changed using improved pseudo-random number generator for UUID generation

[rocksndiamonds.git] / src / libgame / misc.c

diff --git a/src/libgame/misc.c b/src/libgame/misc.c
index 8bc457216de7448418ad5cebd885728e562b5b60..2692e69c6b3274b6ad957187b9d30ac95fdd69b9 100644 (file)
--- a/src/libgame/misc.c
+++ b/src/libgame/misc.c
@@ -557,7 +557,12 @@ boolean getTokenValueFromString(char *string, char **token, char **value)
 #define UUID_CHARS             (UUID_BYTES * 2)
 #define UUID_LENGTH            (UUID_CHARS + 4)
 
-char *getUUID(void)
+static unsigned int uuid_random_function(int max)
+{
+  return GetBetterRandom(max);
+}
+
+char *getUUIDExt(unsigned int (*random_function)(int max))
 {
   static char uuid[UUID_LENGTH + 1];
   int data[UUID_BYTES];
@@ -565,7 +570,7 @@ char *getUUID(void)
   int i;
 
   for (i = 0; i < UUID_BYTES; i++)
-    data[i] = GetSimpleRandom(256);
+    data[i] = random_function(256);
 
   data[6] = 0x40 | (data[6] & 0x0f);
   data[8] = 0x80 | (data[8] & 0x3f);
@@ -582,6 +587,11 @@ char *getUUID(void)
   return uuid;
 }
 
+char *getUUID(void)
+{
+  return getUUIDExt(uuid_random_function);
+}
+
 
 // ----------------------------------------------------------------------------
 // counter functions
@@ -746,7 +756,7 @@ void SkipUntilDelayReached(unsigned int *counter_var, unsigned int delay,
 // random generator functions
 // ----------------------------------------------------------------------------
 
-unsigned int init_random_number(int nr, int seed)
+static unsigned int init_random_number_ext(int nr, int seed)
 {
   if (seed == NEW_RANDOMIZE)
   {
@@ -774,9 +784,32 @@ unsigned int init_random_number(int nr, int seed)
   return (unsigned int) seed;
 }
 
+static unsigned int prng_seed_gettimeofday(void)
+{
+  struct timeval current_time;
+
+  gettimeofday(&current_time, NULL);
+
+  prng_seed_bytes(&current_time, sizeof(current_time));
+
+  return 0;
+}
+
+unsigned int init_random_number(int nr, int seed)
+{
+  return (nr == RANDOM_BETTER ? prng_seed_gettimeofday() :
+         init_random_number_ext(nr, seed));
+}
+
+static unsigned int get_random_number_ext(int nr)
+{
+  return (nr == RANDOM_BETTER ? prng_get_uint() :
+         random_linux_libc(nr));
+}
+
 unsigned int get_random_number(int nr, int max)
 {
-  return (max > 0 ? random_linux_libc(nr) % max : 0);
+  return (max > 0 ? get_random_number_ext(nr) % max : 0);
 }
 
 
@@ -2786,6 +2819,22 @@ int copyFile(char *filename_from, char *filename_to)
   return 0;
 }
 
+boolean touchFile(char *filename)
+{
+  FILE *file;
+
+  if (!(file = fopen(filename, MODE_WRITE)))
+  {
+    Warn("cannot touch file '%s'", filename);
+
+    return FALSE;
+  }
+
+  fclose(file);
+
+  return TRUE;
+}
+
 
 // ----------------------------------------------------------------------------
 // functions for directory handling