chore: libunicode -> libutf

1 files changed, 71 insertions, 0 deletions

diff --git a/sys/libutf/runewidth-14.0.0.c b/sys/libutf/runewidth-14.0.0.c
new file mode 100644
index 0000000..113c35e
--- /dev/null
+++ b/sys/libutf/runewidth-14.0.0.c
@@ -0,0 +1,71 @@
+#include <u.h>
+#include <libutf.h>
+
+static
+rune*
+rangesearch(rune c, rune *t, int n, int ne)
+{
+   rune *p;
+   int m;
+   while(n > 1) {
+   m = n >> 1;
+   p = t + m*ne;
+   if(c >= p[0]){
+       t = p;
+       n = n-m;
+   }else
+       n = m;
+   }
+   if(n && c >= t[0])
+       return t;
+   return 0;
+}
+
+static rune width0_range[] = {
+	0x2028, 0x2029,
+};
+
+static int
+iswidth0(rune c)
+{
+    rune *p;
+
+   p = rangesearch(c, width0_range, arrlen(width0_range)/2, 2);
+   if(p && c >= p[0] && c <= p[1])
+       return 1;
+   return 0;
+}
+
+static rune width1_single[] = {
+	0x00ad,
+};
+
+static int
+iswidth1(rune c)
+{
+    rune *p;
+
+   p = rangesearch(c, width1_single, arrlen(width1_single), 1);
+   if(p && c == p[0])
+       return 1;
+   return 0;
+}
+
+static int
+iswidth2(rune c)
+{
+    rune *p;
+
+   return 0;
+}
+
+
+int
+utf8·runewidth(rune c)
+{
+   if(iswidth1(c))
+       return 1;
+   if(iswidth2(c))
+       return 2;
+   return 0;
+}