diff --git a/base/include/android-base/parseint.h b/base/include/android-base/parseint.h
index 7415409..2c8570e 100644
--- a/base/include/android-base/parseint.h
+++ b/base/include/android-base/parseint.h
@@ -21,13 +21,15 @@
 #include <stdlib.h>
 
 #include <limits>
+#include <string>
 
 namespace android {
 namespace base {
 
 // Parses the unsigned decimal integer in the string 's' and sets 'out' to
 // that value. Optionally allows the caller to define a 'max' beyond which
-// otherwise valid values will be rejected. Returns boolean success.
+// otherwise valid values will be rejected. Returns boolean success; 'out'
+// is untouched if parsing fails.
 template <typename T>
 bool ParseUint(const char* s, T* out,
                T max = std::numeric_limits<T>::max()) {
@@ -45,10 +47,17 @@
   return true;
 }
 
+// TODO: string_view
+template <typename T>
+bool ParseUint(const std::string& s, T* out,
+               T max = std::numeric_limits<T>::max()) {
+  return ParseUint(s.c_str(), out, max);
+}
+
 // Parses the signed decimal integer in the string 's' and sets 'out' to
 // that value. Optionally allows the caller to define a 'min' and 'max
 // beyond which otherwise valid values will be rejected. Returns boolean
-// success.
+// success; 'out' is untouched if parsing fails.
 template <typename T>
 bool ParseInt(const char* s, T* out,
               T min = std::numeric_limits<T>::min(),
@@ -67,6 +76,14 @@
   return true;
 }
 
+// TODO: string_view
+template <typename T>
+bool ParseInt(const std::string& s, T* out,
+              T min = std::numeric_limits<T>::min(),
+              T max = std::numeric_limits<T>::max()) {
+  return ParseInt(s.c_str(), out, min, max);
+}
+
 }  // namespace base
 }  // namespace android
 
diff --git a/base/parseint_test.cpp b/base/parseint_test.cpp
index 6a3ba31..483b1d3 100644
--- a/base/parseint_test.cpp
+++ b/base/parseint_test.cpp
@@ -19,7 +19,7 @@
 #include <gtest/gtest.h>
 
 TEST(parseint, signed_smoke) {
-  int i;
+  int i = 0;
   ASSERT_FALSE(android::base::ParseInt("x", &i));
   ASSERT_FALSE(android::base::ParseInt("123x", &i));
 
@@ -28,7 +28,7 @@
   ASSERT_TRUE(android::base::ParseInt("-123", &i));
   ASSERT_EQ(-123, i);
 
-  short s;
+  short s = 0;
   ASSERT_TRUE(android::base::ParseInt("1234", &s));
   ASSERT_EQ(1234, s);
 
@@ -39,7 +39,7 @@
 }
 
 TEST(parseint, unsigned_smoke) {
-  unsigned int i;
+  unsigned int i = 0u;
   ASSERT_FALSE(android::base::ParseUint("x", &i));
   ASSERT_FALSE(android::base::ParseUint("123x", &i));
 
@@ -47,7 +47,7 @@
   ASSERT_EQ(123u, i);
   ASSERT_FALSE(android::base::ParseUint("-123", &i));
 
-  unsigned short s;
+  unsigned short s = 0u;
   ASSERT_TRUE(android::base::ParseUint("1234", &s));
   ASSERT_EQ(1234u, s);
 
@@ -58,21 +58,41 @@
 }
 
 TEST(parseint, no_implicit_octal) {
-  int i;
+  int i = 0;
   ASSERT_TRUE(android::base::ParseInt("0123", &i));
   ASSERT_EQ(123, i);
 
-  unsigned int u;
+  unsigned int u = 0u;
   ASSERT_TRUE(android::base::ParseUint("0123", &u));
   ASSERT_EQ(123u, u);
 }
 
 TEST(parseint, explicit_hex) {
-  int i;
+  int i = 0;
   ASSERT_TRUE(android::base::ParseInt("0x123", &i));
   ASSERT_EQ(0x123, i);
 
-  unsigned int u;
+  unsigned int u = 0u;
   ASSERT_TRUE(android::base::ParseUint("0x123", &u));
   ASSERT_EQ(0x123u, u);
 }
+
+TEST(parseint, string) {
+  int i = 0;
+  ASSERT_TRUE(android::base::ParseInt(std::string("123"), &i));
+  ASSERT_EQ(123, i);
+
+  unsigned int u = 0u;
+  ASSERT_TRUE(android::base::ParseUint(std::string("123"), &u));
+  ASSERT_EQ(123u, u);
+}
+
+TEST(parseint, untouched_on_failure) {
+  int i = 123;
+  ASSERT_FALSE(android::base::ParseInt("456x", &i));
+  ASSERT_EQ(123, i);
+
+  unsigned int u = 123u;
+  ASSERT_FALSE(android::base::ParseInt("456x", &u));
+  ASSERT_EQ(123u, u);
+}
diff --git a/base/properties.cpp b/base/properties.cpp
index fab3005..37daf9a 100644
--- a/base/properties.cpp
+++ b/base/properties.cpp
@@ -52,7 +52,7 @@
 T GetIntProperty(const std::string& key, T default_value, T min, T max) {
   T result;
   std::string value = GetProperty(key, "");
-  if (!value.empty() && android::base::ParseInt(value.c_str(), &result, min, max)) return result;
+  if (!value.empty() && android::base::ParseInt(value, &result, min, max)) return result;
   return default_value;
 }
 
@@ -60,7 +60,7 @@
 T GetUintProperty(const std::string& key, T default_value, T max) {
   T result;
   std::string value = GetProperty(key, "");
-  if (!value.empty() && android::base::ParseUint(value.c_str(), &result, max)) return result;
+  if (!value.empty() && android::base::ParseUint(value, &result, max)) return result;
   return default_value;
 }
 
diff --git a/bootstat/boot_event_record_store.cpp b/bootstat/boot_event_record_store.cpp
index 346eada..78be944 100644
--- a/bootstat/boot_event_record_store.cpp
+++ b/bootstat/boot_event_record_store.cpp
@@ -59,7 +59,7 @@
   // Ignore existing bootstat records (which do not contain file content).
   if (!content.empty()) {
     int32_t value;
-    if (android::base::ParseInt(content.c_str(), &value)) {
+    if (android::base::ParseInt(content, &value)) {
       bootstat::LogHistogram("bootstat_mtime_matches_content", value == *uptime);
     }
   }
diff --git a/bootstat/bootstat.cpp b/bootstat/bootstat.cpp
index 0ab4c98..e5ddab3 100644
--- a/bootstat/bootstat.cpp
+++ b/bootstat/bootstat.cpp
@@ -60,7 +60,7 @@
   BootEventRecordStore boot_event_store;
   if (!value_str.empty()) {
     int32_t value = 0;
-    if (android::base::ParseInt(value_str.c_str(), &value)) {
+    if (android::base::ParseInt(value_str, &value)) {
       boot_event_store.AddBootEventWithValue(event, value);
     }
   } else {
@@ -193,7 +193,7 @@
 
   std::string build_date_str = GetProperty("ro.build.date.utc");
   int32_t build_date;
-  if (!android::base::ParseInt(build_date_str.c_str(), &build_date)) {
+  if (!android::base::ParseInt(build_date_str, &build_date)) {
     return std::string();
   }
 
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index d6b631f..4cd423a 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -755,7 +755,7 @@
     max_download_size = android::base::Trim(max_download_size);
 
     uint64_t limit;
-    if (!android::base::ParseUint(max_download_size.c_str(), &limit)) {
+    if (!android::base::ParseUint(max_download_size, &limit)) {
         fprintf(stderr, "couldn't parse max-download-size '%s'\n", max_download_size.c_str());
         return 0;
     }
@@ -903,7 +903,7 @@
     if (!fb_getvar(transport, "slot-count", &var)) {
         if (supports_AB_obsolete(transport)) return 2; // Legacy support
     }
-    if (!android::base::ParseInt(var.c_str(), &count)) return 0;
+    if (!android::base::ParseInt(var, &count)) return 0;
     return count;
 }
 
@@ -1362,7 +1362,7 @@
     }
 
     int64_t size;
-    if (!android::base::ParseInt(partition_size.c_str(), &size)) {
+    if (!android::base::ParseInt(partition_size, &size)) {
         fprintf(stderr, "Couldn't parse partition size '%s'.\n", partition_size.c_str());
         return;
     }
diff --git a/healthd/BatteryMonitor.cpp b/healthd/BatteryMonitor.cpp
index f81e7d9..0c90a54 100644
--- a/healthd/BatteryMonitor.cpp
+++ b/healthd/BatteryMonitor.cpp
@@ -29,6 +29,7 @@
 #include <memory>
 
 #include <android-base/file.h>
+#include <android-base/parseint.h>
 #include <android-base/strings.h>
 #include <batteryservice/BatteryService.h>
 #include <cutils/klog.h>
@@ -182,7 +183,7 @@
     int value = 0;
 
     if (readFromFile(path, &buf) > 0)
-        value = std::stoi(buf.c_str(), NULL, 0);
+        android::base::ParseInt(buf, &value);
 
     return value;
 }
diff --git a/init/builtins.cpp b/init/builtins.cpp
index f4ba018..da4b84e 100644
--- a/init/builtins.cpp
+++ b/init/builtins.cpp
@@ -304,7 +304,7 @@
     /* mkdir <path> [mode] [owner] [group] */
 
     if (args.size() >= 3) {
-        mode = std::stoul(args[2], 0, 8);
+        mode = std::strtoul(args[2].c_str(), 0, 8);
     }
 
     ret = make_dir(args[1].c_str(), mode);
@@ -637,10 +637,13 @@
 static int do_setrlimit(const std::vector<std::string>& args) {
     struct rlimit limit;
     int resource;
-    resource = std::stoi(args[1]);
-    limit.rlim_cur = std::stoi(args[2]);
-    limit.rlim_max = std::stoi(args[3]);
-    return setrlimit(resource, &limit);
+    if (android::base::ParseInt(args[1], &resource) &&
+        android::base::ParseUint(args[2], &limit.rlim_cur) &&
+        android::base::ParseUint(args[3], &limit.rlim_max)) {
+        return setrlimit(resource, &limit);
+    }
+    LOG(WARNING) << "ignoring setrlimit " << args[1] << " " << args[2] << " " << args[3];
+    return -1;
 }
 
 static int do_start(const std::vector<std::string>& args) {
@@ -709,7 +712,7 @@
     std::string timeout = property_get("ro.build.shutdown_timeout");
     unsigned int delay = 0;
 
-    if (android::base::ParseUint(timeout.c_str(), &delay) && delay > 0) {
+    if (android::base::ParseUint(timeout, &delay) && delay > 0) {
         Timer t;
         // Ask all services to terminate.
         ServiceManager::GetInstance().ForEachService(
@@ -764,13 +767,11 @@
 }
 
 static int do_sysclktz(const std::vector<std::string>& args) {
-    struct timezone tz;
-
-    memset(&tz, 0, sizeof(tz));
-    tz.tz_minuteswest = std::stoi(args[1]);
-    if (settimeofday(NULL, &tz))
-        return -1;
-    return 0;
+    struct timezone tz = {};
+    if (android::base::ParseInt(args[1], &tz.tz_minuteswest) && settimeofday(NULL, &tz) != -1) {
+        return 0;
+    }
+    return -1;
 }
 
 static int do_verity_load_state(const std::vector<std::string>& args) {
@@ -914,7 +915,8 @@
 
 static int do_loglevel(const std::vector<std::string>& args) {
     // TODO: support names instead/as well?
-    int log_level = std::stoi(args[1]);
+    int log_level = -1;
+    android::base::ParseInt(args[1], &log_level);
     android::base::LogSeverity severity;
     switch (log_level) {
         case 7: severity = android::base::DEBUG; break;
@@ -947,9 +949,12 @@
     if (args.size() == 2) {
         return wait_for_file(args[1].c_str(), COMMAND_RETRY_TIMEOUT);
     } else if (args.size() == 3) {
-        return wait_for_file(args[1].c_str(), std::stoi(args[2]));
-    } else
-        return -1;
+        int timeout;
+        if (android::base::ParseInt(args[2], &timeout)) {
+            return wait_for_file(args[1].c_str(), timeout);
+        }
+    }
+    return -1;
 }
 
 /*
diff --git a/init/service.cpp b/init/service.cpp
index 503d84f..22fb013 100644
--- a/init/service.cpp
+++ b/init/service.cpp
@@ -31,6 +31,7 @@
 #include <selinux/selinux.h>
 
 #include <android-base/file.h>
+#include <android-base/parseint.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <cutils/android_reboot.h>
@@ -46,6 +47,7 @@
 #include "property_service.h"
 #include "util.h"
 
+using android::base::ParseInt;
 using android::base::StringPrintf;
 using android::base::WriteStringToFile;
 
@@ -351,22 +353,19 @@
 }
 
 bool Service::ParsePriority(const std::vector<std::string>& args, std::string* err) {
-    priority_ = std::stoi(args[1]);
-
-    if (priority_ < ANDROID_PRIORITY_HIGHEST || priority_ > ANDROID_PRIORITY_LOWEST) {
-        priority_ = 0;
+    priority_ = 0;
+    if (!ParseInt(args[1], &priority_,
+                  static_cast<int>(ANDROID_PRIORITY_LOWEST),
+                  static_cast<int>(ANDROID_PRIORITY_HIGHEST))) {
         *err = StringPrintf("process priority value must be range %d - %d",
                 ANDROID_PRIORITY_HIGHEST, ANDROID_PRIORITY_LOWEST);
         return false;
     }
-
     return true;
 }
 
 bool Service::ParseIoprio(const std::vector<std::string>& args, std::string* err) {
-    ioprio_pri_ = std::stoul(args[2], 0, 8);
-
-    if (ioprio_pri_ < 0 || ioprio_pri_ > 7) {
+    if (!ParseInt(args[2], &ioprio_pri_, 0, 7)) {
         *err = "priority value must be range 0 - 7";
         return false;
     }
@@ -387,7 +386,12 @@
 
 bool Service::ParseKeycodes(const std::vector<std::string>& args, std::string* err) {
     for (std::size_t i = 1; i < args.size(); i++) {
-        keycodes_.emplace_back(std::stoi(args[i]));
+        int code;
+        if (ParseInt(args[i], &code)) {
+            keycodes_.emplace_back(code);
+        } else {
+            LOG(WARNING) << "ignoring invalid keycode: " << args[i];
+        }
     }
     return true;
 }
@@ -420,17 +424,13 @@
 }
 
 bool Service::ParseOomScoreAdjust(const std::vector<std::string>& args, std::string* err) {
-    oom_score_adjust_ = std::stol(args[1], 0, 10);
-
-    if (oom_score_adjust_ < -1000 || oom_score_adjust_ > 1000) {
+    if (!ParseInt(args[1], &oom_score_adjust_, -1000, 1000)) {
         *err = "oom_score_adjust value must be in range -1000 - +1000";
         return false;
     }
-
     return true;
 }
 
-
 bool Service::ParseSeclabel(const std::vector<std::string>& args, std::string* err) {
     seclabel_ = args[1];
     return true;
@@ -448,7 +448,7 @@
         return false;
     }
 
-    int perm = std::stoul(args[3], 0, 8);
+    int perm = std::strtoul(args[3].c_str(), 0, 8);
     uid_t uid = args.size() > 4 ? decode_uid(args[4].c_str()) : 0;
     gid_t gid = args.size() > 5 ? decode_uid(args[5].c_str()) : 0;
     std::string socketcon = args.size() > 6 ? args[6] : "";