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