From f36272b66fdb2b2a2a6153935d7d134ca5a76b9a Mon Sep 17 00:00:00 2001
From: Milo Turner <iitalics@gmail.com>
Date: Fri, 7 Feb 2020 17:32:41 -0500
Subject: [PATCH] [ctxt] ax_ctxt basics

---
 src/ctxt.h      | 23 +++++++++++++++++++++++
 src/ctxt/ctxt.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 test/main.c     | 22 +++++++---------------
 3 files changed, 75 insertions(+), 15 deletions(-)
 create mode 100644 src/ctxt.h
 create mode 100644 src/ctxt/ctxt.c

diff --git a/src/ctxt.h b/src/ctxt.h
new file mode 100644
index 0000000..26d9800
--- /dev/null
+++ b/src/ctxt.h
@@ -0,0 +1,23 @@
+#pragma once
+
+#include "util/region.h"
+
+struct ax_ctxt {
+    struct rgn* self_rgn;
+    struct rgn err_rgn;
+    char* err;
+};
+
+void ax__ctxt_init(struct ax_ctxt* ax, struct rgn* self_rgn);
+void ax__ctxt_cleanup(struct ax_ctxt* ax);
+
+static inline char* ax__make_error_buf(struct ax_ctxt* ax, size_t n)
+{
+    rgn_clear(&ax->err_rgn);
+    return (ax->err = ralloc_typed(&ax->err_rgn, char, n));
+}
+
+static inline void ax__set_error(struct ax_ctxt* ax, const char* text)
+{
+    strcpy(ax__make_error_buf(ax, strlen(text) + 1), text);
+}
diff --git a/src/ctxt/ctxt.c b/src/ctxt/ctxt.c
new file mode 100644
index 0000000..ddf9879
--- /dev/null
+++ b/src/ctxt/ctxt.c
@@ -0,0 +1,45 @@
+#include "../ctxt.h"
+#include "../ax.h"
+
+/* -----------------------------------------------------------------------------
+ * API functions
+ * -------------------------------------------------------------------------- */
+
+struct ax_ctxt* ax_new(void)
+{
+    // "bootstrap" a new region
+    struct rgn rgn0;
+    rgn_init(&rgn0, SMALL);
+    struct rgn* rgn = rmemdup_typed(&rgn0, struct rgn, &rgn0, 1);
+    // use it to make a new context
+    struct ax_ctxt* ax = ralloc_typed(rgn, struct ax_ctxt, 1);
+    ax__ctxt_init(ax, rgn);
+    return ax;
+}
+
+void ax_free(struct ax_ctxt* ax)
+{
+    ax__ctxt_cleanup(ax);
+    rgn_cleanup(ax->self_rgn);
+}
+
+const char* ax_get_error(struct ax_ctxt* ax)
+{
+    return ax->err;
+}
+
+/* -----------------------------------------------------------------------------
+ * Internal 'ax_ctxt' operations
+ * -------------------------------------------------------------------------- */
+
+void ax__ctxt_init(struct ax_ctxt* ax, struct rgn* self_rgn)
+{
+    ax->self_rgn = self_rgn;
+    rgn_init(&ax->err_rgn, SMALL);
+    ax->err = "";
+}
+
+void ax__ctxt_cleanup(struct ax_ctxt* ax)
+{
+    rgn_cleanup(&ax->err_rgn);
+}
diff --git a/test/main.c b/test/main.c
index bfd749b..53daea7 100644
--- a/test/main.c
+++ b/test/main.c
@@ -1,21 +1,13 @@
-#include "../src/region.h"
 #include <stdio.h>
+#include "../src/ax.h"
+#include "../src/ctxt.h"
+
 
 int main(void)
 {
-    struct rgn rgn[1];
-    rgn_init(rgn, SMALL);
-
-    for (int j = 0; j < 4; j++) {
-        for (int i = 0; i < 30; i++) {
-            char test[100];
-            memset(test, 'A', 99);
-            test[99] = '\0';
-            printf("%d; %p\n", j, rstrdup(rgn, test));
-        }
-        rgn_clear(rgn);
-    }
-
-    rgn_cleanup(rgn);
+    struct ax_ctxt* ax = ax_new();
+    ax__set_error(ax, "hello world");
+    printf("--> %s\n", ax_get_error(ax));
+    ax_free(ax);
     return 0;
 }