commit 801e13dfab0e60304cf2cd5935da0ea1e2e4811f
from: Kirill A. Korinsky <kirill@korins.ky>
date: Fri Jan 31 23:33:54 2025 UTC

prevent dkim_ar_cat from lose last character

It losed the last character when the length resulted string was multiple
of 256

commit - 09d27b584459ff5b29ddecd8754f114edd870b69
commit + 801e13dfab0e60304cf2cd5935da0ea1e2e4811f
blob - 9c85ba5bd52795c50f96e7302abd4d33ccbf5d5c
blob + 24fa6b361beeed3ee51ed7efb55514422a3d965c
--- main.c
+++ main.c
@@ -1740,7 +1740,7 @@ dkim_ar_cat(char **ar, size_t *n, size_t aroff, const 
 	va_end(ap);
 	if (size <= 0)
 		return -1;
-	if (size + aroff <= *n)
+	if (size + aroff < *n)
 		return (ssize_t)size + aroff;
 	nn = (((aroff + size)  / 256) + 1) * 256;
 	artmp = realloc(*ar, nn);