diff options
Diffstat (limited to 'miscutils/hexedit.c')
| -rw-r--r-- | miscutils/hexedit.c | 79 |
1 files changed, 52 insertions, 27 deletions
diff --git a/miscutils/hexedit.c b/miscutils/hexedit.c index e8bc73b..b8627e8 100644 --- a/miscutils/hexedit.c +++ b/miscutils/hexedit.c @@ -15,19 +15,28 @@ #include "libbb.h" -#define ESC "\033" -#define HOME ESC"[H" -#define CLEAR ESC"[H"ESC"[J" +#define ESC "\033" +#define HOME ESC"[H" +#define CLEAR ESC"[H"ESC"[J" +#define SET_ALT_SCR ESC"[?1049h" +#define POP_ALT_SCR ESC"[?1049l" + +#undef CTRL +#define CTRL(c) ((c) & (uint8_t)~0x60) struct globals { smallint half; + smallint in_read_key; int fd; unsigned height; + unsigned row; uint8_t *addr; uint8_t *current_byte; uint8_t *eof_byte; off_t size; off_t offset; + /* needs to be zero-inited, thus keeping it in G: */ + char read_key_buffer[KEYCODE_BUFFER_SIZE]; struct termios orig_termios; }; #define G (*ptr_to_globals) @@ -41,6 +50,24 @@ struct globals { /* "12ef5670 (xx )*16 _1_3_5_7_9abcdef\n"NUL */ #define LINEBUF_SIZE (8 + 1 + 3*16 + 16 + 1 + 1 /*paranoia:*/ + 13) +static void restore_term(void) +{ + tcsetattr_stdin_TCSANOW(&G.orig_termios); + printf(POP_ALT_SCR); + fflush_all(); +} + +static void sig_catcher(int sig) +{ + if (!G.in_read_key) { + /* now it's not safe to do I/O, just inform the main loop */ + bb_got_signal = sig; + return; + } + restore_term(); + kill_myself_with_sig(sig); +} + static int format_line(char *hex, uint8_t *data, off_t offset) { int ofs_pos; @@ -141,9 +168,10 @@ static void remap(unsigned cur_pos) G.fd, G.offset ); - if (G.addr == MAP_FAILED) -//TODO: restore termios? + if (G.addr == MAP_FAILED) { + restore_term(); bb_perror_msg_and_die("mmap"); + } G.current_byte = G.addr + cur_pos; @@ -201,12 +229,6 @@ static void move_mapping_lower(void) remap(pos); } -static void sig_catcher(int sig) -{ - tcsetattr_stdin_TCSANOW(&G.orig_termios); - kill_myself_with_sig(sig); -} - //usage:#define hexedit_trivial_usage //usage: "FILE" //usage:#define hexedit_full_usage "\n\n" @@ -214,8 +236,6 @@ static void sig_catcher(int sig) int hexedit_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int hexedit_main(int argc UNUSED_PARAM, char **argv) { - unsigned row = 0; - INIT_G(); get_terminal_width_height(-1, NULL, &G.height); @@ -237,7 +257,7 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv) remap(0); - printf(CLEAR); + printf(SET_ALT_SCR); redraw(); printf(ESC"[1;10H"); /* position on 1st hex byte in first line */ @@ -245,21 +265,22 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv) //Backspace: undo //Enter: goto specified position //Ctrl-L: redraw - //Ctrl-X: save and exit (maybe also Q?) //Ctrl-Z: suspend //'/', Ctrl-S: search -//TODO: go to end-of-screen on exit (for this, sighandler should interrupt read_key()) //TODO: detect window resize -//TODO: read-only mode if open(O_RDWR) fails? hide cursor in this case? for (;;) { - char read_key_buffer[KEYCODE_BUFFER_SIZE]; unsigned cnt; - int32_t key; + int32_t key = key; // for compiler uint8_t byte; fflush_all(); - key = read_key(STDIN_FILENO, read_key_buffer, -1); + G.in_read_key = 1; + if (!bb_got_signal) + key = read_key(STDIN_FILENO, G.read_key_buffer, -1); + G.in_read_key = 0; + if (bb_got_signal) + key = CTRL('X'); cnt = 1; switch (key) { @@ -329,9 +350,9 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv) } down: putchar('\n'); /* down one line, possibly scroll screen */ - row++; - if (row >= G.height) { - row--; + G.row++; + if (G.row >= G.height) { + G.row--; redraw_cur_line(); } if (--cnt) @@ -371,8 +392,8 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv) } G.current_byte -= 16; up: - if (row != 0) { - row--; + if (G.row != 0) { + G.row--; printf(ESC"[A"); /* up (won't scroll) */ } else { //printf(ESC"[T"); /* scroll up */ - not implemented on Linux VT! @@ -382,8 +403,12 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv) if (--cnt) goto k_up; break; - } - } + case CTRL('X'): + restore_term(); + return EXIT_SUCCESS; + } /* switch */ + } /* for (;;) */ + /* not reached */ return EXIT_SUCCESS; } |