common: added bc_slist_sort

2 files changed, 62 insertions, 0 deletions

diff --git a/src/common/sort.c b/src/common/sort.c
new file mode 100644
index 0000000..3e24706
--- /dev/null
+++ b/src/common/sort.c
@@ -0,0 +1,44 @@
+/*
+ * blogc: A blog compiler.
+ * Copyright (C) 2014-2019 Rafael G. Martins <rafael@rafaelmartins.eng.br>
+ *
+ * This program can be distributed under the terms of the BSD License.
+ * See the file LICENSE.
+ */
+
+#include <stdbool.h>
+#include "utils.h"
+#include "sort.h"
+
+
+bc_slist_t*
+bc_slist_sort(bc_slist_t *l, bc_sort_func_t cmp)
+{
+    if (l == NULL) {
+        return NULL;
+    }
+
+    bool swapped = false;
+    bc_slist_t *lptr = NULL;
+    bc_slist_t *rptr = NULL;
+
+    do {
+        swapped = false;
+        lptr = l;
+
+        while (lptr->next != rptr) {
+            if (0 < cmp(lptr->data, lptr->next->data)) {
+                void *tmp = lptr->data;
+                lptr->data = lptr->next->data;
+                lptr->next->data = tmp;
+                swapped = true;
+            }
+
+            lptr = lptr->next;
+        }
+
+        rptr = lptr;
+    } while(swapped);
+
+    return l;
+}
diff --git a/src/common/sort.h b/src/common/sort.h
new file mode 100644
index 0000000..9f4dda2
--- /dev/null
+++ b/src/common/sort.h
@@ -0,0 +1,18 @@
+/*
+ * blogc: A blog compiler.
+ * Copyright (C) 2014-2019 Rafael G. Martins <rafael@rafaelmartins.eng.br>
+ *
+ * This program can be distributed under the terms of the BSD License.
+ * See the file LICENSE.
+ */
+
+#ifndef _SORT_H
+#define _SORT_H
+
+#include "utils.h"
+
+typedef int (*bc_sort_func_t) (const void *a, const void *b);
+
+bc_slist_t* bc_slist_sort(bc_slist_t *l, bc_sort_func_t cmp);
+
+#endif /* _SORT_H */