107 lines
1.9 KiB
C
107 lines
1.9 KiB
C
/*
|
|
* No copyright is claimed. This code is in the public domain; do with
|
|
* it what you wish.
|
|
*
|
|
* Written by Karel Zak <kzak@redhat.com>
|
|
*/
|
|
#include <ctype.h>
|
|
#include <unistd.h>
|
|
|
|
#include "c.h"
|
|
#include "ttyutils.h"
|
|
|
|
int get_terminal_width(int default_width)
|
|
{
|
|
int width = 0;
|
|
|
|
#if defined(TIOCGWINSZ)
|
|
struct winsize w_win;
|
|
if (ioctl (STDOUT_FILENO, TIOCGWINSZ, &w_win) == 0)
|
|
width = w_win.ws_col;
|
|
#elif defined(TIOCGSIZE)
|
|
struct ttysize t_win;
|
|
if (ioctl (STDOUT_FILENO, TIOCGSIZE, &t_win) == 0)
|
|
width = t_win.ts_cols;
|
|
#endif
|
|
|
|
if (width <= 0) {
|
|
const char *cp = getenv("COLUMNS");
|
|
|
|
if (cp) {
|
|
char *end = NULL;
|
|
long c;
|
|
|
|
errno = 0;
|
|
c = strtol(cp, &end, 10);
|
|
|
|
if (errno == 0 && end && *end == '\0' && end > cp &&
|
|
c > 0 && c <= INT_MAX)
|
|
width = c;
|
|
}
|
|
}
|
|
|
|
return width > 0 ? width : default_width;
|
|
}
|
|
|
|
int get_terminal_name(const char **path,
|
|
const char **name,
|
|
const char **number)
|
|
{
|
|
const char *tty;
|
|
const char *p;
|
|
int fd;
|
|
|
|
|
|
if (name)
|
|
*name = NULL;
|
|
if (path)
|
|
*path = NULL;
|
|
if (number)
|
|
*number = NULL;
|
|
|
|
if (isatty(STDIN_FILENO))
|
|
fd = STDIN_FILENO;
|
|
else if (isatty(STDOUT_FILENO))
|
|
fd = STDOUT_FILENO;
|
|
else if (isatty(STDERR_FILENO))
|
|
fd = STDERR_FILENO;
|
|
else
|
|
return -1;
|
|
|
|
tty = ttyname(fd);
|
|
if (!tty)
|
|
return -1;
|
|
if (path)
|
|
*path = tty;
|
|
tty = strncmp(tty, "/dev/", 5) == 0 ? tty + 5 : tty;
|
|
if (name)
|
|
*name = tty;
|
|
if (number) {
|
|
for (p = tty; p && *p; p++) {
|
|
if (isdigit(*p)) {
|
|
*number = p;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
#ifdef TEST_PROGRAM
|
|
# include <stdlib.h>
|
|
int main(void)
|
|
{
|
|
const char *path, *name, *num;
|
|
|
|
if (get_terminal_name(&path, &name, &num) == 0) {
|
|
fprintf(stderr, "tty path: %s\n", path);
|
|
fprintf(stderr, "tty name: %s\n", name);
|
|
fprintf(stderr, "tty number: %s\n", num);
|
|
}
|
|
fprintf(stderr, "tty width: %d\n", get_terminal_width(0));
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
#endif
|