hexedit: restore screen on exit
function old new delta hexedit_main 998 1082 +84 restore_term - 29 +29 remap 168 173 +5 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 2/0 up/down: 118/0) Total: 118 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
d72e804e6d
commit
363fb5ec40
@ -18,16 +18,25 @@
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#define ESC "\033"
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#define HOME ESC"[H"
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#define CLEAR ESC"[H"ESC"[J"
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#define SET_ALT_SCR ESC"[?1049h"
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#define POP_ALT_SCR ESC"[?1049l"
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#undef CTRL
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#define CTRL(c) ((c) & (uint8_t)~0x60)
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struct globals {
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smallint half;
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smallint in_read_key;
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int fd;
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unsigned height;
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unsigned row;
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uint8_t *addr;
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uint8_t *current_byte;
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uint8_t *eof_byte;
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off_t size;
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off_t offset;
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/* needs to be zero-inited, thus keeping it in G: */
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char read_key_buffer[KEYCODE_BUFFER_SIZE];
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struct termios orig_termios;
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};
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#define G (*ptr_to_globals)
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@ -41,6 +50,24 @@ struct globals {
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/* "12ef5670 (xx )*16 _1_3_5_7_9abcdef\n"NUL */
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#define LINEBUF_SIZE (8 + 1 + 3*16 + 16 + 1 + 1 /*paranoia:*/ + 13)
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static void restore_term(void)
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{
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tcsetattr_stdin_TCSANOW(&G.orig_termios);
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printf(POP_ALT_SCR);
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fflush_all();
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}
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static void sig_catcher(int sig)
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{
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if (!G.in_read_key) {
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/* now it's not safe to do I/O, just inform the main loop */
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bb_got_signal = sig;
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return;
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}
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restore_term();
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kill_myself_with_sig(sig);
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}
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static int format_line(char *hex, uint8_t *data, off_t offset)
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{
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int ofs_pos;
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@ -141,9 +168,10 @@ static void remap(unsigned cur_pos)
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G.fd,
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G.offset
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);
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if (G.addr == MAP_FAILED)
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//TODO: restore termios?
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if (G.addr == MAP_FAILED) {
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restore_term();
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bb_perror_msg_and_die("mmap");
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}
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G.current_byte = G.addr + cur_pos;
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@ -201,12 +229,6 @@ static void move_mapping_lower(void)
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remap(pos);
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}
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static void sig_catcher(int sig)
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{
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tcsetattr_stdin_TCSANOW(&G.orig_termios);
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kill_myself_with_sig(sig);
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}
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//usage:#define hexedit_trivial_usage
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//usage: "FILE"
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//usage:#define hexedit_full_usage "\n\n"
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@ -214,8 +236,6 @@ static void sig_catcher(int sig)
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int hexedit_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int hexedit_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned row = 0;
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INIT_G();
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get_terminal_width_height(-1, NULL, &G.height);
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@ -237,7 +257,7 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv)
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remap(0);
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printf(CLEAR);
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printf(SET_ALT_SCR);
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redraw();
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printf(ESC"[1;10H"); /* position on 1st hex byte in first line */
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@ -245,21 +265,22 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv)
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//Backspace: undo
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//Enter: goto specified position
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//Ctrl-L: redraw
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//Ctrl-X: save and exit (maybe also Q?)
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//Ctrl-Z: suspend
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//'/', Ctrl-S: search
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//TODO: go to end-of-screen on exit (for this, sighandler should interrupt read_key())
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//TODO: detect window resize
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//TODO: read-only mode if open(O_RDWR) fails? hide cursor in this case?
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for (;;) {
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char read_key_buffer[KEYCODE_BUFFER_SIZE];
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unsigned cnt;
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int32_t key;
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int32_t key = key; // for compiler
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uint8_t byte;
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fflush_all();
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key = read_key(STDIN_FILENO, read_key_buffer, -1);
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G.in_read_key = 1;
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if (!bb_got_signal)
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key = read_key(STDIN_FILENO, G.read_key_buffer, -1);
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G.in_read_key = 0;
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if (bb_got_signal)
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key = CTRL('X');
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cnt = 1;
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switch (key) {
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@ -329,9 +350,9 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv)
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}
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down:
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putchar('\n'); /* down one line, possibly scroll screen */
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row++;
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if (row >= G.height) {
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row--;
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G.row++;
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if (G.row >= G.height) {
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G.row--;
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redraw_cur_line();
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}
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if (--cnt)
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@ -371,8 +392,8 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv)
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}
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G.current_byte -= 16;
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up:
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if (row != 0) {
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row--;
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if (G.row != 0) {
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G.row--;
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printf(ESC"[A"); /* up (won't scroll) */
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} else {
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//printf(ESC"[T"); /* scroll up */ - not implemented on Linux VT!
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@ -382,8 +403,12 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv)
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if (--cnt)
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goto k_up;
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break;
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}
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}
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case CTRL('X'):
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restore_term();
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return EXIT_SUCCESS;
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} /* switch */
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} /* for (;;) */
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/* not reached */
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return EXIT_SUCCESS;
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}
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@ -1103,7 +1103,7 @@ static int64_t getch_nowait(void)
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goto again;
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}
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/* EOF/error (ssh session got killed etc) */
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less_exit(0);
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less_exit(EXIT_SUCCESS);
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}
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set_tty_cooked();
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return key64;
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