From 292d101ed3b8a0b3d79d45af48feccba827c0942 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Thu, 24 Nov 2022 17:34:21 -0500
Subject: Always handle the return value of serd_env_set_base_uri()

---
 src/env.c       |  7 +++++--
 src/writer.c    | 29 +++++++++++++++--------------
 test/test_env.c |  2 ++
 3 files changed, 22 insertions(+), 16 deletions(-)

diff --git a/src/env.c b/src/env.c
index 97bccfba..9a3d2ea5 100644
--- a/src/env.c
+++ b/src/env.c
@@ -25,8 +25,11 @@ SerdEnv*
 serd_env_new(const SerdNode* const base_uri)
 {
   SerdEnv* env = (SerdEnv*)calloc(1, sizeof(struct SerdEnvImpl));
-  if (env && base_uri) {
-    serd_env_set_base_uri(env, base_uri);
+  if (env && base_uri && base_uri->type != SERD_NOTHING) {
+    if (serd_env_set_base_uri(env, base_uri)) {
+      free(env);
+      return NULL;
+    }
   }
 
   return env;
diff --git a/src/writer.c b/src/writer.c
index 26ed01c0..d2609cf5 100644
--- a/src/writer.c
+++ b/src/writer.c
@@ -1010,23 +1010,24 @@ serd_writer_chop_blank_prefix(SerdWriter* writer, const uint8_t* prefix)
 SerdStatus
 serd_writer_set_base_uri(SerdWriter* writer, const SerdNode* uri)
 {
-  if (!serd_env_set_base_uri(writer->env, uri)) {
-    serd_env_get_base_uri(writer->env, &writer->base_uri);
+  const SerdStatus st = serd_env_set_base_uri(writer->env, uri);
+  if (st) {
+    return st;
+  }
 
-    if (writer->syntax == SERD_TURTLE || writer->syntax == SERD_TRIG) {
-      if (writer->context.graph.type || writer->context.subject.type) {
-        sink(" .\n\n", 4, writer);
-        reset_context(writer, true);
-      }
-      sink("@base <", 7, writer);
-      sink(uri->buf, uri->n_bytes, writer);
-      sink("> .\n", 4, writer);
+  serd_env_get_base_uri(writer->env, &writer->base_uri);
+
+  if (writer->syntax == SERD_TURTLE || writer->syntax == SERD_TRIG) {
+    if (writer->context.graph.type || writer->context.subject.type) {
+      sink(" .\n\n", 4, writer);
+      reset_context(writer, true);
     }
-    writer->indent = 0;
-    return reset_context(writer, true);
+    sink("@base <", 7, writer);
+    sink(uri->buf, uri->n_bytes, writer);
+    sink("> .\n", 4, writer);
   }
-
-  return SERD_ERR_UNKNOWN;
+  writer->indent = 0;
+  return reset_context(writer, true);
 }
 
 SerdStatus
diff --git a/test/test_env.c b/test/test_env.c
index dd8660dc..1de075f3 100644
--- a/test/test_env.c
+++ b/test/test_env.c
@@ -64,6 +64,8 @@ test_env(void)
   const SerdNode lit = serd_node_from_string(SERD_LITERAL, USTR("hello"));
   assert(serd_env_set_prefix(env, &b, &lit));
 
+  assert(!serd_env_new(&lit));
+
   const SerdNode blank  = serd_node_from_string(SERD_BLANK, USTR("b1"));
   const SerdNode xblank = serd_env_expand_node(env, &blank);
   assert(serd_node_equals(&xblank, &SERD_NODE_NULL));
-- 
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