Signal handling cleanup and improved safety

Fixes issue where you couldn't control-C out of a loop (https://github.com/ridiculousfish/fishfish/issues/13)
Also stops doing memory allocation in the signal handler (oops) https://github.com/ridiculousfish/fishfish/issues/27

1 files changed, 21 insertions, 0 deletions

diff --git a/parser.cpp b/parser.cpp
index 1d91e5b3..f93dbf3a 100644
--- a/parser.cpp
+++ b/parser.cpp
@@ -371,14 +371,35 @@ parser_t::parser_t(enum parser_type_t type, bool errors) :
     
 }
 
+/* A pointer to the principal parser (which is a static local) */
+static parser_t *s_principal_parser = NULL;
+
 parser_t &parser_t::principal_parser(void)
 {
     ASSERT_IS_NOT_FORKED_CHILD();
     ASSERT_IS_MAIN_THREAD();
     static parser_t parser(PARSER_TYPE_GENERAL, true);
+    if (! s_principal_parser)
+    {
+        s_principal_parser = &parser;
+    }
     return parser;
 }
 
+void parser_t::skip_all_blocks(void)
+{
+    /* Tell all blocks to skip */
+    if (s_principal_parser)
+    {
+        block_t *c = s_principal_parser->current_block;
+        while( c )
+        {
+            c->skip = true;
+            c = c->outer;
+        }
+    }
+}
+
 /**
    Return the current number of block nestings
 */