From ab6e81997cf8c5bcf7d1778bb32d8e01425b13f1 Mon Sep 17 00:00:00 2001
From: "Rafael G. Martins" <rafael@rafaelmartins.eng.br>
Date: Thu, 22 Dec 2016 20:48:33 +0100
Subject: common: utils: added bc_slist_pop()

---
 src/common/utils.c         | 13 +++++++++++++
 src/common/utils.h         |  4 ++++
 tests/common/check_utils.c | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 50 insertions(+)

diff --git a/src/common/utils.c b/src/common/utils.c
index 97fa671..c78229d 100644
--- a/src/common/utils.c
+++ b/src/common/utils.c
@@ -105,6 +105,19 @@ bc_slist_length(bc_slist_t *l)
 }
 
 
+bc_slist_t*
+bc_slist_pop(bc_slist_t *l, void **data)
+{
+    if (l == NULL)
+        return l;
+    bc_slist_t *tmp = l;
+    l = l->next;
+    *data = tmp->data;
+    free(tmp);
+    return l;
+}
+
+
 char*
 bc_strdup(const char *s)
 {
diff --git a/src/common/utils.h b/src/common/utils.h
index b0388b3..811c593 100644
--- a/src/common/utils.h
+++ b/src/common/utils.h
@@ -35,6 +35,10 @@ void bc_slist_free(bc_slist_t *l);
 void bc_slist_free_full(bc_slist_t *l, bc_free_func_t free_func);
 size_t bc_slist_length(bc_slist_t *l);
 
+// here i'm just extending slist, instead of implementing a fully featuered
+// queue for the sake of simplicity
+bc_slist_t* bc_slist_pop(bc_slist_t *l, void **data);
+
 
 // strfuncs
 
diff --git a/tests/common/check_utils.c b/tests/common/check_utils.c
index dc1eadd..4a4ee2b 100644
--- a/tests/common/check_utils.c
+++ b/tests/common/check_utils.c
@@ -86,6 +86,38 @@ test_slist_length(void **state)
 }
 
 
+static void
+test_slist_pop(void **state)
+{
+    bc_slist_t *l = NULL;
+    l = bc_slist_append(l, (void*) bc_strdup("bola"));
+    l = bc_slist_append(l, (void*) bc_strdup("guda"));
+    l = bc_slist_append(l, (void*) bc_strdup("chula"));
+    char *v = NULL;
+    l = bc_slist_pop(l, &v);
+    assert_string_equal(v, "bola");
+    assert_non_null(l);
+    assert_string_equal(l->data, "guda");
+    assert_string_equal(l->next->data, "chula");
+    assert_null(l->next->next);
+    free(v);
+    l = bc_slist_pop(l, &v);
+    assert_string_equal(v, "guda");
+    assert_non_null(l);
+    assert_string_equal(l->data, "chula");
+    assert_null(l->next);
+    free(v);
+    l = bc_slist_pop(l, &v);
+    assert_string_equal(v, "chula");
+    assert_null(l);
+    free(v);
+    v = NULL;
+    l = bc_slist_pop(l, &v);
+    assert_null(v);
+    assert_null(l);
+}
+
+
 static void
 test_strdup(void **state)
 {
@@ -1026,6 +1058,7 @@ main(void)
         unit_test(test_slist_prepend),
         unit_test(test_slist_free),
         unit_test(test_slist_length),
+        unit_test(test_slist_pop),
 
         // strfuncs
         unit_test(test_strdup),
-- 
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