cleanups and more test cases

src/lib/utils/labellist.c

@@ -0,0 +1,99 @@
+#include <string.h>
+#include "labellist.h"
+
+typedef struct LabelInfo LabelInfo;
+struct LabelInfo {
+    const char *name;
+    size_t  name_len;
+    Promise *promise;
+    LabelInfo  *next;
+};
+
+struct LabelList {
+    BPAlloc *alloc;
+    LabelInfo *head;
+};
+
+LabelList *LabelList_New(BPAlloc *alloc)
+{
+    LabelList *list = BPAlloc_Malloc(alloc, sizeof(LabelList));
+    if(list != NULL) {
+        list->head = NULL;
+        list->alloc = alloc;
+    }
+    return list;
+}
+
+void LabelList_Free(LabelList *list)
+{
+    LabelInfo *info = list->head;
+    while(info != NULL) {
+        Promise_Free(info->promise);
+        info = info->next;
+    }
+    list->head = NULL;
+}
+
+bool LabelList_SetLabel(LabelList *list, const char *name, size_t name_len, long long int value)
+{
+    Promise *promise = LabelList_GetLabel(list, name, name_len);
+    if(promise == NULL)
+        return false;
+    Promise_Resolve(promise, &value, sizeof(value));
+    return true;
+}
+
+Promise *LabelList_GetLabel(LabelList *list, const char *name, size_t name_len)
+{
+    // Find the label with the given name.
+    {
+        LabelInfo *info = list->head;
+        while(info != NULL) {
+            
+            if(name_len == info->name_len 
+                && strncmp(name, info->name, name_len) == 0)
+                return info->promise;
+
+            info = info->next;
+        }
+    }
+
+    // No such label. Create a new one.
+    LabelInfo *new_info;
+    {
+        BPAlloc *alloc = list->alloc;
+        Promise *promise = Promise_New(alloc, sizeof(long long int));
+        if(promise == NULL)\
+            return NULL;
+
+        new_info = BPAlloc_Malloc(alloc, sizeof(LabelInfo));
+        if(new_info == NULL) {
+            Promise_Free(promise);
+            return NULL;
+        }
+
+        new_info->next = NULL;
+        new_info->name = name;
+        new_info->name_len = name_len;
+        new_info->promise = promise;
+    }
+
+    // Add it to the list
+    new_info->next = list->head;
+    list->head = new_info;
+
+    return new_info->promise;
+}
+
+size_t LabelList_GetUnresolvedCount(LabelList *list)
+{
+    size_t count = 0;
+
+    LabelInfo *info = list->head;
+    while(info != NULL) {
+        count += !Promise_hasResolved(info->promise);
+        info = info->next;
+    }
+    
+    return count;
+}