granicus.if.org Git - imagemagick/blob - magick/utility.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %             U   U  TTTTT  IIIII  L      IIIII  TTTTT  Y   Y                 %
   7 %             U   U    T      I    L        I      T     Y Y                  %
   8 %             U   U    T      I    L        I      T      Y                   %
   9 %             U   U    T      I    L        I      T      Y                   %
  10 %              UUU     T    IIIII  LLLLL  IIIII    T      Y                   %
  11 %                                                                             %
  12 %                                                                             %
  13 %                       MagickCore Utility Methods                            %
  14 %                                                                             %
  15 %                             Software Design                                 %
  16 %                               John Cristy                                   %
  17 %                              January 1993                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2010 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %
  37 */
  38 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "magick/studio.h"
  43 #include "magick/property.h"
  44 #include "magick/blob.h"
  45 #include "magick/color.h"
  46 #include "magick/exception.h"
  47 #include "magick/exception-private.h"
  48 #include "magick/geometry.h"
  49 #include "magick/list.h"
  50 #include "magick/log.h"
  51 #include "magick/memory_.h"
  52 #include "magick/option.h"
  53 #include "magick/policy.h"
  54 #include "magick/resource_.h"
  55 #include "magick/semaphore.h"
  56 #include "magick/signature-private.h"
  57 #include "magick/statistic.h"
  58 #include "magick/string_.h"
  59 #include "magick/token.h"
  60 #include "magick/utility.h"
  61 #if defined(MAGICKCORE_HAVE_PROCESS_H)
  62 #include <process.h>
  63 #endif
  64 #if defined(MAGICKCORE_HAVE_MACH_O_DYLD_H)
  65 #include <mach-o/dyld.h>
  66 #endif
  67 \f
  68 /*
  69   Static declarations.
  70 */
  71 static const char
  72   Base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  73 \f
  74 /*
  75   Forward declaration.
  76 */
  77 static int
  78   IsPathDirectory(const char *);
  79 \f
  80 /*
  81 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  82 %                                                                             %
  83 %                                                                             %
  84 %                                                                             %
  85 %   A c q u i r e U n i q u e F i l e n a m e                                 %
  86 %                                                                             %
  87 %                                                                             %
  88 %                                                                             %
  89 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  90 %
  91 %  AcquireUniqueFilename() replaces the contents of path by a unique path name.
  92 %
  93 %  The format of the AcquireUniqueFilename method is:
  94 %
  95 %      MagickBooleanType AcquireUniqueFilename(char *path)
  96 %
  97 %  A description of each parameter follows.
  98 %
  99 %   o  path:  Specifies a pointer to an array of characters.  The unique path
 100 %      name is returned in this array.
 101 %
 102 */
 103 MagickExport MagickBooleanType AcquireUniqueFilename(char *path)
 104 {
 105   int
 106     file;
 107
 108   file=AcquireUniqueFileResource(path);
 109   if (file == -1)
 110     return(MagickFalse);
 111   file=close(file)-1;
 112   return(MagickTrue);
 113 }
 114 \f
 115 /*
 116 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 117 %                                                                             %
 118 %                                                                             %
 119 %                                                                             %
 120 %   A c q u i r e U n i q u e S ym b o l i c L i n k                          %
 121 %                                                                             %
 122 %                                                                             %
 123 %                                                                             %
 124 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 125 %
 126 %  AcquireUniqueSymbolicLink() creates a unique symbolic link to the specified
 127 %  source path and returns MagickTrue on success otherwise MagickFalse.  If the
 128 %  symlink() method fails or is not available, a unique file name is generated
 129 %  and the source file copied to it.  When you are finished with the file, use
 130 %  RelinquishUniqueFilename() to destroy it.
 131 %
 132 %  The format of the AcquireUniqueSymbolicLink method is:
 133 %
 134 %      MagickBooleanType AcquireUniqueSymbolicLink(const char *source,
 135 %        char destination)
 136 %
 137 %  A description of each parameter follows.
 138 %
 139 %   o  source:  the source path.
 140 %
 141 %   o  destination:  the destination path.
 142 %
 143 */
 144
 145 static inline size_t MagickMin(const size_t x,const size_t y)
 146 {
 147   if (x < y)
 148     return(x);
 149   return(y);
 150 }
 151
 152 MagickExport MagickBooleanType AcquireUniqueSymbolicLink(const char *source,
 153   char *destination)
 154 {
 155   int
 156     destination_file,
 157     source_file;
 158
 159   size_t
 160     length,
 161     quantum;
 162
 163   ssize_t
 164     count;
 165
 166   struct stat
 167     attributes;
 168
 169   unsigned char
 170     *buffer;
 171
 172   assert(source != (const char *) NULL);
 173   assert(destination != (char *) NULL);
 174 #if defined(MAGICKCORE_HAVE_SYMLINK)
 175   (void) AcquireUniqueFilename(destination);
 176   (void) RelinquishUniqueFileResource(destination);
 177   if (*source == *DirectorySeparator)
 178     {
 179       if (symlink(source,destination) == 0)
 180         return(MagickTrue);
 181     }
 182   else
 183     {
 184       char
 185         path[MaxTextExtent];
 186
 187       *path='\0';
 188       if (getcwd(path,MaxTextExtent) == (char *) NULL)
 189         return(MagickFalse);
 190       (void) ConcatenateMagickString(path,DirectorySeparator,MaxTextExtent);
 191       (void) ConcatenateMagickString(path,source,MaxTextExtent);
 192       if (symlink(path,destination) == 0)
 193         return(MagickTrue);
 194     }
 195 #endif
 196   destination_file=AcquireUniqueFileResource(destination);
 197   if (destination_file == -1)
 198     return(MagickFalse);
 199   source_file=open(source,O_RDONLY | O_BINARY);
 200   if (source_file == -1)
 201     {
 202       (void) close(destination_file);
 203       (void) RelinquishUniqueFileResource(destination);
 204       return(MagickFalse);
 205     }
 206   quantum=(size_t) MagickMaxBufferExtent;
 207   if ((fstat(source_file,&attributes) == 0) && (attributes.st_size != 0))
 208     quantum=MagickMin((size_t) attributes.st_size,MagickMaxBufferExtent);
 209   buffer=(unsigned char *) AcquireQuantumMemory(quantum,sizeof(*buffer));
 210   if (buffer == (unsigned char *) NULL)
 211     {
 212       (void) close(source_file);
 213       (void) close(destination_file);
 214       (void) RelinquishUniqueFileResource(destination);
 215       return(MagickFalse);
 216     }
 217   for (length=0; ; )
 218   {
 219     count=(ssize_t) read(source_file,buffer,quantum);
 220     if (count <= 0)
 221       break;
 222     length=(size_t) count;
 223     count=(ssize_t) write(destination_file,buffer,length);
 224     if ((size_t) count != length)
 225       {
 226         (void) close(destination_file);
 227         (void) close(source_file);
 228         buffer=(unsigned char *) RelinquishMagickMemory(buffer);
 229         (void) RelinquishUniqueFileResource(destination);
 230         return(MagickFalse);
 231       }
 232   }
 233   (void) close(destination_file);
 234   (void) close(source_file);
 235   buffer=(unsigned char *) RelinquishMagickMemory(buffer);
 236   return(MagickTrue);
 237 }
 238 \f
 239 /*
 240 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 241 %                                                                             %
 242 %                                                                             %
 243 %                                                                             %
 244 %  A p p e n d I m a g e F o r m a t                                          %
 245 %                                                                             %
 246 %                                                                             %
 247 %                                                                             %
 248 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 249 %
 250 %  AppendImageFormat() appends the image format type to the filename.  If an
 251 %  extension to the file already exists, it is first removed.
 252 %
 253 %  The format of the AppendImageFormat method is:
 254 %
 255 %      void AppendImageFormat(const char *format,char *filename)
 256 %
 257 %  A description of each parameter follows.
 258 %
 259 %   o  format:  Specifies a pointer to an array of characters.  This the
 260 %      format of the image.
 261 %
 262 %   o  filename:  Specifies a pointer to an array of characters.  The unique
 263 %      file name is returned in this array.
 264 %
 265 */
 266 MagickExport void AppendImageFormat(const char *format,char *filename)
 267 {
 268   char
 269     root[MaxTextExtent];
 270
 271   assert(format != (char *) NULL);
 272   assert(filename != (char *) NULL);
 273   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",filename);
 274   if ((*format == '\0') || (*filename == '\0'))
 275     return;
 276   if (LocaleCompare(filename,"-") == 0)
 277     {
 278       char
 279         message[MaxTextExtent];
 280
 281       (void) FormatMagickString(message,MaxTextExtent,"%s:%s",format,filename);
 282       (void) CopyMagickString(filename,message,MaxTextExtent);
 283       return;
 284     }
 285   GetPathComponent(filename,RootPath,root);
 286   (void) FormatMagickString(filename,MaxTextExtent,"%s.%s",root,format);
 287 }
 288 \f
 289 /*
 290 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 291 %                                                                             %
 292 %                                                                             %
 293 %                                                                             %
 294 %   B a s e 6 4 D e c o d e                                                   %
 295 %                                                                             %
 296 %                                                                             %
 297 %                                                                             %
 298 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 299 %
 300 %  Base64Decode() decodes Base64-encoded text and returns its binary
 301 %  equivalent.  NULL is returned if the text is not valid Base64 data, or a
 302 %  memory allocation failure occurs.
 303 %
 304 %  The format of the Base64Decode method is:
 305 %
 306 %      unsigned char *Base64Decode(const char *source,length_t *length)
 307 %
 308 %  A description of each parameter follows:
 309 %
 310 %    o source:  A pointer to a Base64-encoded string.
 311 %
 312 %    o length: the number of bytes decoded.
 313 %
 314 */
 315 MagickExport unsigned char *Base64Decode(const char *source,size_t *length)
 316 {
 317   int
 318     state;
 319
 320   register const char
 321     *p,
 322     *q;
 323
 324   register size_t
 325     i;
 326
 327   unsigned char
 328     *decode;
 329
 330   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
 331   assert(source != (char *) NULL);
 332   assert(length != (size_t *) NULL);
 333   *length=0;
 334   decode=(unsigned char *) AcquireQuantumMemory(strlen(source)/4+4,
 335     3*sizeof(*decode));
 336   if (decode == (unsigned char *) NULL)
 337     return((unsigned char *) NULL);
 338   i=0;
 339   state=0;
 340   for (p=source; *p != '\0'; p++)
 341   {
 342     if (isspace((int) ((unsigned char) *p)) != 0)
 343       continue;
 344     if (*p == '=')
 345       break;
 346     q=strchr(Base64,*p);
 347     if (q == (char *) NULL)
 348       {
 349         decode=(unsigned char *) RelinquishMagickMemory(decode);
 350         return((unsigned char *) NULL);  /* non-Base64 character */
 351       }
 352     switch (state)
 353     {
 354       case 0:
 355       {
 356         decode[i]=(q-Base64) << 2;
 357         state++;
 358         break;
 359       }
 360       case 1:
 361       {
 362         decode[i++]|=(q-Base64) >> 4;
 363         decode[i]=((q-Base64) & 0x0f) << 4;
 364         state++;
 365         break;
 366       }
 367       case 2:
 368       {
 369         decode[i++]|=(q-Base64) >> 2;
 370         decode[i]=((q-Base64) & 0x03) << 6;
 371         state++;
 372         break;
 373       }
 374       case 3:
 375       {
 376         decode[i++]|=(q-Base64);
 377         state=0;
 378         break;
 379       }
 380     }
 381   }
 382   /*
 383     Verify Base-64 string has proper terminal characters.
 384   */
 385   if (*p != '=')
 386     {
 387       if (state != 0)
 388         {
 389           decode=(unsigned char *) RelinquishMagickMemory(decode);
 390           return((unsigned char *) NULL);
 391         }
 392     }
 393   else
 394     {
 395       p++;
 396       switch (state)
 397       {
 398         case 0:
 399         case 1:
 400         {
 401           /*
 402             Unrecognized '=' character.
 403           */
 404           decode=(unsigned char *) RelinquishMagickMemory(decode);
 405           return((unsigned char *) NULL);
 406         }
 407         case 2:
 408         {
 409           for ( ; *p != '\0'; p++)
 410             if (isspace((int) ((unsigned char) *p)) == 0)
 411               break;
 412           if (*p != '=')
 413             {
 414               decode=(unsigned char *) RelinquishMagickMemory(decode);
 415               return((unsigned char *) NULL);
 416             }
 417           p++;
 418         }
 419         case 3:
 420         {
 421           for ( ; *p != '\0'; p++)
 422             if (isspace((int) ((unsigned char) *p)) == 0)
 423               {
 424                 decode=(unsigned char *) RelinquishMagickMemory(decode);
 425                 return((unsigned char *) NULL);
 426               }
 427           if ((int) decode[i] != 0)
 428             {
 429               decode=(unsigned char *) RelinquishMagickMemory(decode);
 430               return((unsigned char *) NULL);
 431             }
 432         }
 433       }
 434     }
 435   *length=i;
 436   return(decode);
 437 }
 438 \f
 439 /*
 440 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 441 %                                                                             %
 442 %                                                                             %
 443 %                                                                             %
 444 %   B a s e 6 4 E n c o d e                                                   %
 445 %                                                                             %
 446 %                                                                             %
 447 %                                                                             %
 448 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 449 %
 450 %  Base64Encode() encodes arbitrary binary data to Base64 encoded format as
 451 %  described by the "Base64 Content-Transfer-Encoding" section of RFC 2045 and
 452 %  returns the result as a null-terminated ASCII string.  NULL is returned if
 453 %  a memory allocation failure occurs.
 454 %
 455 %  The format of the Base64Encode method is:
 456 %
 457 %      char *Base64Encode(const unsigned char *blob,const size_t blob_length,
 458 %        size_t *encode_length)
 459 %
 460 %  A description of each parameter follows:
 461 %
 462 %    o blob:  A pointer to binary data to encode.
 463 %
 464 %    o blob_length: the number of bytes to encode.
 465 %
 466 %    o encode_length:  The number of bytes encoded.
 467 %
 468 */
 469 MagickExport char *Base64Encode(const unsigned char *blob,
 470   const size_t blob_length,size_t *encode_length)
 471 {
 472   char
 473     *encode;
 474
 475   register const unsigned char
 476     *p;
 477
 478   register size_t
 479     i;
 480
 481   size_t
 482     remainder;
 483
 484   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
 485   assert(blob != (const unsigned char *) NULL);
 486   assert(blob_length != 0);
 487   assert(encode_length != (size_t *) NULL);
 488   *encode_length=0;
 489   encode=(char *) AcquireQuantumMemory(blob_length/3+4,4*sizeof(*encode));
 490   if (encode == (char *) NULL)
 491     return((char *) NULL);
 492   i=0;
 493   for (p=blob; p < (blob+blob_length-2); p+=3)
 494   {
 495     encode[i++]=Base64[(int) (*p >> 2)];
 496     encode[i++]=Base64[(int) (((*p & 0x03) << 4)+(*(p+1) >> 4))];
 497     encode[i++]=Base64[(int) (((*(p+1) & 0x0f) << 2)+(*(p+2) >> 6))];
 498     encode[i++]=Base64[(int) (*(p+2) & 0x3f)];
 499   }
 500   remainder=blob_length % 3;
 501   if (remainder != 0)
 502     {
 503       long
 504         j;
 505
 506       unsigned char
 507         code[3];
 508
 509       code[0]='\0';
 510       code[1]='\0';
 511       code[2]='\0';
 512       for (j=0; j < (long) remainder; j++)
 513         code[j]=(*p++);
 514       encode[i++]=Base64[(int) (code[0] >> 2)];
 515       encode[i++]=Base64[(int) (((code[0] & 0x03) << 4)+(code[1] >> 4))];
 516       if (remainder == 1)
 517         encode[i++]='=';
 518       else
 519         encode[i++]=Base64[(int) (((code[1] & 0x0f) << 2)+(code[2] >> 6))];
 520       encode[i++]='=';
 521     }
 522   *encode_length=i;
 523   encode[i++]='\0';
 524   return(encode);
 525 }
 526 \f
 527 /*
 528 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 529 %                                                                             %
 530 %                                                                             %
 531 %                                                                             %
 532 %   C h o p P a t h C o m p o n e n t s                                       %
 533 %                                                                             %
 534 %                                                                             %
 535 %                                                                             %
 536 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 537 %
 538 %  ChopPathComponents() removes the number of specified file components from a
 539 %  path.
 540 %
 541 %  The format of the ChopPathComponents method is:
 542 %
 543 %      ChopPathComponents(char *path,unsigned long components)
 544 %
 545 %  A description of each parameter follows:
 546 %
 547 %    o path:  The path.
 548 %
 549 %    o components:  The number of components to chop.
 550 %
 551 */
 552 MagickExport void ChopPathComponents(char *path,const unsigned long components)
 553 {
 554   register long
 555     i;
 556
 557   for (i=0; i < (long) components; i++)
 558     GetPathComponent(path,HeadPath,path);
 559 }
 560 \f
 561 /*
 562 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 563 %                                                                             %
 564 %                                                                             %
 565 %                                                                             %
 566 %   E x p a n d F i l e n a m e                                               %
 567 %                                                                             %
 568 %                                                                             %
 569 %                                                                             %
 570 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 571 %
 572 %  ExpandFilename() expands '~' in a path.
 573 %
 574 %  The format of the ExpandFilename function is:
 575 %
 576 %      ExpandFilename(char *path)
 577 %
 578 %  A description of each parameter follows:
 579 %
 580 %    o path: Specifies a pointer to a character array that contains the
 581 %      path.
 582 %
 583 */
 584 MagickExport void ExpandFilename(char *path)
 585 {
 586   char
 587     expand_path[MaxTextExtent];
 588
 589   if (path == (char *) NULL)
 590     return;
 591   if (*path != '~')
 592     return;
 593   (void) CopyMagickString(expand_path,path,MaxTextExtent);
 594   if ((*(path+1) == *DirectorySeparator) || (*(path+1) == '\0'))
 595     {
 596       char
 597         *home;
 598
 599       /*
 600         Substitute ~ with $HOME.
 601       */
 602       (void) CopyMagickString(expand_path,".",MaxTextExtent);
 603       (void) ConcatenateMagickString(expand_path,path+1,MaxTextExtent);
 604       home=GetEnvironmentValue("HOME");
 605       if (home == (char *) NULL)
 606         home=GetEnvironmentValue("USERPROFILE");
 607       if (home != (char *) NULL)
 608         {
 609           (void) CopyMagickString(expand_path,home,MaxTextExtent);
 610           (void) ConcatenateMagickString(expand_path,path+1,MaxTextExtent);
 611           home=DestroyString(home);
 612         }
 613     }
 614   else
 615     {
 616 #if defined(MAGICKCORE_POSIX_SUPPORT) && !defined(__OS2__)
 617       char
 618         username[MaxTextExtent];
 619
 620       register char
 621         *p;
 622
 623       struct passwd
 624         *entry;
 625
 626       /*
 627         Substitute ~ with home directory from password file.
 628       */
 629       (void) CopyMagickString(username,path+1,MaxTextExtent);
 630       p=strchr(username,'/');
 631       if (p != (char *) NULL)
 632         *p='\0';
 633       entry=getpwnam(username);
 634       if (entry == (struct passwd *) NULL)
 635         return;
 636       (void) CopyMagickString(expand_path,entry->pw_dir,MaxTextExtent);
 637       if (p != (char *) NULL)
 638         {
 639           (void) ConcatenateMagickString(expand_path,"/",MaxTextExtent);
 640           (void) ConcatenateMagickString(expand_path,p+1,MaxTextExtent);
 641         }
 642 #endif
 643     }
 644   (void) CopyMagickString(path,expand_path,MaxTextExtent);
 645 }
 646 \f
 647 /*
 648 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 649 %                                                                             %
 650 %                                                                             %
 651 %                                                                             %
 652 %   E x p a n d F i l e n a m e s                                             %
 653 %                                                                             %
 654 %                                                                             %
 655 %                                                                             %
 656 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 657 %
 658 %  ExpandFilenames() checks each argument of the command line vector and
 659 %  expands it if they have a wildcard character.  For example, *.jpg might
 660 %  expand to:  bird.jpg rose.jpg tiki.jpg.
 661 %
 662 %  The format of the ExpandFilenames function is:
 663 %
 664 %      status=ExpandFilenames(int *number_arguments,char ***arguments)
 665 %
 666 %  A description of each parameter follows:
 667 %
 668 %    o number_arguments: Specifies a pointer to an integer describing the
 669 %      number of elements in the argument vector.
 670 %
 671 %    o arguments: Specifies a pointer to a text array containing the command
 672 %      line arguments.
 673 %
 674 */
 675 MagickExport MagickBooleanType ExpandFilenames(int *number_arguments,
 676   char ***arguments)
 677 {
 678   char
 679     *cwd,
 680     home_directory[MaxTextExtent],
 681     **vector;
 682
 683   long
 684     count,
 685     parameters;
 686
 687   register long
 688     i,
 689     j;
 690
 691   unsigned long
 692     number_files;
 693
 694   /*
 695     Allocate argument vector.
 696   */
 697   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
 698   assert(number_arguments != (int *) NULL);
 699   assert(arguments != (char ***) NULL);
 700   vector=(char **) AcquireQuantumMemory((size_t) (*number_arguments+1),
 701     sizeof(*vector));
 702   if (vector == (char **) NULL)
 703     ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
 704   /*
 705     Expand any wildcard filenames.
 706   */
 707   *home_directory='\0';
 708   count=0;
 709   for (i=0; i < (long) *number_arguments; i++)
 710   {
 711     char
 712       **filelist,
 713       filename[MaxTextExtent],
 714       magick[MaxTextExtent],
 715       *option,
 716       path[MaxTextExtent],
 717       subimage[MaxTextExtent];
 718
 719     MagickBooleanType
 720       destroy;
 721
 722     option=(*arguments)[i];
 723     *magick='\0';
 724     *path='\0';
 725     *filename='\0';
 726     *subimage='\0';
 727     vector[count++]=ConstantString(option);
 728     destroy=MagickTrue;
 729     parameters=ParseMagickOption(MagickCommandOptions,MagickFalse,option);
 730     if (parameters > 0)
 731       {
 732         /*
 733           Do not expand command option parameters.
 734         */
 735         for (j=0; j < parameters; j++)
 736         {
 737           i++;
 738           if (i == (long) *number_arguments)
 739             break;
 740           option=(*arguments)[i];
 741           vector[count++]=ConstantString(option);
 742         }
 743         continue;
 744       }
 745     if ((*option == '"') || (*option == '\''))
 746       continue;
 747     GetPathComponent(option,TailPath,filename);
 748     GetPathComponent(option,MagickPath,magick);
 749     if ((LocaleCompare(magick,"CAPTION") == 0) ||
 750         (LocaleCompare(magick,"LABEL") == 0) ||
 751         (LocaleCompare(magick,"VID") == 0))
 752       continue;
 753     if ((IsGlob(filename) == MagickFalse) && (*filename != '@'))
 754       continue;
 755     if (*filename != '@')
 756       {
 757         /*
 758           Generate file list from wildcard filename (e.g. *.jpg).
 759         */
 760         GetPathComponent(option,HeadPath,path);
 761         GetPathComponent(option,SubimagePath,subimage);
 762         ExpandFilename(path);
 763         if (*home_directory == '\0')
 764           cwd=getcwd(home_directory,MaxTextExtent-1);
 765         filelist=ListFiles(*path == '\0' ? home_directory : path,filename,
 766           &number_files);
 767       }
 768     else
 769       {
 770         char
 771           *files;
 772
 773         ExceptionInfo
 774           *exception;
 775
 776         int
 777           number_images;
 778
 779         /*
 780           Generate file list from file list (e.g. @filelist.txt).
 781         */
 782         exception=AcquireExceptionInfo();
 783         files=FileToString(filename+1,~0,exception);
 784         exception=DestroyExceptionInfo(exception);
 785         if (files == (char *) NULL)
 786           continue;
 787         StripString(files);
 788         filelist=StringToArgv(files,&number_images);
 789         files=DestroyString(files);
 790         number_files=(unsigned long) number_images;
 791         if (filelist != (char **) NULL)
 792           {
 793             number_files--;
 794             for (j=0; j < (long) number_files; j++)
 795               filelist[j]=filelist[j+1];
 796           }
 797       }
 798     if (filelist == (char **) NULL)
 799       continue;
 800     for (j=0; j < (long) number_files; j++)
 801       if (IsPathDirectory(filelist[j]) <= 0)
 802         break;
 803     if (j == (long) number_files)
 804       {
 805         for (j=0; j < (long) number_files; j++)
 806           filelist[j]=DestroyString(filelist[j]);
 807         filelist=(char **) RelinquishMagickMemory(filelist);
 808         continue;
 809       }
 810     /*
 811       Transfer file list to argument vector.
 812     */
 813     vector=(char **) ResizeQuantumMemory(vector,(size_t) *number_arguments+
 814       count+number_files+1,sizeof(*vector));
 815     if (vector == (char **) NULL)
 816       return(MagickFalse);
 817     for (j=0; j < (long) number_files; j++)
 818     {
 819       (void) CopyMagickString(filename,path,MaxTextExtent);
 820       if (*path != '\0')
 821         (void) ConcatenateMagickString(filename,DirectorySeparator,
 822           MaxTextExtent);
 823       (void) ConcatenateMagickString(filename,filelist[j],MaxTextExtent);
 824       filelist[j]=DestroyString(filelist[j]);
 825       if (strlen(filename) >= MaxTextExtent)
 826         ThrowFatalException(OptionFatalError,"FilenameTruncated");
 827       if (IsPathDirectory(filename) == 0)
 828         {
 829           char
 830             path[MaxTextExtent];
 831
 832           *path='\0';
 833           if (*magick != '\0')
 834             {
 835               (void) ConcatenateMagickString(path,magick,MaxTextExtent);
 836               (void) ConcatenateMagickString(path,":",MaxTextExtent);
 837             }
 838           (void) ConcatenateMagickString(path,filename,MaxTextExtent);
 839           if (*subimage != '\0')
 840             {
 841               (void) ConcatenateMagickString(path,"[",MaxTextExtent);
 842               (void) ConcatenateMagickString(path,subimage,MaxTextExtent);
 843               (void) ConcatenateMagickString(path,"]",MaxTextExtent);
 844             }
 845           if (strlen(path) >= MaxTextExtent)
 846             ThrowFatalException(OptionFatalError,"FilenameTruncated");
 847           if (destroy != MagickFalse)
 848             {
 849               count--;
 850               vector[count]=DestroyString(vector[count]);
 851               destroy=MagickFalse;
 852             }
 853           vector[count++]=ConstantString(path);
 854         }
 855     }
 856     filelist=(char **) RelinquishMagickMemory(filelist);
 857   }
 858   vector[count]=(char *) NULL;
 859   if (IsEventLogging() != MagickFalse)
 860     {
 861       char
 862         *command_line;
 863
 864       command_line=AcquireString(vector[0]);
 865       for (i=1; i < count; i++)
 866       {
 867         (void) ConcatenateString(&command_line," {");
 868         (void) ConcatenateString(&command_line,vector[i]);
 869         (void) ConcatenateString(&command_line,"}");
 870       }
 871       (void) LogMagickEvent(ConfigureEvent,GetMagickModule(),
 872         "Command line: %s",command_line);
 873       command_line=DestroyString(command_line);
 874     }
 875   *number_arguments=(int) count;
 876   *arguments=vector;
 877   return(MagickTrue);
 878 }
 879 \f
 880 /*
 881 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 882 %                                                                             %
 883 %                                                                             %
 884 %                                                                             %
 885 %   G e t E x e c u t i o n P a t h                                           %
 886 %                                                                             %
 887 %                                                                             %
 888 %                                                                             %
 889 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 890 %
 891 %  GetExecutionPath() returns the pathname of the executable that started
 892 %  the process.  On success MagickTrue is returned, otherwise MagickFalse.
 893 %
 894 %  The format of the GetExecutionPath method is:
 895 %
 896 %      MagickBooleanType GetExecutionPath(char *path,const size_t extent)
 897 %
 898 %  A description of each parameter follows:
 899 %
 900 %    o path: the pathname of the executable that started the process.
 901 %
 902 %    o extent: the maximum extent of the path.
 903 %
 904 */
 905 MagickExport MagickBooleanType GetExecutionPath(char *path,const size_t extent)
 906 {
 907   char
 908     *cwd;
 909
 910   *path='\0';
 911   cwd=getcwd(path,(unsigned long) extent);
 912 #if defined(MAGICKCORE_HAVE_GETPID) && defined(MAGICKCORE_HAVE_READLINK) && defined(PATH_MAX)
 913   {
 914     char
 915       link_path[MaxTextExtent],
 916       execution_path[PATH_MAX+1];
 917
 918     ssize_t
 919       count;
 920
 921     (void) FormatMagickString(link_path,MaxTextExtent,"/proc/%ld/exe",
 922       (long) getpid());
 923     count=readlink(link_path,execution_path,PATH_MAX);
 924     if (count == -1)
 925       {
 926         (void) FormatMagickString(link_path,MaxTextExtent,"/proc/%ld/file",
 927           (long) getpid());
 928         count=readlink(link_path,execution_path,PATH_MAX);
 929       }
 930     if ((count > 0) && (count <= (ssize_t) PATH_MAX))
 931       {
 932         execution_path[count]='\0';
 933         (void) CopyMagickString(path,execution_path,extent);
 934       }
 935   }
 936 #endif
 937 #if defined(MAGICKCORE_HAVE__NSGETEXECUTABLEPATH)
 938   {
 939     char
 940       executable_path[PATH_MAX << 1],
 941       execution_path[PATH_MAX+1];
 942
 943     uint32_t
 944       length;
 945
 946     length=sizeof(executable_path);
 947     if ((_NSGetExecutablePath(executable_path,&length) == 0) &&
 948         (realpath(executable_path,execution_path) != (char *) NULL))
 949       (void) CopyMagickString(path,execution_path,extent);
 950   }
 951 #endif
 952 #if defined(MAGICKCORE_HAVE_GETEXECNAME)
 953   {
 954     const char
 955       *execution_path;
 956
 957     execution_path=(const char *) getexecname();
 958     if (execution_path != (const char *) NULL)
 959       {
 960         if (*execution_path != *DirectorySeparator)
 961           (void) ConcatenateMagickString(path,DirectorySeparator,extent);
 962         (void) ConcatenateMagickString(path,execution_path,extent);
 963       }
 964   }
 965 #endif
 966 #if defined(__WINDOWS__)
 967   NTGetExecutionPath(path,extent);
 968 #endif
 969 #if defined(__GNU__)
 970   {
 971     char
 972       *program_name,
 973       *execution_path;
 974
 975     long
 976       count;
 977
 978     count=0;
 979     execution_path=(char *) NULL;
 980     program_name=program_invocation_name;
 981     if (*program_invocation_name != '/')
 982       {
 983         size_t
 984           extent;
 985
 986         extent=strlen(cwd)+strlen(program_name)+1;
 987         program_name=AcquireQuantumMemory(extent,sizeof(*program_name));
 988         if (program_name == (char *) NULL)
 989           program_name=program_invocation_name;
 990         else
 991           count=FormatMagickString(program_name,extent,"%s/%s",cwd,
 992             program_invocation_name);
 993       }
 994     if (count != -1)
 995       {
 996         execution_path=realpath(program_name,NULL);
 997         if (execution_path != (char *) NULL)
 998           (void) CopyMagickString(path,execution_path,extent);
 999       }
1000     if (program_name != program_invocation_name)
1001       program_name=(char *) RelinquishMagickMemory(program_name);
1002     execution_path=(char *) RelinquishMagickMemory(execution_path);
1003   }
1004 #endif
1005   return(IsPathAccessible(path));
1006 }
1007 \f
1008 /*
1009 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1010 %                                                                             %
1011 %                                                                             %
1012 %                                                                             %
1013 %   G e t M a g i c k P a g e S i z e                                         %
1014 %                                                                             %
1015 %                                                                             %
1016 %                                                                             %
1017 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1018 %
1019 %  GetMagickPageSize() returns the memory page size.
1020 %
1021 %  The format of the GetMagickPageSize method is:
1022 %
1023 %      long GetMagickPageSize()
1024 %
1025 */
1026 MagickExport long GetMagickPageSize(void)
1027 {
1028   static long
1029     page_size = -1;
1030
1031   if (page_size > 0)
1032     return(page_size);
1033 #if defined(MAGICKCORE_HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
1034   page_size=sysconf(_SC_PAGE_SIZE);
1035 #endif
1036 #if defined(MAGICKCORE_HAVE_GETPAGESIZE)
1037   if (page_size <= 0)
1038     page_size=getpagesize();
1039 #endif
1040   if (page_size <= 0)
1041     page_size=16384;
1042   return(page_size);
1043 }
1044 \f
1045 /*
1046 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1047 %                                                                             %
1048 %                                                                             %
1049 %                                                                             %
1050 %   G e t P a t h A t t r i b u t e s                                         %
1051 %                                                                             %
1052 %                                                                             %
1053 %                                                                             %
1054 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1055 %
1056 %  GetPathAttributes() returns attributes (e.g. size of file) about a path.
1057 %
1058 %  The path of the GetPathAttributes method is:
1059 %
1060 %      MagickBooleanType GetPathAttributes(const char *path,void *attributes)
1061 %
1062 %  A description of each parameter follows.
1063 %
1064 %   o  path: the file path.
1065 %
1066 %   o  attributes: the path attributes are returned here.
1067 %
1068 */
1069
1070 #if defined(MAGICKCORE_HAVE__WFOPEN)
1071 static size_t UTF8ToUTF16(const unsigned char *utf8,wchar_t *utf16)
1072 {
1073   register const unsigned char
1074     *p;
1075
1076   if (utf16 != (wchar_t *) NULL)
1077     {
1078       register wchar_t
1079         *q;
1080
1081       wchar_t
1082         c;
1083
1084       /*
1085         Convert UTF-8 to UTF-16.
1086       */
1087       q=utf16;
1088       for (p=utf8; *p != '\0'; p++)
1089       {
1090         if ((*p & 0x80) == 0)
1091           *q=(*p);
1092         else
1093           if ((*p & 0xE0) == 0xC0)
1094             {
1095               c=(*p);
1096               *q=(c & 0x1F) << 6;
1097               p++;
1098               if ((*p & 0xC0) != 0x80)
1099                 return(0);
1100               *q|=(*p & 0x3F);
1101             }
1102           else
1103             if ((*p & 0xF0) == 0xE0)
1104               {
1105                 c=(*p);
1106                 *q=c << 12;
1107                 p++;
1108                 if ((*p & 0xC0) != 0x80)
1109                   return(0);
1110                 c=(*p);
1111                 *q|=(c & 0x3F) << 6;
1112                 p++;
1113                 if ((*p & 0xC0) != 0x80)
1114                   return(0);
1115                 *q|=(*p & 0x3F);
1116               }
1117             else
1118               return(0);
1119         q++;
1120       }
1121       *q++='\0';
1122       return(q-utf16);
1123     }
1124   /*
1125     Compute UTF-16 string length.
1126   */
1127   for (p=utf8; *p != '\0'; p++)
1128   {
1129     if ((*p & 0x80) == 0)
1130       ;
1131     else
1132       if ((*p & 0xE0) == 0xC0)
1133         {
1134           p++;
1135           if ((*p & 0xC0) != 0x80)
1136             return(0);
1137         }
1138       else
1139         if ((*p & 0xF0) == 0xE0)
1140           {
1141             p++;
1142             if ((*p & 0xC0) != 0x80)
1143               return(0);
1144             p++;
1145             if ((*p & 0xC0) != 0x80)
1146               return(0);
1147          }
1148        else
1149          return(0);
1150   }
1151   return(p-utf8);
1152 }
1153
1154 static wchar_t *ConvertUTF8ToUTF16(const unsigned char *source)
1155 {
1156   size_t
1157     length;
1158
1159   wchar_t
1160     *utf16;
1161
1162   length=UTF8ToUTF16(source,(wchar_t *) NULL);
1163   if (length == 0)
1164     {
1165       register long
1166         i;
1167
1168       /*
1169         Not UTF-8, just copy.
1170       */
1171       length=strlen(source);
1172       utf16=(wchar_t *) AcquireQuantumMemory(length+1,sizeof(*utf16));
1173       if (utf16 == (wchar_t *) NULL)
1174         return((wchar_t *) NULL);
1175       for (i=0; i <= (long) length; i++)
1176         utf16[i]=source[i];
1177       return(utf16);
1178     }
1179   utf16=(wchar_t *) AcquireQuantumMemory(length+1,sizeof(*utf16));
1180   if (utf16 == (wchar_t *) NULL)
1181     return((wchar_t *) NULL);
1182   length=UTF8ToUTF16(source,utf16);
1183   return(utf16);
1184 }
1185 #endif
1186
1187 MagickExport MagickBooleanType GetPathAttributes(const char *path,
1188   void *attributes)
1189 {
1190   MagickBooleanType
1191     status;
1192
1193   if (path == (const char *) NULL)
1194     {
1195       errno=EINVAL;
1196       return(MagickFalse);
1197     }
1198 #if !defined(MAGICKCORE_HAVE__WSTAT)
1199   status=stat(path,(struct stat *) attributes) == 0 ? MagickTrue : MagickFalse;
1200 #else
1201   {
1202     wchar_t
1203       *unicode_path;
1204
1205     unicode_path=ConvertUTF8ToUTF16(path);
1206     if (unicode_path == (wchar_t *) NULL)
1207       return(MagickFalse);
1208     status=wstat(unicode_path,(struct stat *) attributes) == 0 ? MagickTrue :
1209       MagickFalse;
1210     unicode_path=(wchar_t *) RelinquishMagickMemory(unicode_path);
1211   }
1212 #endif
1213   return(status);
1214 }
1215 \f
1216 /*
1217 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1218 %                                                                             %
1219 %                                                                             %
1220 %                                                                             %
1221 %   G e t P a t h C o m p o n e n t                                           %
1222 %                                                                             %
1223 %                                                                             %
1224 %                                                                             %
1225 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1226 %
1227 %  GetPathComponent() returns the parent directory name, filename, basename, or
1228 %  extension of a file path.
1229 %
1230 %  The format of the GetPathComponent function is:
1231 %
1232 %      GetPathComponent(const char *path,PathType type,char *component)
1233 %
1234 %  A description of each parameter follows:
1235 %
1236 %    o path: Specifies a pointer to a character array that contains the
1237 %      file path.
1238 %
1239 %    o type: Specififies which file path component to return.
1240 %
1241 %    o component: the selected file path component is returned here.
1242 %
1243 */
1244 MagickExport void GetPathComponent(const char *path,PathType type,
1245   char *component)
1246 {
1247   char
1248     magick[MaxTextExtent],
1249     *q,
1250     subimage[MaxTextExtent];
1251
1252   register char
1253     *p;
1254
1255   assert(path != (const char *) NULL);
1256   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",path);
1257   assert(component != (char *) NULL);
1258   if (*path == '\0')
1259     {
1260       *component='\0';
1261       return;
1262     }
1263   (void) CopyMagickString(component,path,MaxTextExtent);
1264   *magick='\0';
1265 #if defined(__OS2__)
1266   if (path[1] != ":")
1267 #endif
1268   for (p=component; *p != '\0'; p++)
1269     if ((*p == ':') && (IsPathDirectory(path) < 0) &&
1270         (IsPathAccessible(path) == MagickFalse))
1271       {
1272         /*
1273           Look for image format specification (e.g. ps3:image).
1274         */
1275         (void) CopyMagickString(magick,component,(size_t) (p-component+1));
1276         if (IsMagickConflict(magick) != MagickFalse)
1277           *magick='\0';
1278         else
1279           for (q=component; *q != '\0'; q++)
1280             *q=(*++p);
1281         break;
1282       }
1283   *subimage='\0';
1284   p=component;
1285   if (*p != '\0')
1286     p=component+strlen(component)-1;
1287   if ((*p == ']') && (strchr(component,'[') != (char *) NULL) &&
1288       (IsPathAccessible(path) == MagickFalse))
1289     {
1290       /*
1291         Look for scene specification (e.g. img0001.pcd[4]).
1292       */
1293       for (q=p-1; q > component; q--)
1294         if (*q == '[')
1295           break;
1296       if (*q == '[')
1297         {
1298           (void) CopyMagickString(subimage,q+1,MaxTextExtent);
1299           subimage[p-q-1]='\0';
1300           if ((IsSceneGeometry(subimage,MagickFalse) == MagickFalse) &&
1301               (IsGeometry(subimage) == MagickFalse))
1302             *subimage='\0';
1303           else
1304             *q='\0';
1305         }
1306     }
1307   p=component;
1308   if (*p != '\0')
1309     for (p=component+strlen(component)-1; p > component; p--)
1310       if (IsBasenameSeparator(*p) != MagickFalse)
1311         break;
1312   switch (type)
1313   {
1314     case MagickPath:
1315     {
1316       (void) CopyMagickString(component,magick,MaxTextExtent);
1317       break;
1318     }
1319     case RootPath:
1320     {
1321       for (p=component+(strlen(component)-1); p > component; p--)
1322       {
1323         if (IsBasenameSeparator(*p) != MagickFalse)
1324           break;
1325         if (*p == '.')
1326           break;
1327       }
1328       if (*p == '.')
1329         *p='\0';
1330       break;
1331     }
1332     case HeadPath:
1333     {
1334       *p='\0';
1335       break;
1336     }
1337     case TailPath:
1338     {
1339       if (IsBasenameSeparator(*p) != MagickFalse)
1340         (void) CopyMagickMemory((unsigned char *) component,
1341           (const unsigned char *) (p+1),strlen(p+1)+1);
1342       break;
1343     }
1344     case BasePath:
1345     {
1346       if (IsBasenameSeparator(*p) != MagickFalse)
1347         (void) CopyMagickString(component,p+1,MaxTextExtent);
1348       for (p=component+(strlen(component)-1); p > component; p--)
1349         if (*p == '.')
1350           {
1351             *p='\0';
1352             break;
1353           }
1354       break;
1355     }
1356     case ExtensionPath:
1357     {
1358       if (IsBasenameSeparator(*p) != MagickFalse)
1359         (void) CopyMagickString(component,p+1,MaxTextExtent);
1360       p=component;
1361       if (*p != '\0')
1362         for (p=component+strlen(component)-1; p > component; p--)
1363           if (*p == '.')
1364             break;
1365       *component='\0';
1366       if (*p == '.')
1367         (void) CopyMagickString(component,p+1,MaxTextExtent);
1368       break;
1369     }
1370     case SubimagePath:
1371     {
1372       (void) CopyMagickString(component,subimage,MaxTextExtent);
1373       break;
1374     }
1375     case CanonicalPath:
1376     case UndefinedPath:
1377       break;
1378   }
1379 }
1380 \f
1381 /*
1382 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1383 %                                                                             %
1384 %                                                                             %
1385 %                                                                             %
1386 %  G e t P a t h C o m p o n e n t s                                          %
1387 %                                                                             %
1388 %                                                                             %
1389 %                                                                             %
1390 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1391 %
1392 %  GetPathComponents() returns a list of path components.
1393 %
1394 %  The format of the GetPathComponents method is:
1395 %
1396 %      char **GetPathComponents(const char *path,
1397 %        unsigned long *number_componenets)
1398 %
1399 %  A description of each parameter follows:
1400 %
1401 %    o path:  Specifies the string to segment into a list.
1402 %
1403 %    o number_components:  return the number of components in the list
1404 %
1405 */
1406 MagickExport char **GetPathComponents(const char *path,
1407   unsigned long *number_components)
1408 {
1409   char
1410     **components;
1411
1412   register const char
1413     *p,
1414     *q;
1415
1416   register long
1417     i;
1418
1419   if (path == (char *) NULL)
1420     return((char **) NULL);
1421   *number_components=1;
1422   for (p=path; *p != '\0'; p++)
1423     if (IsBasenameSeparator(*p))
1424       (*number_components)++;
1425   components=(char **) AcquireQuantumMemory((size_t) *number_components+1UL,
1426     sizeof(*components));
1427   if (components == (char **) NULL)
1428     ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
1429   p=path;
1430   for (i=0; i < (long) *number_components; i++)
1431   {
1432     for (q=p; *q != '\0'; q++)
1433       if (IsBasenameSeparator(*q))
1434         break;
1435     components[i]=(char *) AcquireQuantumMemory((size_t) (q-p)+MaxTextExtent,
1436       sizeof(*components));
1437     if (components[i] == (char *) NULL)
1438       ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
1439     (void) CopyMagickString(components[i],p,(size_t) (q-p+1));
1440     p=q+1;
1441   }
1442   components[i]=(char *) NULL;
1443   return(components);
1444 }
1445 \f
1446 /*
1447 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1448 %                                                                             %
1449 %                                                                             %
1450 %                                                                             %
1451 %  I s P a t h A c c e s s i b l e                                            %
1452 %                                                                             %
1453 %                                                                             %
1454 %                                                                             %
1455 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1456 %
1457 %  IsPathAccessible() returns MagickTrue if the file as defined by the path is
1458 %  accessible.
1459 %
1460 %  The format of the IsPathAccessible method is:
1461 %
1462 %      MagickBooleanType IsPathAccessible(const char *filename)
1463 %
1464 %  A description of each parameter follows.
1465 %
1466 %    o path:  Specifies a path to a file.
1467 %
1468 */
1469 MagickExport MagickBooleanType IsPathAccessible(const char *path)
1470 {
1471   MagickBooleanType
1472     status;
1473
1474   struct stat
1475     attributes;
1476
1477   if ((path == (const char *) NULL) || (*path == '\0'))
1478     return(MagickFalse);
1479   status=GetPathAttributes(path,&attributes);
1480   if (status == MagickFalse)
1481     return(status);
1482   if (S_ISREG(attributes.st_mode) == 0)
1483     return(MagickFalse);
1484   if (access(path,F_OK) != 0)
1485     return(MagickFalse);
1486   return(MagickTrue);
1487 }
1488 \f
1489 /*
1490 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1491 %                                                                             %
1492 %                                                                             %
1493 %                                                                             %
1494 +  I s P a t h D i r e c t o r y                                              %
1495 %                                                                             %
1496 %                                                                             %
1497 %                                                                             %
1498 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1499 %
1500 %  IsPathDirectory() returns -1 if the directory does not exist,  1 is returned
1501 %  if the path represents a directory otherwise 0.
1502 %
1503 %  The format of the IsPathDirectory method is:
1504 %
1505 %      int IsPathDirectory(const char *path)
1506 %
1507 %  A description of each parameter follows.
1508 %
1509 %   o  path:  The directory path.
1510 %
1511 */
1512 static int IsPathDirectory(const char *path)
1513 {
1514   MagickBooleanType
1515     status;
1516
1517   struct stat
1518     attributes;
1519
1520   if ((path == (const char *) NULL) || (*path == '\0'))
1521     return(MagickFalse);
1522   status=GetPathAttributes(path,&attributes);
1523   if (status == MagickFalse)
1524     return(-1);
1525   if (S_ISDIR(attributes.st_mode) == 0)
1526     return(0);
1527   return(1);
1528 }
1529 \f
1530 /*
1531 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1532 %                                                                             %
1533 %                                                                             %
1534 %                                                                             %
1535 %   I s M a g i c k T r u e                                                   %
1536 %                                                                             %
1537 %                                                                             %
1538 %                                                                             %
1539 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1540 %
1541 %  IsMagickTrue() returns MagickTrue if the value is "true", "on", "yes" or
1542 %  "1".
1543 %
1544 %  The format of the IsMagickTrue method is:
1545 %
1546 %      MagickBooleanType IsMagickTrue(const char *value)
1547 %
1548 %  A description of each parameter follows:
1549 %
1550 %    o option: either MagickTrue or MagickFalse depending on the value
1551 %      parameter.
1552 %
1553 %    o value: Specifies a pointer to a character array.
1554 %
1555 */
1556 MagickExport MagickBooleanType IsMagickTrue(const char *value)
1557 {
1558   if (value == (const char *) NULL)
1559     return(MagickFalse);
1560   if (LocaleCompare(value,"true") == 0)
1561     return(MagickTrue);
1562   if (LocaleCompare(value,"on") == 0)
1563     return(MagickTrue);
1564   if (LocaleCompare(value,"yes") == 0)
1565     return(MagickTrue);
1566   if (LocaleCompare(value,"1") == 0)
1567     return(MagickTrue);
1568   return(MagickFalse);
1569 }
1570 \f
1571 /*
1572 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1573 %                                                                             %
1574 %                                                                             %
1575 %                                                                             %
1576 %   L i s t F i l e s                                                         %
1577 %                                                                             %
1578 %                                                                             %
1579 %                                                                             %
1580 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1581 %
1582 %  ListFiles() reads the directory specified and returns a list of filenames
1583 %  contained in the directory sorted in ascending alphabetic order.
1584 %
1585 %  The format of the ListFiles function is:
1586 %
1587 %      char **ListFiles(const char *directory,const char *pattern,
1588 %        long *number_entries)
1589 %
1590 %  A description of each parameter follows:
1591 %
1592 %    o filelist: Method ListFiles returns a list of filenames contained
1593 %      in the directory.  If the directory specified cannot be read or it is
1594 %      a file a NULL list is returned.
1595 %
1596 %    o directory: Specifies a pointer to a text string containing a directory
1597 %      name.
1598 %
1599 %    o pattern: Specifies a pointer to a text string containing a pattern.
1600 %
1601 %    o number_entries:  This integer returns the number of filenames in the
1602 %      list.
1603 %
1604 */
1605
1606 #if defined(__cplusplus) || defined(c_plusplus)
1607 extern "C" {
1608 #endif
1609
1610 static int FileCompare(const void *x,const void *y)
1611 {
1612   register const char
1613     **p,
1614     **q;
1615
1616   p=(const char **) x;
1617   q=(const char **) y;
1618   return(LocaleCompare(*p,*q));
1619 }
1620
1621 #if defined(__cplusplus) || defined(c_plusplus)
1622 }
1623 #endif
1624
1625 static inline int MagickReadDirectory(DIR *directory,struct dirent *entry,
1626   struct dirent **result)
1627 {
1628 #if defined(MAGICKCORE_HAVE_READDIR_R)
1629   return(readdir_r(directory,entry,result));
1630 #else
1631   (void) entry;
1632   errno=0;
1633   *result=readdir(directory);
1634   return(errno);
1635 #endif
1636 }
1637
1638 MagickExport char **ListFiles(const char *directory,const char *pattern,
1639   unsigned long *number_entries)
1640 {
1641   char
1642     **filelist;
1643
1644   DIR
1645     *current_directory;
1646
1647   struct dirent
1648     *buffer,
1649     *entry;
1650
1651   unsigned long
1652     max_entries;
1653
1654   /*
1655     Open directory.
1656   */
1657   assert(directory != (const char *) NULL);
1658   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",directory);
1659   assert(pattern != (const char *) NULL);
1660   assert(number_entries != (unsigned long *) NULL);
1661   *number_entries=0;
1662   current_directory=opendir(directory);
1663   if (current_directory == (DIR *) NULL)
1664     return((char **) NULL);
1665   /*
1666     Allocate filelist.
1667   */
1668   max_entries=2048;
1669   filelist=(char **) AcquireQuantumMemory((size_t) max_entries,
1670     sizeof(*filelist));
1671   if (filelist == (char **) NULL)
1672     {
1673       (void) closedir(current_directory);
1674       return((char **) NULL);
1675     }
1676   /*
1677     Save the current and change to the new directory.
1678   */
1679   buffer=(struct dirent *) AcquireAlignedMemory(1,sizeof(*buffer)+FILENAME_MAX+1);
1680   if (buffer == (struct dirent *) NULL)
1681     ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
1682   while ((MagickReadDirectory(current_directory,buffer,&entry) == 0) &&
1683          (entry != (struct dirent *) NULL))
1684   {
1685     if (*entry->d_name == '.')
1686       continue;
1687     if ((IsPathDirectory(entry->d_name) > 0) ||
1688 #if defined(__WINDOWS__)
1689         (GlobExpression(entry->d_name,pattern,MagickTrue) != MagickFalse))
1690 #else
1691         (GlobExpression(entry->d_name,pattern,MagickFalse) != MagickFalse))
1692 #endif
1693       {
1694         if (*number_entries >= max_entries)
1695           {
1696             /*
1697               Extend the file list.
1698             */
1699             max_entries<<=1;
1700             filelist=(char **) ResizeQuantumMemory(filelist,(size_t)
1701               max_entries,sizeof(*filelist));
1702             if (filelist == (char **) NULL)
1703               break;
1704           }
1705 #if defined(vms)
1706         {
1707           register char
1708             *p;
1709
1710           p=strchr(entry->d_name,';');
1711           if (p)
1712             *p='\0';
1713           if (*number_entries > 0)
1714             if (LocaleCompare(entry->d_name,filelist[*number_entries-1]) == 0)
1715               continue;
1716         }
1717 #endif
1718         filelist[*number_entries]=(char *) AcquireString(entry->d_name);
1719         if (IsPathDirectory(entry->d_name) > 0)
1720           (void) ConcatenateMagickString(filelist[*number_entries],
1721             DirectorySeparator,MaxTextExtent);
1722         (*number_entries)++;
1723       }
1724   }
1725   buffer=(struct dirent *) RelinquishMagickMemory(buffer);
1726   (void) closedir(current_directory);
1727   if (filelist == (char **) NULL)
1728     return((char **) NULL);
1729   /*
1730     Sort filelist in ascending order.
1731   */
1732   qsort((void *) filelist,(size_t) *number_entries,sizeof(*filelist),
1733     FileCompare);
1734   return(filelist);
1735 }
1736 \f
1737 /*
1738 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1739 %                                                                             %
1740 %                                                                             %
1741 %                                                                             %
1742 %  M u l t i l i n e C e n s u s                                              %
1743 %                                                                             %
1744 %                                                                             %
1745 %                                                                             %
1746 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1747 %
1748 %  MultilineCensus() returns the number of lines within a label.  A line is
1749 %  represented by a \n character.
1750 %
1751 %  The format of the MultilineCenus method is:
1752 %
1753 %      unsigned long MultilineCensus(const char *label)
1754 %
1755 %  A description of each parameter follows.
1756 %
1757 %   o  label:  This character string is the label.
1758 %
1759 %
1760 */
1761 MagickExport unsigned long MultilineCensus(const char *label)
1762 {
1763   unsigned long
1764     number_lines;
1765
1766   /*
1767     Determine the number of lines within this label.
1768   */
1769   if (label == (char *) NULL)
1770     return(0);
1771   for (number_lines=1; *label != '\0'; label++)
1772     if (*label == '\n')
1773       number_lines++;
1774   return(number_lines);
1775 }
1776 \f
1777 /*
1778 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1779 %                                                                             %
1780 %                                                                             %
1781 %                                                                             %
1782 %   O p e n M a g i c k S t r e a m                                           %
1783 %                                                                             %
1784 %                                                                             %
1785 %                                                                             %
1786 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1787 %
1788 %  OpenMagickStream() opens the file at the specified path and return the
1789 %  associated stream.
1790 %
1791 %  The path of the OpenMagickStream method is:
1792 %
1793 %      FILE *OpenMagickStream(const char *path,const char *mode)
1794 %
1795 %  A description of each parameter follows.
1796 %
1797 %   o  path: the file path.
1798 %
1799 %   o  mode: the file mode.
1800 %
1801 */
1802 MagickExport FILE *OpenMagickStream(const char *path,const char *mode)
1803 {
1804   FILE
1805     *file;
1806
1807   if ((path == (const char *) NULL) || (mode == (const char *) NULL))
1808     {
1809       errno=EINVAL;
1810       return((FILE *) NULL);
1811     }
1812   file=(FILE *) NULL;
1813 #if defined(MAGICKCORE_HAVE__WFOPEN)
1814   {
1815     wchar_t
1816       *unicode_mode,
1817       *unicode_path;
1818
1819     unicode_path=ConvertUTF8ToUTF16(path);
1820     if (unicode_path == (wchar_t *) NULL)
1821       return((FILE *) NULL);
1822     unicode_mode=ConvertUTF8ToUTF16(mode);
1823     if (unicode_mode == (wchar_t *) NULL)
1824       {
1825         unicode_path=(wchar_t *) RelinquishMagickMemory(unicode_path);
1826         return((FILE *) NULL);
1827       }
1828     file=_wfopen(unicode_path,unicode_mode);
1829     unicode_mode=(wchar_t *) RelinquishMagickMemory(unicode_mode);
1830     unicode_path=(wchar_t *) RelinquishMagickMemory(unicode_path);
1831   }
1832 #endif
1833   if (file == (FILE *) NULL)
1834     file=fopen(path,mode);
1835   return(file);
1836 }
1837 \f
1838 /*
1839 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1840 %                                                                             %
1841 %                                                                             %
1842 %                                                                             %
1843 %   S y s t e m C o m m a n d                                                 %
1844 %                                                                             %
1845 %                                                                             %
1846 %                                                                             %
1847 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1848 %
1849 %  SystemCommand() executes the specified command and waits until it
1850 %  terminates.  The returned value is the exit status of the command.
1851 %
1852 %  The format of the SystemCommand method is:
1853 %
1854 %      int SystemCommand(const MagickBooleanType verbose,const char *command,
1855 %        ExceptionInfo *exception)
1856 %
1857 %  A description of each parameter follows:
1858 %
1859 %    o verbose: a value other than 0 prints the executed command before it is
1860 %      invoked.
1861 %
1862 %    o command: this string is the command to execute.
1863 %
1864 %    o exception: return any errors here.
1865 %
1866 */
1867 MagickExport int SystemCommand(const MagickBooleanType verbose,
1868   const char *command,ExceptionInfo *exception)
1869 {
1870   char
1871     **arguments;
1872
1873   int
1874     number_arguments,
1875     status;
1876
1877   PolicyDomain
1878     domain;
1879
1880   PolicyRights
1881     rights;
1882
1883   register long
1884     i;
1885
1886   status=(-1);
1887   arguments=StringToArgv(command,&number_arguments);
1888   if (arguments == (char **) NULL)
1889     return(status);
1890   domain=DelegatePolicyDomain;
1891   rights=ExecutePolicyRights;
1892   if (IsRightsAuthorized(domain,rights,arguments[1]) == MagickFalse)
1893     {
1894       (void) ThrowMagickException(exception,GetMagickModule(),PolicyError,
1895         "NotAuthorized","`%s'",arguments[1]);
1896       for (i=0; i < number_arguments; i++)
1897         arguments[i]=DestroyString(arguments[i]);
1898       arguments=(char **) RelinquishMagickMemory(arguments);
1899       return(-1);
1900     }
1901   if (verbose != MagickFalse)
1902     {
1903       (void) fprintf(stderr,"%s\n",command);
1904       (void) fflush(stderr);
1905     }
1906 #if defined(MAGICKCORE_POSIX_SUPPORT)
1907 #if defined(MAGICKCORE_HAVE_SPAWNVP)
1908   status=spawnvp(_P_WAIT,arguments[1],arguments+1);
1909 #elif !defined(MAGICKCORE_HAVE_EXECVP)
1910   status=system(command);
1911 #else
1912   if (strspn(command,"&;<>|") == 0)
1913     status=system(command);
1914   else
1915     {
1916       pid_t
1917         child_pid;
1918
1919       /*
1920         Call application directly rather than from a shell.
1921       */
1922       child_pid=fork();
1923       if (child_pid == (pid_t) -1)
1924         status=system(command);
1925       else
1926         if (child_pid == 0)
1927           {
1928             status=execvp(arguments[1],arguments+1);
1929             _exit(1);
1930           }
1931         else
1932           {
1933             int
1934               child_status;
1935
1936             pid_t
1937               pid;
1938
1939             child_status=0;
1940             pid=waitpid(child_pid,&child_status,0);
1941             if (pid == -1)
1942               status=(-1);
1943             else
1944               {
1945                 if (WIFEXITED(child_status) != 0)
1946                   status=WEXITSTATUS(child_status);
1947                 else
1948                   if (WIFSIGNALED(child_status))
1949                     status=(-1);
1950               }
1951           }
1952     }
1953 #endif
1954 #elif defined(__WINDOWS__)
1955   status=spawnvp(_P_WAIT,arguments[1],arguments+1);
1956 #elif defined(macintosh)
1957   status=MACSystemCommand(command);
1958 #elif defined(vms)
1959   status=system(command);
1960 #else
1961 #  error No suitable system() method.
1962 #endif
1963   if (status < 0)
1964     {
1965       char
1966         *message;
1967
1968       message=GetExceptionMessage(errno);
1969       (void) ThrowMagickException(exception,GetMagickModule(),DelegateError,
1970         "`%s': %s",command,message);
1971       message=DestroyString(message);
1972     }
1973   for (i=0; i < number_arguments; i++)
1974     arguments[i]=DestroyString(arguments[i]);
1975   arguments=(char **) RelinquishMagickMemory(arguments);
1976   return(status);
1977 }