In file included from adb_utils.cpp:19:
adb/adb_utils.h:19:10: fatal error: 'charconv' file not found
#include <charconv>
         ^~~~~~~~~~

--- adb/adb_utils.h.orig	2019-10-18 00:22:21 UTC
+++ adb/adb_utils.h
@@ -16,7 +16,6 @@
 
 #pragma once
 
-#include <charconv>
 #include <condition_variable>
 #include <mutex>
 #include <string>
@@ -113,17 +112,33 @@ inline std::string_view StripTrailingNulls(std::string
 // Base-10 stroll on a string_view.
 template <typename T>
 inline bool ParseUint(T* result, std::string_view str, std::string_view* remaining = nullptr) {
-    T value;
-    const auto res = std::from_chars(str.begin(), str.end(), value);
-    if (res.ec != std::errc{}) {
+    if (str.empty() || !isdigit(str[0])) {
         return false;
     }
-    if (res.ptr != str.end() && !remaining) {
-        return false;
+
+    T value = 0;
+    std::string_view::iterator it;
+    constexpr T max = std::numeric_limits<T>::max();
+    for (it = str.begin(); it != str.end() && isdigit(*it); ++it) {
+        if (value > max / 10) {
+            return false;
+        }
+
+        value *= 10;
+
+        T digit = *it - '0';
+        if (value > max - digit) {
+            return false;
+        }
+
+        value += digit;
     }
+    *result = value;
     if (remaining) {
-        *remaining = std::string_view(res.ptr, str.end() - res.ptr);
+        *remaining = str.substr(it - str.begin());
+    } else {
+      return it == str.end();
     }
-    *result = value;
+
     return true;
 }