[svn] Implement xdigit_to_xchar more efficiently.

src/ChangeLog

@@ -1,3 +1,15 @@
+2003-09-15  Hrvoje Niksic  <hniksic@xemacs.org>
+
+	* wget.h (XDIGIT_TO_XCHAR): Implement as index into a literal
+	string.
+	(XDIGIT_TO_xchar): Ditto.
+
+2003-09-15  Hrvoje Niksic  <hniksic@xemacs.org>
+
+	* utils.c: Change the type of timer-related functions from long to
+	double, for better precision.  On machines supporting gettimeofday
+	the timers now work with granularity of less than one millisecond.
+
 2003-09-15  Hrvoje Niksic  <hniksic@xemacs.org>
 
 	* cookies.c (parse_set_cookies): Fixed the parser to handle more

src/utils.c

@@ -1551,11 +1551,11 @@ struct wget_timer {
 
   /* The most recent elapsed time, calculated by wtimer_elapsed().
      Measured in milliseconds.  */
-  long elapsed_last;
+  double elapsed_last;
 
   /* Approximately, the time elapsed between the true start of the
      measurement and the time represented by START.  */
-  long elapsed_pre_start;
+  double elapsed_pre_start;
 };
 
 /* Allocate a timer.  It is not legal to do anything with a freshly
@@ -1624,12 +1624,12 @@ wtimer_reset (struct wget_timer *wt)
   wt->elapsed_pre_start = 0;
 }
 
-static long
+static double
 wtimer_sys_diff (wget_sys_time *wst1, wget_sys_time *wst2)
 {
 #ifdef TIMER_GETTIMEOFDAY
-  return ((wst1->tv_sec - wst2->tv_sec) * 1000
-	  + (wst1->tv_usec - wst2->tv_usec) / 1000);
+  return ((double)(wst1->tv_sec - wst2->tv_sec) * 1000
+	  + (double)(wst1->tv_usec - wst2->tv_usec) / 1000);
 #endif
 
 #ifdef TIMER_TIME
@@ -1637,7 +1637,7 @@ wtimer_sys_diff (wget_sys_time *wst1, wget_sys_time *wst2)
 #endif
 
 #ifdef WINDOWS
-  return (long)(wst1->QuadPart - wst2->QuadPart) / 10000;
+  return (double)(wst1->QuadPart - wst2->QuadPart) / 10000;
 #endif
 }
 
@@ -1645,11 +1645,11 @@ wtimer_sys_diff (wget_sys_time *wst1, wget_sys_time *wst2)
    reset.  It is allowed to call this function more than once to get
    increasingly higher elapsed values.  */
 
-long
+double
 wtimer_elapsed (struct wget_timer *wt)
 {
   wget_sys_time now;
-  long elapsed;
+  double elapsed;
 
   wtimer_sys_set (&now);
   elapsed = wt->elapsed_pre_start + wtimer_sys_diff (&now, &wt->start);
@@ -1678,18 +1678,18 @@ wtimer_elapsed (struct wget_timer *wt)
   return elapsed;
 }
 
-/* Return the assessed granularity of the timer implementation.  This
-   is important for certain code that tries to deal with "zero" time
-   intervals.  */
+/* Return the assessed granularity of the timer implementation, in
+   milliseconds.  This is important for certain code that tries to
+   deal with "zero" time intervals.  */
 
-long
+double
 wtimer_granularity (void)
 {
 #ifdef TIMER_GETTIMEOFDAY
   /* Granularity of gettimeofday is hugely architecture-dependent.
      However, it appears that on modern machines it is better than
-     1ms.  */
-  return 1;
+     1ms.  Assume 100 usecs.  */
+  return 0.1;
 #endif
 
 #ifdef TIMER_TIME
@@ -1698,7 +1698,7 @@ wtimer_granularity (void)
 #endif
 
 #ifdef TIMER_WINDOWS
-  /* ? */
+  /* #### Fill this in! */
   return 1;
 #endif
 }

src/utils.h

@@ -109,8 +109,8 @@ struct wget_timer *wtimer_allocate PARAMS ((void));
 struct wget_timer *wtimer_new PARAMS ((void));
 void wtimer_delete PARAMS ((struct wget_timer *));
 void wtimer_reset PARAMS ((struct wget_timer *));
-long wtimer_elapsed PARAMS ((struct wget_timer *));
-long wtimer_granularity PARAMS ((void));
+double wtimer_elapsed PARAMS ((struct wget_timer *));
+double wtimer_granularity PARAMS ((void));
 
 char *html_quote_string PARAMS ((const char *));
 

src/wget.h

@@ -157,23 +157,42 @@ char *xstrdup_debug PARAMS ((const char *, const char *, int));
 /* The smaller value of the two.  */
 #define MINVAL(x, y) ((x) < (y) ? (x) : (y))
 
-/* Convert the ASCII character X to a hex-digit.  X should be between
-   '0' and '9', or between 'A' and 'F', or between 'a' and 'f'.  The
-   result is a number between 0 and 15.  If X is not a hexadecimal
-   digit character, the result is undefined.  */
-#define XCHAR_TO_XDIGIT(x)			\
-  (((x) >= '0' && (x) <= '9') ?			\
-   ((x) - '0') : (TOUPPER(x) - 'A' + 10))
+/* Convert the ASCII character that represents a hexadecimal digit to
+   the number in range [0, 16) that corresponds to the digit.  X
+   should be between '0' and '9', or between 'A' and 'F', or between
+   'a' and 'f'.  If X is not a hexadecimal digit character, the result
+   is undefined.  */
+#define XCHAR_TO_XDIGIT(x)						\
+  (((x) >= '0' && (x) <= '9') ? ((x) - '0') : (TOUPPER(x) - 'A' + 10))
 
-/* The reverse of the above: convert a HEX digit in the [0, 15] range
-   to an ASCII character representing it.  The A-F characters are
-   always in upper case.  */
-#define XDIGIT_TO_XCHAR(x) (((x) < 10) ? ((x) + '0') : ((x) - 10 + 'A'))
+/* The reverse of the above: convert a digit number in the [0, 16)
+   range to an ASCII character.  The A-F characters are in upper
+   case.  */
+#define XDIGIT_TO_XCHAR(x) ("0123456789ABCDEF"[x])
 
-/* Like XDIGIT_TO_XCHAR, but produce a lower-case char. */
-#define XDIGIT_TO_xchar(x) (((x) < 10) ? ((x) + '0') : ((x) - 10 + 'a'))
+/* Like XDIGIT_TO_XCHAR, but generates lower-case characters. */
+#define XDIGIT_TO_xchar(x) ("0123456789abcdef"[x])
 
-#define ARRAY_SIZE(array) (sizeof (array) / sizeof (*(array)))
+/* Returns the number of elements in an array with fixed
+   initialization.  For example:
+
+   static char a[] = "foo";     -- countof(a) == 4 (for terminating \0)
+
+   int a[5] = {1, 2};           -- countof(a) == 5
+
+   char *a[3] = {               -- countof(a) == 3
+     "foo", "bar", "baz"
+   };
+
+   And, most importantly, it works when the compiler counts the array
+   elements for you:
+
+   char *a[] = {                -- countof(a) == 4
+     "foo", "bar", "baz", "qux"
+   }  */
+#define countof(array) (sizeof (array) / sizeof (*(array)))
+
+#define ARRAY_SIZE(array) countof (array)
 
 /* Copy the data delimited with BEG and END to alloca-allocated
    storage, and zero-terminate it.  BEG and END are evaluated only