From ed334c414dfe784513bc3c495386d103b12f97c3 Mon Sep 17 00:00:00 2001
From: Koutaro Mukai <mukai.k1011k@outlook.jp>
Date: Thu, 30 Mar 2023 01:09:14 +0900
Subject: [PATCH] Implementation of vasprintf emulation (#243)

* Consolidate vasprintf for non _GNU_SOURCE

* va_copy on Visual Studio 2010

* Use vsnprintf_s instead

* Integrate macros into function

* Update platformio-ci image
---
 .circleci/config.yml           |  2 +-
 include/plog/Util.h            | 27 +++++++++++++++++----------
 samples/Arduino/platformio.ini |  5 +++++
 3 files changed, 23 insertions(+), 11 deletions(-)

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 708a765..9eb2284 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -8,7 +8,7 @@ jobs:
       - run: cmake -H. -Bbuild -DCMAKE_TOOLCHAIN_FILE=$CMAKE_TOOLCHAIN_FILE && cd build && make -j
   platformio:
     docker:
-      - image: sergiusthebest/platformio-ci:latest
+      - image: ghcr.io/sergiusthebest/platformio-ci:latest
     steps:
       - checkout
       - run: pio run -d samples/Arduino
diff --git a/include/plog/Util.h b/include/plog/Util.h
index efce8fc..6a11314 100644
--- a/include/plog/Util.h
+++ b/include/plog/Util.h
@@ -189,18 +189,25 @@ namespace plog
 #endif
         }
 
-#ifdef _WIN32
+#ifndef _GNU_SOURCE
     inline int vasprintf(char** strp, const char* format, va_list ap)
     {
-#if defined(__BORLANDC__)
-        int charCount = 0x1000; // there is no _vscprintf on Borland/Embarcadero
+        va_list ap_copy;
+#if defined(_MSC_VER) && _MSC_VER <= 1600
+        ap_copy = ap; // there is no va_copy on Visual Studio 2010
 #else
-        int charCount = _vscprintf(format, ap);
+        va_copy(ap_copy, ap);        
+#endif
+#ifndef __STDC_SECURE_LIB__
+        int charCount = vsnprintf(NULL, 0, format, ap_copy);
+#else
+        int charCount = vsnprintf_s(NULL, 0, static_cast<size_t>(-1), format, ap_copy);
+#endif
+        va_end(ap_copy);
         if (charCount < 0)
         {
             return -1;
         }
-#endif
 
         size_t bufferCharCount = static_cast<size_t>(charCount) + 1;
 
@@ -210,12 +217,10 @@ namespace plog
             return -1;
         }
 
-#if defined(__BORLANDC__)
-        int retval = vsnprintf_s(str, bufferCharCount, format, ap);
-#elif defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
-        int retval = _vsnprintf(str, bufferCharCount, format, ap);
+#ifndef __STDC_SECURE_LIB__
+        int retval = vsnprintf(str, bufferCharCount, format, ap);
 #else
-        int retval = _vsnprintf_s(str, bufferCharCount, charCount, format, ap);
+        int retval = vsnprintf_s(str, bufferCharCount, static_cast<size_t>(-1), format, ap);
 #endif
         if (retval < 0)
         {
@@ -226,7 +231,9 @@ namespace plog
         *strp = str;
         return retval;
     }
+#endif
 
+#ifdef _WIN32
     inline int vaswprintf(wchar_t** strp, const wchar_t* format, va_list ap)
     {
 #if defined(__BORLANDC__)
diff --git a/samples/Arduino/platformio.ini b/samples/Arduino/platformio.ini
index 449d621..b3e60ba 100644
--- a/samples/Arduino/platformio.ini
+++ b/samples/Arduino/platformio.ini
@@ -20,3 +20,8 @@ framework = arduino
 platform = espressif32
 board = esp32dev
 framework = arduino
+
+[env:pico]
+platform = raspberrypi
+board = pico
+framework = arduino