Move resolving names to qfilesystemengine

Resolve username and group names code is now in the QFileSystemEngine

Reviewed-by: João Abecasis

1 files changed, 51 insertions, 2 deletions

diff --git a/src/corelib/io/qfilesystemengine_unix.cpp b/src/corelib/io/qfilesystemengine_unix.cpp
index c17d4c72a4..1dee09b2ee 100644
--- a/src/corelib/io/qfilesystemengine_unix.cpp
+++ b/src/corelib/io/qfilesystemengine_unix.cpp
@@ -45,6 +45,8 @@
 #include "qfsfileengine.h"
 #include "qfile.h"
 
+#include <QtCore/qvarlengtharray.h>
+
 #include <stdlib.h> // for realpath()
 #include <unistd.h>
 #include <stdio.h>
@@ -275,13 +277,60 @@ QFileSystemEntry QFileSystemEngine::absoluteName(const QFileSystemEntry &entry)
 //static
 QString QFileSystemEngine::resolveUserName(uint userId)
 {
-    return QString(); // TODO
+#if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS) && !defined(Q_OS_OPENBSD)
+    int size_max = sysconf(_SC_GETPW_R_SIZE_MAX);
+    if (size_max == -1)
+        size_max = 1024;
+    QVarLengthArray<char, 1024> buf(size_max);
+#endif
+
+    struct passwd *pw = 0;
+#if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS) && !defined(Q_OS_OPENBSD)
+    struct passwd entry;
+    getpwuid_r(userId, &entry, buf.data(), buf.size(), &pw);
+#else
+    pw = getpwuid(userId);
+#endif
+    if (pw)
+        return QFile::decodeName(QByteArray(pw->pw_name));
+    return QString();
 }
 
 //static
 QString QFileSystemEngine::resolveGroupName(uint groupId)
 {
-    return QString(); // TODO
+#if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS) && !defined(Q_OS_OPENBSD)
+    int size_max = sysconf(_SC_GETPW_R_SIZE_MAX);
+    if (size_max == -1)
+        size_max = 1024;
+    QVarLengthArray<char, 1024> buf(size_max);
+#endif
+
+#if !defined(Q_OS_SYMBIAN)
+    struct group *gr = 0;
+#if !defined(QT_NO_THREAD) && defined(_POSIX_THREAD_SAFE_FUNCTIONS) && !defined(Q_OS_OPENBSD)
+    size_max = sysconf(_SC_GETGR_R_SIZE_MAX);
+    if (size_max == -1)
+        size_max = 1024;
+    buf.resize(size_max);
+    struct group entry;
+    // Some large systems have more members than the POSIX max size
+    // Loop over by doubling the buffer size (upper limit 250k)
+    for (unsigned size = size_max; size < 256000; size += size)
+    {
+        buf.resize(size);
+        // ERANGE indicates that the buffer was too small
+        if (!getgrgid_r(groupId, &entry, buf.data(), buf.size(), &gr)
+            || errno != ERANGE)
+            break;
+    }
+#else
+    gr = getgrgid(groupId);
+#endif
+    if (gr)
+        return QFile::decodeName(QByteArray(gr->gr_name));
+#endif
+    return QString();
 }
 
 //static