1  /*
       2                              __  __            _
       3                           ___\ \/ /_ __   __ _| |_
       4                          / _ \\  /| '_ \ / _` | __|
       5                         |  __//  \| |_) | (_| | |_
       6                          \___/_/\_\ .__/ \__,_|\__|
       7                                   |_| XML parser
       8  
       9     Copyright (c) 1997-2000 Thai Open Source Software Center Ltd
      10     Copyright (c) 2000      Clark Cooper <coopercc@users.sourceforge.net>
      11     Copyright (c) 2001-2002 Fred L. Drake, Jr. <fdrake@users.sourceforge.net>
      12     Copyright (c) 2006      Karl Waclawek <karl@waclawek.net>
      13     Copyright (c) 2016-2017 Sebastian Pipping <sebastian@pipping.org>
      14     Copyright (c) 2017      Rhodri James <rhodri@wildebeest.org.uk>
      15     Licensed under the MIT license:
      16  
      17     Permission is  hereby granted,  free of charge,  to any  person obtaining
      18     a  copy  of  this  software   and  associated  documentation  files  (the
      19     "Software"),  to  deal in  the  Software  without restriction,  including
      20     without  limitation the  rights  to use,  copy,  modify, merge,  publish,
      21     distribute, sublicense, and/or sell copies of the Software, and to permit
      22     persons  to whom  the Software  is  furnished to  do so,  subject to  the
      23     following conditions:
      24  
      25     The above copyright  notice and this permission notice  shall be included
      26     in all copies or substantial portions of the Software.
      27  
      28     THE  SOFTWARE  IS  PROVIDED  "AS  IS",  WITHOUT  WARRANTY  OF  ANY  KIND,
      29     EXPRESS  OR IMPLIED,  INCLUDING  BUT  NOT LIMITED  TO  THE WARRANTIES  OF
      30     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
      31     NO EVENT SHALL THE AUTHORS OR  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
      32     DAMAGES OR  OTHER LIABILITY, WHETHER  IN AN  ACTION OF CONTRACT,  TORT OR
      33     OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
      34     USE OR OTHER DEALINGS IN THE SOFTWARE.
      35  */
      36  
      37  #include <sys/types.h>
      38  #include <sys/mman.h>
      39  #include <sys/stat.h>
      40  #include <fcntl.h>
      41  #include <errno.h>
      42  #include <string.h>
      43  #include <stdio.h>
      44  #include <unistd.h>
      45  
      46  #ifndef MAP_FILE
      47  #  define MAP_FILE 0
      48  #endif
      49  
      50  #include "xmltchar.h"
      51  #include "filemap.h"
      52  
      53  #ifdef XML_UNICODE_WCHAR_T
      54  #  define XML_FMT_STR "ls"
      55  #else
      56  #  define XML_FMT_STR "s"
      57  #endif
      58  
      59  int
      60  filemap(const tchar *name,
      61          void (*processor)(const void *, size_t, const tchar *, void *arg),
      62          void *arg) {
      63    int fd;
      64    size_t nbytes;
      65    struct stat sb;
      66    void *p;
      67  
      68    fd = topen(name, O_RDONLY);
      69    if (fd < 0) {
      70      tperror(name);
      71      return 0;
      72    }
      73    if (fstat(fd, &sb) < 0) {
      74      tperror(name);
      75      close(fd);
      76      return 0;
      77    }
      78    if (! S_ISREG(sb.st_mode)) {
      79      close(fd);
      80      fprintf(stderr, "%" XML_FMT_STR ": not a regular file\n", name);
      81      return 0;
      82    }
      83    if (sb.st_size > XML_MAX_CHUNK_LEN) {
      84      close(fd);
      85      return 2; /* Cannot be passed to XML_Parse in one go */
      86    }
      87  
      88    nbytes = sb.st_size;
      89    /* mmap fails for zero length files */
      90    if (nbytes == 0) {
      91      static const char c = '\0';
      92      processor(&c, 0, name, arg);
      93      close(fd);
      94      return 1;
      95    }
      96    p = (void *)mmap((void *)0, (size_t)nbytes, PROT_READ, MAP_FILE | MAP_PRIVATE,
      97                     fd, (off_t)0);
      98    if (p == (void *)-1) {
      99      tperror(name);
     100      close(fd);
     101      return 0;
     102    }
     103    processor(p, nbytes, name, arg);
     104    munmap((void *)p, nbytes);
     105    close(fd);
     106    return 1;
     107  }