support/dirent.c

   1 /*
   2  * <dirent.h> wrapper functions.
   3  *
   4  * Authors:
   5  *   Jonathan Pryor (jonpryor@vt.edu)
   6  *
   7  * Copyright (C) 2004-2005 Jonathan Pryor
   8  */
   9
  10 #include <dirent.h>
  11 #include <errno.h>
  12 #include <string.h>
  13 #include <stdlib.h>
  14 #include <limits.h>
  15 #include <unistd.h>
  16
  17 #include "map.h"
  18 #include "mph.h"
  19
  20 #if defined (PATH_MAX) && defined (NAME_MAX)
  21         #define MPH_PATH_MAX MAX(PATH_MAX, NAME_MAX)
  22 #elif defined (PATH_MAX)
  23         #define MPH_PATH_MAX PATH_MAX
  24 #elif defined (NAME_MAX)
  25         #define MPH_PATH_MAX NAME_MAX
  26 #else /* !defined PATH_MAX && !defined NAME_MAX */
  27         #define MPH_PATH_MAX 2048
  28 #endif
  29
  30 G_BEGIN_DECLS
  31
  32 gint32
  33 Mono_Posix_Syscall_seekdir (void *dir, mph_off_t offset)
  34 {
  35         mph_return_if_off_t_overflow (offset);
  36
  37         seekdir ((DIR*) dir, (off_t) offset);
  38
  39         return 0;
  40 }
  41
  42 mph_off_t
  43 Mono_Posix_Syscall_telldir (void *dir)
  44 {
  45         return telldir ((DIR*) dir);
  46 }
  47
  48 static void
  49 copy_dirent (struct Mono_Posix_Syscall__Dirent *to, struct dirent *from)
  50 {
  51         memset (to, 0, sizeof(*to));
  52
  53         to->d_ino    = from->d_ino;
  54         to->d_name   = strdup (from->d_name);
  55
  56 #ifdef HAVE_STRUCT_DIRENT_D_OFF
  57         to->d_off    = from->d_off;
  58 #endif
  59 #ifdef HAVE_STRUCT_DIRENT_D_RECLEN
  60         to->d_reclen = from->d_reclen;
  61 #endif
  62 #ifdef HAVE_STRUCT_DIRENT_D_TYPE
  63         to->d_type   = from->d_type;
  64 #endif
  65 }
  66
  67 gint32
  68 Mono_Posix_Syscall_readdir (void *dirp, struct Mono_Posix_Syscall__Dirent *entry)
  69 {
  70         struct dirent *d;
  71
  72         if (entry == NULL) {
  73                 errno = EFAULT;
  74                 return -1;
  75         }
  76
  77         d = readdir (dirp);
  78
  79         if (d == NULL) {
  80                 return -1;
  81         }
  82
  83         copy_dirent (entry, d);
  84
  85         return 0;
  86 }
  87
  88 gint32
  89 Mono_Posix_Syscall_readdir_r (void *dirp, struct Mono_Posix_Syscall__Dirent *entry, void **result)
  90 {
  91         struct dirent *_entry = malloc (sizeof (struct dirent) + MPH_PATH_MAX + 1);
  92         int r;
  93
  94         r = readdir_r (dirp, _entry, (struct dirent**) result);
  95
  96         if (r == 0 && *result != NULL) {
  97                 copy_dirent (entry, _entry);
  98         }
  99
 100         free (_entry);
 101
 102         return r;
 103 }
 104
 105 int
 106 Mono_Posix_Syscall_rewinddir (void* dir)
 107 {
 108         rewinddir (dir);
 109         return 0;
 110 }
 111
 112 G_END_DECLS
 113
 114 /*
 115  * vim: noexpandtab
 116  */