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 #if HAVE_SEEKDIR
  33 gint32
  34 Mono_Posix_Syscall_seekdir (void *dir, mph_off_t offset)
  35 {
  36         mph_return_if_off_t_overflow (offset);
  37
  38         seekdir ((DIR*) dir, (off_t) offset);
  39
  40         return 0;
  41 }
  42 #endif  /* def HAVE_SEEKDIR */
  43
  44 #if HAVE_TELLDIR
  45 mph_off_t
  46 Mono_Posix_Syscall_telldir (void *dir)
  47 {
  48         return telldir ((DIR*) dir);
  49 }
  50 #endif  /* def HAVE_TELLDIR */
  51
  52 static void
  53 copy_dirent (struct Mono_Posix_Syscall__Dirent *to, struct dirent *from)
  54 {
  55         memset (to, 0, sizeof(*to));
  56
  57         to->d_ino    = from->d_ino;
  58         to->d_name   = strdup (from->d_name);
  59
  60 #ifdef HAVE_STRUCT_DIRENT_D_OFF
  61         to->d_off    = from->d_off;
  62 #endif
  63 #ifdef HAVE_STRUCT_DIRENT_D_RECLEN
  64         to->d_reclen = from->d_reclen;
  65 #endif
  66 #ifdef HAVE_STRUCT_DIRENT_D_TYPE
  67         to->d_type   = from->d_type;
  68 #endif
  69 }
  70
  71 gint32
  72 Mono_Posix_Syscall_readdir (void *dirp, struct Mono_Posix_Syscall__Dirent *entry)
  73 {
  74         struct dirent *d;
  75
  76         if (entry == NULL) {
  77                 errno = EFAULT;
  78                 return -1;
  79         }
  80
  81         errno = 0;
  82         d = readdir (dirp);
  83
  84         if (d == NULL) {
  85                 return -1;
  86         }
  87
  88         copy_dirent (entry, d);
  89
  90         return 0;
  91 }
  92
  93 gint32
  94 Mono_Posix_Syscall_readdir_r (void *dirp, struct Mono_Posix_Syscall__Dirent *entry, void **result)
  95 {
  96         struct dirent *_entry = malloc (sizeof (struct dirent) + MPH_PATH_MAX + 1);
  97         int r;
  98
  99         r = readdir_r (dirp, _entry, (struct dirent**) result);
 100
 101         if (r == 0 && *result != NULL) {
 102                 copy_dirent (entry, _entry);
 103         }
 104
 105         free (_entry);
 106
 107         return r;
 108 }
 109
 110 int
 111 Mono_Posix_Syscall_rewinddir (void* dir)
 112 {
 113         rewinddir (dir);
 114         return 0;
 115 }
 116
 117 G_END_DECLS
 118
 119 /*
 120  * vim: noexpandtab
 121  */