From f31ae3d666f6e723a7dde6734c6d8395f8bcdc11 Mon Sep 17 00:00:00 2001
From: Mark Salyzyn <salyzyn@google.com>
Date: Thu, 13 Apr 2017 15:35:22 -0700
Subject: [PATCH] logd: statistics truncate name

Prefix long truncated names with an ellipse (...). Shift left as
much as possible when doing so, but keep spaces between command
name and other tabular fields.

Test: manual/visual
Bug: 37254265
Change-Id: I185b1e121ba911a9410a8b6624e013d5a531962b
---
 logd/LogStatistics.cpp | 61 +++++++++++++++++++++---------------------
 1 file changed, 31 insertions(+), 30 deletions(-)

diff --git a/logd/LogStatistics.cpp b/logd/LogStatistics.cpp
index cc30f7783..d3167ad3a 100644
--- a/logd/LogStatistics.cpp
+++ b/logd/LogStatistics.cpp
@@ -248,18 +248,38 @@ std::string UidEntry::formatHeader(const std::string& name, log_id_t id) const {
                       std::string(isprune ? "NUM" : ""));
 }
 
+// Helper to truncate name, if too long, and add name dressings
+static void formatTmp(const LogStatistics& stat, const char* nameTmp, uid_t uid,
+                      std::string& name, std::string& size, size_t nameLen) {
+    const char* allocNameTmp = nullptr;
+    if (!nameTmp) nameTmp = allocNameTmp = stat.uidToName(uid);
+    if (nameTmp) {
+        size_t lenSpace = std::max(nameLen - name.length(), (size_t)1);
+        size_t len = EntryBaseConstants::total_len -
+                     EntryBaseConstants::pruned_len - size.length() -
+                     name.length() - lenSpace - 2;
+        size_t lenNameTmp = strlen(nameTmp);
+        while ((len < lenNameTmp) && (lenSpace > 1)) {
+            ++len;
+            --lenSpace;
+        }
+        name += android::base::StringPrintf("%*s", (int)lenSpace, "");
+        if (len < lenNameTmp) {
+            name += "...";
+            nameTmp += lenNameTmp - std::max(len - 3, (size_t)1);
+        }
+        name += nameTmp;
+        free(const_cast<char*>(allocNameTmp));
+    }
+}
+
 std::string UidEntry::format(const LogStatistics& stat, log_id_t id) const {
     uid_t uid = getUid();
     std::string name = android::base::StringPrintf("%u", uid);
-    const char* nameTmp = stat.uidToName(uid);
-    if (nameTmp) {
-        name += android::base::StringPrintf(
-            "%*s%s", (int)std::max(6 - name.length(), (size_t)1), "", nameTmp);
-        free(const_cast<char*>(nameTmp));
-    }
-
     std::string size = android::base::StringPrintf("%zu", getSizes());
 
+    formatTmp(stat, nullptr, uid, name, size, 6);
+
     std::string pruned = "";
     if (worstUidEnabledForLogid(id)) {
         size_t totalDropped = 0;
@@ -366,18 +386,10 @@ std::string PidEntry::format(const LogStatistics& stat,
     uid_t uid = getUid();
     pid_t pid = getPid();
     std::string name = android::base::StringPrintf("%5u/%u", pid, uid);
-    const char* nameTmp = getName();
-    if (nameTmp) {
-        name += android::base::StringPrintf(
-            "%*s%s", (int)std::max(12 - name.length(), (size_t)1), "", nameTmp);
-    } else if ((nameTmp = stat.uidToName(uid))) {
-        name += android::base::StringPrintf(
-            "%*s%s", (int)std::max(12 - name.length(), (size_t)1), "", nameTmp);
-        free(const_cast<char*>(nameTmp));
-    }
-
     std::string size = android::base::StringPrintf("%zu", getSizes());
 
+    formatTmp(stat, getName(), uid, name, size, 12);
+
     std::string pruned = "";
     size_t dropped = getDropped();
     if (dropped) {
@@ -398,21 +410,10 @@ std::string TidEntry::format(const LogStatistics& stat,
                              log_id_t /* id */) const {
     uid_t uid = getUid();
     std::string name = android::base::StringPrintf("%5u/%u", getTid(), uid);
-    const char* nameTmp = getName();
-    if (nameTmp) {
-        name += android::base::StringPrintf(
-            "%*s%s", (int)std::max(12 - name.length(), (size_t)1), "", nameTmp);
-    } else if ((nameTmp = stat.uidToName(uid))) {
-        // if we do not have a PID name, lets punt to try UID name?
-        name += android::base::StringPrintf(
-            "%*s%s", (int)std::max(12 - name.length(), (size_t)1), "", nameTmp);
-        free(const_cast<char*>(nameTmp));
-        // We tried, better to not have a name at all, we still
-        // have TID/UID by number to report in any case.
-    }
-
     std::string size = android::base::StringPrintf("%zu", getSizes());
 
+    formatTmp(stat, getName(), uid, name, size, 12);
+
     std::string pruned = "";
     size_t dropped = getDropped();
     if (dropped) {