Implement clock

examples/MODULE.bazel

@@ -28,9 +28,6 @@ register_toolchains(
     dev_dependency = True,
 )
 
-# Utility for testing C++ code
-bazel_dep(name = "googletest", version = "1.15.2", dev_dependency = True)
-
 # `clang_tools` for clang-tidy
 bazel_dep(name = "clang_tools", version = "", dev_dependency = True)
 local_path_override(

examples/cc/BUILD.bazel

@@ -1,25 +0,0 @@
-load(
-    "@libc_replacer//:cc.bzl",
-    "cc_libc_replacer_binary",
-    "cc_libc_replacer_test",
-)
-
-cc_libc_replacer_binary(
-    name = "time_test_binary",
-    testonly = True,
-    srcs = ["time_test.cpp"],
-    deps = ["@googletest//:gtest_main"],
-)
-
-cc_libc_replacer_test(
-    name = "time_test",
-    timeout = "short",
-    srcs = ["time_test.cpp"],
-    deps = ["@googletest//:gtest_main"],
-)
-
-sh_test(
-    name = "binary_test",
-    timeout = "short",
-    srcs = [":time_test_binary"],
-)

examples/cc/clock/BUILD.bazel

@@ -0,0 +1,23 @@
+load(
+    "@libc_replacer//:cc.bzl",
+    "cc_libc_replacer_binary",
+    "cc_libc_replacer_test",
+)
+
+cc_libc_replacer_binary(
+    name = "test_binary",
+    testonly = True,
+    srcs = ["test.c"],
+)
+
+cc_libc_replacer_test(
+    name = "test",
+    timeout = "short",
+    srcs = ["test.c"],
+)
+
+sh_test(
+    name = "binary_test",
+    timeout = "short",
+    srcs = [":test_binary"],
+)

examples/cc/clock/test.c

@@ -0,0 +1,17 @@
+#include <libc_replacer/cc/interface.h>
+
+#include <assert.h>
+#include <time.h>
+
+static clock_t mock_clock(void) { return 123.0; }
+
+int main(void) {
+  libc_replacer_overwrite_clock(mock_clock);
+  const clock_t got = clock();
+  libc_replacer_reset_clock();
+  assert(got == 123.0);
+  const clock_t got_after_reset = clock();
+  assert(got_after_reset != 123.0);
+
+  return 0;
+}

examples/cc/time/BUILD.bazel

@@ -0,0 +1,23 @@
+load(
+    "@libc_replacer//:cc.bzl",
+    "cc_libc_replacer_binary",
+    "cc_libc_replacer_test",
+)
+
+cc_libc_replacer_binary(
+    name = "test_binary",
+    testonly = True,
+    srcs = ["test.c"],
+)
+
+cc_libc_replacer_test(
+    name = "test",
+    timeout = "short",
+    srcs = ["test.c"],
+)
+
+sh_test(
+    name = "binary_test",
+    timeout = "short",
+    srcs = [":test_binary"],
+)

examples/cc/time/test.c

@@ -0,0 +1,20 @@
+#include <libc_replacer/cc/interface.h>
+
+#include <assert.h>
+#include <time.h>
+
+static time_t mock_time(time_t *tloc) {
+  (void)tloc;
+  return 123;
+}
+
+int main(void) {
+  libc_replacer_overwrite_time(mock_time);
+  const time_t got = time(NULL);
+  libc_replacer_reset_time();
+  assert(got == 123);
+  const time_t got_after_reset = time(NULL);
+  assert(got_after_reset != 123);
+
+  return 0;
+}

libc_replacer/cc/BUILD.bazel

@@ -9,6 +9,7 @@ cc_library(
     include_prefix = "libc_replacer/cc",
     visibility = ["//visibility:public"],
     deps = [
+        "//libc_replacer/cc/clock",
         "//libc_replacer/cc/time",
     ],
 )

libc_replacer/cc/clock/BUILD.bazel

@@ -0,0 +1,11 @@
+"""C/C++ implementations to replace `clock`.
+"""
+
+cc_library(
+    name = "clock",
+    srcs = ["clock.c"],
+    hdrs = ["clock.h"],
+    linkopts = ["-Wl,-wrap=clock"],
+    visibility = ["//libc_replacer/cc:__pkg__"],
+    deps = ["//libc_replacer/cc/internal"],
+)

libc_replacer/cc/clock/clock.c

@@ -0,0 +1,6 @@
+#include "libc_replacer/cc/clock/clock.h" // IWYU pragma: associated
+#include "libc_replacer/cc/internal/definition_helper.h"
+
+#include <time.h>
+
+LIBC_REPLACER_INTERNAL_DEFINE(clock, clock_t, (void, ))

libc_replacer/cc/clock/clock.h

@@ -0,0 +1,10 @@
+#ifndef INCLUDE_GUARD_LIBC_REPLACER_CC_TIME_CLOCK_H_
+#define INCLUDE_GUARD_LIBC_REPLACER_CC_TIME_CLOCK_H_
+
+#include "libc_replacer/cc/internal/declaration_helper.h"
+
+#include <time.h>
+
+LIBC_REPLACER_INTERNAL_DECLARE(clock, clock_t, (void, ))
+
+#endif // INCLUDE_GUARD_LIBC_REPLACER_CC_TIME_CLOCK_H_

libc_replacer/cc/interface.h

@@ -2,6 +2,7 @@
 #define INCLUDE_GUARD_LIBC_REPLACER_CC_INTERFACE_H_
 
 // IWYU pragma: begin_exports
+#include "libc_replacer/cc/clock/clock.h"
 #include "libc_replacer/cc/time/time.h"
 // IWYU pragma: end_exports