest of the pattern */
 388         while ((*b++ = *p++) != CHAR_EOS)
 389                 continue;
 390
 391         return patbuf;
 392 }
 393
 394
 395 /*
 396  * The main glob() routine: compiles the pattern (optionally processing
 397  * quotes), calls glob1() to do the real pattern matching, and finally
 398  * sorts the list (unless unsorted operation is requested).  Returns 0
 399  * if things went well, nonzero if errors occurred.  It is not an error
 400  * to find no matches.
 401  */
 402 static int
 403 glob0(const Char *pattern, glob_t *pglob)
 404 {
 405         const Char *qpatnext;
 406         int c, err, oldpathc;
 407         Char *bufnext, patbuf[MaxPathLen+1];
 408
 409         qpatnext = globtilde(pattern, patbuf, pglob);
 410         oldpathc = pglob->gl_pathc;
 411         bufnext = patbuf;
 412
 413         /* We don't need to check for buffer overflow any more. */
 414         while ((c = *qpatnext++) != CHAR_EOS) {
 415                 switch (c) {
 416                 case CHAR_LBRACKET:
 417                         c = *qpatnext;
 418                         if (c == CHAR_NOT)
 419                                 ++qpatnext;
 420                         if (*qpatnext == CHAR_EOS ||
 421                             g_strchr((Char *) qpatnext+1, CHAR_RBRACKET) == NULL) {
 422                                 *bufnext++ = CHAR_LBRACKET;
 423                                 if (c == CHAR_NOT)
 424                                         --qpatnext;
 425                                 break;
 426                         }
 427                         *bufnext++ = M_SET;
 428                         if (c == CHAR_NOT)
 429                                 *bufnext++ = M_NOT;
 430                         c = *qpatnext++;
 431                         do {
 432                                 *bufnext++ = CHAR(c);
 433                                 if (*qpatnext == CHAR_RANGE &&
 434                                     (c = qpatnext[1]) != CHAR_RBRACKET) {
 435                                         *bufnext++ = M_RNG;
 436                                         *bufnext++ = CHAR(c);
 437                                         qpatnext += 2;
 438                                 }
 439                         } while ((c = *qpatnext++) != CHAR_RBRACKET);
 440                         pglob->gl_flags |= GLOB_MAGCHAR;
 441                         *bufnext++ = M_END;
 442                         break;
 443                 case CHAR_QUESTION:
 444                         pglob->gl_flags |= GLOB_MAGCHAR;
 445                         *bufnext++ = M_ONE;
 446                         break;
 447                 case CHAR_STAR:
 448                         pglob->gl_flags |= GLOB_MAGCHAR;
 449                         /* collapse adjacent stars to one,
 450                          * to avoid exponential behavior
 451                          */
 452                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 453                             *bufnext++ = M_ALL;
 454                         break;
 455                 default:
 456                         *bufnext++ = CHAR(c);
 457                         break;
 458                 }
 459         }
 460         *bufnext = CHAR_EOS;
 461 #ifdef DEBUG
 462         qprintf("glob0:", patbuf);
 463 #endif
 464
 465         if ((err = glob1(patbuf, pglob)) != 0)
 466                 return(err);
 467
 468         /*
 469          * If there was no match we are going to append the pattern
 470          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 471          * and the pattern did not contain any magic characters
 472          * GLOB_NOMAGIC is there just for compatibility with csh.
 473          */
 474         if (pglob->gl_pathc == oldpathc &&
 475             ((pglob->gl_flags & GLOB_NOCHECK) ||
 476               ((pglob->gl_flags & GLOB_NOMAGIC) &&
 477                !(pglob->gl_flags & GLOB_MAGCHAR))))
 478                 return(globextend(pattern, pglob));
 479         else if (!(pglob->gl_flags & GLOB_NOSORT))
 480                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 481                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 482         return(0);
 483 }
 484
 485 static int
 486 compare(const void *p, const void *q)
 487 {
 488         return(strcmp(*(char **)p, *(char **)q));
 489 }
 490
 491 static int
 492 glob1(Char *pattern, glob_t *pglob)
 493 {
 494         Char pathbuf[MaxPathLen+1];
 495
 496         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 497         if (*pattern == CHAR_EOS)
 498                 return(0);
 499         return(glob2(pathbuf, pathbuf, pattern, pglob));
 500 }
 501
 502 /*
 503  * The functions glob2 and glob3 are mutually recursive; there is one level
 504  * of recursion for each segment in the pattern that contains one or more
 505  * meta characters.
 506  */
 507
 508 #ifndef S_ISLNK
 509 #if defined(S_IFLNK) && defined(S_IFMT)
 510 #define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)
 511 #else
 512 #define S_ISLNK(mode) 0
 513 #endif
 514 #endif
 515
 516 static int
 517 glob2(Char *pathbuf, Char *pathend, Char *pattern, glob_t *pglob)
 518 {
 519         struct stat sb;
 520         Char *p, *q;
 521         int anymeta;
 522
 523         /*
 524          * Loop over pattern segments until end of pattern or until
 525          * segment with meta character found.
 526          */
 527         for (anymeta = 0;;) {
 528                 if (*pattern == CHAR_EOS) {             /* End of pattern? */
 529                         *pathend = CHAR_EOS;
 530                         if (g_lstat(pathbuf, &sb, pglob))
 531                                 return(0);
 532
 533                         if (((pglob->gl_flags & GLOB_MARK) &&
 534                             pathend[-1] != CHAR_SEP) && (S_ISDIR(sb.st_mode)
 535                             || (S_ISLNK(sb.st_mode) &&
 536                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 537                             S_ISDIR(sb.st_mode)))) {
 538                                 *pathend++ = CHAR_SEP;
 539                                 *pathend = CHAR_EOS;
 540                         }
 541                         ++pglob->gl_matchc;
 542                         return(globextend(pathbuf, pglob));
 543                 }
 544
 545                 /* Find end of next segment, copy tentatively to pathend. */
 546                 q = pathend;
 547                 p = pattern;
 548                 while (*p != CHAR_EOS && *p != CHAR_SEP) {
 549                         if (ismeta(*p))
 550                                 anymeta = 1;
 551                         *q++ = *p++;
 552                 }
 553
 554                 if (!anymeta) {         /* No expansion, do next segment. */
 555                         pathend = q;
 556                         pattern = p;
 557                         while (*pattern == CHAR_SEP)
 558                                 *pathend++ = *pattern++;
 559                 } else                  /* Need expansion, recurse. */
 560                         return(glob3(pathbuf, pathend, pattern, p, pglob));
 561         }
 562         /* CHAR_NOTREACHED */
 563 }
 564
 565 static int
 566 glob3(Char *pathbuf, Char *pathend, Char *pattern, Char *restpattern,
 567       glob_t *pglob)
 568 {
 569         struct dirent *dp;
 570         DIR *dirp;
 571         int err;
 572         char buf[MaxPathLen];
 573
 574         /*
 575          * The readdirfunc declaration can't be prototyped, because it is
 576          * assigned, below, to two functions which are prototyped in glob.h
 577          * and dirent.h as taking pointers to differently typed opaque
 578          * structures.
 579          */
 580         struct dirent *(*readdirfunc)(void *);
 581
 582         *pathend = CHAR_EOS;
 583         errno = 0;
 584
 585         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 586                 /* TODO: don't call for ENOENT or ENOTDIR? */
 587                 if (pglob->gl_errfunc) {
 588                         g_Ctoc(pathbuf, buf);
 589                         if (pglob->gl_errfunc(buf, errno) ||
 590                             pglob->gl_flags & GLOB_ERR)
 591                                 return (GLOB_ABEND);
 592                 }
 593                 return(0);
 594         }
 595
 596         err = 0;
 597
 598         /* Search directory for matching names. */
 599         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 600                 readdirfunc = pglob->gl_readdir;
 601         else
 602                 readdirfunc = (struct dirent *(*)(void *))readdir;
 603         while ((dp = (*readdirfunc)(dirp))) {
 604                 u_char *sc;
 605                 Char *dc;
 606
 607                 /* Initial CHAR_DOT must be matched literally. */
 608                 if (dp->d_name[0] == CHAR_DOT && *pattern != CHAR_DOT)
 609                         continue;
 610                 for (sc = (u_char *) dp->d_name, dc = pathend;
 611                      (*dc++ = *sc++) != CHAR_EOS;)
 612                         continue;
 613                 if (!match(pathend, pattern, restpattern)) {
 614                         *pathend = CHAR_EOS;
 615                         continue;
 616                 }
 617                 err = glob2(pathbuf, --dc, restpattern, pglob);
 618                 if (err)
 619                         break;
 620         }
 621
 622         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 623                 (*pglob->gl_closedir)(dirp);
 624         else
 625                 closedir(dirp);
 626         return(err);
 627 }
 628
 629
 630 /*
 631  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 632  * add the new item, and update gl_pathc.
 633  *
 634  * This assumes the BSD realloc, which only copies the block when its size
 635  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 636  * behavior.
 637  *
 638  * Return 0 if new item added, error code if memory couldn't be allocated.
 639  *
 640  * Invariant of the glob_t structure:
 641  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 642  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 643  */
 644 static int
 645 globextend(const Char *path, glob_t *pglob)
 646 {
 647         char **pathv;
 648         int i;
 649         u_int newsize;
 650         char *copy;
 651         const Char *p;
 652
 653         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 654         pathv = pglob->gl_pathv ?
 655                     realloc(pglob->gl_pathv, newsize) :
 656                     malloc(newsize);
 657         if (pathv == NULL)
 658                 return(GLOB_NOSPACE);
 659
 660         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 661                 /* first time around -- clear initial gl_offs items */
 662                 pathv += pglob->gl_offs;
 663                 for (i = pglob->gl_offs; --i >= 0; )
 664                         *--pathv = NULL;
 665         }
 666         pglob->gl_pathv = pathv;
 667
 668         for (p = path; *p++;)
 669                 continue;
 670         if ((copy = malloc(p - path)) != NULL) {
 671                 g_Ctoc(path, copy);
 672                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 673         }
 674         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 675         return(copy == NULL ? GLOB_NOSPACE : 0);
 676 }
 677
 678
 679 /*
 680  * pattern matching function for filenames.  Each occurrence of the *
 681  * pattern causes a recursion level.
 682  */
 683 static int
 684 match(Char *name, Char *pat, Char *patend)
 685 {
 686         int ok, negate_range;
 687         Char c, k;
 688
 689         while (pat < patend) {
 690                 c = *pat++;
 691                 switch (c & M_MASK) {
 692                 case M_ALL:
 693                         if (pat == patend)
 694                                 return(1);
 695                         do
 696                             if (match(name, pat, patend))
 697                                     return(1);
 698                         while (*name++ != CHAR_EOS);
 699                         return(0);
 700                 case M_ONE:
 701                         if (*name++ == CHAR_EOS)
 702                                 return(0);
 703                         break;
 704                 case M_SET:
 705                         ok = 0;
 706                         if ((k = *name++) == CHAR_EOS)
 707                                 return(0);
 708                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != CHAR_EOS)
 709                                 ++pat;
 710                         while (((c = *pat++) & M_MASK) != M_END)
 711                                 if ((*pat & M_MASK) == M_RNG) {
 712                                         if (c <= k && k <= pat[1])
 713                                                 ok = 1;
 714                                         pat += 2;
 715                                 } else if (c == k)
 716                                         ok = 1;
 717                         if (ok == negate_range)
 718                                 return(0);
 719                         break;
 720                 default:
 721                         if (*name++ != c)
 722                                 return(0);
 723                         break;
 724                 }
 725         }
 726         return(*name == CHAR_EOS);
 727 }
 728
 729 /* Free allocated data belonging to a glob_t structure. */
 730 void
 731 globfree(glob_t *pglob)
 732 {
 733         int i;
 734         char **pp;
 735
 736         if (pglob->gl_pathv != NULL) {
 737                 pp = pglob->gl_pathv + pglob->gl_offs;
 738                 for (i = pglob->gl_pathc; i--; ++pp)
 739                         if (*pp)
 740                                 free(*pp);
 741                 free(pglob->gl_pathv);
 742         }
 743 }
 744
 745 static DIR *
 746 g_opendir(Char *str, glob_t *pglob)
 747 {
 748         char buf[MaxPathLen];
 749
 750         if (!*str)
 751                 strcpy_truncate(buf, ".", sizeof(buf));
 752         else
 753                 g_Ctoc(str, buf);
 754
 755         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 756                 return((*pglob->gl_opendir)(buf));
 757
 758         return(opendir(buf));
 759 }
 760
 761 static int
 762 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
 763 {
 764         char buf[MaxPathLen];
 765
 766         g_Ctoc(fn, buf);
 767         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 768                 return((*pglob->gl_lstat)(buf, sb));
 769         return(lstat(buf, sb));
 770 }
 771
 772 static int
 773 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
 774 {
 775         char buf[MaxPathLen];
 776
 777         g_Ctoc(fn, buf);
 778         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 779                 return((*pglob->gl_stat)(buf, sb));
 780         return(stat(buf, sb));
 781 }
 782
 783 static Char *
 784 g_strchr(Char *str, int ch)
 785 {
 786         do {
 787                 if (*str == ch)
 788                         return (str);
 789         } while (*str++);
 790         return (NULL);
 791 }
 792
 793 #ifdef notdef
 794 static Char *
 795 g_strcat(Char *dst, const Char *src)
 796 {
 797         Char *sdst = dst;
 798
 799         while (*dst++)
 800                 continue;
 801         --dst;
 802         while((*dst++ = *src++) != CHAR_EOS)
 803             continue;
 804
 805         return (sdst);
 806 }
 807 #endif
 808
 809 static void
 810 g_Ctoc(const Char *str, char *buf)
 811 {
 812         char *dc;
 813
 814         for (dc = buf; (*dc++ = *str++) != CHAR_EOS;)
 815                 continue;
 816 }
 817
 818 #ifdef DEBUG
 819 static void
 820 qprintf(const Char *str, Char *s)
 821 {
 822         Char *p;
 823
 824         printf("%s:\n", str);
 825         for (p = s; *p; p++)
 826                 printf("%c", CHAR(*p));
 827         printf("\n");
 828         for (p = s; *p; p++)
 829                 printf("%c", *p & M_PROTECT ? '"' : ' ');
 830         printf("\n");
 831         for (p = s; *p; p++)
 832                 printf("%c", ismeta(*p) ? '_' : ' ');
 833         printf("\n");
 834 }
 835 #endif