From d3f20a0a1049feea29ae85114a1709456bdd7057 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Fabian=20Gr=C3=BCnbichler?= <f.gruenbichler@proxmox.com>
Date: Wed, 10 Jun 2020 15:22:53 +0200
Subject: [PATCH] parse_number: prevent panic on empty input
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if data is empty or the caller requested 0 digits, we can return early.

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
---
 src/main.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/main.rs b/src/main.rs
index 94a6247..613cecd 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2187,6 +2187,9 @@ fn parse_qid(data: &[u8], max: usize) -> Option<(&[u8], &[u8])> {
 /// Parse a number. Returns a tuple of (parsed_number, remaining_text) or None.
 fn parse_number(data: &[u8], max_digits: usize) -> Option<(usize, &[u8])> {
     let max = max_digits.min(data.len());
+    if max == 0 {
+        return None;
+    }
 
     match data.iter().take(max).position(|b| !b.is_ascii_digit()) {
         Some(n) if n == 0 => None,
-- 
2.39.5