[project @ 2004-09-01 15:57:13 by ross]

devolve the recently added dirent checks to a new libraries/base/configure.ac

1 files changed, 94 insertions, 0 deletions

diff --git a/libraries/base/aclocal.m4 b/libraries/base/aclocal.m4
new file mode 100644
index 0000000000..dae32b6701
--- /dev/null
+++ b/libraries/base/aclocal.m4
@@ -0,0 +1,94 @@
+dnl @synopsis FP_READDIR_EOF_ERRNO
+dnl
+dnl Check what readdir() sets 'errno' to upon reaching 
+dnl end of directory; not setting it is the correct thing to do,
+dnl but mingw based versions have set it to ENOENT until recently
+dnl (summer 2004).
+dnl
+dnl
+AC_DEFUN(FP_READDIR_EOF_ERRNO,
+[AC_CACHE_CHECK([what readdir sets errno to upon EOF], fptools_cv_readdir_eof_errno,
+[AC_TRY_RUN([#include <dirent.h>
+#include <stdio.h>
+#include <errno.h>
+int
+main(argc, argv)
+int argc;
+char **argv;
+{
+  FILE *f=fopen("conftestval", "w");
+#if defined(__MINGW32__)
+  int fd = mkdir("testdir");
+#else
+  int fd = mkdir("testdir", 0666);
+#endif
+  DIR* dp;
+  struct dirent* de;
+  int err = 0;
+
+  if (!f) return 1;
+  if (fd == -1) { 
+     fprintf(stderr,"unable to create directory; quitting.\n");
+     return 1;
+  }
+  close(fd);
+  dp = opendir("testdir");
+  if (!dp) { 
+     fprintf(stderr,"unable to browse directory; quitting.\n");
+     rmdir("testdir");
+     return 1;
+  }
+
+  /* the assumption here is that readdir() will only return NULL
+   * due to reaching the end of the directory.
+   */
+  while (de = readdir(dp)) {
+  	;
+  }
+  err = errno;
+  fprintf(f,"%d", err);
+  fclose(f);
+  closedir(de);
+  rmdir("testdir");
+  return 0;
+}],fptools_cv_readdir_eof_errno=`cat conftestval`, fptools_cv_readdir_eof_errno=bogus, fptools_cv_readdir_eof_errno=0)])
+dnl the cross value is somewhat bogus.
+AC_DEFINE_UNQUOTED([READDIR_ERRNO_EOF], [$fptools_cv_readdir_eof_errno], [readdir() sets errno to this upon EOF])
+])
+
+dnl @synopsis FP_DIRENT_FLAT_LAYOUT
+dnl
+dnl Check whether 'struct dirent' (in dirent.h) has d_name defined
+dnl as being the final field in a struct, or a pointer to somewhere
+dnl else. The former is the standardly thing to do, but mingw defns
+dnl have for the longest time gone for the latter. They no longer do,
+dnl hence the need to configure test for this.
+dnl
+dnl
+AC_DEFUN(FP_DIRENT_FLAT_LAYOUT,
+[AC_CACHE_CHECK([if struct dirent layout is flat], fptools_cv_dirent_flat_layout,
+[AC_TRY_RUN([#include <dirent.h>
+#include <stdio.h>
+#include <string.h>
+int
+main(argc, argv)
+int argc;
+char **argv;
+{
+  struct dirent de;
+  /*
+   * Check whether d_name is defined as
+   *    struct dirent { .... ; char d_name[..]; } 
+   * or
+   *    struct dirent { .... ; char* d_name; } 
+   * 
+   * Returns 0 if the former.
+   */
+  memset(&de,0,sizeof(struct dirent));
+  return ((int)de.d_name == 0);
+}],fptools_cv_dirent_flat_layout=yes, fptools_cv_dirent_flat_layout=no, fptools_cv_dirent_flat_layout=yes)])
+dnl the cross value is somewhat bogus.
+if test "$fptools_cv_dirent_flat_layout" = yes; then
+AC_DEFINE([STRUCT_DIRENT_FLAT_LAYOUT], [1], [Define to 1 if struct dirent is a flat structure])
+fi
+])