cbits/dirUtils.c

   1 /*
   2  * (c) The University of Glasgow 2002
   3  *
   4  * Directory Runtime Support
   5  */
   6 #include "HsBase.h"
   7
   8 #if defined(mingw32_TARGET_OS)
   9 #include <windows.h>
  10 #endif
  11
  12 /*
  13  * read an entry from the directory stream; opt for the
  14  * re-entrant friendly way of doing this, if available.
  15  */
  16 HsInt
  17 __hscore_readdir( HsAddr dirPtr, HsAddr pDirEnt )
  18 {
  19   struct dirent **pDirE = (struct dirent**)pDirEnt;
  20 #if HAVE_READDIR_R
  21   struct dirent* p;
  22   int res;
  23   static unsigned int nm_max = -1;
  24
  25   if (pDirE == NULL) {
  26     return -1;
  27   }
  28   if (nm_max == -1) {
  29 #ifdef NAME_MAX
  30     nm_max = NAME_MAX + 1;
  31 #else
  32     nm_max = pathconf(".", _PC_NAME_MAX);
  33     if (nm_max == -1) { nm_max = 255; }
  34     nm_max++;
  35 #endif
  36   }
  37   p = (struct dirent*)malloc(sizeof(struct dirent) + nm_max);
  38   if (p == NULL) return -1;
  39   res = readdir_r((DIR*)dirPtr, p, pDirE);
  40   if (res != 0) {
  41     *pDirE = NULL;
  42     free(p);
  43   }
  44   return res;
  45 #else
  46
  47   if (pDirE == NULL) {
  48     return -1;
  49   }
  50
  51   *pDirE = readdir((DIR*)dirPtr);
  52   if (*pDirE == NULL) {
  53     return -1;
  54   } else {
  55     return 0;
  56   }
  57 #endif
  58 }