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 "mph.h"
  17
  18 G_BEGIN_DECLS
  19
  20 struct Mono_Posix_Syscall__Dirent {
  21         /* ino_t  */ mph_ino_t      d_ino;
  22         /* off_t  */ mph_off_t      d_off;
  23         /* ushort */ unsigned short d_reclen;
  24         /* byte   */ unsigned char  d_type;
  25         /* string */ char          *d_name;
  26 };
  27
  28 gint32
  29 Mono_Posix_Syscall_seekdir (void *dir, mph_off_t offset)
  30 {
  31         mph_return_if_off_t_overflow (offset);
  32
  33         errno = 0;
  34
  35         seekdir ((DIR*) dir, (off_t) offset);
  36
  37         return errno != 0;
  38 }
  39
  40 mph_off_t
  41 Mono_Posix_Syscall_telldir (void *dir)
  42 {
  43         return telldir ((DIR*) dir);
  44 }
  45
  46 static void
  47 copy_dirent (struct Mono_Posix_Syscall__Dirent *to, struct dirent *from)
  48 {
  49         memset (to, 0, sizeof(*to));
  50
  51         to->d_ino    = from->d_ino;
  52         to->d_name   = strdup (from->d_name);
  53
  54 #ifdef HAVE_STRUCT_DIRENT_D_OFF
  55         to->d_off    = from->d_off;
  56 #endif
  57 #ifdef HAVE_STRUCT_DIRENT_D_RECLEN
  58         to->d_reclen = from->d_reclen;
  59 #endif
  60 #ifdef HAVE_STRUCT_DIRENT_D_TYPE
  61         to->d_type   = from->d_type;
  62 #endif
  63 }
  64
  65 gint32
  66 Mono_Posix_Syscall_readdir (void *dirp, struct Mono_Posix_Syscall__Dirent *entry)
  67 {
  68         struct dirent *d;
  69
  70         if (entry == NULL) {
  71                 errno = EFAULT;
  72                 return -1;
  73         }
  74
  75         d = readdir (dirp);
  76
  77         if (d == NULL) {
  78                 return -1;
  79         }
  80
  81         copy_dirent (entry, d);
  82
  83         return 0;
  84 }
  85
  86 gint32
  87 Mono_Posix_Syscall_readdir_r (void *dirp, struct Mono_Posix_Syscall__Dirent *entry, void **result)
  88 {
  89         struct dirent _entry;
  90         int r;
  91
  92         r = readdir_r (dirp, &_entry, (struct dirent**) result);
  93
  94         if (r == 0 && result != NULL) {
  95                 copy_dirent (entry, &_entry);
  96         }
  97
  98         return r;
  99 }
 100
 101 int
 102 Mono_Posix_Syscall_rewinddir (void* dir)
 103 {
 104         errno = 0;
 105         rewinddir (dir);
 106         return errno == 0 ? 0 : -1;
 107 }
 108
 109 G_END_DECLS
 110
 111 /*
 112  * vim: noexpandtab
 113  */