aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--miscutils/hexedit.c60
1 files changed, 40 insertions, 20 deletions
diff --git a/miscutils/hexedit.c b/miscutils/hexedit.c
index 7e74e1f24..8334181c7 100644
--- a/miscutils/hexedit.c
+++ b/miscutils/hexedit.c
@@ -31,6 +31,7 @@ struct globals {
int fd;
unsigned height;
unsigned row;
+ unsigned pagesize;
uint8_t *baseaddr;
uint8_t *current_byte;
uint8_t *eof_byte;
@@ -45,8 +46,17 @@ struct globals {
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
} while (0)
-/* Hopefully there aren't arches with PAGE_SIZE > 64k */
-#define G_mapsize (64*1024)
+//TODO: move to libbb
+#if defined(__x86_64__) || defined(i386)
+# define G_pagesize 4096
+# define INIT_PAGESIZE() ((void)0)
+#else
+# define G_pagesize (G.pagesize)
+# define INIT_PAGESIZE() ((void)(G.pagesize = getpagesize()))
+#endif
+
+/* hopefully there aren't arches with PAGE_SIZE > 64k */
+#define G_mapsize (64*1024)
/* "12ef5670 (xx )*16 _1_3_5_7_9abcdef\n"NUL */
#define LINEBUF_SIZE (8 + 1 + 3*16 + 16 + 1 + 1 /*paranoia:*/ + 13)
@@ -86,7 +96,7 @@ static int format_line(char *hex, uint8_t *data, off_t offset)
#endif
hex += ofs_pos;
- text = hex + 16*3;
+ text = hex + 16 * 3;
end1 = data + 15;
if ((G.size - offset) > 0) {
end = end1;
@@ -114,28 +124,36 @@ static int format_line(char *hex, uint8_t *data, off_t offset)
return ofs_pos;
}
-static void redraw(void)
+static void redraw(unsigned cursor)
{
uint8_t *data;
off_t offset;
unsigned i, pos;
printf(HOME CLEAR);
- data = G.baseaddr;
- offset = G.offset;
+
+ /* if cursor is past end of screen, how many lines to move down? */
+ i = (cursor / 16) - G.height + 1;
+ if ((int)i < 0)
+ i = 0;
+
+ data = G.baseaddr + i * 16;
+ offset = G.offset + i * 16;
+ cursor -= i * 16;
pos = i = 0;
while (i < G.height) {
char buf[LINEBUF_SIZE];
pos = format_line(buf, data, offset);
printf(
- "\r\n%s" + (!i)*2, /* print \r\n only on 2nd line and later */
+ "\r\n%s" + (!i) * 2, /* print \r\n only on 2nd line and later */
buf
);
data += 16;
offset += 16;
i++;
}
- printf(ESC"[1;%uH", pos + 1); /* position on 1st hex byte in first line */
+
+ printf(ESC"[%u;%uH", 1 + cursor / 16, 1 + pos + (cursor & 0xf) * 3);
}
static void redraw_cur_line(void)
@@ -195,7 +213,7 @@ static int move_mapping_further(void)
if ((G.size - G.offset) < G_mapsize)
return 0; /* can't move mapping even further, it's at the end already */
- pagesize = getpagesize(); /* constant on most arches */
+ pagesize = G_pagesize; /* constant on most arches */
pos = G.current_byte - G.baseaddr;
if (pos >= pagesize) {
/* move offset up until current position is in 1st page */
@@ -219,7 +237,7 @@ static int move_mapping_lower(void)
if (G.offset == 0)
return 0; /* we are at 0 already */
- pagesize = getpagesize(); /* constant on most arches */
+ pagesize = G_pagesize; /* constant on most arches */
pos = G.current_byte - G.baseaddr;
/* move offset down until current position is in last page */
@@ -243,6 +261,7 @@ int hexedit_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int hexedit_main(int argc UNUSED_PARAM, char **argv)
{
INIT_G();
+ INIT_PAGESIZE();
get_terminal_width_height(-1, NULL, &G.height);
if (1) {
@@ -263,7 +282,7 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv)
bb_signals(BB_FATAL_SIGS, sig_catcher);
remap(0);
- redraw();
+ redraw(0);
//TODO: //Home/End: start/end of line; '<'/'>': start/end of file
//Backspace: undo
@@ -411,26 +430,27 @@ int hexedit_main(int argc UNUSED_PARAM, char **argv)
{
char buf[sizeof(G.offset)*3 + 4];
printf(ESC"[999;1H" CLEAR_TILL_EOL); /* go to last line */
- if (read_line_input(NULL, "Go to (dec,0Xhex,0oct): ", buf, sizeof(buf)) >= 0) {
+ if (read_line_input(NULL, "Go to (dec,0Xhex,0oct): ", buf, sizeof(buf)) > 0) {
off_t t;
unsigned pgmask;
t = bb_strtoull(buf, NULL, 0);
if (t >= G.size)
t = G.size - 1;
- pgmask = getpagesize() - 1;
+ pgmask = G_pagesize - 1;
cnt = t & pgmask;
t = t & ~(off_t)pgmask;
if (t < 0)
cnt = t = 0;
+ if (t != 0 && cnt < 0x1ff) {
+ /* very close to end of page, possibly to EOF */
+ /* move one page lower */
+ t -= G_pagesize;
+ cnt += G_pagesize;
+ }
G.offset = t;
- remap(cnt & 0xf);
- redraw();
- if (cnt & 0xf)
- printf(ESC"[%uC", (cnt & 0xf) * 3); /* cursor right 3*i */
- cnt >>= 4;
- if (cnt)
- goto k_down;
+ remap(cnt);
+ redraw(cnt);
break;
}
/* EOF/error on input: fall through to exiting */