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#define _POSIX_C_SOURCE 200809L
#define _XOPEN_SOURCE
#include <fcntl.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <termios.h>
#include <unistd.h>
#include <wchar.h>
#define ERR(str) { perror(str); err = EXIT_FAILURE; goto end; }
int main()
{
if (setlocale(LC_ALL, "") == NULL) {
perror("setlocale");
exit(EXIT_FAILURE);
}
char *buf = NULL;
size_t siz = 0;
ssize_t len;
int err = EXIT_SUCCESS;
int tty_fd = open("/dev/tty", O_RDWR);
if (tty_fd < 0) {
perror("open");
return EXIT_FAILURE;
}
while ((len = getline(&buf, &siz, stdin)) > 0) {
struct winsize ws;
if (ioctl(tty_fd, TIOCGWINSZ, &ws) < 0) ERR("ioctl")
int term_width = ws.ws_col;
char *ptr = buf;
char *last = ptr;
int str_width = 0;
mbstate_t mbs = {0};
while (len > 0) {
wchar_t wc;
size_t adv = mbrtowc(&wc, ptr, len, &mbs);
if (adv == (size_t) -1 || adv == (size_t) -2) ERR("mbrtowc")
int width = wcwidth(wc);
if (width > 0)
str_width += width;
if (*ptr == '\n' || str_width >= term_width - 12) {
for (int i = (term_width - str_width) / 2; i > 0; i--)
putchar(' ');
fwrite(last, 1, ptr - last + 1, stdout);
if (*ptr != '\n')
putchar('\n');
last = ptr + adv;
str_width = 0;
}
ptr += adv;
len -= adv;
}
}
end:
close(tty_fd);
if (buf)
free(buf);
return err;
}
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