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hexedit: smarter redraw

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function                                             old     new   delta
format_line                                          197     209     +12
hexedit_main                                         930     924      -6
redraw_cur_line                                      104      94     -10
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/2 up/down: 12/-16)             Total: -4 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-09-13 21:38:55 +02:00
parent 73af705628
commit 136946c3ea
1 changed files with 41 additions and 26 deletions
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65
miscutils/hexedit.c
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@ -38,11 +38,27 @@ struct globals {
/* Hopefully there aren't arches with PAGE_SIZE > 64k */
#define G_mapsize (64*1024)
static void format_line(char *hex, uint8_t *data, off_t offset)
/* "12ef5670 (nn )*16 abcdef_1_3_5_7_9\n" */
#define LINEBUF_SIZE (8 + 1 + 3*16 + 16 + 1 /*paranoia:*/ + 14)
static int format_line(char *hex, uint8_t *data, off_t offset)
{
char *text = hex + 16*3;
int ofs_pos;
char *text;
uint8_t *end, *end1;
#if 1
/* Can be more than 4Gb, thus >8 chars, thus use a variable - don't assume 8! */
ofs_pos = sprintf(hex, "%08"OFF_FMT"x ", offset);
#else
if (offset <= 0xffff)
ofs_pos = sprintf(hex, "%04"OFF_FMT"x ", offset);
else
ofs_pos = sprintf(hex, "%08"OFF_FMT"x ", offset);
#endif
hex += ofs_pos;
text = hex + 16*3;
end1 = data + 15;
if ((G.size - offset) > 0) {
end = end1;
@ -66,6 +82,8 @@ static void format_line(char *hex, uint8_t *data, off_t offset)
data++;
}
*text = '\0';
return ofs_pos;
}
static void redraw(void)
@ -78,11 +96,11 @@ static void redraw(void)
offset = 0;
i = 0;
while (i < G.height) {
char buf[16*4 + 8];
char buf[LINEBUF_SIZE];
format_line(buf, data, offset);
printf(
"\r\n%08"OFF_FMT"x %s" + (!i)*2, /* print \r\n only on 2nd line and later */
offset, buf
"\r\n%s" + (!i)*2, /* print \r\n only on 2nd line and later */
buf
);
data += 16;
offset += 16;
@ -92,22 +110,22 @@ static void redraw(void)
static void redraw_cur_line(void)
{
off_t offset;
int len;
char buf[16*4 + 8];
char buf[LINEBUF_SIZE];
uint8_t *data;
off_t offset;
int column;
len = (0xf & (uintptr_t)G.current_byte);
data = G.current_byte - len;
column = (0xf & (uintptr_t)G.current_byte);
data = G.current_byte - column;
offset = G.offset + (data - G.addr);
format_line(buf, data, offset);
printf(
"\r%08"OFF_FMT"x %s",
offset, buf
);
printf(
"\r%08"OFF_FMT"x %.*s",
offset, (len*3 + G.half), buf
column = column*3 + G.half;
column += format_line(buf, data, offset);
printf("%s"
"\r"
"%.*s",
buf + column,
column, buf
);
}
@ -216,7 +234,7 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv)
printf(CLEAR);
redraw();
printf(HOME "%08x ", 0);
printf(ESC"[1;10H"); /* position on 1st hex byte in first line */
//TODO: //PgUp/PgDown; Home/End: start/end of line; '<'/'>': start/end of file
//Backspace: undo
@ -229,10 +247,6 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv)
//TODO: detect window resize
//TODO: read-only mode if open(O_RDWR) fails? hide cursor in this case?
//TODO: smarter redraw: if down-arrow is pressed on last visible line,
//emit LF, then print the tail of next line, then CR, then beginning -
//which makes cursor end up exactly where it should be! Same for up-arrow.
for (;;) {
char read_key_buffer[KEYCODE_BUFFER_SIZE];
int32_t key;
@ -320,10 +334,11 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv)
}
if ((0xf & (uintptr_t)G.current_byte) == 0) {
/* leftmost pos, wrap to prev line */
if (G.current_byte == G.addr)
if (G.current_byte == G.addr) {
move_mapping_lower();
if ((G.current_byte - G.addr) < 16)
if (G.current_byte == G.addr)
break; /* first line, don't do anything */
}
G.half = 1;
G.current_byte--;
printf(ESC"[46C"); /* cursor right 3*15 + 1 chars */