implemented automatic EOL translation support

 * activated via bit 4 of the ED flag (enabled by default)
 * automatic EOL guessing on file loading and translation to LFs.
   * works with files that have inconsistent EOL sequences.
 * automatic translation to original EOL sequences on file saving
   * works with inconsistent EOL sequences in the buffer.
     This should usually not happen if the file was read in with
     automatic EOL translation enabled.
 * also works with the EC and EG commands
 * performance is OK, depending on the file being translated.
   When reading files with UNIX EOLs, the overhead is minimal
   typically-sized files. For DOS EOLs the overhead is larger
   but still acceptable.
 * Return (line feed) is now an immediate editing command.
   This centralizes EOL sequence insertion.
   Later, other features like auto-indent could be added to
   the editing command.
 * get_eol() has been moved to main.cpp (now called
   get_eol_seq()
 * Warn if file ownership could not be preserved when
   saving files.
 * IOView has been almost completely rewritten based
   on GIOChannels. The EOL translation code is also in IOView.

1 files changed, 11 insertions, 3 deletions

diff --git a/configure.ac b/configure.ac
index 4e85cc5..c0402a9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -102,11 +102,19 @@ AC_C_INLINE
 AC_TYPE_SIZE_T
 
 # Checks for library functions.
-AC_CHECK_FUNCS([memset setlocale strchr strrchr])
+# They must exist on every target system.
+AC_FUNC_MALLOC
+AC_FUNC_REALLOC
+AC_CHECK_FUNCS([memset setlocale strchr strrchr fstat], , [
+	AC_MSG_ERROR([Missing libc function])
+])
 
+# Library functions that should exist on UNIX/Linux
 case $host in
-*-*-linux*)
-	AC_CHECK_FUNC([realpath])
+*-*-darwin* | *-*-linux* | *-*-cygwin*)
+	AC_CHECK_FUNCS([realpath fchown], , [
+		AC_MSG_ERROR([Missing libc function])
+	])
 	;;
 esac