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-rw-r--r--toys/other/hexedit.c35
1 files changed, 27 insertions, 8 deletions
diff --git a/toys/other/hexedit.c b/toys/other/hexedit.c
index 7c6a043e..1f6b42e1 100644
--- a/toys/other/hexedit.c
+++ b/toys/other/hexedit.c
@@ -23,11 +23,11 @@ config HEXEDIT
GLOBALS(
char *data;
long long len, base;
- int numlen;
+ int numlen, undo, undolen;
unsigned height;
)
-#define UNDO_LEN (sizeof(toybuf)/(sizeof(long)+1))
+#define UNDO_LEN (sizeof(toybuf)/(sizeof(long long)+1))
// Render all characters printable, using color to distinguish.
static void draw_char(char broiled)
@@ -135,6 +135,7 @@ void hexedit_main(void)
long long pos = 0, y;
int x, i, side = 0, key, ro = toys.optflags&FLAG_r,
fd = xopen(*toys.optargs, ro ? O_RDONLY : O_RDWR);
+ char keybuf[16];
// Terminal setup
TT.height = 25;
@@ -195,26 +196,44 @@ void hexedit_main(void)
xprintf("");
// Wait for next key
- key = scan_key(toybuf, 1);
+ key = scan_key(keybuf, 1);
// Exit for q, ctrl-c, ctrl-d, escape, or EOF
if (key==-1 || key==3 || key==4 || key==27 || key=='q') break;
highlight(x, y, 2);
+ // Hex digit?
if (key>='a' && key<='f') key-=32;
if (!ro && ((key>='0' && key<='9') || (key>='A' && key<='F'))) {
+ if (!side) {
+ long long *ll = (long long *)toybuf;
+
+ ll[TT.undo] = pos;
+ toybuf[(sizeof(long long)*UNDO_LEN)+TT.undo++] = TT.data[pos];
+ if (TT.undolen < UNDO_LEN) TT.undolen++;
+ TT.undo %= UNDO_LEN;
+ }
+
i = key - '0';
if (i>9) i -= 7;
TT.data[pos] &= 15<<(4*side);
TT.data[pos] |= i<<(4*!side);
- highlight(x, y, ++side);
- if (side==2) {
+ if (++side==2) {
+ highlight(x, y, side);
side = 0;
++pos;
}
- }
- if (key>255) side = 0;
- if (key==KEY_UP) pos -= 16;
+ } else side = 0;
+ if (key=='u') {
+ if (TT.undolen) {
+ long long *ll = (long long *)toybuf;
+
+ TT.undolen--;
+ if (!TT.undo) TT.undo = UNDO_LEN;
+ pos = ll[--TT.undo];
+ TT.data[pos] = toybuf[sizeof(long long)*UNDO_LEN+TT.undo];
+ }
+ } else if (key==KEY_UP) pos -= 16;
else if (key==KEY_DOWN) pos += 16;
else if (key==KEY_RIGHT) {
if (x<15) pos++;