From b098e5225ae2fe7d99b3f99bb5aebcefd9731f96 Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Sat, 19 Dec 2020 18:42:13 -0800
Subject: Extra safety

---
 file_loader.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/file_loader.c b/file_loader.c
index ab677a1..72cea72 100644
--- a/file_loader.c
+++ b/file_loader.c
@@ -135,6 +135,10 @@ const char *get_line(file_t *f, size_t line_number)
 
 void fprint_line(FILE *dest, file_t *f, const char *start, const char *end, const char *fmt, ...)
 {
+    if (start < f->contents) start = f->contents;
+    if (start > f->end) start = f->end;
+    if (end < f->contents) end = f->contents;
+    if (end > f->end) end = f->end;
     size_t linenum = get_line_number(f, start);
     const char *line = get_line(f, linenum);
     size_t charnum = get_char_number(f, start);
-- 
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