lib/replace/repdir.m4

   1 AC_CACHE_CHECK([for broken readdir],libreplace_cv_READDIR_NEEDED,[
   2         AC_TRY_RUN([
   3 #define test_readdir_os2_delete main
   4 #include "$libreplacedir/test/os2_delete.c"],
   5         [libreplace_cv_READDIR_NEEDED=no],
   6         [libreplace_cv_READDIR_NEEDED=yes],
   7         [libreplace_cv_READDIR_NEEDED="assuming not"])
   8 ])
   9
  10 AC_CHECK_FUNCS(dirfd)
  11 AC_HAVE_DECL(dirfd, [#include <dirent.h>])
  12
  13 #
  14 # try to replace with getdirentries() if needed
  15 #
  16 if test x"$libreplace_cv_READDIR_NEEDED" = x"yes"; then
  17 AC_CHECK_FUNCS(getdirentries)
  18 AC_VERIFY_C_PROTOTYPE([long telldir(const DIR *dir)],
  19         [
  20         return 0;
  21         ],[
  22         AC_DEFINE(TELLDIR_TAKES_CONST_DIR, 1, [Whether telldir takes a const pointer])
  23         ],[],[
  24         #include <dirent.h>
  25         ])
  26
  27 AC_VERIFY_C_PROTOTYPE([int seekdir(DIR *dir, long ofs)],
  28         [
  29         return 0;
  30         ],[
  31         AC_DEFINE(SEEKDIR_RETURNS_INT, 1, [Whether seekdir returns an int])
  32         ],[],[
  33         #include <dirent.h>
  34         ])
  35 AC_CACHE_CHECK([for replacing readdir using getdirentries()],libreplace_cv_READDIR_GETDIRENTRIES,[
  36         AC_TRY_RUN([
  37 #define _LIBREPLACE_REPLACE_H
  38 #include "$libreplacedir/repdir_getdirentries.c"
  39 #define test_readdir_os2_delete main
  40 #include "$libreplacedir/test/os2_delete.c"],
  41         [libreplace_cv_READDIR_GETDIRENTRIES=yes],
  42         [libreplace_cv_READDIR_GETDIRENTRIES=no])
  43 ])
  44 fi
  45 if test x"$libreplace_cv_READDIR_GETDIRENTRIES" = x"yes"; then
  46         AC_DEFINE(REPLACE_READDIR,1,[replace readdir])
  47         AC_DEFINE(REPLACE_READDIR_GETDIRENTRIES,1,[replace readdir using getdirentries()])
  48         LIBREPLACEOBJ="${LIBREPLACEOBJ} repdir_getdirentries.o"
  49         libreplace_cv_READDIR_NEEDED=no
  50 fi
  51
  52 #
  53 # try to replace with getdents() if needed
  54 #
  55 if test x"$libreplace_cv_READDIR_NEEDED" = x"yes"; then
  56 AC_CHECK_FUNCS(getdents)
  57 AC_CACHE_CHECK([for replacing readdir using getdents()],libreplace_cv_READDIR_GETDENTS,[
  58         AC_TRY_RUN([
  59 #define _LIBREPLACE_REPLACE_H
  60 #error _donot_use_getdents_replacement_anymore
  61 #include "$libreplacedir/repdir_getdents.c"
  62 #define test_readdir_os2_delete main
  63 #include "$libreplacedir/test/os2_delete.c"],
  64         [libreplace_cv_READDIR_GETDENTS=yes],
  65         [libreplace_cv_READDIR_GETDENTS=no])
  66 ])
  67 fi
  68 if test x"$libreplace_cv_READDIR_GETDENTS" = x"yes"; then
  69         AC_DEFINE(REPLACE_READDIR,1,[replace readdir])
  70         AC_DEFINE(REPLACE_READDIR_GETDENTS,1,[replace readdir using getdents()])
  71         LIBREPLACEOBJ="${LIBREPLACEOBJ} repdir_getdents.o"
  72         libreplace_cv_READDIR_NEEDED=no
  73 fi
  74
  75 AC_MSG_CHECKING([a usable readdir()])
  76 if test x"$libreplace_cv_READDIR_NEEDED" = x"yes"; then
  77         AC_MSG_RESULT(no)
  78         AC_MSG_WARN([the provided readdir() is broken])
  79 else
  80         AC_MSG_RESULT(yes)
  81 fi