Add an unsigned int/string pair type, modelled on the value string of

wireshark

src/val_str.c

@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <limits.h>
+#include "ucore/val_str.h"
+#include "ucore/saturating_math.h"
+
+
+const char *uc_vs_search(unsigned int val, const struct UCValStr *array)
+{
+    const char *found = NULL;
+
+    while (array->str) {
+        if (array->val == val) {
+            found = array->str;
+            break;
+        }
+        array++;
+    }
+
+    return found;
+}
+
+const char *uc_vs_bsearch(unsigned int val, 
+                                       const struct UCValStr *array,
+                                       size_t array_len)
+{
+    size_t i = array_len;
+    const struct UCValStr *start = array;
+
+    while (i != 0) {
+        const struct UCValStr *curr;
+        curr = start + i / 2;
+
+        if (curr->val == val) {
+            return curr->str;
+        }
+
+        if (curr->val < val) {
+            start = curr + 1;
+            i--;
+        }
+
+        i = i / 2;
+    }
+
+    return NULL;
+}
+