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conio.h: Add initscr(), probes terminal rows + cols

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Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
This commit is contained in:
Joachim Nilsson
2017-07-07 13:19:53 +02:00
parent 877ba02d13
commit 6904f6e0fe
1 changed files with 51 additions and 0 deletions
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conio.h
+51
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@@ -84,6 +84,57 @@ static inline void printheader(FILE *fp, const char *line, int nl)
line, SCREEN_WIDTH - (int)strlen(line), "");
}
/* Requries: #inlude <termios.h> and #include <poll.h> */
static inline void initscr(int *row, int *col)
{
#if defined(TCSANOW) && defined(POLLIN)
struct termios tc, saved;
struct pollfd fd = { STDIN_FILENO, POLLIN, 0 };
#endif
if (!row || !col)
return;
#if defined(TCSANOW) && defined(POLLIN)
/* Disable echo to terminal while probing */
tcgetattr(STDERR_FILENO, &tc);
saved = tc;
tc.c_cflag |= (CLOCAL | CREAD);
tc.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
tcsetattr(STDERR_FILENO, TCSANOW, &tc);
/*
* Save cursor pos+attr
* Diable top+bottom margins
* Set cursor at the far bottom,right pos
* Query term for resulting pos
*/
fprintf(stderr, "\e7" "\e[r" "\e[999;999H" "\e[6n");
/*
* Wait here for terminal to echo back \e[row,lineR ...
*/
if (poll(&fd, 1, 300) <= 0 || scanf("\e[%d;%dR", row, col) != 2) {
*row = 24;
*col = 80;
}
/*
* Restore above saved cursor pos+attr
*/
fprintf(stderr, "\e8");
/* Restore terminal */
tcsetattr(STDERR_FILENO, TCSANOW, &saved);
return;
#endif
fallback:
*row = 24;
*col = 80;
}
#endif /* CONIO_H_ */
/**