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/* See LICENSE file for copyright and license details. */
#include "common.h"
/* TODO add support for up and down arrows to browse previous entries in the same session */
USAGE("");
struct die {
intmax_t count;
intmax_t min;
intmax_t max;
};
static intmax_t
random_int(intmax_t min, intmax_t max)
{
uintmax_t res, max0 = (uintmax_t)max - (uintmax_t)min, max1;
int steps;
ssize_t r;
size_t n;
for (max1 = max0, steps = 0; max1 < UINTMAX_MAX && (max1 & (max1 + 1)); steps++)
max1 |= max1 >> steps;
do {
for (n = 0; n < sizeof(res); n += (size_t)r) {
r = getrandom(&((char *)&res)[n], sizeof(res) - n, 0);
if (r < 0)
eprintf("getrandom <buffer> %zu 0:", sizeof(res) - n);
}
res &= max1;
} while (res > max0);
return (intmax_t)res + min;
}
static void
roll_dice(const struct die *dice, size_t n)
{
intmax_t sum = 0, res, j;
size_t i;
for (i = 0; i < n; i++) {
for (j = 0; j < dice[i].count; j++) {
sum += res = random_int(dice[i].min, dice[i].max);
printf("Die roll: %ji\n", res);
}
}
if (n > 1 || (n == 1 && dice[0].count > 1)) {
printf("Sum: %ji\n", sum);
}
}
static int
parse_dice(const char *s, struct die **dicep, size_t *ndicep)
{
struct die *dice = NULL, *die;
size_t ndice = 0;
intmax_t min_sum = 0, max_sum = 0, num, i;
ndice = 0;
for (;;) {
while (*s == ' ' || *s == '\t')
s++;
if (!*s)
break;
if (!isdigit(*s) && *s != '-' && *s != 'd' && *s != 'D')
goto invalid;
dice = ereallocn(dice, ++ndice, sizeof(*dice), 0);
die = &dice[ndice - 1];
die->count = 1;
die->min = 1;
num = 1;
if (*s == 'd' || *s == 'D')
goto at_d;
errno = 0;
num = strtoimax(s, (void *)&s, 0);
if (errno)
goto invalid;
if (*s == 'd' || *s == 'D') {
at_d:
s++;
if (num < 1)
goto invalid;
die->count = (size_t)num;
if (!isdigit(*s) && *s != '-')
goto invalid;
errno = 0;
num = strtoimax(s, (void *)&s, 0);
if (errno)
goto invalid;
}
die->max = num;
if (*s == '-') {
s++;
die->min = num;
errno = 0;
die->max = strtoimax(s, (void *)&s, 0);
if (errno)
goto invalid;
}
if (die->min > die->max)
goto invalid;
for (i = 0; i < die->count; i++) {
if (die->min < 0 && min_sum < INTMAX_MIN - die->min) {
printf("\033[31m%s\033[m\n", "Negative overflow in sum of minimums");
return -1;
}
if (die->min > 0 && min_sum > INTMAX_MAX - die->min) {
printf("\033[31m%s\033[m\n", "Positive overflow in sum of minimums");
return -1;
}
if (die->max < 0 && max_sum < INTMAX_MIN - die->max) {
printf("\033[31m%s\033[m\n", "Negative overflow in sum of maximums");
return -1;
}
if (die->max > 0 && max_sum > INTMAX_MAX - die->max) {
printf("\033[31m%s\033[m\n", "Positive overflow in sum of maximums");
return -1;
}
min_sum += die->min;
max_sum += die->max;
}
if (*s && *s != ',' && *s != ' ' && *s != '\t')
goto invalid;
if (*s == ',')
s++;
}
if (*s || !ndice)
goto invalid;
free(*dicep);
*dicep = dice;
*ndicep = ndice;
return 0;
invalid:
printf("\033[31m%s\033[m\n", "Invalid input");
return -1;
}
int
main(int argc, char *argv[])
{
struct die *dice = NULL;
size_t ndice = 0;
char *line = NULL;
size_t size = 0;
ssize_t len;
int first;
NOFLAGS(argc);
for (first = 1;; first = 0) {
again:
if (first)
printf("\033[1m%s: \033[m", "Enter dice to roll");
else
printf("\033[1m%s\033[m (%s): ", "Enter dice to roll", "Leave empty to reroll");
fflush(stdout);
len = getdelim(&line, &size, '\n', stdin);
if (len < 0) {
printf("\n");
break;
}
if (len && line[len - 1] == '\n')
line[--len] = '\0';
if (!strcasecmp(line, "q") || !strcasecmp(line, "exit") || !strcasecmp(line, "quit"))
break;
if (!*line ? first : parse_dice(line, &dice, &ndice))
goto again;
roll_dice(dice, ndice);
}
if (ferror(stdin))
eprintf("getdelim <stdin>:");
free(dice);
free(line);
return 0;
}
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