lib/libc/compat/gen/compat_readdir.c

   1 /*      $NetBSD: compat_readdir.c,v 1.3 2012/02/08 12:10:17 mbalmer Exp $       */
   2
   3 #define __LIBC12_SOURCE__
   4 #include "namespace.h"
   5 #include <sys/param.h>
   6 #include <dirent.h>
   7 #include <errno.h>
   8 #include <string.h>
   9 #include <limits.h>
  10 #include <compat/include/dirent.h>
  11
  12 #ifdef __weak_alias
  13 __weak_alias(readdir,_readdir)
  14 __weak_alias(readdir_r,_readdir_r)
  15 #endif
  16
  17 #ifdef __warn_references
  18 __warn_references(readdir,
  19     "warning: reference to compatibility readdir(); include <dirent.h> for correct reference")
  20 __warn_references(readdir_r,
  21     "warning: reference to compatibility readdir_r(); include <dirent.h> for correct reference")
  22 #endif
  23
  24 static struct dirent12 *
  25 direnttodirent12(struct dirent12 *d12, const struct dirent *d)
  26 {
  27         if (d == NULL)
  28                 return NULL;
  29
  30         if (d->d_fileno > UINT_MAX || d->d_namlen >= sizeof(d12->d_name)) {
  31                 errno = ERANGE;
  32                 return NULL;
  33         }
  34         d12->d_fileno = (uint32_t)d->d_fileno;
  35         d12->d_reclen = (uint16_t)d->d_reclen;
  36         d12->d_namlen = (uint8_t)MIN(d->d_namlen, sizeof(d->d_name) - 1);
  37         d12->d_type = (uint8_t)d->d_type;
  38         memcpy(d12->d_name, d->d_name, (size_t)d12->d_namlen);
  39         d12->d_name[d12->d_namlen] = '\0';
  40         return d12;
  41 }
  42
  43 struct dirent12 *
  44 readdir(DIR *dirp)
  45 {
  46         static struct dirent12 d12;
  47         return direnttodirent12(&d12, __readdir30(dirp));
  48 }
  49
  50 int
  51 readdir_r(DIR *dirp, struct dirent12 *entry, struct dirent12 **result)
  52 {
  53         int error;
  54         struct dirent e, *ep;
  55
  56         if ((error = __readdir_r30(dirp, &e, &ep)) != 0)
  57                 return error;
  58
  59         *result = entry;
  60         (void)direnttodirent12(entry, &e);
  61         return 0;
  62 }