Standardize the way we generate random numbers.

libc/inc/stdlib.h

@@ -70,8 +70,30 @@ char *getenv(const char *name);
 
 /// @brief Allows to set the seed of the random value generator.
 /// @param x The new seed.
-void srand(int x);
+void srand(unsigned x);
 
-/// @brief Generates a random value.
-/// @return The random value.
-int rand();
+/// @brief Generates a random unsigned integer between 0 and RAND_MAX.
+/// @return the random value.
+unsigned rand();
+
+/// @brief Generates a random floating point number between 0 and 1.
+/// @return the random value.
+float randf();
+
+/// @brief Generates a random integer between lb and ub.
+/// @param lb the lower-bound value.
+/// @param ub the upper-bound value.
+/// @return the random value.
+int randint(int lb, int ub);
+
+/// @brief Generates a random unsigned between lb and ub.
+/// @param lb the lower-bound value.
+/// @param ub the upper-bound value.
+/// @return the random value.
+unsigned randuint(unsigned lb, unsigned ub);
+
+/// @brief Generates a random float between lb and ub.
+/// @param lb the lower-bound value.
+/// @param ub the upper-bound value.
+/// @return the random value.
+float randfloat(float lb, float ub);

libc/src/stdlib.c

@@ -83,14 +83,34 @@ void free(void *ptr)
 }
 
 /// Seed used to generate random numbers.
-static int rseed = 0;
+static unsigned rseed = 0;
 
-void srand(int x)
+void srand(unsigned x)
 {
     rseed = x;
 }
 
-int rand()
+unsigned rand()
 {
     return rseed = (rseed * 1103515245U + 12345U) & RAND_MAX;
 }
+
+float randf()
+{
+    return ((float)rand() / (float)(RAND_MAX));
+}
+
+int randint(int lb, int ub)
+{
+    return lb + ((int)rand() % (ub - lb + 1));
+}
+
+unsigned randuint(unsigned lb, unsigned ub)
+{
+    return lb + (rand() % (ub - lb + 1));
+}
+
+float randfloat(float lb, float ub)
+{
+    return lb + (randf() * (ub - lb));
+}