From 184157ac185c981d9511e7a36ba21d35f29c0032 Mon Sep 17 00:00:00 2001
From: Mitja Felicijan <mitja.felicijan@gmail.com>
Date: Sat, 17 Jan 2026 02:21:19 +0100
Subject: Add command-line option to set startup breakpoints

---
 README.md |  7 +++++++
 tdbg.cpp  | 16 ++++++++++++++--
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 7f37fdf..e28f4ed 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,13 @@ Example with arguments and environment variables:
 ./tdbg ./example -e MYENV=qwe -- arg1 arg2 arg3
 ```
 
+Example with breakpoints:
+
+```sh
+./tdbg ./example -b main
+./tdbg ./example -b example.c:54 -b example.c:60
+```
+
 ### Interactive Commands
 
 | Key | Action                                                            |
diff --git a/tdbg.cpp b/tdbg.cpp
index 7b0e6d0..f66f35a 100644
--- a/tdbg.cpp
+++ b/tdbg.cpp
@@ -672,6 +672,7 @@ void draw_status_bar(SBProcess &process, InputMode mode, int width, int height)
 
 int main(int argc, char** argv) {
 	std::vector<std::string> target_env;
+	std::vector<std::string> startup_breakpoints;
 	std::vector<std::string> debuggee_args;
 	std::string target_path;
 
@@ -679,6 +680,8 @@ int main(int argc, char** argv) {
 		std::string arg = argv[i];
 		if (arg == "-e" && i + 1 < argc) {
 			target_env.push_back(argv[++i]);
+		} else if (arg == "-b" && i + 1 < argc) {
+			startup_breakpoints.push_back(argv[++i]);
 		} else if (arg == "--") {
 			for (int j = i + 1; j < argc; ++j) {
 				debuggee_args.push_back(argv[j]);
@@ -692,7 +695,7 @@ int main(int argc, char** argv) {
 	}
 
 	if (target_path.empty()) {
-		std::cerr << "Usage: " << argv[0] << " [-e KEY=VALUE] ... <target_executable> [-- arg1 arg2 ...]\n";
+		std::cerr << "Usage: " << argv[0] << " [-e KEY=VALUE] [-b BREAKPOINT] ... <target_executable> [-- arg1 arg2 ...]\n";
 		return 1;
 	}
 
@@ -712,6 +715,16 @@ int main(int argc, char** argv) {
 		return 1;
 	}
 
+	std::vector<std::string> log_buffer;
+	for (const auto& bp_spec : startup_breakpoints) {
+		SBBreakpoint bp = create_breakpoint(target, bp_spec);
+		if (bp.IsValid() && bp.GetNumLocations() > 0) {
+			log_msg(log_buffer, "Set startup breakpoint: " + bp_spec);
+		} else {
+			log_msg(log_buffer, "Failed to set startup breakpoint: " + bp_spec);
+		}
+	}
+
 	SBProcess process; 
 	SBThread thread;
 
@@ -721,7 +734,6 @@ int main(int argc, char** argv) {
 	InputMode mode = INPUT_MODE_NORMAL;
 	std::string input_buffer;
 	std::string current_source_filename;
-	std::vector<std::string> log_buffer;
 	std::vector<std::string> watch_expressions;
 	int log_scroll_offset = 0;
 	int locals_scroll_offset = 0;
-- 
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