test: Use nullptr in C++ code. (#1744)

src/test-ot-color.cc

@@ -133,7 +133,7 @@ layered_glyph_dump (hb_face_t *face, cairo_font_face_t *cairo_face, unsigned int
   unsigned glyph_count = hb_face_get_glyph_count (face);
   for (hb_codepoint_t gid = 0; gid < glyph_count; ++gid)
   {
-    unsigned int num_layers = hb_ot_color_glyph_get_layers (face, gid, 0, NULL, NULL);
+    unsigned int num_layers = hb_ot_color_glyph_get_layers (face, gid, 0, nullptr, nullptr);
     if (!num_layers)
       continue;
 
@@ -169,7 +169,7 @@ layered_glyph_dump (hb_face_t *face, cairo_font_face_t *cairo_face, unsigned int
       unsigned int palette_count = hb_ot_color_palette_get_count (face);
       for (unsigned int palette = 0; palette < palette_count; palette++)
       {
-	unsigned int num_colors = hb_ot_color_palette_get_colors (face, palette, 0, NULL, NULL);
+	unsigned int num_colors = hb_ot_color_palette_get_colors (face, palette, 0, nullptr, nullptr);
 	if (!num_colors)
 	  continue;
 
@@ -271,14 +271,14 @@ main (int argc, char **argv)
 
 
   FILE *font_name_file = fopen ("out/.dumped_font_name", "r");
-  if (font_name_file != NULL)
+  if (font_name_file != nullptr)
   {
     fprintf (stderr, "Purge or move ./out folder in order to run a new dump\n");
     exit (1);
   }
 
   font_name_file = fopen ("out/.dumped_font_name", "w");
-  if (font_name_file == NULL)
+  if (font_name_file == nullptr)
   {
     fprintf (stderr, "./out is not accessible as a folder, create it please\n");
     exit (1);

test/fuzzing/hb-shape-fuzzer.cc

@@ -10,7 +10,7 @@
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 {
   hb_blob_t *blob = hb_blob_create ((const char *)data, size,
-				    HB_MEMORY_MODE_READONLY, NULL, NULL);
+				    HB_MEMORY_MODE_READONLY, nullptr, nullptr);
   hb_face_t *face = hb_face_create (blob, 0);
   hb_font_t *font = hb_font_create (face);
   hb_ot_font_set_funcs (font);
@@ -21,7 +21,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
     hb_buffer_t *buffer = hb_buffer_create ();
     hb_buffer_add_utf8 (buffer, text, -1, 0, -1);
     hb_buffer_guess_segment_properties (buffer);
-    hb_shape (font, buffer, NULL, 0);
+    hb_shape (font, buffer, nullptr, 0);
     hb_buffer_destroy (buffer);
   }
 
@@ -34,7 +34,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
   hb_buffer_t *buffer = hb_buffer_create ();
   hb_buffer_add_utf32 (buffer, text32, sizeof (text32) / sizeof (text32[0]), 0, -1);
   hb_buffer_guess_segment_properties (buffer);
-  hb_shape (font, buffer, NULL, 0);
+  hb_shape (font, buffer, nullptr, 0);
   hb_buffer_destroy (buffer);
 
   /* Misc calls on face. */

test/fuzzing/hb-subset-fuzzer.cc

@@ -53,7 +53,7 @@ trySubset (hb_face_t *face,
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 {
   hb_blob_t *blob = hb_blob_create ((const char *)data, size,
-				    HB_MEMORY_MODE_READONLY, NULL, NULL);
+				    HB_MEMORY_MODE_READONLY, nullptr, nullptr);
   hb_face_t *face = hb_face_create (blob, 0);
 
   /* Just test this API here quickly. */

util/options-subset.cc

@@ -115,7 +115,7 @@ parse_drop_tables (const char *name,
     else
       hb_set_del (drop_tables, tag);
 
-    s = strtok(NULL, ", ");
+    s = strtok(nullptr, ", ");
   }
 
   return true;