5 files changed, 32 insertions, 3 deletions

diff --git a/src/env.c b/src/env.c
index ffbccd3e..33077c0c 100644
--- a/src/env.c
+++ b/src/env.c
@@ -140,6 +140,8 @@ serd_env_set_prefix(SerdEnv* const        env,
                     const SerdNode* const uri)
 {
   assert(env);
+  assert(name);
+  assert(uri);
 
   if (!name->buf || uri->type != SERD_URI) {
     return SERD_ERR_BAD_ARG;
@@ -167,6 +169,10 @@ serd_env_set_prefix_from_strings(SerdEnv* const       env,
                                  const uint8_t* const name,
                                  const uint8_t* const uri)
 {
+  assert(env);
+  assert(name);
+  assert(uri);
+
   const SerdNode name_node = serd_node_from_string(SERD_LITERAL, name);
   const SerdNode uri_node  = serd_node_from_string(SERD_URI, uri);
 
@@ -179,6 +185,10 @@ serd_env_qualify(const SerdEnv* const  env,
                  SerdNode* const       prefix,
                  SerdChunk* const      suffix)
 {
+  assert(uri);
+  assert(prefix);
+  assert(suffix);
+
   if (!env) {
     return false;
   }
@@ -205,6 +215,10 @@ serd_env_expand(const SerdEnv* const  env,
                 SerdChunk* const      uri_prefix,
                 SerdChunk* const      uri_suffix)
 {
+  assert(curie);
+  assert(uri_prefix);
+  assert(uri_suffix);
+
   if (!env) {
     return SERD_ERR_BAD_CURIE;
   }
@@ -230,6 +244,8 @@ serd_env_expand(const SerdEnv* const  env,
 SerdNode
 serd_env_expand_node(const SerdEnv* const env, const SerdNode* const node)
 {
+  assert(node);
+
   if (!env) {
     return SERD_NODE_NULL;
   }
diff --git a/src/reader.c b/src/reader.c
index 1936808a..aa24a9ca 100644
--- a/src/reader.c
+++ b/src/reader.c
@@ -200,6 +200,7 @@ serd_reader_new(const SerdSyntax syntax,
 void
 serd_reader_set_strict(SerdReader* const reader, const bool strict)
 {
+  assert(reader);
   reader->strict = strict;
 }
 
@@ -208,6 +209,7 @@ serd_reader_set_error_sink(SerdReader* const   reader,
                            const SerdErrorSink error_sink,
                            void* const         error_handle)
 {
+  assert(reader);
   reader->error_sink   = error_sink;
   reader->error_handle = error_handle;
 }
@@ -392,6 +394,9 @@ serd_reader_read_file_handle(SerdReader* const    reader,
                              FILE* const          file,
                              const uint8_t* const name)
 {
+  assert(reader);
+  assert(file);
+
   return serd_reader_read_source(reader,
                                  (SerdSource)fread,
                                  (SerdStreamErrorFunc)ferror,
diff --git a/src/string.c b/src/string.c
index 52fb4a91..b2946aac 100644
--- a/src/string.c
+++ b/src/string.c
@@ -91,6 +91,8 @@ serd_strlen(const uint8_t* const str,
             size_t* const        n_bytes,
             SerdNodeFlags* const flags)
 {
+  assert(str);
+
   size_t        n_chars = 0;
   size_t        i       = 0;
   SerdNodeFlags f       = 0;
diff --git a/src/uri.c b/src/uri.c
index 443069ec..9856ce45 100644
--- a/src/uri.c
+++ b/src/uri.c
@@ -430,7 +430,6 @@ serd_uri_serialise_relative(const SerdURI* const uri,
 {
   assert(uri);
   assert(sink);
-  assert(stream);
 
   size_t     len = 0;
   const bool relative =
@@ -484,7 +483,7 @@ serd_uri_serialise_relative(const SerdURI* const uri,
 size_t
 serd_uri_serialise(const SerdURI* const uri, SerdSink sink, void* const stream)
 {
+  assert(uri);
   assert(sink);
-  assert(stream);
   return serd_uri_serialise_relative(uri, NULL, NULL, sink, stream);
 }
diff --git a/src/writer.c b/src/writer.c
index 58d7e64f..2b127d04 100644
--- a/src/writer.c
+++ b/src/writer.c
@@ -946,6 +946,9 @@ serd_writer_write_statement(SerdWriter*        writer,
                             const SerdNode*    lang)
 {
   assert(writer);
+  assert(subject);
+  assert(predicate);
+  assert(object);
 
   SerdStatus st = SERD_SUCCESS;
 
@@ -1145,7 +1148,7 @@ serd_writer_new(SerdSyntax     syntax,
                 void*          stream)
 {
   assert(env);
-  assert(sink);
+  assert(ssink);
 
   const WriteContext context = WRITE_CONTEXT_NULL;
   SerdWriter*        writer  = (SerdWriter*)calloc(1, sizeof(SerdWriter));
@@ -1239,6 +1242,10 @@ serd_writer_set_prefix(SerdWriter*     writer,
                        const SerdNode* name,
                        const SerdNode* uri)
 {
+  assert(writer);
+  assert(name);
+  assert(uri);
+
   SerdStatus st = SERD_SUCCESS;
 
   TRY(st, serd_env_set_prefix(writer->env, name, uri));