[waffle] [PATCH 02/11] core: Define intptr_t variants of wcore_attrib_list functions

[Chad Versace]

When designing the original Waffle 1.0 API, I made a mistake when
I chose to declare attribute lists as arrays of int32_t. Instead, they
should have been arrays of intptr_t.

A new public function, waffle_window_create2, will have a `const
intptr_t attrib_list[]` parameter. Therefore waffle needs intptr_t
variants of the wcore_attrib_list functions.

Signed-off-by: Chad Versace <chad.versace at linux.intel.com>
---
 src/waffle/core/wcore_attrib_list.c | 73 +++++++++++++++++++++++++++++++++++++
 src/waffle/core/wcore_attrib_list.h | 23 ++++++++++++
 2 files changed, 96 insertions(+)

diff --git a/src/waffle/core/wcore_attrib_list.c b/src/waffle/core/wcore_attrib_list.c
index 09a4dec..a7f087d 100644
--- a/src/waffle/core/wcore_attrib_list.c
+++ b/src/waffle/core/wcore_attrib_list.c
@@ -29,6 +29,79 @@
 #include <stdint.h>
 #include <stddef.h>
 
+size_t
+wcore_attrib_list_length(const intptr_t attrib_list[])
+{
+    const intptr_t *i = attrib_list;
+
+    if (attrib_list == NULL)
+        return 0;
+
+    while (*i != 0)
+        i += 2;
+
+    return (i - attrib_list) / 2;
+}
+
+bool
+wcore_attrib_list_get(
+        const intptr_t *attrib_list,
+        intptr_t key,
+        intptr_t *value)
+{
+    if (attrib_list == NULL)
+        return false;
+
+    for (size_t i = 0; attrib_list[i] != 0; i += 2) {
+        if (attrib_list[i] != key)
+            continue;
+
+        *value = attrib_list[i + 1];
+        return true;
+    }
+
+    return false;
+}
+
+bool
+wcore_attrib_list_get_with_default(
+        const intptr_t attrib_list[],
+        intptr_t key,
+        intptr_t *value,
+        intptr_t default_value)
+{
+    if (wcore_attrib_list_get(attrib_list, key, value)) {
+        return true;
+    }
+    else {
+        *value = default_value;
+        return false;
+    }
+}
+
+bool
+wcore_attrib_list_update(
+        intptr_t *attrib_list,
+        intptr_t key,
+        intptr_t value)
+{
+    intptr_t *i = attrib_list;
+
+    if (attrib_list == NULL)
+        return false;
+
+    while (*i != 0 && *i != key)
+        i += 2;
+
+    if (*i == key) {
+        i[1] = value;
+        return true;
+    }
+    else {
+        return false;
+    }
+}
+
 int32_t
 wcore_attrib_list32_length(const int32_t attrib_list[])
 {
diff --git a/src/waffle/core/wcore_attrib_list.h b/src/waffle/core/wcore_attrib_list.h
index 8339578..5e6473b 100644
--- a/src/waffle/core/wcore_attrib_list.h
+++ b/src/waffle/core/wcore_attrib_list.h
@@ -27,6 +27,29 @@
 
 #include <stdbool.h>
 #include <stdint.h>
+#include <stdlib.h>
+
+size_t
+wcore_attrib_list_length(const intptr_t attrib_list[]);
+
+bool
+wcore_attrib_list_get(
+        const intptr_t *attrib_list,
+        intptr_t key,
+        intptr_t *value);
+
+bool
+wcore_attrib_list_get_with_default(
+        const intptr_t attrib_list[],
+        intptr_t key,
+        intptr_t *value,
+        intptr_t default_value);
+
+bool
+wcore_attrib_list_update(
+        intptr_t *attrib_list,
+        intptr_t key,
+        intptr_t value);
 
 int32_t
 wcore_attrib_list32_length(const int32_t attrib_list[]);
-- 
2.2.0