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/*
* 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"
static int get_env_int(const char *name)
{
const char *cp = getenv(name);
if (cp) {
char *end = NULL;
long x;
errno = 0;
x = strtol(cp, &end, 10);
if (errno == 0 && end && *end == '\0' && end > cp &&
x > 0 && x <= INT_MAX)
return x;
}
return -1;
}
int get_terminal_dimension(int *cols, int *lines)
{
int c = 0, l = 0;
#if defined(TIOCGWINSZ)
struct winsize w_win;
if (ioctl (STDOUT_FILENO, TIOCGWINSZ, &w_win) == 0) {
c = w_win.ws_col;
l = w_win.ws_row;
}
#elif defined(TIOCGSIZE)
struct ttysize t_win;
if (ioctl (STDOUT_FILENO, TIOCGSIZE, &t_win) == 0) {
c = t_win.ts_cols;
l = t_win.ts_lines;
}
#endif
if (cols && c <= 0)
c = get_env_int("COLUMNS");
if (lines && l <= 0)
l = get_env_int("LINES");
if (cols)
*cols = c;
if (lines)
*lines = l;
return 0;
}
int get_terminal_width(int default_width)
{
int width = 0;
get_terminal_dimension(&width, NULL);
return width > 0 ? width : default_width;
}
int get_terminal_stdfd(void)
{
if (isatty(STDIN_FILENO))
return STDIN_FILENO;
else if (isatty(STDOUT_FILENO))
return STDOUT_FILENO;
else if (isatty(STDERR_FILENO))
return STDERR_FILENO;
return -EINVAL;
}
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;
fd = get_terminal_stdfd();
if (fd < 0)
return fd; /* error */
tty = ttyname(fd);
if (!tty)
return -1;
if (path)
*path = tty;
if (name || number)
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;
}
int get_terminal_type(const char **type)
{
*type = getenv("TERM");
if (*type)
return -EINVAL;
return 0;
}
#ifdef TEST_PROGRAM_TTYUTILS
# include <stdlib.h>
int main(void)
{
const char *path, *name, *num;
int c, l;
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);
}
get_terminal_dimension(&c, &l);
fprintf(stderr, "tty cols: %d\n", c);
fprintf(stderr, "tty lines: %d\n", l);
return EXIT_SUCCESS;
}
#endif /* TEST_PROGRAM_TTYUTILS */
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