$NetBSD: patch-ac,v 1.1 2003/10/11 11:27:56 grant Exp $

--- lib/log.c.orig	1997-06-19 02:32:05.000000000 +1000
+++ lib/log.c
@@ -77,7 +77,8 @@ static void replacePercentM(const char *
 }
 
 void S5LogvUpdate(const void *handle, int level, int msgID, const char *oformat, va_list pvar) {
-    char fmt_cpy[2*1024 + 2*10], format[2*1024 + 2*10];
+#define FMT_BUFLEN (2*1024 + 2*10)
+    char fmt_cpy[FMT_BUFLEN], format[FMT_BUFLEN];
     S5LogHandle *h = (S5LogHandle *)handle;
     int serrno = GETERRNO();
     static int dontLoop = 0;
@@ -112,7 +113,9 @@ void S5LogvUpdate(const void *handle, in
     strcat(format, " ");
     
     replacePercentM(oformat, format + strlen(format), sizeof(format) - strlen(format));
-    vsprintf(fmt_cpy, format, pvar);
+    if(vsnprintf(fmt_cpy, FMT_BUFLEN-1,format, pvar)==-1) {
+        fmt_cpy[FMT_BUFLEN-1]='\0';
+    }
 
     /* Log to the Local log facility, e.g. Stderr on Unix and maybe a window */
     /* or something on NT.  Neither system can deal with a NULL format so    */