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#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#define NB_EOF -1
#define NB_AGAIN -2
static char buffer[ BUFSIZ ];
static size_t buf_pos = 0;
static size_t buf_fill = 0;
#define fold inline __attribute__((always_inline)) static
fold void set_stdin_nonblocking(void) {
static int done = 0;
if (!done) {
int flags = fcntl(STDIN_FILENO, F_GETFL);
if (flags != -1) { fcntl(STDIN_FILENO, F_SETFL, flags | O_NONBLOCK); }
done = 1;
}
}
fold int nb_getchar(void) {
set_stdin_nonblocking();
if (buf_pos < buf_fill) { return (unsigned char) buffer[ buf_pos++ ]; }
ssize_t n;
do { n = read(STDIN_FILENO, buffer, sizeof(buffer)); } while (n == -1 && errno == EINTR);
if (n == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK) { return NB_AGAIN; }
return NB_EOF;
}
if (n == 0) { return NB_EOF; }
buf_pos = 0;
buf_fill = n;
return (unsigned char) buffer[ buf_pos++ ];
}
fold uint64_t time_ms(void) {
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
return (uint64_t) ts.tv_sec * 1000 + (uint64_t) ts.tv_nsec / 1000000;
}
#define clear() printf("\033[2J\033[H")
static struct termios original_tio;
static int tio_saved = 0;
void enter_state(void) {
if (!isatty(STDIN_FILENO)) return;
if (!tio_saved) {
if (tcgetattr(STDIN_FILENO, &original_tio) == -1) {
perror("tcgetattr");
exit(1);
}
tio_saved = 1;
}
struct termios raw = original_tio;
raw.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
raw.c_oflag &= ~OPOST;
raw.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
raw.c_cflag &= ~(CSIZE | PARENB);
raw.c_cflag |= CS8;
raw.c_cc[ VMIN ] = 1;
raw.c_cc[ VTIME ] = 0;
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) {
perror("tcsetattr (raw)");
exit(1);
}
}
void exit_state(void) {
if (tio_saved && isatty(STDIN_FILENO)) {
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &original_tio) == -1) {
perror("tcsetattr (restore)");
exit(1);
}
}
}
void bye() {
printf("\r\n\ngoodbye.\r\n");
exit(0);
}
fold void print_dur(uint64_t duration) {
uint64_t hours = 0, minutes = 0, seconds = 0, ms = 0;
ms = duration % 1000;
duration /= 1000;
seconds = duration % 60;
duration /= 60;
minutes = duration % 60;
duration /= 60;
hours = duration;
printf("%2" PRIu64 "h ", hours);
printf("%2" PRIu64 "m ", minutes);
printf("%2" PRIu64 "s ", seconds);
printf("%4" PRIu64 "ms", ms);
fflush(stdout);
}
fold void yield(void) {
struct timespec ts = { .tv_sec = 0, .tv_nsec = 999000 };
nanosleep(&ts, NULL);
}
#define unlikely(a) __builtin_expect(!!(a), 0)
int main() {
enter_state();
atexit(exit_state);
printf(
"\r\nstopwatch\r\n\n"
"instructions:\r\n"
" space => pause/resume\r\n"
" ctrl+c / ctrl+d / eof => exit\r\n"
" press space to start.\r\n"
"\r\n");
int c;
while ((c = nb_getchar()) != ' ') {
if (unlikely(c == 3 || c == 4 || c == NB_EOF)) bye();
yield();
}
uint64_t tally = 0;
uint64_t start;
while (1) {
uint64_t cur;
start = time_ms();
char parity = 1;
while ((c = nb_getchar()) != ' ') {
// clear();
cur = time_ms();
if (parity) {
printf("\r");
printf("[ ] ");
print_dur(cur - start + tally);
}
parity = !parity;
if (unlikely(c == 3 || c == 4 || c == NB_EOF)) bye();
yield();
}
tally += time_ms() - start;
printf("\r");
printf("[x] ");
print_dur(tally);
while ((c = nb_getchar()) != ' ') {
if (unlikely(c == 3 || c == 4 || c == NB_EOF)) bye();
yield();
}
}
bye();
}
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