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 <unistd.h>
  15
  16 #include "map.h"
  17 #include "mph.h"
  18
  19 G_BEGIN_DECLS
  20
  21 gint32
  22 Mono_Posix_Syscall_seekdir (void *dir, mph_off_t offset)
  23 {
  24         mph_return_if_off_t_overflow (offset);
  25
  26         errno = 0;
  27
  28         seekdir ((DIR*) dir, (off_t) offset);
  29
  30         return errno != 0;
  31 }
  32
  33 mph_off_t
  34 Mono_Posix_Syscall_telldir (void *dir)
  35 {
  36         return telldir ((DIR*) dir);
  37 }
  38
  39 static void
  40 copy_dirent (struct Mono_Posix_Syscall__Dirent *to, struct dirent *from)
  41 {
  42         memset (to, 0, sizeof(*to));
  43
  44         to->d_ino    = from->d_ino;
  45         to->d_name   = strdup (from->d_name);
  46
  47 #ifdef HAVE_STRUCT_DIRENT_D_OFF
  48         to->d_off    = from->d_off;
  49 #endif
  50 #ifdef HAVE_STRUCT_DIRENT_D_RECLEN
  51         to->d_reclen = from->d_reclen;
  52 #endif
  53 #ifdef HAVE_STRUCT_DIRENT_D_TYPE
  54         to->d_type   = from->d_type;
  55 #endif
  56 }
  57
  58 gint32
  59 Mono_Posix_Syscall_readdir (void *dirp, struct Mono_Posix_Syscall__Dirent *entry)
  60 {
  61         struct dirent *d;
  62
  63         if (entry == NULL) {
  64                 errno = EFAULT;
  65                 return -1;
  66         }
  67
  68         d = readdir (dirp);
  69
  70         if (d == NULL) {
  71                 return -1;
  72         }
  73
  74         copy_dirent (entry, d);
  75
  76         return 0;
  77 }
  78
  79 gint32
  80 Mono_Posix_Syscall_readdir_r (void *dirp, struct Mono_Posix_Syscall__Dirent *entry, void **result)
  81 {
  82         struct dirent _entry;
  83         int r;
  84
  85         r = readdir_r (dirp, &_entry, (struct dirent**) result);
  86
  87         if (r == 0 && result != NULL) {
  88                 copy_dirent (entry, &_entry);
  89         }
  90
  91         return r;
  92 }
  93
  94 int
  95 Mono_Posix_Syscall_rewinddir (void* dir)
  96 {
  97         errno = 0;
  98         rewinddir (dir);
  99         return errno == 0 ? 0 : -1;
 100 }
 101
 102 G_END_DECLS
 103
 104 /*
 105  * vim: noexpandtab
 106  */