diff -Nru squidGuard-1.4.orig/configure.in squidGuard-1.4/configure.in
--- squidGuard-1.4.orig/configure.in	2009-04-26 12:28:49.000000000 +0000
+++ squidGuard-1.4/configure.in	2009-04-26 12:29:35.000000000 +0000
@@ -421,7 +421,7 @@
 AC_CHECK_FUNCS(regexec, , AC_MSG_ERROR([No regexec library function.]))
 AC_CHECK_FUNCS(strdup, , AC_MSG_ERROR([No strdup library function.]))
 AC_CHECK_FUNCS(strerror, , AC_MSG_ERROR([No strerror library function.]))
-AC_CHECK_FUNCS(vsprintf, , AC_MSG_ERROR([No vsprintf library function.]))
+AC_CHECK_FUNCS(vsnprintf, , AC_MSG_ERROR([No vsnprintf library function.]))
 AC_CHECK_FUNCS(sigaction)
 AC_CHECK_FUNCS(signal)
 
diff -Nru squidGuard-1.4.orig/src/sgLog.c squidGuard-1.4/src/sgLog.c
--- squidGuard-1.4.orig/src/sgLog.c	2007-11-16 16:58:32.000000000 +0000
+++ squidGuard-1.4/src/sgLog.c	2009-04-26 12:31:40.000000000 +0000
@@ -55,7 +55,7 @@
   char msg[MAX_BUF];
   va_list ap;
   VA_START(ap, format);
-  if(vsprintf(msg, format, ap) > (MAX_BUF - 1)) 
+  if(vsnprintf(msg, MAX_BUF, format, ap) > (MAX_BUF - 1)) 
     fprintf(stderr,"overflow in vsprintf (sgLog): %s",strerror(errno));
   va_end(ap);
   date = niso(0);
@@ -87,8 +87,8 @@
   char msg[MAX_BUF];
   va_list ap;
   VA_START(ap, format);
-  if(vsprintf(msg, format, ap) > (MAX_BUF - 1)) 
-    sgLogFatalError("overflow in vsprintf (sgLogError): %s",strerror(errno));
+  if(vsnprintf(msg, MAX_BUF, format, ap) > (MAX_BUF - 1)) 
+    fprintf(stderr,"overflow in vsprintf (sgLogError): %s",strerror(errno));
   va_end(ap);
   sgLog(globalErrorLog,"%s",msg);
 }
@@ -104,7 +104,7 @@
   char msg[MAX_BUF];
   va_list ap;
   VA_START(ap, format);
-  if(vsprintf(msg, format, ap) > (MAX_BUF - 1)) 
+  if(vsnprintf(msg, MAX_BUF, format, ap) > (MAX_BUF - 1)) 
     return;
   va_end(ap);
   sgLog(globalErrorLog,"%s",msg);