Initial commit

.gitignore

@@ -0,0 +1 @@
+/target

Makefile

@@ -0,0 +1,5 @@
+CC_FLAGS := -O2 -Wall -std=c99
+PLATFORM := linux # supports windows, macos
+
+default:
+	$(CC) $(CC_FLAGS) -DPLATFORM=$(PLATFORM) -o roll roll.c

README.md

@@ -0,0 +1,25 @@
+# `roll`
+
+Basic di(c)e roller utility.
+
+## Usage
+
+Supports basic roll functionality for standard any set of dice and their sides.
+You *must* always include both a number of dice and the sides of the dice.
+
+```bash
+$ roll 5d2
+6
+```
+
+By default, the sum of the rolls will be printed out on the terminal.
+
+## Options
+
+THE OPTIONS DO NOT WORK AT THIS TIME.
+
+* `-a` -- `--all`
+	* Show a list of all roles instead of the sum (overrides default behaviour).
+* `-s` -- `--sum`
+	* Show the sum of all roles. This may be combined with other options.
+

roll.c

@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+enum Flags {
+	LIST_ALL = 0x1,
+	SHOW_SUM = 0x2,
+};
+
+unsigned int roll_one(unsigned int sides) {
+	return (rand() % sides) + 1;
+}
+
+void roll(unsigned int sides, unsigned int num_rolls, unsigned int* buffer) {
+	for (unsigned int i = 0; i < num_rolls; i++) {
+		buffer[i] = roll_one(sides);
+	}
+}
+
+int read_roll(const char* arg, unsigned int* sides, unsigned int* num_rolls) {
+	return sscanf(arg, "%ud%u", num_rolls, sides);
+}
+
+int main(int argc, char** argv) {
+	if (argc != 2) {
+		printf("You must provide exactly one argument.\n");
+		exit(1);
+	}
+	unsigned int sides, num_rolls;
+	time_t t;
+	if (!read_roll(argv[1], &sides, &num_rolls)) {
+		printf("Invalid arguments! Must be of format <N>d<M>, where N is the number of dice to roll and <M> is the sides on the die.\n");
+		exit(2);
+	}
+	enum Flags flags = 0x0;
+	for (int argi = 0; argi < argc; argi++) {
+		if (strcmp(argv[argi], "-s") ||
+				strcmp(argv[argi], "--sum")) {
+			flags |= SHOW_SUM;
+		} else if (strcmp(argv[argi], "-a") ||
+				strcmp(argv[argi], "--all")) {
+			flags |= LIST_ALL;
+		}
+	}
+	// default if no arguments supplied: show only the sum
+	if (flags == 0x0) {
+		flags |= SHOW_SUM;
+	}
+	unsigned int rolls[256] = {0};
+	// seed random number generator
+	srand((unsigned) time(&t));
+
+	roll(sides, num_rolls, rolls);
+	unsigned int sum = 0;
+	for (unsigned int i = 0; i < num_rolls; i++) {
+		sum += rolls[i];
+		if ((flags & LIST_ALL) == LIST_ALL) {
+			printf("%u", rolls[i]);
+			if (i == num_rolls-1) {
+				printf("\n");
+			}
+		}
+	}
+	if ((flags & SHOW_SUM) == SHOW_SUM) {
+		printf("%u\n", sum);
+	}
+}