From b8dfad4117495b896ab2f40a4df1f696173aa646 Mon Sep 17 00:00:00 2001
From: Tim Chevalier <tjc@igalia.com>
Date: Wed, 31 Jul 2024 18:41:00 -0700
Subject: [PATCH] Avoid using stat() when searching for testdata directory

---
 icu4c/source/test/intltest/intltest.cpp | 40 +++++++++++++++++--------
 1 file changed, 27 insertions(+), 13 deletions(-)

diff --git a/icu4c/source/test/intltest/intltest.cpp b/icu4c/source/test/intltest/intltest.cpp
index d42b12d48ad4..59cae12c9a90 100644
--- a/icu4c/source/test/intltest/intltest.cpp
+++ b/icu4c/source/test/intltest/intltest.cpp
@@ -20,7 +20,6 @@
 #include <string.h>
 #include <cmath>
 #include <math.h>
-#include <sys/stat.h>
 
 #include "unicode/ctest.h" // for str_timeDelta
 #include "unicode/curramt.h"
@@ -1680,24 +1679,36 @@ const char *IntlTest::getSourceTestData(UErrorCode& /*err*/) {
     return srcDataDir;
 }
 
-static bool directoryExists(const char* dirName) {
-    struct stat sb;
-    return (stat(dirName, &sb) == 0) && ((sb.st_mode & S_IFMT) == S_IFDIR);
+static bool fileExists(const char* fileName) {
+    // Test for `srcDataDir` existing by checking for `srcDataDir`/message2/valid-tests.json
+    U_ASSERT(fileName != nullptr);
+    FILE *f = fopen(fileName, "r");
+    if (f) {
+        fclose(f);
+        return true;
+    }
+    return false;
 }
 
 /**
  * Returns the path to icu/testdata/
  */
 const char *IntlTest::getSharedTestData(UErrorCode& err) {
+#define SOURCE_TARBALL_TOP U_TOPSRCDIR U_FILE_SEP_STRING ".." U_FILE_SEP_STRING
+#define REPO_TOP SOURCE_TARBALL_TOP ".." U_FILE_SEP_STRING
+#define FILE_NAME U_FILE_SEP_STRING "message2" U_FILE_SEP_STRING "valid-tests.json"
     const char *srcDataDir = nullptr;
+    const char *testFile = nullptr;
     if (U_SUCCESS(err)) {
 #ifdef U_TOPSRCDIR
         // Try U_TOPSRCDIR/../testdata (source tarball)
-        srcDataDir = U_TOPSRCDIR U_FILE_SEP_STRING ".." U_FILE_SEP_STRING "testdata" U_FILE_SEP_STRING;
-        if (!directoryExists(srcDataDir)) {
+        srcDataDir = SOURCE_TARBALL_TOP "testdata" U_FILE_SEP_STRING;
+        testFile = SOURCE_TARBALL_TOP "testdata" FILE_NAME;
+        if (!fileExists(testFile)) {
             // If that doesn't exist, try U_TOPSRCDIR/../../testdata (in-repo)
-            srcDataDir = U_TOPSRCDIR U_FILE_SEP_STRING ".." U_FILE_SEP_STRING ".." U_FILE_SEP_STRING "testdata" U_FILE_SEP_STRING;
-            if (!directoryExists(srcDataDir)) {
+            srcDataDir = REPO_TOP "testdata" U_FILE_SEP_STRING;
+            testFile = REPO_TOP "testdata" FILE_NAME;
+            if (!fileExists(testFile)) {
                 // If neither exists, return null
                 err = U_FILE_ACCESS_ERROR;
                 srcDataDir = nullptr;
@@ -1706,11 +1717,14 @@ const char *IntlTest::getSharedTestData(UErrorCode& err) {
 #else
         // Try ../../../../testdata (if we're in icu/source/test/intltest)
         // and ../../../../../../testdata (if we're in icu/source/test/intltest/Platform/(Debug|Release)
-        srcDataDir = ".." U_FILE_SEP_STRING ".." U_FILE_SEP_STRING ".." U_FILE_SEP_STRING ".." U_FILE_SEP_STRING "testdata" U_FILE_SEP_STRING;
-        if (!directoryExists(srcDataDir)) {
-            srcDataDir = ".." U_FILE_SEP_STRING ".." U_FILE_SEP_STRING ".." U_FILE_SEP_STRING ".." U_FILE_SEP_STRING
-                ".." U_FILE_SEP_STRING ".." U_FILE_SEP_STRING "testdata" U_FILE_SEP_STRING;
-            if (!directoryExists(srcDataDir)) {
+#define TOP ".." U_FILE_SEP_STRING ".." U_FILE_SEP_STRING ".." U_FILE_SEP_STRING ".." U_FILE_SEP_STRING
+#define TOP_TOP ".." U_FILE_SEP_STRING ".." U_FILE_SEP_STRING TOP
+        srcDataDir = TOP "testdata" U_FILE_SEP_STRING;
+        testFile = TOP "testdata" FILE_NAME
+        if (!fileExists(testFile)) {
+            srcDataDir = TOP_TOP "testdata" U_FILE_SEP_STRING;
+            testFile = TOP_TOP "testdata" FILE_NAME;
+            if (!fileExists(testFile)) {
                 err = U_FILE_ACCESS_ERROR;
                 srcDataDir = nullptr;
             }