From 0cd6b6c7212727b04174525fc1710f6178cf94c4 Mon Sep 17 00:00:00 2001
From: Michal Sytko <michal.sytko@de.bosch.com>
Date: Fri, 9 Oct 2026 13:43:10 +0200
Subject: [PATCH] feat(libc): implement getprogname

---
 .../prx/libSceLibcInternal/CMakeLists.txt     | 10 +++++++
 core/libs/prx/libSceLibcInternal/Export.cpp   |  5 ++++
 core/libs/tests/GuestProgramName.cpp          | 30 +++++++++++++++++++
 3 files changed, 45 insertions(+)
 create mode 100644 core/libs/tests/GuestProgramName.cpp

diff --git a/core/libs/prx/libSceLibcInternal/CMakeLists.txt b/core/libs/prx/libSceLibcInternal/CMakeLists.txt
index 2c0060756b6..61df7b27589 100644
--- a/core/libs/prx/libSceLibcInternal/CMakeLists.txt
+++ b/core/libs/prx/libSceLibcInternal/CMakeLists.txt
@@ -4,6 +4,16 @@ target_link_libraries(libSceLibcInternal PRIVATE ${CMAKE_DL_LIBS})
 configure_windows_unwind(libSceLibcInternal)
 
 if(BUILD_TESTING)
+    add_test_executable(guest_program_name_tests ${LIBS_INCLUDE_DIR}/tests/GuestProgramName.cpp)
+    target_include_directories(guest_program_name_tests PRIVATE ${LIBS_INCLUDE_DIR})
+    target_link_libraries(guest_program_name_tests PRIVATE libSceLibcInternal libkernel libc)
+    configure_windows_unwind(guest_program_name_tests)
+    add_test(NAME guest_program_name COMMAND guest_program_name_tests)
+    set_tests_properties(guest_program_name PROPERTIES TIMEOUT 10)
+    if(WIN32)
+        set_tests_properties(guest_program_name PROPERTIES ENVIRONMENT_MODIFICATION
+            "PATH=path_list_prepend:$<TARGET_FILE_DIR:libSceLibcInternal>")
+    endif()
     add_test_executable(guest_thread_atexit_tests ${LIBS_INCLUDE_DIR}/tests/GuestThreadAtexit.cpp)
     target_include_directories(guest_thread_atexit_tests PRIVATE ${LIBS_INCLUDE_DIR})
     target_link_libraries(guest_thread_atexit_tests PRIVATE libSceLibcInternal libkernel libc)
diff --git a/core/libs/prx/libSceLibcInternal/Export.cpp b/core/libs/prx/libSceLibcInternal/Export.cpp
index f9425b744f8..43acde471d7 100644
--- a/core/libs/prx/libSceLibcInternal/Export.cpp
+++ b/core/libs/prx/libSceLibcInternal/Export.cpp
@@ -15,6 +15,7 @@
 
 extern "C" void APS5_VABI sceKernelSetThreadDtors(thread_dtors_func_t dtors);
 extern "C" int APS5_VABI sceKernelGetModuleInfoFromAddr(std::uint64_t address, int flags, ModuleInfoEx* info);
+extern "C" const char* __progname_nid_postfix;
 
 namespace {
 
@@ -104,6 +105,10 @@ extern "C" {
 
 int Need_sceLibcInternal_nid_postfix = 1;
 
+const char* APS5_VABI getprogname_nid_postfix() {
+    return __progname_nid_postfix;
+}
+
 void APS5_VABI __cxa_finalize_nid_postfix(void* dsoHandle) {
     CxaFinalize_nid_no_patch(dsoHandle);
 }
diff --git a/core/libs/tests/GuestProgramName.cpp b/core/libs/tests/GuestProgramName.cpp
new file mode 100644
index 00000000000..0c402027e84
--- /dev/null
+++ b/core/libs/tests/GuestProgramName.cpp
@@ -0,0 +1,30 @@
+#include "SceTypes.hpp"
+#include <cstdlib>
+#include <cstring>
+
+extern "C" {
+const char* APS5_VABI getprogname_nid_postfix();
+extern const char* __progname_nid_postfix;
+int* APS5_VABI __error_nid_postfix();
+}
+
+static void Require(bool value) { if (!value) std::abort(); }
+
+int main() {
+    const auto* original = __progname_nid_postfix;
+    const auto savedError = *__error_nid_postfix();
+    *__error_nid_postfix() = 45;
+    Require(getprogname_nid_postfix() == original);
+    Require(std::strcmp(getprogname_nid_postfix(), "eboot.bin") == 0);
+    char name[] = "guest-program";
+    __progname_nid_postfix = name;
+    Require(getprogname_nid_postfix() == name);
+    name[0] = 'G';
+    Require(std::strcmp(getprogname_nid_postfix(), "Guest-program") == 0);
+    __progname_nid_postfix = "";
+    Require(getprogname_nid_postfix() == __progname_nid_postfix);
+    Require(*getprogname_nid_postfix() == '\0');
+    Require(*__error_nid_postfix() == 45);
+    __progname_nid_postfix = original;
+    *__error_nid_postfix() = savedError;
+}