mark all functions in headers with VIS_EXPORT or VIS_INTERNAL

if vis actually wants to be a library exported symbols may need
mark up depending on the platform (eg. __declspec(dllexport)).
This needs to be hidden behind a macro because the way you export
is not the same on every platform.

I did this based on the assumption that vis.h was supposed to be
the only interface to the "vis" library. Since nobody actually
uses vis as a library I have no idea if this is actually correct.

Anyway marking up all prototypes like this allows for one to
convert all functions to static if a single translation unit is
used by inserting at the start:

 #define VIS_INTERNAL static
 #define VIS_EXPORT   static

1 files changed, 3 insertions, 1 deletions

diff --git a/sam.c b/sam.c
index 0f9810d..2d6e634 100644
--- a/sam.c
+++ b/sam.c
@@ -24,6 +24,9 @@
 #include <unistd.h>
 #include <limits.h>
 #include <fcntl.h>
+
+#include "util.h"
+
 #include "sam.h"
 #include "vis-core.h"
 #include "buffer.h"
@@ -31,7 +34,6 @@
 #include "text-motions.h"
 #include "text-objects.h"
 #include "text-regex.h"
-#include "util.h"
 
 #define MAX_ARGV 8