From 855e3c832cb83c68c8e97eb7f73adf92b645efbe Mon Sep 17 00:00:00 2001
From: the lemons <citrons@mondecitronne.com>
Date: Mon, 6 Feb 2023 13:59:02 -0600
Subject: jump to mappings

---
 core.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 52 insertions(+), 2 deletions(-)

diff --git a/core.c b/core.c
index 96ba866..97e0288 100644
--- a/core.c
+++ b/core.c
@@ -22,6 +22,7 @@ static int mouse_y = 0;
 SDL_Window *window = NULL;
 SDL_Renderer *renderer = NULL;
 
+pid_t pid;
 int mem_fd;
 struct viewer *viewer;
 
@@ -35,6 +36,12 @@ static void add_scale(double amount) {
 	pos_y -= mouse_y / scale;
 }
 
+static uintptr_t current_addr() {
+	return to_addr(
+			pos_x + screen_width / 2 * scale,
+			pos_y + screen_width / 2 * scale);
+}
+
 static void goto_addr(uintptr_t addr) {
 	int x, y;
 	to_pos(addr, &x, &y);
@@ -43,6 +50,40 @@ static void goto_addr(uintptr_t addr) {
 	pos_y -= (double) screen_height / 2 * scale;
 }
 
+static size_t closest_map(struct procfs_map *maps, size_t n, uintptr_t addr) {
+	uintptr_t min = -1;
+	size_t closest;
+	for (size_t i = 0; i < n; i++) {
+		uintptr_t base = maps[i].base;
+		uintptr_t diff = base > addr ? base - addr : addr - base;
+		if (diff < min) {
+			min = diff; closest = i;
+		}
+	}
+	return closest;
+}
+
+static void next_map() {
+	struct procfs_map *maps;
+	int n = procfs_maps(pid, &maps);
+	if (n < 1) return;
+	size_t m = closest_map(maps, n, current_addr());
+	goto_addr(maps[(m + 1) % n].base);
+	free(maps);
+}
+
+static void prev_map() {
+	struct procfs_map *maps;
+	int n = procfs_maps(pid, &maps);
+	if (n < 1) return;
+	size_t m = closest_map(maps, n, current_addr());
+	if (m != 0)
+		goto_addr(maps[m - 1].base);
+	else
+		goto_addr(maps[n - 1].base);
+	free(maps);
+}
+
 static void report_error() {
 	fprintf(stderr, "SDL Error: %s\n", SDL_GetError());
 	exit(-1);
@@ -101,6 +142,15 @@ static void handle_events() {
 				add_scale((double) e.wheel.y / 2);
 				refresh = true;
 				break;
+			case SDL_KEYDOWN:
+				switch (e.key.keysym.sym) {
+					case SDLK_RIGHT:
+						next_map();
+						break;
+					case SDLK_LEFT:
+						prev_map();
+						break;
+				}
 			default:
 				break;
 		}
@@ -120,7 +170,7 @@ int main(int argc, char *argv[]) {
 		fprintf(stderr, "todo: show usage\n");
 		return -1;
 	}
-	int pid = atoi(argv[1]);
+	pid = atoi(argv[1]);
 	if (pid == 0) {
 		fprintf(stderr, "todo: show usage\n");
 		return -1;
@@ -135,7 +185,7 @@ int main(int argc, char *argv[]) {
 	if (!viewer) abort();
 	atexit(cleanup);
 
-	goto_addr(0x7fea87727000);
+	next_map();
 
 	int last_time = 0;
 	int current_time = 0;
-- 
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