Solaris requires a buffer for realpath

src/zone.c

@@ -174,12 +174,14 @@ nonnull_all
 static int32_t resolve_path(
   const char *includer, const char *include, char **path)
 {
+  char *resolved;
+  char buffer[PATH_MAX + 1];
+
   if (*includer && *include != '/') {
     assert(*includer == '/');
     const char *separator = strrchr(includer, '/');
     if (separator - include > INT_MAX)
       return ZONE_OUT_OF_MEMORY;
-    char buffer[16];
     int offset = (int)(separator - includer);
     int length = snprintf(
       buffer, sizeof(buffer), "%.*s/%s", offset, includer, include);
@@ -190,15 +192,21 @@ static int32_t resolve_path(
       return ZONE_OUT_OF_MEMORY;
     (void)snprintf(
       absolute, (size_t)length + 1, "%.*s/%s", offset, includer, include);
-    *path = realpath(absolute, NULL);
+    resolved = realpath(absolute, buffer);
     free(absolute);
   } else {
-    *path = realpath(include, NULL);
+    resolved = realpath(include, buffer);
   }
 
-  if (*path)
-    return 0;
-  return (errno == ENOMEM) ? ZONE_OUT_OF_MEMORY : ZONE_NOT_A_FILE;
+  if (!resolved)
+    return (errno == ENOMEM) ? ZONE_OUT_OF_MEMORY : ZONE_NOT_A_FILE;
+  assert(resolved == buffer);
+  size_t length = strlen(buffer);
+  if (!(resolved = malloc(length + 1)))
+    return ZONE_OUT_OF_MEMORY;
+  memcpy(resolved, buffer, length + 1);
+  *path = resolved;
+  return 0;
 }
 #endif
 
@@ -276,6 +284,7 @@ static int32_t open_file(
 
   initialize_file(parser, file);
 
+  file->path = NULL;
   if (!(file->name = malloc(length + 1)))
     return ZONE_OUT_OF_MEMORY;
   memcpy(file->name, include, length);