Initial push

data.c

@@ -0,0 +1,66 @@
+#include "data.h"
+
+#include <string.h>
+
+struct tuple *find(string key, struct tuple *tuples, size_t n_tuples) {
+    for (size_t i = 0; i < n_tuples; i += 1) {
+        // compare keys with 'strcmp'
+        if (tuples[i].key && strcmp(key, tuples[i].key) == 0) {
+            return &(tuples[i]);
+        }
+    }
+    return NULL;
+}
+
+const char *get(const string key, struct tuple *tuples, size_t n_tuples,
+                size_t *value_length) {
+    struct tuple *tuple = find(key, tuples, n_tuples);
+    if (tuple) {
+        *value_length = tuple->value_length;
+        return tuple->value;
+    } else {
+        return NULL;
+    }
+}
+
+bool set(const string key, char *value, size_t value_length,
+         struct tuple *tuples, size_t n_tuples) {
+    // check if tuple already exists
+    struct tuple *tuple = find(key, tuples, n_tuples);
+
+    if (tuple) { // overwrite existing value
+        free(tuple->value);
+        tuple->value = (char *)malloc(value_length * sizeof(char));
+        strcpy(tuple->value, value);
+        tuple->value_length = value_length;
+        return true;
+    } else { // add tuple
+        for (size_t i = 0; i < n_tuples; i += 1) {
+            if (tuples[i].key == NULL) {
+                tuples[i].key =
+                    (char *)malloc((strlen(key) + 1) * sizeof(char));
+                strcpy(tuples[i].key, key);
+                tuples[i].value = (char *)malloc(value_length * sizeof(char));
+                memcpy(tuples[i].value, value, value_length);
+                tuples[i].value_length = value_length;
+                return false;
+            }
+        }
+    }
+    return false; // fail silently if no space for a new tuple is available
+}
+
+bool delete (const string key, struct tuple *tuples, size_t n_tuples) {
+    struct tuple *tuple = find(key, tuples, n_tuples);
+
+    if (tuple) {
+        free(tuple->key);
+        tuple->key = NULL;
+        free(tuple->value);
+        tuple->value = NULL;
+        tuple->value_length = 0;
+        return true;
+    } else {
+        return false;
+    }
+}