From c5809a4296f852fe30a7356854d3d0758fa1bf7f Mon Sep 17 00:00:00 2001
From: lemon
Date: Tue, 8 Feb 2022 12:37:45 +0100
Subject: Fix fmt() off-by-one error

vsnprintf returns the byte count of the formatted output not including
the null terminator, so in the case that len == 1024 the last character
of the output was being truncated and not detected by the later check.
Changing the greater than comparison to greater than or equal fixes this
edge case.
---
 html.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/html.c b/html.c
index cefcf5e..ced781a 100644
--- a/html.c
+++ b/html.c
@@ -59,7 +59,7 @@ char *fmt(const char *format, ...)
 	va_start(args, format);
 	len = vsnprintf(buf[bufidx], sizeof(buf[bufidx]), format, args);
 	va_end(args);
-	if (len > sizeof(buf[bufidx])) {
+	if (len >= sizeof(buf[bufidx])) {
 		fprintf(stderr, "[html.c] string truncated: %s\n", format);
 		exit(1);
 	}
-- 
cgit 1.4.1-21-gabe81