/**
* MIT/X Consortium License
*
* Copyright © 2015 Mattias Andrée <maandree@member.fsf.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/time.h>
#define t(...) do { if (__VA_ARGS__) goto fail; } while (0)
/**
* The default word rate.
*/
#ifndef DEFAULT_RATE
# define DEFAULT_RATE 120 /* 2 hz */
#endif
/**
* Delta-value of rate increment and rate decrement.
*/
#ifndef RATE_DELTA
# define RATE_DELTA 10 /* 10/min */
#endif
/**
* The name of the process.
*/
static const char *argv0;
/**
* Have the terminal been resized?
*/
static volatile sig_atomic_t caught_sigwinch = 1;
/**
* Has the timer expired?
*/
static volatile sig_atomic_t caught_sigalrm = 0;
/**
* The width of the terminal.
*/
static size_t width = 80;
/**
* The height of the terminal.
*/
static size_t height = 30;
/**
* Signal handler for SIGWINCH.
* Invoked when the terminal resizes.
*/
static void sigwinch(int signo)
{
signal(signo, sigwinch);
caught_sigwinch = 1;
}
/**
* Signal handler for SIGALRM.
* Invoked when the timer expires.
*/
static void sigalrm(int signo)
{
signal(signo, sigalrm);
caught_sigalrm = 1;
}
/**
* Get the size of the terminal.
*/
static void get_terminal_size(void)
{
struct winsize winsize;
if (!caught_sigwinch)
return;
caught_sigwinch = 0;
while (ioctl(STDOUT_FILENO, (unsigned long)TIOCGWINSZ, &winsize) < 0)
if (errno != EINTR)
return;
height = winsize.ws_row;
width = winsize.ws_col;
}
/**
* Get the selected word rate by reading
* the environment variable RQ_RATE.
*
* @return The rate in words per minute.
*/
static long get_word_rate(void)
{
char *s;
char *e;
long r;
errno = 0;
s = getenv("RQ_RATE");
if (!s || !*s || !isdigit(*s))
return DEFAULT_RATE;
r = strtol(s, &e, 10);
if (r <= 0)
return DEFAULT_RATE;
while (*e == ' ')
e++;
if (!*e) r *= 1;
else if (!strcasecmp(e, "wpm")) r *= 1;
else if (!strcasecmp(e, "w/m")) r *= 1;
else if (!strcasecmp(e, "/m")) r *= 1;
else if (!strcasecmp(e, "wpmin")) r *= 1;
else if (!strcasecmp(e, "w/min")) r *= 1;
else if (!strcasecmp(e, "/min")) r *= 1;
else if (!strcasecmp(e, "wps")) r *= 60;
else if (!strcasecmp(e, "w/s")) r *= 60;
else if (!strcasecmp(e, "/s")) r *= 60;
else if (!strcasecmp(e, "wpsec")) r *= 60;
else if (!strcasecmp(e, "w/sec")) r *= 60;
else if (!strcasecmp(e, "/sec")) r *= 60;
else if (!strcasecmp(e, "hz")) r *= 60;
else
return DEFAULT_RATE;
return r;
}
/**
* Count the number of character in a string.
*
* Possible improvement:
* Figure out how many columns the terminal is
* likely to used to display the each character,
* and sum it.
*
* @param s The string.
* @return The number of characters in `s`.
*/
static size_t display_len(const char *s)
{
size_t r = 0;
for (; *s; s++)
r += (((int)*s & 0xC0) != 0x80);
return r;
}
/**
* Display a file word by word.
*
* @param fd File descriptor to the file.
* @param ttyfd File descriptor for reading from the terminal.
* @param rate The number of words per minute to display.
* @return 0 on success, -1 on error.
*/
static int display_file(int fd, int ttyfd, long rate)
{
#define SET_RATE \
(interval.it_value.tv_usec = 60000000L / rate, \
interval.it_value.tv_sec = interval.it_value.tv_usec / 1000000L, \
interval.it_value.tv_usec %= 1000000L)
ssize_t n;
char *buffer = NULL;
size_t ptr = 0;
size_t size = 0;
void *new;
int saved_errno;
int timer_set = 1;
char *s;
char *end;
char c;
struct itimerval interval;
memset(&interval, 0, sizeof(interval));
/* Load file. */
for (;;) {
if (ptr == size) {
size = size ? (size << 1) : (8 << 10);
new = realloc(buffer, size);
t (new == NULL);
buffer = new;
}
n = read(fd, buffer + ptr, size - ptr);
if (n < 0) {
t (errno != EINTR);
continue;
} else if (n == 0) {
break;
}
ptr += (size_t)n;
}
if (buffer == NULL)
return 0;
if (ptr == size) {
new = realloc(buffer, ++size);
t (new == NULL);
buffer = new;
}
buffer[ptr++] = '\0';
/* Present file. */
SET_RATE;
for (s = buffer; *s; s = end) {
setitimer(ITIMER_REAL, &interval, NULL);
rewait:
n = read(ttyfd, &c, sizeof(c));
if (n < 0) {
t (errno != EINTR);
c = 0;
} else if (n == 0) {
break;
}
switch (c) {
case '+': /* plus */
case '-': /* hyphen */
rate += (c == '+' ? RATE_DELTA : -RATE_DELTA);
rate = (rate <= 0 ? 1 : rate);
SET_RATE;
goto rewait;
case 'p': /* P */
if (timer_set)
memset(&interval, 0, sizeof(interval));
else
SET_RATE;
setitimer(ITIMER_REAL, &interval, NULL);
timer_set ^= 1;
goto rewait;
case 'q': /* Q */
goto done;
case 'B': /* down */
case 'C': /* right */
break;
case 'A': /* up */
case 'D': /* left */
while ((s != buffer) && strchr(" \f\n\r\t\v", *s)) s--;
while ((s != buffer) && !strchr(" \f\n\r\t\v", *s)) s--;
while ((s != buffer) && strchr(" \f\n\r\t\v", *s)) s--;
while ((s != buffer) && !strchr(" \f\n\r\t\v", *s)) s--;
if (s == buffer)
goto rewait;
break;
case 0:
if (!caught_sigalrm)
goto rewait;
caught_sigalrm = 0;
break;
default:
goto rewait;
}
get_terminal_size();
while (isspace(*s))
s++;
end = strpbrk(s, " \f\n\r\t\v");
if (end == NULL)
end = strchr(s, '\0');
c = *end, *end = '\0';
t (fprintf(stdout, "\033[H\033[2J\033[%zu;%zuH%s",
(height + 1) / 2, (width - display_len(s)) / 2 + 1, s) < 0);
t (fflush(stdout));
*end = c;
}
done:
free(buffer);
return 0;
fail:
saved_errno = errno;
free(buffer);
errno = saved_errno;
return -1;
}
int main(int argc, char *argv[])
{
int dashed = 0;
long rate = get_word_rate();
char *file = NULL;
char *arg;
int fd = -1, ttyfd = -1, tty_configured = 0;
struct termios stty;
struct termios saved_stty;
struct stat _attr;
/* Check that we have a stdout. */
if (fstat(STDOUT_FILENO, &_attr))
t (errno == EBADF);
/* Parse arguments. */
argv0 = argv ? (argc--, *argv++) : "rq";
while (argc) {
if (!dashed && !strcmp(*argv, "--")) {
dashed = 1;
argv++;
argc--;
} else if (!dashed && **argv == '-') {
arg = *argv++;
argc--;
for (arg++; *arg; arg++) {
goto usage;
}
} else {
if (file)
goto usage;
file = *argv++;
argc--;
}
}
/* Open file. */
if (!file || !strcmp(file, "-")) {
fd = STDIN_FILENO;
} else {
fd = open(file, O_RDONLY);
t (fd == -1);
}
/* Get a readable file descriptor for the controlling terminal. */
ttyfd = open("/dev/tty", O_RDONLY);
t (ttyfd == -1);
/* Configure terminal. */
t (fprintf(stdout, "\033[?1049h\033[?25l") < 0);
t (fflush(stdout));
t (tcgetattr(ttyfd, &stty));
saved_stty = stty;
stty.c_lflag &= (tcflag_t)~(ICANON | ECHO | ISIG);
t (tcsetattr(ttyfd, TCSAFLUSH, &stty));
tty_configured = 1;
/* Display file. */
signal(SIGALRM, sigalrm);
signal(SIGWINCH, sigwinch);
t (display_file(fd, ttyfd, rate));
/* Restore terminal configurations. */
tcsetattr(ttyfd, TCSAFLUSH, &saved_stty);
fprintf(stdout, "\033[?25h\033[?1049l");
fflush(stdout);
tty_configured = 0;
close(fd);
close(ttyfd);
return 0;
fail:
perror(argv0);
if (tty_configured) {
tcsetattr(ttyfd, TCSAFLUSH, &saved_stty);
fprintf(stdout, "\033[?25h\033[?1049l");
fflush(stdout);
}
if (fd >= 0)
close(fd);
if (ttyfd >= 0)
close(ttyfd);
return 1;
usage:
fprintf(stderr, "%s: Invalid arguments, see `man 1 rq'.\n", argv0);
return 2;
}
