Fixed some constness inconsistencies in lookup APIs.

Also check for NULL name in lookup functions.

3 files changed, 47 insertions, 5 deletions

diff --git a/doc/libconfig.texi b/doc/libconfig.texi
index cf0e434..24dc1f1 100644
--- a/doc/libconfig.texi
+++ b/doc/libconfig.texi
@@ -1075,6 +1075,15 @@ setting was not found.
 
 @end deftypefun
 
+@deftypefun {const config_setting_t *} config_lookup_const (@w{const config_t * @var{config}}, @w{const char * @var{path}})
+
+@b{Since @i{v1.7.4}}
+
+This function is identical to @code{config_lookup()}, except that the
+setting is returned as a @code{const} structure.
+
+@end deftypefun
+
 @deftypefun {config_setting_t *} config_setting_lookup (@w{const config_setting_t * @var{setting}}, @w{const char * @var{path}})
 
 This function locates a setting by a path @var{path} relative to
@@ -1084,6 +1093,15 @@ setting was not found.
 
 @end deftypefun
 
+@deftypefun {const config_setting_t *} config_setting_lookup_const (@w{const config_setting_t * @var{setting}}, @w{const char * @var{path}})
+
+@b{Since @i{v1.7.4}}
+
+This function is identical to @code{config_setting_lookup()}, except that the
+setting is returned as a @code{const} structure.
+
+@end deftypefun
+
 @deftypefun int config_setting_get_int (@w{const config_setting_t * @var{setting}})
 @deftypefunx {long long} config_setting_get_int64 (@w{const config_setting_t * @var{setting}})
 @deftypefunx double config_setting_get_float (@w{const config_setting_t * @var{setting}})
diff --git a/lib/libconfig.c b/lib/libconfig.c
index 2c84a9d..f6fefb8 100644
--- a/lib/libconfig.c
+++ b/lib/libconfig.c
@@ -1199,11 +1199,11 @@ unsigned short config_setting_get_format(const config_setting_t *setting)
 
 /* ------------------------------------------------------------------------- */
 
-config_setting_t *config_setting_lookup(config_setting_t *setting,
-                                        const char *path)
+const config_setting_t *config_setting_lookup_const(
+  const config_setting_t *setting, const char *path)
 {
   const char *p = path;
-  config_setting_t *found = setting;
+  const config_setting_t *found = setting;
 
   while(*p && found)
   {
@@ -1240,6 +1240,14 @@ config_setting_t *config_setting_lookup(config_setting_t *setting,
 
 /* ------------------------------------------------------------------------- */
 
+config_setting_t *config_setting_lookup(const config_setting_t *setting,
+                                        const char *path)
+{
+  return((config_setting_t *)config_setting_lookup_const(setting, path));
+}
+
+/* ------------------------------------------------------------------------- */
+
 config_setting_t *config_lookup(const config_t *config, const char *path)
 {
   return(config_setting_lookup(config->root, path));
@@ -1247,6 +1255,14 @@ config_setting_t *config_lookup(const config_t *config, const char *path)
 
 /* ------------------------------------------------------------------------- */
 
+const config_setting_t *config_lookup_const(const config_t *config,
+                                            const char *path)
+{
+  return(config_setting_lookup(config->root, path));
+}
+
+/* ------------------------------------------------------------------------- */
+
 int config_lookup_string(const config_t *config, const char *path,
                          const char **value)
 {
@@ -1554,6 +1570,9 @@ config_setting_t *config_setting_get_member(const config_setting_t *setting,
   if(setting->type != CONFIG_TYPE_GROUP)
     return(NULL);
 
+  if(!name)
+    return(NULL);
+
   return(__config_list_search(setting->value.list, name, strlen(name), NULL));
 }
 
@@ -1642,7 +1661,7 @@ int config_setting_remove(config_setting_t *parent, const char *name)
   const char *settingName;
   const char *lastFound;
 
-  if(! parent)
+  if(! parent || !name)
     return(CONFIG_FALSE);
 
   if(parent->type != CONFIG_TYPE_GROUP)
diff --git a/lib/libconfig.h b/lib/libconfig.h
index a67ce77..d8288da 100644
--- a/lib/libconfig.h
+++ b/lib/libconfig.h
@@ -306,8 +306,13 @@ extern LIBCONFIG_API void config_setting_set_hook(config_setting_t *setting,
 
 extern LIBCONFIG_API config_setting_t *config_lookup(const config_t *config,
                                                      const char *path);
+extern LIBCONFIG_API const config_setting_t *config_lookup_const(
+  const config_t *config, const char *path);
+  
 extern LIBCONFIG_API config_setting_t *config_setting_lookup(
-  config_setting_t *setting, const char *path);
+  const config_setting_t *setting, const char *path);
+extern LIBCONFIG_API const config_setting_t *config_setting_lookup_const(
+  const config_setting_t *setting, const char *path);
 
 extern LIBCONFIG_API int config_lookup_int(const config_t *config,
                                            const char *path, int *value);