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Refactor screen_init(), preparing for migration to libite

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Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
This commit is contained in:
Joachim Nilsson
2017-07-07 23:00:27 +02:00
parent 99f3f0291a
commit 0b43d0dc70
1 changed files with 33 additions and 29 deletions
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src/util.c
+33 -29
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@@ -32,7 +32,6 @@
#include <termios.h>
#endif
int screen_setup = -1;
int screen_rows = 24;
int screen_cols = 80;
char *prognm = NULL;
@@ -79,51 +78,56 @@ char *sanitize(char *arg, size_t len)
return NULL;
}
#define ESC "\033"
void screen_init(void)
static void initscr(int *row, int *col)
{
#ifdef HAVE_TERMIOS_H
char buf[42];
if (!row || !col)
return;
#if defined(TCSANOW) && defined(POLLIN)
struct termios tc, saved;
struct pollfd fd = { STDIN_FILENO, POLLIN, 0 };
if (screen_setup != -1)
return;
memset(buf, 0, sizeof(buf));
/* 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);
fprintf(stderr, ESC "7" ESC "[r" ESC "[999;999H" ESC "[6n");
if (poll(&fd, 1, 300) > 0) {
int row, col;
/*
* 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");
if (scanf(ESC "[%d;%dR", &row, &col) == 2) {
screen_rows = row;
screen_cols = col;
screen_setup = 1;
}
/*
* 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;
}
fprintf(stderr, ESC "8");
tcsetattr(STDERR_FILENO, TCSANOW, &saved);
#endif
/*
* Restore above saved cursor pos+attr
*/
fprintf(stderr, "\e8");
if (screen_cols > 132)
screen_cols = 132;
/* Restore terminal */
tcsetattr(STDERR_FILENO, TCSANOW, &saved);
return;
#else
*row = 24;
*col = 80;
#endif
}
int screen_width(void)
void screen_init(void)
{
screen_init();
if (screen_cols < 1)
return 80;
return screen_cols;
initscr(&screen_rows, &screen_cols);
}
/**