Update Documentation

1 files changed, 71 insertions, 0 deletions

diff --git a/src/include/engine/utils.c b/src/include/engine/utils.c
new file mode 100644
index 0000000..909c123
--- /dev/null
+++ b/src/include/engine/utils.c
@@ -0,0 +1,71 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include "utils.h"
+
+static int delkey(tablist_t *, int, char *);
+
+void dellist(tablist_t *list)
+{
+  for (int i = 0; i < list[0].len; ++i) {
+    tablist_t *indexes = getkeys(list, i, NULL, 0);
+    for (int j = 0; indexes[0].tab[j].flag; ++j)
+      delkey(list, i, indexes[0].tab[j].key);
+    free(indexes);
+  }
+}
+
+int hash(char *key)
+{
+  unsigned long h = 5381;
+  for (int i = 0; i < strlen(key); ++i)
+    h = ((h << 5) + h) + key[i];
+  return h % TABLEN;
+}
+
+tablist_t *copytab(tablist_t *dst, tablist_t *src)
+{
+  if (dst == NULL)
+    return NULL;
+  dst[0].len = src[0].len;
+  for (int i = 0; i < src[0].len; ++i) {
+    for (int j = 0; j < TABLEN; ++j) {
+      dst[i].tab[j] = (tabidx_t) { NULL, 0, { 0 } };
+      if (src[i].tab[j].flag) {
+        switch (src[i].tab[j].flag) {
+          case 3:
+            dst[i].tab[j].value.str =
+              calloc(strlen(src[i].tab[j].value.str) + 1, sizeof(char));
+            strcpy(dst[i].tab[j].value.str, src[i].tab[j].value.str);
+            break;
+          default:
+            dst[i].tab[j].value = src[i].tab[j].value;
+            break;
+        }
+        dst[i].tab[j].flag = src[i].tab[j].flag;
+        dst[i].tab[j].key = calloc(strlen(src[i].tab[j].key) + 1, sizeof(char));
+        strcpy(dst[i].tab[j].key, src[i].tab[j].key);
+      }
+    }
+  }
+  return dst;
+}
+
+static int delkey(tablist_t *list, int id, char *key)
+{
+  int idx = hash(key);
+  if (list[id].tab[idx].key == NULL)
+    return 1;
+  while (strcmp(list[id].tab[idx].key, key) && idx < TABLEN)
+    idx++;
+  if (idx >= TABLEN)
+    return 2;
+  free(list[id].tab[idx].key);
+  list[id].tab[idx].key = NULL;
+  if (list[id].tab[idx].flag == 3) {
+    free(list[id].tab[idx].value.str);
+    list[id].tab[idx].value.str = NULL;
+  }
+  list[id].tab[idx].flag = 0;
+  return 0;
+}