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, 8 insertions, 8 deletions

diff --git a/text-util.h b/text-util.h
index 85bfa04..922bab3 100644
--- a/text-util.h
+++ b/text-util.h
@@ -12,20 +12,20 @@
 /* create an empty / invalid range of size zero */
 #define text_range_empty() (Filerange){.start = EPOS, .end = EPOS}
 /* merge two ranges into a new one which contains both of them */
-Filerange text_range_union(const Filerange*, const Filerange*);
+VIS_INTERNAL Filerange text_range_union(const Filerange*, const Filerange*);
 /* get intersection of two ranges */
-Filerange text_range_intersect(const Filerange*, const Filerange*);
+VIS_INTERNAL Filerange text_range_intersect(const Filerange*, const Filerange*);
 /* create new range [min(a,b), max(a,b)] */
-Filerange text_range_new(size_t a, size_t b);
+VIS_INTERNAL Filerange text_range_new(size_t a, size_t b);
 /* test whether two ranges are equal */
-bool text_range_equal(const Filerange*, const Filerange*);
+VIS_INTERNAL bool text_range_equal(const Filerange*, const Filerange*);
 /* test whether two ranges overlap */
-bool text_range_overlap(const Filerange*, const Filerange*);
+VIS_INTERNAL bool text_range_overlap(const Filerange*, const Filerange*);
 /* test whether a given position is within a certain range */
-bool text_range_contains(const Filerange*, size_t pos);
+VIS_INTERNAL bool text_range_contains(const Filerange*, size_t pos);
 /* count the number of graphemes in data */
-int text_char_count(const char *data, size_t len);
+VIS_INTERNAL int text_char_count(const char *data, size_t len);
 /* get the approximate display width of data */
-int text_string_width(const char *data, size_t len);
+VIS_INTERNAL int text_string_width(const char *data, size_t len);
 
 #endif