added %F to lognames, to support ISO date format

docs/man-xlate/nmap-de.1

@@ -1625,7 +1625,10 @@ entspricht
 %H%M%S,
 %R
 entspricht
-%H%M
+%H%M.
+%F
+entspricht
+%Y-%m-%d
 und
 %D
 entspricht

docs/man-xlate/nmap-man-de.xml

@@ -3384,7 +3384,8 @@ Umwandlungen im Dateinamen. <literal>%H</literal>, <literal>%M</literal>,
 <literal>%y</literal> und <literal>%Y</literal> sind alle exakt gleich 
 wie in <function>strftime</function>. <literal>%T</literal> entspricht 
 <literal>%H%M%S</literal>, <literal>%R</literal> entspricht 
-<literal>%H%M</literal> und <literal>%D</literal> entspricht 
+<literal>%H%M</literal>, <literal>%F</literal> entspricht 
+<literal>%Y-%m-%d</literal> und <literal>%D</literal> entspricht 
 <literal>%m%d%y</literal>. Ein <literal>%</literal>, dem ein anderes Zeichen 
 folgt, ergibt nur genau dieses Zeichen (<literal>%%</literal> ergibt ein 
 Prozentzeichen). Also erzeugt <option>-oX 'scan-%T-%D.xml'</option> eine 

docs/nmap.1

@@ -1978,7 +1978,10 @@ is the same as
 %H%M%S,
 %R
 is the same as
-%H%M, and
+%H%M,
+%F
+is the same as
+%Y-%m-%d, and
 %D
 is the same as
 %m%d%y\&. A

docs/refguide.xml

@@ -3709,7 +3709,8 @@ conversions in the filename.  <literal>%H</literal>, <literal>%M</literal>,
 <literal>%y</literal>, and <literal>%Y</literal> are all exactly the same
 as in <function>strftime</function>.  <literal>%T</literal> is the same
 as <literal>%H%M%S</literal>, <literal>%R</literal> is the same as
-<literal>%H%M</literal>, and <literal>%D</literal> is the same as
+<literal>%H%M</literal>, <literal>%F</literal> is the same as
+<literal>%Y%m%d</literal>, and <literal>%D</literal> is the same as
 <literal>%m%d%y</literal>.  A <literal>%</literal> followed by any other
 character just yields that character (<literal>%%</literal> gives you a
 percent symbol).  So <option>-oX 'scan-%T-%D.xml'</option> will use an XML

output.cc

@@ -935,8 +935,8 @@ void printportoutput(Target *currenths, PortList *plist) {
 
 char *logfilename(const char *str, struct tm *tm) {
   char *ret, *end, *p;
-  char tbuf[10];
-  int retlen = strlen(str) * 6 + 1;
+  char tbuf[11];
+  int retlen = strlen(str) * 8 + 1;
 
   ret = (char *) safe_malloc(retlen);
   end = ret + retlen;
@@ -979,6 +979,9 @@ char *logfilename(const char *str, struct tm *tm) {
       case 'D':
         strftime(tbuf, sizeof tbuf, "%m%d%y", tm);
         break;
+      case 'F':
+        strftime(tbuf, sizeof tbuf, "%Y-%m-%d", tm);
+        break;
       default:
         *p++ = *str;
         continue;