From c695b53a759cb7209e4b15abaec365fa0049bdc4 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Thu, 2 Jan 2020 14:30:43 +0100
Subject: [PATCH] Issue 117: Skip first line if it starts with a shebang when
 loading files.

A file that starts with #! is going to be a syntax error anyway, so we
won't be changing the behavior of any other valid source files with this
fix.
---
 jsstate.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/jsstate.c b/jsstate.c
index 75b7842..2974336 100644
--- a/jsstate.c
+++ b/jsstate.c
@@ -130,7 +130,7 @@ void js_loadstring(js_State *J, const char *filename, const char *source)
 void js_loadfile(js_State *J, const char *filename)
 {
 	FILE *f;
-	char *s;
+	char *s, *p;
 	int n, t;
 
 	f = fopen(filename, "rb");
@@ -176,7 +176,15 @@ void js_loadfile(js_State *J, const char *filename)
 		js_throw(J);
 	}
 
-	js_loadstring(J, filename, s);
+	/* skip first line if it starts with "#!" */
+	p = s;
+	if (p[0] == '#' && p[1] == '!') {
+		p += 2;
+		while (*p && *p != '\n')
+			++p;
+	}
+
+	js_loadstring(J, filename, p);
 
 	js_free(J, s);
 	fclose(f);