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/*
* Copyright (C) 2024 Tristan Riehs
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <assert.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "_readline.h"
static int lower = 0;
static int upper = 100;
static FILE *logfile;
static char logbuf[64];
#define LOGBUF_OFFSET 11
/* Return a random number x such that lower <= x < upper. */
static int
calculer_rand(void)
{
return lower + rand()%(upper-lower);
}
/* Compute the number of milliseconds TP contains. */
static intptr_t
tp_ms(struct timespec const *tp)
{
return tp->tv_sec*1000 + tp->tv_nsec/1000000;
}
/* Called just before prompting the user. The returned pointer will be given
back as a parameter of measure_after. */
static void *
measure_before(void)
{
struct timespec tp;
clock_gettime(CLOCK_REALTIME, &tp);
return (void *)tp_ms(&tp);
}
/* Called just after the user prompt has been read and checked. */
int
measure_after(void *data, int correct)
{
int t0 = (intptr_t) data;
struct timespec tp;
clock_gettime(CLOCK_REALTIME, &tp);
int t1 = tp_ms(&tp);
int dt = t1 - t0;
size_t bytes_written =
LOGBUF_OFFSET + sprintf(logbuf + LOGBUF_OFFSET,
"%d\t%d\n", dt, correct);
return bytes_written != fwrite(logbuf, 1, bytes_written, logfile);
}
/* Only use in print_usage. */
#define print_opt_noarg(opt, desc) \
fprintf(stream, " -"opt"\t\t"desc"\n")
/* Only use in print_usage. */
#define print_opt_arg(opt, arg, desc) \
fprintf(stream, " -"opt" "arg"\t"desc"\n");
void
print_usage(FILE *stream)
{
fprintf(stream, "Usage: calculer [OPTIONS]\n");
fprintf(stream, "OPTIONS\n");
print_opt_noarg("V", "Print version and exit.");
print_opt_noarg("h", "Print help and exit.");
print_opt_arg("l", "LOGFILE", "Use LOGFILE as log file.\n");
print_opt_arg("m", "MIN",
"Set MIN as the minimum value numbers can take.\n");
print_opt_arg("M", "MAX",
"Set MAX as the maximum value numbers can take.\n");
}
void
print_help(void)
{
printf("calculer -- train mental calculus\n");
printf("calculer is licensed under the GPL3 License.\n");
print_usage(stdout);
}
void
print_version(void)
{
printf("%s\n", VERSION);
}
int
main(int argc, char *argv[])
{
char *logpath = "./calculer.log";
srand(time(NULL));
/* Store the prefix "YYYY-MM-DD" in LOGBUF. */
time_t now = time(NULL);
struct tm *tm = localtime(&now);
size_t bytes_written = strftime(logbuf, sizeof(logbuf), "%F\t", tm);
assert(bytes_written);
int opt;
while ((opt = getopt(argc, argv, ":Vhl:m:M:")) != -1)
{
switch (opt)
{
case 'V':
print_version();
exit(0);
case 'h':
print_help();
exit(0);
case 'l':
logpath = optarg;
break;
case 'm':
lower = atoi(optarg);
break;
case 'M':
upper = atoi(optarg);
break;
case ':':
fprintf(stderr,
"calculer: option %d requires an argument\n",
optopt);
print_usage(stderr);
exit(1);
default:
print_usage(stderr);
exit(1);
}
}
logfile = fopen(logpath, "a");
assert(logfile);
while (1)
{
char prompt[32] = {0};
int x, y, res;
char *input;
int input_val;
x = calculer_rand();
y = calculer_rand();
res = x+y;
sprintf(prompt, "%d + %d = ", x, y);
void *measure_data = measure_before();
input = readline(prompt);
if ((!input) || (*input == '\0'))
{
free(input);
fclose(logfile);
exit(0);
}
input_val = atoi(input);
if (measure_after(measure_data, input_val == res))
{
free(input);
fclose(logfile);
exit(1);
}
if (input_val == res)
printf("RIGHT\n");
else
printf("WRONG\n");
free(input);
}
fclose(logfile);
return 0;
}
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