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. 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
  33 /*
  34  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  35  *
  36  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  37  *
  38  * Optional extra services, controlled by flags not defined by POSIX:
  39  *
  40  * GLOB_QUOTE:
  41  *      Escaping convention: \ inhibits any special meaning the following
  42  *      character might have (except \ at end of string is retained).
  43  * GLOB_MAGCHAR:
  44  *      Set in gl_flags if pattern contained a globbing character.
  45  * GLOB_NOMAGIC:
  46  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  47  *      not contain any magic characters.  [Used in csh style globbing]
  48  * GLOB_ALTDIRFUNC:
  49  *      Use alternately specified directory access functions.
  50  * GLOB_TILDE:
  51  *      expand ~user/foo to the /home/dir/of/user/foo
  52  * GLOB_BRACE:
  53  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  54  * gl_matchc:
  55  *      Number of matches in the current invocation of glob.
  56  */
  57
  58 #ifdef HAVE_CONFIG_H
  59 #include <config.h>
  60 #endif
  61
  62 #ifdef HAVE_SYS_PARAM_H
  63 #include <sys/param.h>
  64 #endif
  65 #ifdef HAVE_SYS_TYPES_H
  66 #include <sys/types.h>
  67 #endif
  68 #ifdef HAVE_SYS_STAT_H
  69 #include <sys/stat.h>
  70 #endif
  71
  72 #include <ctype.h>
  73 #ifdef HAVE_DIRENT_H
  74 #include <dirent.h>
  75 #endif
  76 #include <errno.h>
  77 #ifdef HAVE_PWD_H
  78 #include <pwd.h>
  79 #endif
  80 #include <stdio.h>
  81 #include <stdlib.h>
  82 #include <string.h>
  83 #ifdef HAVE_UNISTD_H
  84 #include <unistd.h>
  85 #endif
  86 #ifdef HAVE_LIMITS_H
  87 #include <limits.h>
  88 #endif
  89
  90 #include "glob.h"
  91 #include "roken.h"
  92
  93 #ifndef ARG_MAX
  94 #define ARG_MAX _POSIX_ARG_MAX
  95 #endif
  96
  97 #define CHAR_DOLLAR             '$'
  98 #define CHAR_DOT                '.'
  99 #define CHAR_EOS                '\0'
 100 #define CHAR_LBRACKET           '['
 101 #define CHAR_NOT                '!'
 102 #define CHAR_QUESTION           '?'
 103 #define CHAR_QUOTE              '\\'
 104 #define CHAR_RANGE              '-'
 105 #define CHAR_RBRACKET           ']'
 106 #define CHAR_SEP                '/'
 107 #define CHAR_STAR               '*'
 108 #define CHAR_TILDE              '~'
 109 #define CHAR_UNDERSCORE         '_'
 110 #define CHAR_LBRACE             '{'
 111 #define CHAR_RBRACE             '}'
 112 #define CHAR_SLASH              '/'
 113 #define CHAR_COMMA              ','
 114
 115 #ifndef DEBUG
 116
 117 #define M_QUOTE         0x8000
 118 #define M_PROTECT       0x4000
 119 #define M_MASK          0xffff
 120 #define M_ASCII         0x00ff
 121
 122 typedef u_short Char;
 123
 124 #else
 125
 126 #define M_QUOTE         0x80
 127 #define M_PROTECT       0x40
 128 #define M_MASK          0xff
 129 #define M_ASCII         0x7f
 130
 131 typedef char Char;
 132
 133 #endif
 134
 135
 136 #define CHAR(c)         ((Char)((c)&M_ASCII))
 137 #define META(c)         ((Char)((c)|M_QUOTE))
 138 #define M_ALL           META('*')
 139 #define M_END           META(']')
 140 #define M_NOT           META('!')
 141 #define M_ONE           META('?')
 142 #define M_RNG           META('-')
 143 #define M_SET           META('[')
 144 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 145
 146
 147 static int       compare (const void *, const void *);
 148 static void      g_Ctoc (const Char *, char *);
 149 static int       g_lstat (Char *, struct stat *, glob_t *);
 150 static DIR      *g_opendir (Char *, glob_t *);
 151 static Char     *g_strchr (const Char *, int);
 152 #ifdef notdef
 153 static Char     *g_strcat (Char *, const Char *);
 154 #endif
 155 static int       g_stat (Char *, struct stat *, glob_t *);
 156 static int       glob0 (const Char *, glob_t *);
 157 static int       glob1 (Char *, glob_t *, size_t *);
 158 static int       glob2 (Char *, Char *, Char *, glob_t *, size_t *);
 159 static int       glob3 (Char *, Char *, Char *, Char *, glob_t *, size_t *);
 160 static int       globextend (const Char *, glob_t *, size_t *);
 161 static const Char *      globtilde (const Char *, Char *, glob_t *);
 162 static int       globexp1 (const Char *, glob_t *);
 163 static int       globexp2 (const Char *, const Char *, glob_t *, int *);
 164 static int       match (Char *, Char *, Char *);
 165 #ifdef DEBUG
 166 static void      qprintf (const char *, Char *);
 167 #endif
 168
 169 int ROKEN_LIB_FUNCTION
 170 glob(const char *pattern,
 171      int flags,
 172      int (*errfunc)(const char *, int),
 173      glob_t *pglob)
 174 {
 175         const u_char *patnext;
 176         int c;
 177         Char *bufnext, *bufend, patbuf[MaxPathLen+1];
 178
 179         patnext = (const u_char *) pattern;
 180         if (!(flags & GLOB_APPEND)) {
 181                 pglob->gl_pathc = 0;
 182                 pglob->gl_pathv = NULL;
 183                 if (!(flags & GLOB_DOOFFS))
 184                         pglob->gl_offs = 0;
 185         }
 186         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 187         pglob->gl_errfunc = errfunc;
 188         pglob->gl_matchc = 0;
 189
 190         bufnext = patbuf;
 191         bufend = bufnext + MaxPathLen;
 192         if (flags & GLOB_QUOTE) {
 193                 /* Protect the quoted characters. */
 194                 while (bufnext < bufend && (c = *patnext++) != CHAR_EOS)
 195                         if (c == CHAR_QUOTE) {
 196                                 if ((c = *patnext++) == CHAR_EOS) {
 197                                         c = CHAR_QUOTE;
 198                                         --patnext;
 199                                 }
 200                                 *bufnext++ = c | M_PROTECT;
 201                         }
 202                         else
 203                                 *bufnext++ = c;
 204         }
 205         else
 206             while (bufnext < bufend && (c = *patnext++) != CHAR_EOS)
 207                     *bufnext++ = c;
 208         *bufnext = CHAR_EOS;
 209
 210         if (flags & GLOB_BRACE)
 211             return globexp1(patbuf, pglob);
 212         else
 213             return glob0(patbuf, pglob);
 214 }
 215
 216 /*
 217  * Expand recursively a glob {} pattern. When there is no more expansion
 218  * invoke the standard globbing routine to glob the rest of the magic
 219  * characters
 220  */
 221 static int globexp1(const Char *pattern, glob_t *pglob)
 222 {
 223         const Char* ptr = pattern;
 224         int rv;
 225
 226         /* Protect a single {}, for find(1), like csh */
 227         if (pattern[0] == CHAR_LBRACE && pattern[1] == CHAR_RBRACE && pattern[2] == CHAR_EOS)
 228                 return glob0(pattern, pglob);
 229
 230         while ((ptr = (const Char *) g_strchr(ptr, CHAR_LBRACE)) != NULL)
 231                 if (!globexp2(ptr, pattern, pglob, &rv))
 232                         return rv;
 233
 234         return glob0(pattern, pglob);
 235 }
 236
 237
 238 /*
 239  * Recursive brace globbing helper. Tries to expand a single brace.
 240  * If it succeeds then it invokes globexp1 with the new pattern.
 241  * If it fails then it tries to glob the rest of the pattern and returns.
 242  */
 243 static int globexp2(const Char *ptr, const Char *pattern,
 244                     glob_t *pglob, int *rv)
 245 {
 246         int     i;
 247         Char   *lm, *ls;
 248         const Char *pe, *pm, *pl;
 249         Char    patbuf[MaxPathLen + 1];
 250
 251         /* copy part up to the brace */
 252         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 253                 continue;
 254         ls = lm;
 255
 256         /* Find the balanced brace */
 257         for (i = 0, pe = ++ptr; *pe; pe++)
 258                 if (*pe == CHAR_LBRACKET) {
 259                         /* Ignore everything between [] */
 260                         for (pm = pe++; *pe != CHAR_RBRACKET && *pe != CHAR_EOS; pe++)
 261                                 continue;
 262                         if (*pe == CHAR_EOS) {
 263                                 /*
 264                                  * We could not find a matching CHAR_RBRACKET.
 265                                  * Ignore and just look for CHAR_RBRACE
 266                                  */
 267                                 pe = pm;
 268                         }
 269                 }
 270                 else if (*pe == CHAR_LBRACE)
 271                         i++;
 272                 else if (*pe == CHAR_RBRACE) {
 273                         if (i == 0)
 274                                 break;
 275                         i--;
 276                 }
 277
 278         /* Non matching braces; just glob the pattern */
 279         if (i != 0 || *pe == CHAR_EOS) {
 280                 *rv = glob0(patbuf, pglob);
 281                 return 0;
 282         }
 283
 284         for (i = 0, pl = pm = ptr; pm <= pe; pm++)
 285                 switch (*pm) {
 286                 case CHAR_LBRACKET:
 287                         /* Ignore everything between [] */
 288                         for (pl = pm++; *pm != CHAR_RBRACKET && *pm != CHAR_EOS; pm++)
 289                                 continue;
 290                         if (*pm == CHAR_EOS) {
 291                                 /*
 292                                  * We could not find a matching CHAR_RBRACKET.
 293                                  * Ignore and just look for CHAR_RBRACE
 294                                  */
 295                                 pm = pl;
 296                         }
 297                         break;
 298
 299                 case CHAR_LBRACE:
 300                         i++;
 301                         break;
 302
 303                 case CHAR_RBRACE:
 304                         if (i) {
 305                             i--;
 306                             break;
 307                         }
 308                         /* FALLTHROUGH */
 309                 case CHAR_COMMA:
 310                         if (i && *pm == CHAR_COMMA)
 311                                 break;
 312                         else {
 313                                 /* Append the current string */
 314                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 315                                         continue;
 316                                 /*
 317                                  * Append the rest of the pattern after the
 318                                  * closing brace
 319                                  */
 320                                 for (pl = pe + 1; (*lm++ = *pl++) != CHAR_EOS;)
 321                                         continue;
 322
 323                                 /* Expand the current pattern */
 324 #ifdef DEBUG
 325                                 qprintf("globexp2:", patbuf);
 326 #endif
 327                                 *rv = globexp1(patbuf, pglob);
 328
 329                                 /* move after the comma, to the next string */
 330                                 pl = pm + 1;
 331                         }
 332                         break;
 333
 334                 default:
 335                         break;
 336                 }
 337         *rv = 0;
 338         return 0;
 339 }
 340
 341
 342
 343 /*
 344  * expand tilde from the passwd file.
 345  */
 346 static const Char *
 347 globtilde(const Char *pattern, Char *patbuf, glob_t *pglob)
 348 {
 349         struct passwd *pwd;
 350         char *h;
 351         const Char *p;
 352         Char *b;
 353
 354         if (*pattern != CHAR_TILDE || !(pglob->gl_flags & GLOB_TILDE))
 355                 return pattern;
 356
 357         /* Copy up to the end of the string or / */
 358         for (p = pattern + 1, h = (char *) patbuf; *p && *p != CHAR_SLASH;
 359              *h++ = *p++)
 360                 continue;
 361
 362         *h = CHAR_EOS;
 363
 364         if (((char *) patbuf)[0] == CHAR_EOS) {
 365                 /*
 366                  * handle a plain ~ or ~/ by expanding $HOME
 367                  * first and then trying the password file
 368                  */
 369                 if ((h = getenv("HOME")) == NULL) {
 370                         if ((pwd = k_getpwuid(getuid())) == NULL)
 371                                 return pattern;
 372                         else
 373                                 h = pwd->pw_dir;
 374                 }
 375         }
 376         else {
 377                 /*
 378                  * Expand a ~user
 379                  */
 380                 if ((pwd = k_getpwnam((char*) patbuf)) == NULL)
 381                         return pattern;
 382                 else
 383                         h = pwd->pw_dir;
 384         }
 385
 386         /* Copy the home directory */
 387         for (b = patbuf; *h; *b++ = *h++)
 388                 continue;
 389
 390         /* Append the rest of the pattern */
 391         while ((*b++ = *p++) != CHAR_EOS)
 392                 continue;
 393
 394         return patbuf;
 395 }
 396
 397
 398 /*
 399  * The main glob() routine: compiles the pattern (optionally processing
 400  * quotes), calls glob1() to do the real pattern matching, and finally
 401  * sorts the list (unless unsorted operation is requested).  Returns 0
 402  * if things went well, nonzero if errors occurred.  It is not an error
 403  * to find no matches.
 404  */
 405 static int
 406 glob0(const Char *pattern, glob_t *pglob)
 407 {
 408         const Char *qpatnext;
 409         int c, err, oldpathc;
 410         Char *bufnext, patbuf[MaxPathLen+1];
 411         size_t limit = 0;
 412
 413         qpatnext = globtilde(pattern, patbuf, pglob);
 414         oldpathc = pglob->gl_pathc;
 415         bufnext = patbuf;
 416
 417         /* We don't need to check for buffer overflow any more. */
 418         while ((c = *qpatnext++) != CHAR_EOS) {
 419                 switch (c) {
 420                 case CHAR_LBRACKET:
 421                         c = *qpatnext;
 422                         if (c == CHAR_NOT)
 423                                 ++qpatnext;
 424                         if (*qpatnext == CHAR_EOS ||
 425                             g_strchr(qpatnext+1, CHAR_RBRACKET) == NULL) {
 426                                 *bufnext++ = CHAR_LBRACKET;
 427                                 if (c == CHAR_NOT)
 428                                         --qpatnext;
 429                                 break;
 430                         }
 431                         *bufnext++ = M_SET;
 432                         if (c == CHAR_NOT)
 433                                 *bufnext++ = M_NOT;
 434                         c = *qpatnext++;
 435                         do {
 436                                 *bufnext++ = CHAR(c);
 437                                 if (*qpatnext == CHAR_RANGE &&
 438                                     (c = qpatnext[1]) != CHAR_RBRACKET) {
 439                                         *bufnext++ = M_RNG;
 440                                         *bufnext++ = CHAR(c);
 441                                         qpatnext += 2;
 442                                 }
 443                         } while ((c = *qpatnext++) != CHAR_RBRACKET);
 444                         pglob->gl_flags |= GLOB_MAGCHAR;
 445                         *bufnext++ = M_END;
 446                         break;
 447                 case CHAR_QUESTION:
 448                         pglob->gl_flags |= GLOB_MAGCHAR;
 449                         *bufnext++ = M_ONE;
 450                         break;
 451                 case CHAR_STAR:
 452                         pglob->gl_flags |= GLOB_MAGCHAR;
 453                         /* collapse adjacent stars to one,
 454                          * to avoid exponential behavior
 455                          */
 456                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 457                             *bufnext++ = M_ALL;
 458                         break;
 459                 default:
 460                         *bufnext++ = CHAR(c);
 461                         break;
 462                 }
 463         }
 464         *bufnext = CHAR_EOS;
 465 #ifdef DEBUG
 466         qprintf("glob0:", patbuf);
 467 #endif
 468
 469         if ((err = glob1(patbuf, pglob, &limit)) != 0)
 470                 return(err);
 471
 472         /*
 473          * If there was no match we are going to append the pattern
 474          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 475          * and the pattern did not contain any magic characters
 476          * GLOB_NOMAGIC is there just for compatibility with csh.
 477          */
 478         if (pglob->gl_pathc == oldpathc &&
 479             ((pglob->gl_flags & GLOB_NOCHECK) ||
 480               ((pglob->gl_flags & GLOB_NOMAGIC) &&
 481                !(pglob->gl_flags & GLOB_MAGCHAR))))
 482                 return(globextend(pattern, pglob, &limit));
 483         else if (!(pglob->gl_flags & GLOB_NOSORT))
 484                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 485                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 486         return(0);
 487 }
 488
 489 static int
 490 compare(const void *p, const void *q)
 491 {
 492         return(strcmp(*(char **)p, *(char **)q));
 493 }
 494
 495 static int
 496 glob1(Char *pattern, glob_t *pglob, size_t *limit)
 497 {
 498         Char pathbuf[MaxPathLen+1];
 499
 500         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 501         if (*pattern == CHAR_EOS)
 502                 return(0);
 503         return(glob2(pathbuf, pathbuf, pattern, pglob, limit));
 504 }
 505
 506 /*
 507  * The functions glob2 and glob3 are mutually recursive; there is one level
 508  * of recursion for each segment in the pattern that contains one or more
 509  * meta characters.
 510  */
 511
 512 #ifndef S_ISLNK
 513 #if defined(S_IFLNK) && defined(S_IFMT)
 514 #define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)
 515 #else
 516 #define S_ISLNK(mode) 0
 517 #endif
 518 #endif
 519
 520 static int
 521 glob2(Char *pathbuf, Char *pathend, Char *pattern, glob_t *pglob,
 522       size_t *limit)
 523 {
 524         struct stat sb;
 525         Char *p, *q;
 526         int anymeta;
 527
 528         /*
 529          * Loop over pattern segments until end of pattern or until
 530          * segment with meta character found.
 531          */
 532         for (anymeta = 0;;) {
 533                 if (*pattern == CHAR_EOS) {             /* End of pattern? */
 534                         *pathend = CHAR_EOS;
 535                         if (g_lstat(pathbuf, &sb, pglob))
 536                                 return(0);
 537
 538                         if (((pglob->gl_flags & GLOB_MARK) &&
 539                             pathend[-1] != CHAR_SEP) && (S_ISDIR(sb.st_mode)
 540                             || (S_ISLNK(sb.st_mode) &&
 541                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 542                             S_ISDIR(sb.st_mode)))) {
 543                                 *pathend++ = CHAR_SEP;
 544                                 *pathend = CHAR_EOS;
 545                         }
 546                         ++pglob->gl_matchc;
 547                         return(globextend(pathbuf, pglob, limit));
 548                 }
 549
 550                 /* Find end of next segment, copy tentatively to pathend. */
 551                 q = pathend;
 552                 p = pattern;
 553                 while (*p != CHAR_EOS && *p != CHAR_SEP) {
 554                         if (ismeta(*p))
 555                                 anymeta = 1;
 556                         *q++ = *p++;
 557                 }
 558
 559                 if (!anymeta) {         /* No expansion, do next segment. */
 560                         pathend = q;
 561                         pattern = p;
 562                         while (*pattern == CHAR_SEP)
 563                                 *pathend++ = *pattern++;
 564                 } else                  /* Need expansion, recurse. */
 565                         return(glob3(pathbuf, pathend, pattern, p, pglob,
 566                             limit));
 567         }
 568         /* NOTREACHED */
 569 }
 570
 571 static int
 572 glob3(Char *pathbuf, Char *pathend, Char *pattern, Char *restpattern,
 573       glob_t *pglob, size_t *limit)
 574 {
 575         struct dirent *dp;
 576         DIR *dirp;
 577         int err;
 578         char buf[MaxPathLen];
 579
 580         /*
 581          * The readdirfunc declaration can't be prototyped, because it is
 582          * assigned, below, to two functions which are prototyped in glob.h
 583          * and dirent.h as taking pointers to differently typed opaque
 584          * structures.
 585          */
 586         struct dirent *(*readdirfunc)(void *);
 587
 588         *pathend = CHAR_EOS;
 589         errno = 0;
 590
 591         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 592                 /* TODO: don't call for ENOENT or ENOTDIR? */
 593                 if (pglob->gl_errfunc) {
 594                         g_Ctoc(pathbuf, buf);
 595                         if (pglob->gl_errfunc(buf, errno) ||
 596                             pglob->gl_flags & GLOB_ERR)
 597                                 return (GLOB_ABEND);
 598                 }
 599                 return(0);
 600         }
 601
 602         err = 0;
 603
 604         /* Search directory for matching names. */
 605         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 606                 readdirfunc = pglob->gl_readdir;
 607         else
 608                 readdirfunc = (struct dirent *(*)(void *))readdir;
 609         while ((dp = (*readdirfunc)(dirp))) {
 610                 u_char *sc;
 611                 Char *dc;
 612
 613                 /* Initial CHAR_DOT must be matched literally. */
 614                 if (dp->d_name[0] == CHAR_DOT && *pattern != CHAR_DOT)
 615                         continue;
 616                 for (sc = (u_char *) dp->d_name, dc = pathend;
 617                      (*dc++ = *sc++) != CHAR_EOS;)
 618                         continue;
 619                 if (!match(pathend, pattern, restpattern)) {
 620                         *pathend = CHAR_EOS;
 621                         continue;
 622                 }
 623                 err = glob2(pathbuf, --dc, restpattern, pglob, limit);
 624                 if (err)
 625                         break;
 626         }
 627
 628         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 629                 (*pglob->gl_closedir)(dirp);
 630         else
 631                 closedir(dirp);
 632         return(err);
 633 }
 634
 635
 636 /*
 637  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 638  * add the new item, and update gl_pathc.
 639  *
 640  * This assumes the BSD realloc, which only copies the block when its size
 641  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 642  * behavior.
 643  *
 644  * Return 0 if new item added, error code if memory couldn't be allocated.
 645  *
 646  * Invariant of the glob_t structure:
 647  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 648  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 649  */
 650 static int
 651 globextend(const Char *path, glob_t *pglob, size_t *limit)
 652 {
 653         char **pathv;
 654         int i;
 655         size_t newsize, len;
 656         char *copy;
 657         const Char *p;
 658
 659         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 660         pathv = pglob->gl_pathv ?
 661                     realloc(pglob->gl_pathv, newsize) :
 662                     malloc(newsize);
 663         if (pathv == NULL)
 664                 return(GLOB_NOSPACE);
 665
 666         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 667                 /* first time around -- clear initial gl_offs items */
 668                 pathv += pglob->gl_offs;
 669                 for (i = pglob->gl_offs; --i >= 0; )
 670                         *--pathv = NULL;
 671         }
 672         pglob->gl_pathv = pathv;
 673
 674         for (p = path; *p++;)
 675                 continue;
 676         len = (size_t)(p - path);
 677         *limit += len;
 678         if ((copy = malloc(len)) != NULL) {
 679                 g_Ctoc(path, copy);
 680                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 681         }
 682         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 683
 684         if ((pglob->gl_flags & GLOB_LIMIT) && (newsize + *limit) >= ARG_MAX) {
 685                 errno = 0;
 686                 return(GLOB_NOSPACE);
 687         }
 688
 689         return(copy == NULL ? GLOB_NOSPACE : 0);
 690 }
 691
 692
 693 /*
 694  * pattern matching function for filenames.  Each occurrence of the *
 695  * pattern causes a recursion level.
 696  */
 697 static int
 698 match(Char *name, Char *pat, Char *patend)
 699 {
 700         int ok, negate_range;
 701         Char c, k;
 702
 703         while (pat < patend) {
 704                 c = *pat++;
 705                 switch (c & M_MASK) {
 706                 case M_ALL:
 707                         if (pat == patend)
 708                                 return(1);
 709                         do
 710                             if (match(name, pat, patend))
 711                                     return(1);
 712                         while (*name++ != CHAR_EOS);
 713                         return(0);
 714                 case M_ONE:
 715                         if (*name++ == CHAR_EOS)
 716                                 return(0);
 717                         break;
 718                 case M_SET:
 719                         ok = 0;
 720                         if ((k = *name++) == CHAR_EOS)
 721                                 return(0);
 722                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != CHAR_EOS)
 723                                 ++pat;
 724                         while (((c = *pat++) & M_MASK) != M_END)
 725                                 if ((*pat & M_MASK) == M_RNG) {
 726                                         if (c <= k && k <= pat[1])
 727                                                 ok = 1;
 728                                         pat += 2;
 729                                 } else if (c == k)
 730                                         ok = 1;
 731                         if (ok == negate_range)
 732                                 return(0);
 733                         break;
 734                 default:
 735                         if (*name++ != c)
 736                                 return(0);
 737                         break;
 738                 }
 739         }
 740         return(*name == CHAR_EOS);
 741 }
 742
 743 /* Free allocated data belonging to a glob_t structure. */
 744 void ROKEN_LIB_FUNCTION
 745 globfree(glob_t *pglob)
 746 {
 747         int i;
 748         char **pp;
 749
 750         if (pglob->gl_pathv != NULL) {
 751                 pp = pglob->gl_pathv + pglob->gl_offs;
 752                 for (i = pglob->gl_pathc; i--; ++pp)
 753                         if (*pp)
 754                                 free(*pp);
 755                 free(pglob->gl_pathv);
 756                 pglob->gl_pathv = NULL;
 757         }
 758 }
 759
 760 static DIR *
 761 g_opendir(Char *str, glob_t *pglob)
 762 {
 763         char buf[MaxPathLen];
 764
 765         if (!*str)
 766                 strlcpy(buf, ".", sizeof(buf));
 767         else
 768                 g_Ctoc(str, buf);
 769
 770         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 771                 return((*pglob->gl_opendir)(buf));
 772
 773         return(opendir(buf));
 774 }
 775
 776 static int
 777 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
 778 {
 779         char buf[MaxPathLen];
 780
 781         g_Ctoc(fn, buf);
 782         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 783                 return((*pglob->gl_lstat)(buf, sb));
 784         return(lstat(buf, sb));
 785 }
 786
 787 static int
 788 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
 789 {
 790         char buf[MaxPathLen];
 791
 792         g_Ctoc(fn, buf);
 793         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 794                 return((*pglob->gl_stat)(buf, sb));
 795         return(stat(buf, sb));
 796 }
 797
 798 static Char *
 799 g_strchr(const Char *str, int ch)
 800 {
 801         do {
 802                 if (*str == ch)
 803                         return (Char *)str;
 804         } while (*str++);
 805         return (NULL);
 806 }
 807
 808 #ifdef notdef
 809 static Char *
 810 g_strcat(Char *dst, const Char *src)
 811 {
 812         Char *sdst = dst;
 813
 814         while (*dst++)
 815                 continue;
 816         --dst;
 817         while((*dst++ = *src++) != CHAR_EOS)
 818             continue;
 819
 820         return (sdst);
 821 }
 822 #endif
 823
 824 static void
 825 g_Ctoc(const Char *str, char *buf)
 826 {
 827         char *dc;
 828
 829         for (dc = buf; (*dc++ = *str++) != CHAR_EOS;)
 830                 continue;
 831 }
 832
 833 #ifdef DEBUG
 834 static void
 835 qprintf(const Char *str, Char *s)
 836 {
 837         Char *p;
 838
 839         printf("%s:\n", str);
 840         for (p = s; *p; p++)
 841                 printf("%c", CHAR(*p));
 842         printf("\n");
 843         for (p = s; *p; p++)
 844                 printf("%c", *p & M_PROTECT ? '"' : ' ');
 845         printf("\n");
 846         for (p = s; *p; p++)
 847                 printf("%c", ismeta(*p) ? '_' : ' ');
 848         printf("\n");
 849 }
 850 #endif