tighten scope in libidu/, too

Mark with "extern" the symbols that belong that way.
Make the others static.
* libidu/dynvec.h (dv_fill):
* libidu/fnprint.c (cw_dlink):
* libidu/hash.h (qsort_cmp_t):
* libidu/idfile.h (io_func_t):
* libidu/scanners.c (lang_args_obstack, languages_0, languages_N):
(language_help_me, language_getopt, get_language):
(lang_args_index):
* libidu/walker.c (largest_member_file):
* maint.mk (extract_char, today):
* src/fid.c (long_options):
* src/fnid.c (cw_dlink):
* src/lid.c (cw_dlink):
* src/xtokid.c (cw_dlink):

4 files changed, 5 insertions, 4 deletions

diff --git a/src/fid.c b/src/fid.c
index 9869075..45c6853 100644
--- a/src/fid.c
+++ b/src/fid.c
@@ -60,7 +60,7 @@ static struct file_link **members_0;
 static unsigned int bits_vec_size;
 static char *hits_buf;
 
-static struct option const long_options[] =
+static const struct option const long_options[] =
 {
   { "file", required_argument, 0, 'f' },
   { "help", no_argument, &show_help, 1 },
diff --git a/src/fnid.c b/src/fnid.c
index 0dbf269..d20c543 100644
--- a/src/fnid.c
+++ b/src/fnid.c
@@ -38,8 +38,9 @@ void usage (void);
 char const *program_name;
 static int show_version = 0;
 static int show_help = 0;
+static struct file_link *cw_dlink;
+
 struct idhead idh;
-struct file_link *cw_dlink;
 
 /* How shall we separate file names?  */
 
diff --git a/src/lid.c b/src/lid.c
index 4ca37a3..d7c3770 100644
--- a/src/lid.c
+++ b/src/lid.c
@@ -209,7 +209,7 @@ static query_func_t query_function;
 static unsigned int frequency_low = 1;
 static unsigned int frequency_high = USHRT_MAX;
 
-struct file_link *cw_dlink;
+static struct file_link *cw_dlink;
 static struct file_link **members_0;
 
 static struct option const long_options[] =
diff --git a/src/xtokid.c b/src/xtokid.c
index 1e5768e..5dc97fe 100644
--- a/src/xtokid.c
+++ b/src/xtokid.c
@@ -40,7 +40,7 @@ static char *lang_map_file_name = 0;
 static int show_version = 0;
 static int show_help = 0;
 struct idhead idh;
-struct file_link *cw_dlink;
+static struct file_link *cw_dlink;
 
 void
 usage (void)