add documentation to the header file

lib/dice.h

@@ -41,25 +41,86 @@ typedef enum {
     DICEOPTION_ERROR,
 } dice_option_t;
 
-void dice_result_free(dice_result_t *r);
-void dice_result_freev(dice_result_t *r, size_t len);
-
+/* Creates a new dice object that is not initialised yet.
+ * You need to call dice_parse(), dice_set() to initialise
+ * it properly.
+ */
 dice_t dice_new(void);
+
+/* Frees a previously allocated dice object. The object should
+ * no longer be used after it has been freed.
+ */
 void dice_free(dice_t t);
+
+/* Creates a new dice object, and initialises amount and sides
+ * with the given parameters. It is a convenience function to
+ * avoid calling dice_new() and then dice_set().
+ */
 dice_t dice_simple(uint32_t amount, uint32_t sides);
+
+/* Parses the given string and stores the results of the parse
+ * in the given dice object (which must be allocated by using
+ * dice_new()). The string of the dice is given by the parameter
+ * s. It must be null terminated.
+ * The function returns true if the parsing was sucessful, and
+ * false otherwise.
+ */
 bool dice_parse(dice_t d, char const *s);
 
+/* Allows to set various options to the dice object. The stdarg
+ * parameter depends on the option being set. See the enum definitions
+ * for additional details.
+ * The function returns true if it succeeds, and false if it fails.
+ */
 bool dice_set(dice_t d, dice_option_t opt, ...);
+
+/* Allows you to retrieve options from the dice object. The stdarg
+ * parameter depends on the optional being retrieved. See the enum
+ * definitions for further details.
+ * The function returns true if it succeeds, and false if it fails.
+ */
 bool dice_get(dice_t d, dice_option_t opt, ...);
 
+/* Rolls the given dice object once, and returns the result.
+ */
 int64_t dice_roll(dice_t d);
+
+/* Rolls the given dice object once, and returns the result as an
+ * array of results. Often dice_roll() is sufficient, unless you
+ * wish to know each exact result of the dice. The result should
+ * be freed by using dice_result_freev().
+ */
 bool dice_evaluate(dice_t d, dice_result_t **res, size_t *reslen);
 
+/* Frees one dice result.
+ */
+void dice_result_free(dice_result_t *r);
+
+/* Fress an array of dice results. As returned by dice_evaluate.
+ */
+void dice_result_freev(dice_result_t *r, size_t len);
+
+/* Allocates a new empty dice expression object. It should be freed
+ * by calling dice_expression_free(), and can be used on other functions
+ * such as dice_expression_parse() and dice_expression_roll().
+ */
 dice_expression_t dice_expression_new(void);
+
+/* Frees one dice expression object and all its associated data. Do
+ * not use the object after freeing it.
+ */
 void dice_expression_free(dice_expression_t e);
 
+/* Evaluate a string containing dice expression, and store it in the given
+ * dice object that was provided. If an error occours the function will return
+ * false, and will store an offset (in the string) in error, if the pointer
+ * is non-NULL.
+ */
 bool dice_expression_parse(dice_expression_t d, char const *s, int *error);
+
+/* Evaluates the previously parsed dice expression and returns the result.
+ * The function returns false if it fails, and true if it succeeds.
+ */
 bool dice_expression_roll(dice_expression_t e, int64_t *result);
-bool dice_expression_print(dice_expression_t e);
 
 #endif