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-rw-r--r--src/memview.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/src/memview.c b/src/memview.c
index 07c50b1..422789b 100644
--- a/src/memview.c
+++ b/src/memview.c
@@ -152,6 +152,13 @@ static struct {
struct { unsigned int x; unsigned int y; } cur;
} term;
+ // kind of hack, lets make real action history someday
+ // but for now, I want u to work at least for offsets
+ struct {
+ size_t data[32];
+ unsigned char pointer;
+ } undo;
+
struct {
char data[255];
unsigned char pointer;
@@ -202,6 +209,17 @@ hex_for_byte(unsigned char byte)
return hex[byte];
}
+static void
+store_offset(const size_t offset)
+{
+ if (ctx.undo.pointer > 0 && offset == ctx.undo.data[0])
+ return;
+
+ memmove(ctx.undo.data + 1, ctx.undo.data, ctx.undo.pointer * sizeof(ctx.undo.data[0]));
+ ctx.undo.data[0] = ctx.last_hexview.offset;
+ ctx.undo.pointer += (ctx.undo.pointer < ARRAY_SIZE(ctx.undo.data));
+}
+
static bool
offset_is_in_named_region(const size_t offset, const struct named_region *named)
{
@@ -739,6 +757,8 @@ goto_offset(void *arg)
return;
}
+ store_offset(ctx.hexview.offset);
+
if (v[0] == '+') {
ctx.hexview.offset += ret;
} else if (v[0] == '-') {
@@ -752,6 +772,7 @@ static void
follow(void *arg)
{
(void)arg;
+ store_offset(ctx.hexview.offset);
const union selection v = get_selection();
switch (ctx.native_bits) {
case 64: ctx.hexview.offset = v.u64; break;
@@ -762,6 +783,17 @@ follow(void *arg)
}
static void
+undo(void *arg)
+{
+ (void)arg;
+ if (!ctx.undo.pointer)
+ return;
+
+ ctx.hexview.offset = ctx.undo.data[0];
+ memmove(ctx.undo.data, ctx.undo.data + 1, --ctx.undo.pointer * sizeof(ctx.undo.data[0]));
+}
+
+static void
write_bytes(void *arg)
{
(void)arg;
@@ -923,6 +955,7 @@ main(int argc, char *argv[])
{ .seq = { 'q', 0 }, .fun = q_quit },
{ .seq = { 'o', 0 }, .fun = goto_offset },
{ .seq = { 'f', 0 }, .fun = follow },
+ { .seq = { 'u', 0 }, .fun = undo },
{ .seq = { 'w', 0 }, .fun = write_bytes },
};