crypto/heimdal-0.6.3/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 #ifdef HAVE_LIMITS_H
  91 #include <limits.h>
  92 #endif
  93
  94 #include "glob.h"
  95 #include "roken.h"
  96
  97 #ifndef ARG_MAX
  98 #define ARG_MAX _POSIX_ARG_MAX
  99 #endif
 100
 101 #define CHAR_DOLLAR             '$'
 102 #define CHAR_DOT                '.'
 103 #define CHAR_EOS                '\0'
 104 #define CHAR_LBRACKET           '['
 105 #define CHAR_NOT                '!'
 106 #define CHAR_QUESTION           '?'
 107 #define CHAR_QUOTE              '\\'
 108 #define CHAR_RANGE              '-'
 109 #define CHAR_RBRACKET           ']'
 110 #define CHAR_SEP                '/'
 111 #define CHAR_STAR               '*'
 112 #define CHAR_TILDE              '~'
 113 #define CHAR_UNDERSCORE         '_'
 114 #define CHAR_LBRACE             '{'
 115 #define CHAR_RBRACE             '}'
 116 #define CHAR_SLASH              '/'
 117 #define CHAR_COMMA              ','
 118
 119 #ifndef DEBUG
 120
 121 #define M_QUOTE         0x8000
 122 #define M_PROTECT       0x4000
 123 #define M_MASK          0xffff
 124 #define M_ASCII         0x00ff
 125
 126 typedef u_short Char;
 127
 128 #else
 129
 130 #define M_QUOTE         0x80
 131 #define M_PROTECT       0x40
 132 #define M_MASK          0xff
 133 #define M_ASCII         0x7f
 134
 135 typedef char Char;
 136
 137 #endif
 138
 139
 140 #define CHAR(c)         ((Char)((c)&M_ASCII))
 141 #define META(c)         ((Char)((c)|M_QUOTE))
 142 #define M_ALL           META('*')
 143 #define M_END           META(']')
 144 #define M_NOT           META('!')
 145 #define M_ONE           META('?')
 146 #define M_RNG           META('-')
 147 #define M_SET           META('[')
 148 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 149
 150
 151 static int       compare (const void *, const void *);
 152 static void      g_Ctoc (const Char *, char *);
 153 static int       g_lstat (Char *, struct stat *, glob_t *);
 154 static DIR      *g_opendir (Char *, glob_t *);
 155 static Char     *g_strchr (const Char *, int);
 156 #ifdef notdef
 157 static Char     *g_strcat (Char *, const Char *);
 158 #endif
 159 static int       g_stat (Char *, struct stat *, glob_t *);
 160 static int       glob0 (const Char *, glob_t *);
 161 static int       glob1 (Char *, glob_t *, size_t *);
 162 static int       glob2 (Char *, Char *, Char *, glob_t *, size_t *);
 163 static int       glob3 (Char *, Char *, Char *, Char *, glob_t *, size_t *);
 164 static int       globextend (const Char *, glob_t *, size_t *);
 165 static const Char *      globtilde (const Char *, Char *, glob_t *);
 166 static int       globexp1 (const Char *, glob_t *);
 167 static int       globexp2 (const Char *, const Char *, glob_t *, int *);
 168 static int       match (Char *, Char *, Char *);
 169 #ifdef DEBUG
 170 static void      qprintf (const char *, Char *);
 171 #endif
 172
 173 int
 174 glob(const char *pattern,
 175      int flags,
 176      int (*errfunc)(const char *, int),
 177      glob_t *pglob)
 178 {
 179         const u_char *patnext;
 180         int c;
 181         Char *bufnext, *bufend, patbuf[MaxPathLen+1];
 182
 183         patnext = (const u_char *) pattern;
 184         if (!(flags & GLOB_APPEND)) {
 185                 pglob->gl_pathc = 0;
 186                 pglob->gl_pathv = NULL;
 187                 if (!(flags & GLOB_DOOFFS))
 188                         pglob->gl_offs = 0;
 189         }
 190         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 191         pglob->gl_errfunc = errfunc;
 192         pglob->gl_matchc = 0;
 193
 194         bufnext = patbuf;
 195         bufend = bufnext + MaxPathLen;
 196         if (flags & GLOB_QUOTE) {
 197                 /* Protect the quoted characters. */
 198                 while (bufnext < bufend && (c = *patnext++) != CHAR_EOS)
 199                         if (c == CHAR_QUOTE) {
 200                                 if ((c = *patnext++) == CHAR_EOS) {
 201                                         c = CHAR_QUOTE;
 202                                         --patnext;
 203                                 }
 204                                 *bufnext++ = c | M_PROTECT;
 205                         }
 206                         else
 207                                 *bufnext++ = c;
 208         }
 209         else
 210             while (bufnext < bufend && (c = *patnext++) != CHAR_EOS)
 211                     *bufnext++ = c;
 212         *bufnext = CHAR_EOS;
 213
 214         if (flags & GLOB_BRACE)
 215             return globexp1(patbuf, pglob);
 216         else
 217             return glob0(patbuf, pglob);
 218 }
 219
 220 /*
 221  * Expand recursively a glob {} pattern. When there is no more expansion
 222  * invoke the standard globbing routine to glob the rest of the magic
 223  * characters
 224  */
 225 static int globexp1(const Char *pattern, glob_t *pglob)
 226 {
 227         const Char* ptr = pattern;
 228         int rv;
 229
 230         /* Protect a single {}, for find(1), like csh */
 231         if (pattern[0] == CHAR_LBRACE && pattern[1] == CHAR_RBRACE && pattern[2] == CHAR_EOS)
 232                 return glob0(pattern, pglob);
 233
 234         while ((ptr = (const Char *) g_strchr(ptr, CHAR_LBRACE)) != NULL)
 235                 if (!globexp2(ptr, pattern, pglob, &rv))
 236                         return rv;
 237
 238         return glob0(pattern, pglob);
 239 }
 240
 241
 242 /*
 243  * Recursive brace globbing helper. Tries to expand a single brace.
 244  * If it succeeds then it invokes globexp1 with the new pattern.
 245  * If it fails then it tries to glob the rest of the pattern and returns.
 246  */
 247 static int globexp2(const Char *ptr, const Char *pattern,
 248                     glob_t *pglob, int *rv)
 249 {
 250         int     i;
 251         Char   *lm, *ls;
 252         const Char *pe, *pm, *pl;
 253         Char    patbuf[MaxPathLen + 1];
 254
 255         /* copy part up to the brace */
 256         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 257                 continue;
 258         ls = lm;
 259
 260         /* Find the balanced brace */
 261         for (i = 0, pe = ++ptr; *pe; pe++)
 262                 if (*pe == CHAR_LBRACKET) {
 263                         /* Ignore everything between [] */
 264                         for (pm = pe++; *pe != CHAR_RBRACKET && *pe != CHAR_EOS; pe++)
 265                                 continue;
 266                         if (*pe == CHAR_EOS) {
 267                                 /*
 268                                  * We could not find a matching CHAR_RBRACKET.
 269                                  * Ignore and just look for CHAR_RBRACE
 270                                  */
 271                                 pe = pm;
 272                         }
 273                 }
 274                 else if (*pe == CHAR_LBRACE)
 275                         i++;
 276                 else if (*pe == CHAR_RBRACE) {
 277                         if (i == 0)
 278                                 break;
 279                         i--;
 280                 }
 281
 282         /* Non matching braces; just glob the pattern */
 283         if (i != 0 || *pe == CHAR_EOS) {
 284                 *rv = glob0(patbuf, pglob);
 285                 return 0;
 286         }
 287
 288         for (i = 0, pl = pm = ptr; pm <= pe; pm++)
 289                 switch (*pm) {
 290                 case CHAR_LBRACKET:
 291                         /* Ignore everything between [] */
 292                         for (pl = pm++; *pm != CHAR_RBRACKET && *pm != CHAR_EOS; pm++)
 293                                 continue;
 294                         if (*pm == CHAR_EOS) {
 295                                 /*
 296                                  * We could not find a matching CHAR_RBRACKET.
 297                                  * Ignore and just look for CHAR_RBRACE
 298                                  */
 299                                 pm = pl;
 300                         }
 301                         break;
 302
 303                 case CHAR_LBRACE:
 304                         i++;
 305                         break;
 306
 307                 case CHAR_RBRACE:
 308                         if (i) {
 309                             i--;
 310                             break;
 311                         }
 312                         /* FALLTHROUGH */
 313                 case CHAR_COMMA:
 314                         if (i && *pm == CHAR_COMMA)
 315                                 break;
 316                         else {
 317                                 /* Append the current string */
 318                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 319                                         continue;
 320                                 /*
 321                                  * Append the rest of the pattern after the
 322                                  * closing brace
 323                                  */
 324                                 for (pl = pe + 1; (*lm++ = *pl++) != CHAR_EOS;)
 325                                         continue;
 326
 327                                 /* Expand the current pattern */
 328 #ifdef DEBUG
 329                                 qprintf("globexp2:", patbuf);
 330 #endif
 331                                 *rv = globexp1(patbuf, pglob);
 332
 333                                 /* move after the comma, to the next string */
 334                                 pl = pm + 1;
 335                         }
 336                         break;
 337
 338                 default:
 339                         break;
 340                 }
 341         *rv = 0;
 342         return 0;
 343 }
 344
 345
 346
 347 /*
 348  * expand tilde from the passwd file.
 349  */
 350 static const Char *
 351 globtilde(const Char *pattern, Char *patbuf, glob_t *pglob)
 352 {
 353         struct passwd *pwd;
 354         char *h;
 355         const Char *p;
 356         Char *b;
 357
 358         if (*pattern != CHAR_TILDE || !(pglob->gl_flags & GLOB_TILDE))
 359                 return pattern;
 360
 361         /* Copy up to the end of the string or / */
 362         for (p = pattern + 1, h = (char *) patbuf; *p && *p != CHAR_SLASH;
 363              *h++ = *p++)
 364                 continue;
 365
 366         *h = CHAR_EOS;
 367
 368         if (((char *) patbuf)[0] == CHAR_EOS) {
 369                 /*
 370                  * handle a plain ~ or ~/ by expanding $HOME
 371                  * first and then trying the password file
 372                  */
 373                 if ((h = getenv("HOME")) == NULL) {
 374                         if ((pwd = k_getpwuid(getuid())) == NULL)
 375                                 return pattern;
 376                         else
 377                                 h = pwd->pw_dir;
 378                 }
 379         }
 380         else {
 381                 /*
 382                  * Expand a ~user
 383                  */
 384                 if ((pwd = k_getpwnam((char*) patbuf)) == NULL)
 385                         return pattern;
 386                 else
 387                         h = pwd->pw_dir;
 388         }
 389
 390         /* Copy the home directory */
 391         for (b = patbuf; *h; *b++ = *h++)
 392                 continue;
 393
 394         /* Append the rest of the pattern */
 395         while ((*b++ = *p++) != CHAR_EOS)
 396                 continue;
 397
 398         return patbuf;
 399 }
 400
 401
 402 /*
 403  * The main glob() routine: compiles the pattern (optionally processing
 404  * quotes), calls glob1() to do the real pattern matching, and finally
 405  * sorts the list (unless unsorted operation is requested).  Returns 0
 406  * if things went well, nonzero if errors occurred.  It is not an error
 407  * to find no matches.
 408  */
 409 static int
 410 glob0(const Char *pattern, glob_t *pglob)
 411 {
 412         const Char *qpatnext;
 413         int c, err, oldpathc;
 414         Char *bufnext, patbuf[MaxPathLen+1];
 415         size_t limit = 0;
 416
 417         qpatnext = globtilde(pattern, patbuf, pglob);
 418         oldpathc = pglob->gl_pathc;
 419         bufnext = patbuf;
 420
 421         /* We don't need to check for buffer overflow any more. */
 422         while ((c = *qpatnext++) != CHAR_EOS) {
 423                 switch (c) {
 424                 case CHAR_LBRACKET:
 425                         c = *qpatnext;
 426                         if (c == CHAR_NOT)
 427                                 ++qpatnext;
 428                         if (*qpatnext == CHAR_EOS ||
 429                             g_strchr(qpatnext+1, CHAR_RBRACKET) == NULL) {
 430                                 *bufnext++ = CHAR_LBRACKET;
 431                                 if (c == CHAR_NOT)
 432                                         --qpatnext;
 433                                 break;
 434                         }
 435                         *bufnext++ = M_SET;
 436                         if (c == CHAR_NOT)
 437                                 *bufnext++ = M_NOT;
 438                         c = *qpatnext++;
 439                         do {
 440                                 *bufnext++ = CHAR(c);
 441                                 if (*qpatnext == CHAR_RANGE &&
 442                                     (c = qpatnext[1]) != CHAR_RBRACKET) {
 443                                         *bufnext++ = M_RNG;
 444                                         *bufnext++ = CHAR(c);
 445                                         qpatnext += 2;
 446                                 }
 447                         } while ((c = *qpatnext++) != CHAR_RBRACKET);
 448                         pglob->gl_flags |= GLOB_MAGCHAR;
 449                         *bufnext++ = M_END;
 450                         break;
 451                 case CHAR_QUESTION:
 452                         pglob->gl_flags |= GLOB_MAGCHAR;
 453                         *bufnext++ = M_ONE;
 454                         break;
 455                 case CHAR_STAR:
 456                         pglob->gl_flags |= GLOB_MAGCHAR;
 457                         /* collapse adjacent stars to one,
 458                          * to avoid exponential behavior
 459                          */
 460                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 461                             *bufnext++ = M_ALL;
 462                         break;
 463                 default:
 464                         *bufnext++ = CHAR(c);
 465                         break;
 466                 }
 467         }
 468         *bufnext = CHAR_EOS;
 469 #ifdef DEBUG
 470         qprintf("glob0:", patbuf);
 471 #endif
 472
 473         if ((err = glob1(patbuf, pglob, &limit)) != 0)
 474                 return(err);
 475
 476         /*
 477          * If there was no match we are going to append the pattern
 478          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 479          * and the pattern did not contain any magic characters
 480          * GLOB_NOMAGIC is there just for compatibility with csh.
 481          */
 482         if (pglob->gl_pathc == oldpathc &&
 483             ((pglob->gl_flags & GLOB_NOCHECK) ||
 484               ((pglob->gl_flags & GLOB_NOMAGIC) &&
 485                !(pglob->gl_flags & GLOB_MAGCHAR))))
 486                 return(globextend(pattern, pglob, &limit));
 487         else if (!(pglob->gl_flags & GLOB_NOSORT))
 488                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 489                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 490         return(0);
 491 }
 492
 493 static int
 494 compare(const void *p, const void *q)
 495 {
 496         return(strcmp(*(char **)p, *(char **)q));
 497 }
 498
 499 static int
 500 glob1(Char *pattern, glob_t *pglob, size_t *limit)
 501 {
 502         Char pathbuf[MaxPathLen+1];
 503
 504         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 505         if (*pattern == CHAR_EOS)
 506                 return(0);
 507         return(glob2(pathbuf, pathbuf, pattern, pglob, limit));
 508 }
 509
 510 /*
 511  * The functions glob2 and glob3 are mutually recursive; there is one level
 512  * of recursion for each segment in the pattern that contains one or more
 513  * meta characters.
 514  */
 515
 516 #ifndef S_ISLNK
 517 #if defined(S_IFLNK) && defined(S_IFMT)
 518 #define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)
 519 #else
 520 #define S_ISLNK(mode) 0
 521 #endif
 522 #endif
 523
 524 static int
 525 glob2(Char *pathbuf, Char *pathend, Char *pattern, glob_t *pglob,
 526       size_t *limit)
 527 {
 528         struct stat sb;
 529         Char *p, *q;
 530         int anymeta;
 531
 532         /*
 533          * Loop over pattern segments until end of pattern or until
 534          * segment with meta character found.
 535          */
 536         for (anymeta = 0;;) {
 537                 if (*pattern == CHAR_EOS) {             /* End of pattern? */
 538                         *pathend = CHAR_EOS;
 539                         if (g_lstat(pathbuf, &sb, pglob))
 540                                 return(0);
 541
 542                         if (((pglob->gl_flags & GLOB_MARK) &&
 543                             pathend[-1] != CHAR_SEP) && (S_ISDIR(sb.st_mode)
 544                             || (S_ISLNK(sb.st_mode) &&
 545                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 546                             S_ISDIR(sb.st_mode)))) {
 547                                 *pathend++ = CHAR_SEP;
 548                                 *pathend = CHAR_EOS;
 549                         }
 550                         ++pglob->gl_matchc;
 551                         return(globextend(pathbuf, pglob, limit));
 552                 }
 553
 554                 /* Find end of next segment, copy tentatively to pathend. */
 555                 q = pathend;
 556                 p = pattern;
 557                 while (*p != CHAR_EOS && *p != CHAR_SEP) {
 558                         if (ismeta(*p))
 559                                 anymeta = 1;
 560                         *q++ = *p++;
 561                 }
 562
 563                 if (!anymeta) {         /* No expansion, do next segment. */
 564                         pathend = q;
 565                         pattern = p;
 566                         while (*pattern == CHAR_SEP)
 567                                 *pathend++ = *pattern++;
 568                 } else                  /* Need expansion, recurse. */
 569                         return(glob3(pathbuf, pathend, pattern, p, pglob,
 570                             limit));
 571         }
 572         /* NOTREACHED */
 573 }
 574
 575 static int
 576 glob3(Char *pathbuf, Char *pathend, Char *pattern, Char *restpattern,
 577       glob_t *pglob, size_t *limit)
 578 {
 579         struct dirent *dp;
 580         DIR *dirp;
 581         int err;
 582         char buf[MaxPathLen];
 583
 584         /*
 585          * The readdirfunc declaration can't be prototyped, because it is
 586          * assigned, below, to two functions which are prototyped in glob.h
 587          * and dirent.h as taking pointers to differently typed opaque
 588          * structures.
 589          */
 590         struct dirent *(*readdirfunc)(void *);
 591
 592         *pathend = CHAR_EOS;
 593         errno = 0;
 594
 595         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 596                 /* TODO: don't call for ENOENT or ENOTDIR? */
 597                 if (pglob->gl_errfunc) {
 598                         g_Ctoc(pathbuf, buf);
 599                         if (pglob->gl_errfunc(buf, errno) ||
 600                             pglob->gl_flags & GLOB_ERR)
 601                                 return (GLOB_ABEND);
 602                 }
 603                 return(0);
 604         }
 605
 606         err = 0;
 607
 608         /* Search directory for matching names. */
 609         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 610                 readdirfunc = pglob->gl_readdir;
 611         else
 612                 readdirfunc = (struct dirent *(*)(void *))readdir;
 613         while ((dp = (*readdirfunc)(dirp))) {
 614                 u_char *sc;
 615                 Char *dc;
 616
 617                 /* Initial CHAR_DOT must be matched literally. */
 618                 if (dp->d_name[0] == CHAR_DOT && *pattern != CHAR_DOT)
 619                         continue;
 620                 for (sc = (u_char *) dp->d_name, dc = pathend;
 621                      (*dc++ = *sc++) != CHAR_EOS;)
 622                         continue;
 623                 if (!match(pathend, pattern, restpattern)) {
 624                         *pathend = CHAR_EOS;
 625                         continue;
 626                 }
 627                 err = glob2(pathbuf, --dc, restpattern, pglob, limit);
 628                 if (err)
 629                         break;
 630         }
 631
 632         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 633                 (*pglob->gl_closedir)(dirp);
 634         else
 635                 closedir(dirp);
 636         return(err);
 637 }
 638
 639
 640 /*
 641  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 642  * add the new item, and update gl_pathc.
 643  *
 644  * This assumes the BSD realloc, which only copies the block when its size
 645  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 646  * behavior.
 647  *
 648  * Return 0 if new item added, error code if memory couldn't be allocated.
 649  *
 650  * Invariant of the glob_t structure:
 651  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 652  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 653  */
 654 static int
 655 globextend(const Char *path, glob_t *pglob, size_t *limit)
 656 {
 657         char **pathv;
 658         int i;
 659         size_t newsize, len;
 660         char *copy;
 661         const Char *p;
 662
 663         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 664         pathv = pglob->gl_pathv ?
 665                     realloc(pglob->gl_pathv, newsize) :
 666                     malloc(newsize);
 667         if (pathv == NULL)
 668                 return(GLOB_NOSPACE);
 669
 670         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 671                 /* first time around -- clear initial gl_offs items */
 672                 pathv += pglob->gl_offs;
 673                 for (i = pglob->gl_offs; --i >= 0; )
 674                         *--pathv = NULL;
 675         }
 676         pglob->gl_pathv = pathv;
 677
 678         for (p = path; *p++;)
 679                 continue;
 680         len = (size_t)(p - path);
 681         *limit += len;
 682         if ((copy = malloc(len)) != NULL) {
 683                 g_Ctoc(path, copy);
 684                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 685         }
 686         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 687
 688         if ((pglob->gl_flags & GLOB_LIMIT) && (newsize + *limit) >= ARG_MAX) {
 689                 errno = 0;
 690                 return(GLOB_NOSPACE);
 691         }
 692
 693         return(copy == NULL ? GLOB_NOSPACE : 0);
 694 }
 695
 696
 697 /*
 698  * pattern matching function for filenames.  Each occurrence of the *
 699  * pattern causes a recursion level.
 700  */
 701 static int
 702 match(Char *name, Char *pat, Char *patend)
 703 {
 704         int ok, negate_range;
 705         Char c, k;
 706
 707         while (pat < patend) {
 708                 c = *pat++;
 709                 switch (c & M_MASK) {
 710                 case M_ALL:
 711                         if (pat == patend)
 712                                 return(1);
 713                         do
 714                             if (match(name, pat, patend))
 715                                     return(1);
 716                         while (*name++ != CHAR_EOS);
 717                         return(0);
 718                 case M_ONE:
 719                         if (*name++ == CHAR_EOS)
 720                                 return(0);
 721                         break;
 722                 case M_SET:
 723                         ok = 0;
 724                         if ((k = *name++) == CHAR_EOS)
 725                                 return(0);
 726                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != CHAR_EOS)
 727                                 ++pat;
 728                         while (((c = *pat++) & M_MASK) != M_END)
 729                                 if ((*pat & M_MASK) == M_RNG) {
 730                                         if (c <= k && k <= pat[1])
 731                                                 ok = 1;
 732                                         pat += 2;
 733                                 } else if (c == k)
 734                                         ok = 1;
 735                         if (ok == negate_range)
 736                                 return(0);
 737                         break;
 738                 default:
 739                         if (*name++ != c)
 740                                 return(0);
 741                         break;
 742                 }
 743         }
 744         return(*name == CHAR_EOS);
 745 }
 746
 747 /* Free allocated data belonging to a glob_t structure. */
 748 void
 749 globfree(glob_t *pglob)
 750 {
 751         int i;
 752         char **pp;
 753
 754         if (pglob->gl_pathv != NULL) {
 755                 pp = pglob->gl_pathv + pglob->gl_offs;
 756                 for (i = pglob->gl_pathc; i--; ++pp)
 757                         if (*pp)
 758                                 free(*pp);
 759                 free(pglob->gl_pathv);
 760                 pglob->gl_pathv = NULL;
 761         }
 762 }
 763
 764 static DIR *
 765 g_opendir(Char *str, glob_t *pglob)
 766 {
 767         char buf[MaxPathLen];
 768
 769         if (!*str)
 770                 strlcpy(buf, ".", sizeof(buf));
 771         else
 772                 g_Ctoc(str, buf);
 773
 774         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 775                 return((*pglob->gl_opendir)(buf));
 776
 777         return(opendir(buf));
 778 }
 779
 780 static int
 781 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
 782 {
 783         char buf[MaxPathLen];
 784
 785         g_Ctoc(fn, buf);
 786         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 787                 return((*pglob->gl_lstat)(buf, sb));
 788         return(lstat(buf, sb));
 789 }
 790
 791 static int
 792 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
 793 {
 794         char buf[MaxPathLen];
 795
 796         g_Ctoc(fn, buf);
 797         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 798                 return((*pglob->gl_stat)(buf, sb));
 799         return(stat(buf, sb));
 800 }
 801
 802 static Char *
 803 g_strchr(const Char *str, int ch)
 804 {
 805         do {
 806                 if (*str == ch)
 807                         return (Char *)str;
 808         } while (*str++);
 809         return (NULL);
 810 }
 811
 812 #ifdef notdef
 813 static Char *
 814 g_strcat(Char *dst, const Char *src)
 815 {
 816         Char *sdst = dst;
 817
 818         while (*dst++)
 819                 continue;
 820         --dst;
 821         while((*dst++ = *src++) != CHAR_EOS)
 822             continue;
 823
 824         return (sdst);
 825 }
 826 #endif
 827
 828 static void
 829 g_Ctoc(const Char *str, char *buf)
 830 {
 831         char *dc;
 832
 833         for (dc = buf; (*dc++ = *str++) != CHAR_EOS;)
 834                 continue;
 835 }
 836
 837 #ifdef DEBUG
 838 static void
 839 qprintf(const Char *str, Char *s)
 840 {
 841         Char *p;
 842
 843         printf("%s:\n", str);
 844         for (p = s; *p; p++)
 845                 printf("%c", CHAR(*p));
 846         printf("\n");
 847         for (p = s; *p; p++)
 848                 printf("%c", *p & M_PROTECT ? '"' : ' ');
 849         printf("\n");
 850         for (p = s; *p; p++)
 851                 printf("%c", ismeta(*p) ? '_' : ' ');
 852         printf("\n");
 853 }
 854 #endif