From 0b3f4c57653153ff420f981e54a606fe7a5fea5b Mon Sep 17 00:00:00 2001
From: Tobie Morgan Hitchcock <tobie@abcum.com>
Date: Mon, 21 Mar 2022 13:48:59 +0000
Subject: [PATCH] Prevent usize overflow when no records found

---
 lib/src/dbs/channel.rs |  8 ++++++--
 lib/src/dbs/iterate.rs |  8 ++++++--
 lib/src/kvs/tx.rs      | 32 ++++++++++++++++++++++++--------
 3 files changed, 36 insertions(+), 12 deletions(-)

diff --git a/lib/src/dbs/channel.rs b/lib/src/dbs/channel.rs
index 4a14cac3..e9a3034e 100644
--- a/lib/src/dbs/channel.rs
+++ b/lib/src/dbs/channel.rs
@@ -147,12 +147,16 @@ impl Table {
 					};
 					if !res.is_empty() {
 						// Get total results
-						let n = res.len() - 1;
+						let n = res.len();
+						// Exit when settled
+						if n == 0 {
+							break;
+						}
 						// Loop over results
 						for (i, (k, v)) in res.into_iter().enumerate() {
 							if ctx.is_ok() {
 								// Ready the next
-								if i == n {
+								if n == i + 1 {
 									nxt = Some(k.clone());
 								}
 								// Parse the key-value
diff --git a/lib/src/dbs/iterate.rs b/lib/src/dbs/iterate.rs
index a4afa641..cfb92a69 100644
--- a/lib/src/dbs/iterate.rs
+++ b/lib/src/dbs/iterate.rs
@@ -144,12 +144,16 @@ impl Table {
 					};
 					if !res.is_empty() {
 						// Get total results
-						let n = res.len() - 1;
+						let n = res.len();
+						// Exit when settled
+						if n == 0 {
+							break;
+						}
 						// Loop over results
 						for (i, (k, v)) in res.into_iter().enumerate() {
 							if ctx.is_ok() {
 								// Ready the next
-								if i == n {
+								if n == i + 1 {
 									nxt = Some(k.clone());
 								}
 								// Parse the key-value
diff --git a/lib/src/kvs/tx.rs b/lib/src/kvs/tx.rs
index 0569c620..2455bb9a 100644
--- a/lib/src/kvs/tx.rs
+++ b/lib/src/kvs/tx.rs
@@ -191,11 +191,15 @@ impl Transaction {
 				}
 			};
 			// Get total results
-			let n = res.len() - 1;
+			let n = res.len();
+			// Exit when settled
+			if n == 0 {
+				break;
+			}
 			// Loop over results
 			for (i, (k, v)) in res.into_iter().enumerate() {
 				// Ready the next
-				if i == n {
+				if n == i + 1 {
 					nxt = Some(k.clone());
 				}
 				// Delete
@@ -234,11 +238,15 @@ impl Transaction {
 				}
 			};
 			// Get total results
-			let n = res.len() - 1;
+			let n = res.len();
+			// Exit when settled
+			if n == 0 {
+				break;
+			}
 			// Loop over results
 			for (i, (k, _)) in res.into_iter().enumerate() {
 				// Ready the next
-				if i == n {
+				if n == i + 1 {
 					nxt = Some(k.clone());
 				}
 				// Delete
@@ -278,11 +286,15 @@ impl Transaction {
 				}
 			};
 			// Get total results
-			let n = res.len() - 1;
+			let n = res.len();
+			// Exit when settled
+			if n == 0 {
+				break;
+			}
 			// Loop over results
 			for (i, (k, v)) in res.into_iter().enumerate() {
 				// Ready the next
-				if i == n {
+				if n == i + 1 {
 					nxt = Some(k.clone());
 				}
 				// Delete
@@ -321,11 +333,15 @@ impl Transaction {
 				}
 			};
 			// Get total results
-			let n = res.len() - 1;
+			let n = res.len();
+			// Exit when settled
+			if n == 0 {
+				break;
+			}
 			// Loop over results
 			for (i, (k, _)) in res.into_iter().enumerate() {
 				// Ready the next
-				if i == n {
+				if n == i + 1 {
 					nxt = Some(k.clone());
 				}
 				// Delete