share more code between the C examplesHEADmaster

1 files changed, 20 insertions, 0 deletions

diff --git a/c/libdietc.l b/c/libdietc.l
index 51c8e91..abdb914 100644
--- a/c/libdietc.l
+++ b/c/libdietc.l
@@ -280,3 +280,23 @@ struct type *libdietc_lhs_type(struct program program, struct instruction *instr
     name = libdietc_tokdup(libdietc_nth_token(instruction->line, 0));
     return libdietc_object_type(program, name);
 }
+
+struct instruction *libdietc_insert_before(struct instruction *i, char *line) {
+    struct instruction *new = calloc(1, sizeof(*new));
+    *(i->pprev) = new;
+    new->pprev = i->pprev;
+    new->line = line;
+    new->next = i;
+    i->pprev = &(new->next);
+    return new;
+}
+
+struct instruction *libdietc_insert_after(struct instruction *i, char *line) {
+    struct instruction *new = calloc(1, sizeof(*new));
+    new->line = line;
+    new->next = i->next;
+    i->next->pprev = &(new->next);
+    new->pprev = &(i->next);
+    i->next = new;
+    return new;
+}