lib/lfs.h

   1 /*
   2  *      Sherlock Library -- Large File Support
   3  *
   4  *      (c) 1999--2002 Martin Mares <mj@ucw.cz>
   5  *
   6  *      This software may be freely distributed and used according to the terms
   7  *      of the GNU Lesser General Public License.
   8  */
   9
  10 #ifndef _SHERLOCK_LFS_H
  11 #define _SHERLOCK_LFS_H
  12
  13 #include <fcntl.h>
  14 #include <unistd.h>
  15
  16 #ifdef CONFIG_LARGE_FILES
  17
  18 #define sh_open open64
  19 #define sh_seek lseek64
  20 #define sh_pread pread64
  21 #define sh_pwrite pwrite64
  22 #define sh_ftruncate ftruncate64
  23 #define sh_mmap(a,l,p,f,d,o) mmap64(a,l,p,f,d,o)
  24 #define sh_pread pread64
  25 #define sh_pwrite pwrite64
  26
  27 #else   /* !CONFIG_LARGE_FILES */
  28
  29 #define sh_open open
  30 #define sh_seek(f,o,w) lseek(f,o,w)
  31 #define sh_ftruncate(f,o) ftruncate(f,o)
  32 #define sh_mmap(a,l,p,f,d,o) mmap(a,l,p,f,d,o)
  33 #define sh_pread pread
  34 #define sh_pwrite pwrite
  35
  36 #endif  /* !CONFIG_LARGE_FILES */
  37
  38 #define SHERLOCK_HAVE_PREAD
  39
  40 static inline sh_off_t
  41 sh_file_size(byte *name)
  42 {
  43   int fd = sh_open(name, O_RDONLY);
  44   if (fd < 0)
  45     die("Cannot open %s: %m", name);
  46   sh_off_t len = sh_seek(fd, 0, SEEK_END);
  47   close(fd);
  48   return len;
  49 }
  50
  51 #endif  /* !_SHERLOCK_LFS_H */