diff --git a/CMakeLists.txt b/CMakeLists.txt
index 639ea570..1198eced 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -360,7 +360,7 @@ if(MSVC)
       endif()
     endforeach()
   endif()
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /W3 /wd4996")
+  add_definitions(-D_CRT_NONSTDC_NO_WARNINGS)
 endif()
 
 if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID STREQUAL "Clang")
@@ -709,6 +709,8 @@ if(WITH_FUZZ)
   add_subdirectory(fuzz)
 endif()
 
+add_executable(strtest strtest.c)
+
 add_subdirectory(md5)
 
 if(MSVC_IDE OR XCODE)
diff --git a/cjpeg.c b/cjpeg.c
index 41ef5c18..41020a8f 100644
--- a/cjpeg.c
+++ b/cjpeg.c
@@ -5,7 +5,7 @@
  * Copyright (C) 1991-1998, Thomas G. Lane.
  * Modified 2003-2011 by Guido Vollbeding.
  * libjpeg-turbo Modifications:
- * Copyright (C) 2010, 2013-2014, 2017, 2019-2021, D. R. Commander.
+ * Copyright (C) 2010, 2013-2014, 2017, 2019-2022, D. R. Commander.
  * For conditions of distribution and use, see the accompanying README.ijg
  * file.
  *
@@ -27,6 +27,10 @@
  * works regardless of which command line style is used.
  */
 
+#ifdef _MSC_VER
+#define _CRT_SECURE_NO_DEPRECATE
+#endif
+
 #ifdef CJPEG_FUZZER
 #define JPEG_INTERNALS
 #endif
diff --git a/djpeg.c b/djpeg.c
index dfd6d900..5190e687 100644
--- a/djpeg.c
+++ b/djpeg.c
@@ -28,6 +28,10 @@
  * works regardless of which command line style is used.
  */
 
+#ifdef _MSC_VER
+#define _CRT_SECURE_NO_DEPRECATE
+#endif
+
 #include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
 #include "jversion.h"           /* for version message */
 #include "jconfigint.h"
diff --git a/jerror.c b/jerror.c
index 936c4f5d..d5447029 100644
--- a/jerror.c
+++ b/jerror.c
@@ -3,8 +3,8 @@
  *
  * This file was part of the Independent JPEG Group's software:
  * Copyright (C) 1991-1998, Thomas G. Lane.
- * It was modified by The libjpeg-turbo Project to include only code relevant
- * to libjpeg-turbo.
+ * libjpeg-turbo Modifications:
+ * Copyright (C) 2022, D. R. Commander.
  * For conditions of distribution and use, see the accompanying README.ijg
  * file.
  *
@@ -189,13 +189,13 @@ format_message(j_common_ptr cinfo, char *buffer)
 
   /* Format the message into the passed buffer */
   if (isstring)
-    sprintf(buffer, msgtext, err->msg_parm.s);
+    snprintf(buffer, JMSG_LENGTH_MAX, msgtext, err->msg_parm.s);
   else
-    sprintf(buffer, msgtext,
-            err->msg_parm.i[0], err->msg_parm.i[1],
-            err->msg_parm.i[2], err->msg_parm.i[3],
-            err->msg_parm.i[4], err->msg_parm.i[5],
-            err->msg_parm.i[6], err->msg_parm.i[7]);
+    snprintf(buffer, JMSG_LENGTH_MAX, msgtext,
+             err->msg_parm.i[0], err->msg_parm.i[1],
+             err->msg_parm.i[2], err->msg_parm.i[3],
+             err->msg_parm.i[4], err->msg_parm.i[5],
+             err->msg_parm.i[6], err->msg_parm.i[7]);
 }
 
 
diff --git a/jinclude.h b/jinclude.h
index 6ed982d3..120614b2 100644
--- a/jinclude.h
+++ b/jinclude.h
@@ -3,8 +3,8 @@
  *
  * This file was part of the Independent JPEG Group's software:
  * Copyright (C) 1991-1994, Thomas G. Lane.
- * It was modified by The libjpeg-turbo Project to include only code relevant
- * to libjpeg-turbo.
+ * libjpeg-turbo Modifications:
+ * Copyright (C) 2022, D. R. Commander.
  * For conditions of distribution and use, see the accompanying README.ijg
  * file.
  *
@@ -17,10 +17,13 @@
  * JPEG library.  Most applications need only include jpeglib.h.
  */
 
+#ifndef __JINCLUDE_H__
+#define __JINCLUDE_H__
 
 /* Include auto-config file to find out which system include files we need. */
 
 #include "jconfig.h"            /* auto configuration options */
+#include "jconfigint.h"
 #define JCONFIG_INCLUDED        /* so that jpeglib.h doesn't do it again */
 
 /*
@@ -34,3 +37,97 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+
+/*
+ * These macros/inline functions facilitate using Microsoft's "safe string"
+ * functions with Visual Studio builds without the need to scatter #ifdefs
+ * throughout the code base.
+ */
+
+
+#ifndef NO_GETENV
+
+#ifdef _MSC_VER
+
+static INLINE int GETENV_S(char *buffer, size_t buffer_size, const char *name)
+{
+  size_t required_size;
+
+  return (int)getenv_s(&required_size, buffer, buffer_size, name);
+}
+
+#else /* _MSC_VER */
+
+#include <errno.h>
+
+/* This provides a similar interface to the Microsoft/C11 getenv_s() function,
+ * but other than parameter validation, it has no advantages over getenv().
+ */
+
+static INLINE int GETENV_S(char *buffer, size_t buffer_size, const char *name)
+{
+  char *env;
+
+  if (!buffer) {
+    if (buffer_size == 0)
+      return 0;
+    else
+      return (errno = EINVAL);
+  }
+  if (buffer_size == 0)
+    return (errno = EINVAL);
+  if (!name) {
+    *buffer = 0;
+    return 0;
+  }
+
+  env = getenv(name);
+  if (!env)
+  {
+    *buffer = 0;
+    return 0;
+  }
+
+  if (strlen(env) + 1 > buffer_size) {
+    *buffer = 0;
+    return ERANGE;
+  }
+
+  strncpy(buffer, env, buffer_size);
+
+  return 0;
+}
+
+#endif /* _MSC_VER */
+
+#endif /* NO_GETENV */
+
+
+#ifndef NO_PUTENV
+
+#ifdef _WIN32
+
+#define PUTENV_S(name, value)  _putenv_s(name, value)
+
+#else
+
+/* This provides a similar interface to the Microsoft _putenv_s() function, but
+ * other than parameter validation, it has no advantages over setenv().
+ */
+
+static INLINE int PUTENV_S(const char *name, const char *value)
+{
+  if (!name || !value)
+    return (errno = EINVAL);
+
+  setenv(name, value, 1);
+
+  return errno;
+}
+
+#endif /* _WIN32 */
+
+#endif /* NO_PUTENV */
+
+
+#endif /* JINCLUDE_H */
diff --git a/jmemmgr.c b/jmemmgr.c
index d053813d..8f5a4ab1 100644
--- a/jmemmgr.c
+++ b/jmemmgr.c
@@ -4,7 +4,7 @@
  * This file was part of the Independent JPEG Group's software:
  * Copyright (C) 1991-1997, Thomas G. Lane.
  * libjpeg-turbo Modifications:
- * Copyright (C) 2016, 2021, D. R. Commander.
+ * Copyright (C) 2016, 2021-2022, D. R. Commander.
  * For conditions of distribution and use, see the accompanying README.ijg
  * file.
  *
@@ -1156,12 +1156,16 @@ jinit_memory_mgr(j_common_ptr cinfo)
    */
 #ifndef NO_GETENV
   {
-    char *memenv;
+    char memenv[30] = { 0 };
 
-    if ((memenv = getenv("JPEGMEM")) != NULL) {
+    if (!GETENV_S(memenv, 30, "JPEGMEM") && strlen(memenv) > 0) {
       char ch = 'x';
 
+#ifdef _MSC_VER
+      if (sscanf_s(memenv, "%ld%c", &max_to_use, &ch, 1) > 0) {
+#else
       if (sscanf(memenv, "%ld%c", &max_to_use, &ch) > 0) {
+#endif
         if (ch == 'm' || ch == 'M')
           max_to_use *= 1000L;
         mem->pub.max_memory_to_use = max_to_use * 1000L;
diff --git a/jpegtran.c b/jpegtran.c
index 7dd27232..4c7ab772 100644
--- a/jpegtran.c
+++ b/jpegtran.c
@@ -4,7 +4,7 @@
  * This file was part of the Independent JPEG Group's software:
  * Copyright (C) 1995-2019, Thomas G. Lane, Guido Vollbeding.
  * libjpeg-turbo Modifications:
- * Copyright (C) 2010, 2014, 2017, 2019-2021, D. R. Commander.
+ * Copyright (C) 2010, 2014, 2017, 2019-2022, D. R. Commander.
  * For conditions of distribution and use, see the accompanying README.ijg
  * file.
  *
@@ -14,6 +14,10 @@
  * provides some lossless and sort-of-lossless transformations of JPEG data.
  */
 
+#ifdef _MSC_VER
+#define _CRT_SECURE_NO_DEPRECATE
+#endif
+
 #include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
 #include "transupp.h"           /* Support routines for jpegtran */
 #include "jversion.h"           /* for version message */
diff --git a/md5/md5hl.c b/md5/md5hl.c
index 8a4a762f..849a1366 100644
--- a/md5/md5hl.c
+++ b/md5/md5hl.c
@@ -6,7 +6,7 @@
  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
  * ----------------------------------------------------------------------------
  * libjpeg-turbo Modifications:
- * Copyright (C)2016, 2018-2019 D. R. Commander.  All Rights Reserved.
+ * Copyright (C)2016, 2018-2019, 2022 D. R. Commander.  All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -34,6 +34,10 @@
  * ----------------------------------------------------------------------------
  */
 
+#ifdef _MSC_VER
+#define _CRT_SECURE_NO_DEPRECATE
+#endif
+
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
diff --git a/rdjpgcom.c b/rdjpgcom.c
index fc0c08c0..9910a634 100644
--- a/rdjpgcom.c
+++ b/rdjpgcom.c
@@ -15,6 +15,10 @@
  * JPEG markers.
  */
 
+#ifdef _MSC_VER
+#define _CRT_SECURE_NO_DEPRECATE
+#endif
+
 #define JPEG_CJPEG_DJPEG        /* to get the command-line config symbols */
 #include "jinclude.h"           /* get auto-config symbols, <stdio.h> */
 
diff --git a/rdswitch.c b/rdswitch.c
index f9ed70f5..33449c86 100644
--- a/rdswitch.c
+++ b/rdswitch.c
@@ -17,6 +17,10 @@
  *      -sample HxV[,HxV,...]   Set component sampling factors
  */
 
+#ifdef _MSC_VER
+#define _CRT_SECURE_NO_DEPRECATE
+#endif
+
 #include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
 #include <ctype.h>              /* to declare isdigit(), isspace() */
 
diff --git a/simd/arm/aarch32/jsimd.c b/simd/arm/aarch32/jsimd.c
index fac55dfb..e3adf23d 100644
--- a/simd/arm/aarch32/jsimd.c
+++ b/simd/arm/aarch32/jsimd.c
@@ -3,7 +3,7 @@
  *
  * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
  * Copyright (C) 2011, Nokia Corporation and/or its subsidiary(-ies).
- * Copyright (C) 2009-2011, 2013-2014, 2016, 2018, D. R. Commander.
+ * Copyright (C) 2009-2011, 2013-2014, 2016, 2018, 2022, D. R. Commander.
  * Copyright (C) 2015-2016, 2018, Matthieu Darbois.
  * Copyright (C) 2019, Google LLC.
  * Copyright (C) 2020, Arm Limited.
@@ -105,7 +105,7 @@ LOCAL(void)
 init_simd(void)
 {
 #ifndef NO_GETENV
-  char *env = NULL;
+  char env[2] = { 0 };
 #endif
 #if !defined(__ARM_NEON__) && (defined(__linux__) || defined(ANDROID) || defined(__ANDROID__))
   int bufsize = 1024; /* an initial guess for the line buffer size limit */
@@ -131,14 +131,11 @@ init_simd(void)
 
 #ifndef NO_GETENV
   /* Force different settings through environment variables */
-  env = getenv("JSIMD_FORCENEON");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FORCENEON") && !strcmp(env, "1"))
     simd_support = JSIMD_NEON;
-  env = getenv("JSIMD_FORCENONE");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FORCENONE") && !strcmp(env, "1"))
     simd_support = 0;
-  env = getenv("JSIMD_NOHUFFENC");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_NOHUFFENC") && !strcmp(env, "1"))
     simd_huffman = 0;
 #endif
 }
diff --git a/simd/arm/aarch64/jsimd.c b/simd/arm/aarch64/jsimd.c
index 8570b82c..604d5472 100644
--- a/simd/arm/aarch64/jsimd.c
+++ b/simd/arm/aarch64/jsimd.c
@@ -3,7 +3,7 @@
  *
  * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
  * Copyright (C) 2011, Nokia Corporation and/or its subsidiary(-ies).
- * Copyright (C) 2009-2011, 2013-2014, 2016, 2018, 2020, D. R. Commander.
+ * Copyright (C) 2009-2011, 2013-2014, 2016, 2018, 2020, 2022, D. R. Commander.
  * Copyright (C) 2015-2016, 2018, Matthieu Darbois.
  * Copyright (C) 2020, Arm Limited.
  *
@@ -125,7 +125,7 @@ LOCAL(void)
 init_simd(void)
 {
 #ifndef NO_GETENV
-  char *env = NULL;
+  char env[2] = { 0 };
 #endif
 #if defined(__linux__) || defined(ANDROID) || defined(__ANDROID__)
   int bufsize = 1024; /* an initial guess for the line buffer size limit */
@@ -147,24 +147,19 @@ init_simd(void)
 
 #ifndef NO_GETENV
   /* Force different settings through environment variables */
-  env = getenv("JSIMD_FORCENEON");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FORCENEON") && !strcmp(env, "1"))
     simd_support = JSIMD_NEON;
-  env = getenv("JSIMD_FORCENONE");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FORCENONE") && !strcmp(env, "1"))
     simd_support = 0;
-  env = getenv("JSIMD_NOHUFFENC");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_NOHUFFENC") && !strcmp(env, "1"))
     simd_huffman = 0;
-  env = getenv("JSIMD_FASTLD3");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FASTLD3") && !strcmp(env, "1"))
     simd_features |= JSIMD_FASTLD3;
-  if ((env != NULL) && (strcmp(env, "0") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FASTLD3") && !strcmp(env, "0"))
     simd_features &= ~JSIMD_FASTLD3;
-  env = getenv("JSIMD_FASTST3");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FASTST3") && !strcmp(env, "1"))
     simd_features |= JSIMD_FASTST3;
-  if ((env != NULL) && (strcmp(env, "0") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FASTST3") && !strcmp(env, "0"))
     simd_features &= ~JSIMD_FASTST3;
 #endif
 }
diff --git a/simd/i386/jsimd.c b/simd/i386/jsimd.c
index 563949a0..80bc821f 100644
--- a/simd/i386/jsimd.c
+++ b/simd/i386/jsimd.c
@@ -2,7 +2,7 @@
  * jsimd_i386.c
  *
  * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
- * Copyright (C) 2009-2011, 2013-2014, 2016, 2018, D. R. Commander.
+ * Copyright (C) 2009-2011, 2013-2014, 2016, 2018, 2022, D. R. Commander.
  * Copyright (C) 2015-2016, 2018, Matthieu Darbois.
  *
  * Based on the x86 SIMD extension for IJG JPEG library,
@@ -44,7 +44,7 @@ LOCAL(void)
 init_simd(void)
 {
 #ifndef NO_GETENV
-  char *env = NULL;
+  char env[2] = { 0 };
 #endif
 
   if (simd_support != ~0U)
@@ -54,26 +54,19 @@ init_simd(void)
 
 #ifndef NO_GETENV
   /* Force different settings through environment variables */
-  env = getenv("JSIMD_FORCEMMX");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FORCEMMX") && !strcmp(env, "1"))
     simd_support &= JSIMD_MMX;
-  env = getenv("JSIMD_FORCE3DNOW");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FORCE3DNOW") && !strcmp(env, "1"))
     simd_support &= JSIMD_3DNOW | JSIMD_MMX;
-  env = getenv("JSIMD_FORCESSE");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FORCESSE") && !strcmp(env, "1"))
     simd_support &= JSIMD_SSE | JSIMD_MMX;
-  env = getenv("JSIMD_FORCESSE2");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FORCESSE2") && !strcmp(env, "1"))
     simd_support &= JSIMD_SSE2;
-  env = getenv("JSIMD_FORCEAVX2");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FORCEAVX2") && !strcmp(env, "1"))
     simd_support &= JSIMD_AVX2;
-  env = getenv("JSIMD_FORCENONE");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FORCENONE") && !strcmp(env, "1"))
     simd_support = 0;
-  env = getenv("JSIMD_NOHUFFENC");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_NOHUFFENC") && !strcmp(env, "1"))
     simd_huffman = 0;
 #endif
 }
diff --git a/simd/x86_64/jsimd.c b/simd/x86_64/jsimd.c
index eb766799..584a010a 100644
--- a/simd/x86_64/jsimd.c
+++ b/simd/x86_64/jsimd.c
@@ -2,7 +2,7 @@
  * jsimd_x86_64.c
  *
  * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
- * Copyright (C) 2009-2011, 2014, 2016, 2018, D. R. Commander.
+ * Copyright (C) 2009-2011, 2014, 2016, 2018, 2022, D. R. Commander.
  * Copyright (C) 2015-2016, 2018, Matthieu Darbois.
  *
  * Based on the x86 SIMD extension for IJG JPEG library,
@@ -44,7 +44,7 @@ LOCAL(void)
 init_simd(void)
 {
 #ifndef NO_GETENV
-  char *env = NULL;
+  char env[2] = { 0 };
 #endif
 
   if (simd_support != ~0U)
@@ -54,17 +54,13 @@ init_simd(void)
 
 #ifndef NO_GETENV
   /* Force different settings through environment variables */
-  env = getenv("JSIMD_FORCESSE2");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FORCESSE2") && !strcmp(env, "1"))
     simd_support &= JSIMD_SSE2;
-  env = getenv("JSIMD_FORCEAVX2");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FORCEAVX2") && !strcmp(env, "1"))
     simd_support &= JSIMD_AVX2;
-  env = getenv("JSIMD_FORCENONE");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_FORCENONE") && !strcmp(env, "1"))
     simd_support = 0;
-  env = getenv("JSIMD_NOHUFFENC");
-  if ((env != NULL) && (strcmp(env, "1") == 0))
+  if (!GETENV_S(env, 2, "JSIMD_NOHUFFENC") && !strcmp(env, "1"))
     simd_huffman = 0;
 #endif
 }
diff --git a/strtest.c b/strtest.c
new file mode 100644
index 00000000..ceaad91a
--- /dev/null
+++ b/strtest.c
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C)2022 D. R. Commander.  All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ * - Neither the name of the libjpeg-turbo Project nor the names of its
+ *   contributors may be used to endorse or promote products derived from this
+ *   software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "jinclude.h"
+
+
+#define CHECK_VALUE(actual, expected, desc) \
+  if (actual != expected) { \
+    printf("ERROR in line %d: " desc " is %d, should be %d\n", \
+           __LINE__, actual, expected); \
+    return -1; \
+  }
+
+#define CHECK_ERRNO(errno_return, expected_errno) \
+  CHECK_VALUE(errno_return, expected_errno, "Return value") \
+  CHECK_VALUE(errno, expected_errno, "errno") \
+
+
+#ifdef _MSC_VER
+
+void invalid_parameter_handler(const wchar_t *expression,
+                               const wchar_t *function, const wchar_t *file,
+                               unsigned int line, uintptr_t pReserved)
+{
+}
+
+#endif
+
+
+int main(int argc, char **argv)
+{
+  int err;
+  char env[3];
+
+#ifdef _MSC_VER
+  _set_invalid_parameter_handler(invalid_parameter_handler);
+#endif
+
+  /***************************************************************************/
+
+#ifndef NO_PUTENV
+
+  printf("PUTENV_S():\n");
+
+  errno = 0;
+  err = PUTENV_S(NULL, "12");
+  CHECK_ERRNO(err, EINVAL);
+
+  errno = 0;
+  err = PUTENV_S("TESTENV", NULL);
+  CHECK_ERRNO(err, EINVAL);
+
+  errno = 0;
+  err = PUTENV_S("TESTENV", "12");
+  CHECK_ERRNO(err, 0);
+
+  printf("SUCCESS!\n\n");
+
+#endif
+
+  /***************************************************************************/
+
+#ifndef NO_GETENV
+
+  printf("GETENV_S():\n");
+
+  errno = 0;
+  env[0] = 1;
+  env[1] = 2;
+  env[2] = 3;
+  err = GETENV_S(env, 3, NULL);
+  CHECK_ERRNO(err, 0);
+  CHECK_VALUE(env[0], 0, "env[0]");
+  CHECK_VALUE(env[1], 2, "env[1]");
+  CHECK_VALUE(env[2], 3, "env[2]");
+
+  errno = 0;
+  env[0] = 1;
+  env[1] = 2;
+  env[2] = 3;
+  err = GETENV_S(env, 3, "TESTENV2");
+  CHECK_ERRNO(err, 0);
+  CHECK_VALUE(env[0], 0, "env[0]");
+  CHECK_VALUE(env[1], 2, "env[1]");
+  CHECK_VALUE(env[2], 3, "env[2]");
+
+  errno = 0;
+  err = GETENV_S(NULL, 3, "TESTENV");
+  CHECK_ERRNO(err, EINVAL);
+
+  errno = 0;
+  err = GETENV_S(NULL, 0, "TESTENV");
+  CHECK_ERRNO(err, 0);
+
+  errno = 0;
+  env[0] = 1;
+  err = GETENV_S(env, 0, "TESTENV");
+  CHECK_ERRNO(err, EINVAL);
+  CHECK_VALUE(env[0], 1, "env[0]");
+
+  errno = 0;
+  env[0] = 1;
+  env[1] = 2;
+  env[2] = 3;
+  err = GETENV_S(env, 1, "TESTENV");
+  CHECK_VALUE(err, ERANGE, "Return value");
+  CHECK_VALUE(errno, 0, "errno");
+  CHECK_VALUE(env[0], 0, "env[0]");
+  CHECK_VALUE(env[1], 2, "env[1]");
+  CHECK_VALUE(env[2], 3, "env[2]");
+
+  errno = 0;
+  env[0] = 1;
+  env[1] = 2;
+  env[2] = 3;
+  err = GETENV_S(env, 2, "TESTENV");
+  CHECK_VALUE(err, ERANGE, "Return value");
+  CHECK_VALUE(errno, 0, "errno");
+  CHECK_VALUE(env[0], 0, "env[0]");
+  CHECK_VALUE(env[1], 2, "env[1]");
+  CHECK_VALUE(env[2], 3, "env[2]");
+
+  errno = 0;
+  env[0] = 1;
+  env[1] = 2;
+  env[2] = 3;
+  err = GETENV_S(env, 3, "TESTENV");
+  CHECK_ERRNO(err, 0);
+  CHECK_VALUE(env[0], '1', "env[0]");
+  CHECK_VALUE(env[1], '2', "env[1]");
+  CHECK_VALUE(env[2], 0, "env[2]");
+
+  printf("SUCCESS!\n\n");
+
+#endif
+
+  /***************************************************************************/
+
+  return 0;
+}
diff --git a/tjbench.c b/tjbench.c
index 344cb4cb..b7878b61 100644
--- a/tjbench.c
+++ b/tjbench.c
@@ -26,6 +26,10 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifdef _MSC_VER
+#define _CRT_SECURE_NO_DEPRECATE
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/tjexample.c b/tjexample.c
index a9cd865b..505c9dd4 100644
--- a/tjexample.c
+++ b/tjexample.c
@@ -1,6 +1,6 @@
 /*
- * Copyright (C)2011-2012, 2014-2015, 2017, 2019, 2021 D. R. Commander.
- *                                                     All Rights Reserved.
+ * Copyright (C)2011-2012, 2014-2015, 2017, 2019, 2021-2022
+ *           D. R. Commander.  All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -32,6 +32,10 @@
  * images using the TurboJPEG C API
  */
 
+#ifdef _MSC_VER
+#define _CRT_SECURE_NO_DEPRECATE
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/tjunittest.c b/tjunittest.c
index f59939fd..bda65f95 100644
--- a/tjunittest.c
+++ b/tjunittest.c
@@ -1,5 +1,6 @@
 /*
- * Copyright (C)2009-2014, 2017-2019 D. R. Commander.  All Rights Reserved.
+ * Copyright (C)2009-2014, 2017-2019, 2022 D. R. Commander.
+ *                                         All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -30,6 +31,10 @@
  * This program tests the various code paths in the TurboJPEG C Wrapper
  */
 
+#ifdef _MSC_VER
+#define _CRT_SECURE_NO_DEPRECATE
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/tjutil.h b/tjutil.h
index 8542bab9..fc8a17a7 100644
--- a/tjutil.h
+++ b/tjutil.h
@@ -27,11 +27,6 @@
  */
 
 #ifdef _WIN32
-#ifndef __MINGW32__
-#include <stdio.h>
-#define snprintf(str, n, format, ...) \
-  _snprintf_s(str, n, _TRUNCATE, format, ##__VA_ARGS__)
-#endif
 #define strcasecmp  stricmp
 #define strncasecmp  strnicmp
 #endif
diff --git a/turbojpeg-jni.c b/turbojpeg-jni.c
index 4fa6dfdf..dc80e23c 100644
--- a/turbojpeg-jni.c
+++ b/turbojpeg-jni.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C)2011-2021 D. R. Commander.  All Rights Reserved.
+ * Copyright (C)2011-2022 D. R. Commander.  All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -29,9 +29,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include "turbojpeg.h"
-#ifdef WIN32
-#include "tjutil.h"
-#endif
+#include "jinclude.h"
 #include <jni.h>
 #include "java/org_libjpegturbo_turbojpeg_TJCompressor.h"
 #include "java/org_libjpegturbo_turbojpeg_TJDecompressor.h"
@@ -88,10 +86,7 @@
   BAILIF0(_fid = (*env)->GetFieldID(env, _cls, "handle", "J")); \
   handle = (tjhandle)(size_t)(*env)->GetLongField(env, obj, _fid);
 
-#ifdef _WIN32
-#define setenv(envvar, value, dummy)  _putenv_s(envvar, value)
-#endif
-
+#ifndef NO_PUTENV
 #define PROP2ENV(property, envvar) { \
   if ((jName = (*env)->NewStringUTF(env, property)) != NULL) { \
     jboolean exception; \
@@ -99,11 +94,12 @@
     exception = (*env)->ExceptionCheck(env); \
     if (jValue && !exception && \
         (value = (*env)->GetStringUTFChars(env, jValue, 0)) != NULL) { \
-      setenv(envvar, value, 1); \
+      PUTENV_S(envvar, value); \
       (*env)->ReleaseStringUTFChars(env, jValue, value); \
     } \
   } \
 }
+#endif
 
 #define SAFE_RELEASE(javaArray, cArray) { \
   if (javaArray && cArray) \
@@ -122,10 +118,12 @@ static int ProcessSystemProperties(JNIEnv *env)
   BAILIF0(mid = (*env)->GetStaticMethodID(env, cls, "getProperty",
     "(Ljava/lang/String;)Ljava/lang/String;"));
 
+#ifndef NO_PUTENV
   PROP2ENV("turbojpeg.optimize", "TJ_OPTIMIZE");
   PROP2ENV("turbojpeg.arithmetic", "TJ_ARITHMETIC");
   PROP2ENV("turbojpeg.restart", "TJ_RESTART");
   PROP2ENV("turbojpeg.progressive", "TJ_PROGRESSIVE");
+#endif
   return 0;
 
 bailout:
diff --git a/turbojpeg.c b/turbojpeg.c
index d780dc25..71cbc46b 100644
--- a/turbojpeg.c
+++ b/turbojpeg.c
@@ -196,10 +196,19 @@ static int cs2pf[JPEG_NUMCS] = {
   snprintf(errStr, JMSG_LENGTH_MAX, "%s", m); \
   retval = -1;  goto bailout; \
 }
+#ifdef _MSC_VER
+#define THROW_UNIX(m) { \
+  char strerrorBuf[80] = { 0 }; \
+  strerror_s(strerrorBuf, 80, errno); \
+  snprintf(errStr, JMSG_LENGTH_MAX, "%s\n%s", m, strerrorBuf); \
+  retval = -1;  goto bailout; \
+}
+#else
 #define THROW_UNIX(m) { \
   snprintf(errStr, JMSG_LENGTH_MAX, "%s\n%s", m, strerror(errno)); \
   retval = -1;  goto bailout; \
 }
+#endif
 #define THROW(m) { \
   snprintf(this->errStr, JMSG_LENGTH_MAX, "%s", m); \
   this->isInstanceError = TRUE;  THROWG(m) \
@@ -271,7 +280,7 @@ static void setCompDefaults(struct jpeg_compress_struct *cinfo,
                             int flags)
 {
 #ifndef NO_GETENV
-  char *env = NULL;
+  char env[7] = { 0 };
 #endif
 
   cinfo->in_color_space = pf2cs[pixelFormat];
@@ -279,18 +288,21 @@ static void setCompDefaults(struct jpeg_compress_struct *cinfo,
   jpeg_set_defaults(cinfo);
 
 #ifndef NO_GETENV
-  if ((env = getenv("TJ_OPTIMIZE")) != NULL && strlen(env) > 0 &&
-      !strcmp(env, "1"))
+  if (!GETENV_S(env, 7, "TJ_OPTIMIZE") && !strcmp(env, "1"))
     cinfo->optimize_coding = TRUE;
-  if ((env = getenv("TJ_ARITHMETIC")) != NULL && strlen(env) > 0 &&
-      !strcmp(env, "1"))
+  if (!GETENV_S(env, 7, "TJ_ARITHMETIC") && !strcmp(env, "1"))
     cinfo->arith_code = TRUE;
-  if ((env = getenv("TJ_RESTART")) != NULL && strlen(env) > 0) {
+  if (!GETENV_S(env, 7, "TJ_RESTART") && strlen(env) > 0) {
     int temp = -1;
     char tempc = 0;
 
+#ifdef _MSC_VER
+    if (sscanf_s(env, "%d%c", &temp, &tempc, 1) >= 1 && temp >= 0 &&
+        temp <= 65535) {
+#else
     if (sscanf(env, "%d%c", &temp, &tempc) >= 1 && temp >= 0 &&
         temp <= 65535) {
+#endif
       if (toupper(tempc) == 'B') {
         cinfo->restart_interval = temp;
         cinfo->restart_in_rows = 0;
@@ -317,8 +329,7 @@ static void setCompDefaults(struct jpeg_compress_struct *cinfo,
   if (flags & TJFLAG_PROGRESSIVE)
     jpeg_simple_progression(cinfo);
 #ifndef NO_GETENV
-  else if ((env = getenv("TJ_PROGRESSIVE")) != NULL && strlen(env) > 0 &&
-           !strcmp(env, "1"))
+  else if (!GETENV_S(env, 7, "TJ_PROGRESSIVE") && !strcmp(env, "1"))
     jpeg_simple_progression(cinfo);
 #endif
 
@@ -697,9 +708,9 @@ DLLEXPORT int tjCompress2(tjhandle handle, const unsigned char *srcBuf,
   cinfo->image_height = height;
 
 #ifndef NO_PUTENV
-  if (flags & TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1");
-  else if (flags & TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1");
-  else if (flags & TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1");
+  if (flags & TJFLAG_FORCEMMX) PUTENV_S("JSIMD_FORCEMMX", "1");
+  else if (flags & TJFLAG_FORCESSE) PUTENV_S("JSIMD_FORCESSE", "1");
+  else if (flags & TJFLAG_FORCESSE2) PUTENV_S("JSIMD_FORCESSE2", "1");
 #endif
 
   if (flags & TJFLAG_NOREALLOC) {
@@ -799,9 +810,9 @@ DLLEXPORT int tjEncodeYUVPlanes(tjhandle handle, const unsigned char *srcBuf,
   cinfo->image_height = height;
 
 #ifndef NO_PUTENV
-  if (flags & TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1");
-  else if (flags & TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1");
-  else if (flags & TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1");
+  if (flags & TJFLAG_FORCEMMX) PUTENV_S("JSIMD_FORCEMMX", "1");
+  else if (flags & TJFLAG_FORCESSE) PUTENV_S("JSIMD_FORCESSE", "1");
+  else if (flags & TJFLAG_FORCESSE2) PUTENV_S("JSIMD_FORCESSE2", "1");
 #endif
 
   setCompDefaults(cinfo, pixelFormat, subsamp, -1, flags);
@@ -1009,9 +1020,9 @@ DLLEXPORT int tjCompressFromYUVPlanes(tjhandle handle,
   cinfo->image_height = height;
 
 #ifndef NO_PUTENV
-  if (flags & TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1");
-  else if (flags & TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1");
-  else if (flags & TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1");
+  if (flags & TJFLAG_FORCEMMX) PUTENV_S("JSIMD_FORCEMMX", "1");
+  else if (flags & TJFLAG_FORCESSE) PUTENV_S("JSIMD_FORCESSE", "1");
+  else if (flags & TJFLAG_FORCESSE2) PUTENV_S("JSIMD_FORCESSE2", "1");
 #endif
 
   if (flags & TJFLAG_NOREALLOC) {
@@ -1295,9 +1306,9 @@ DLLEXPORT int tjDecompress2(tjhandle handle, const unsigned char *jpegBuf,
     THROW("tjDecompress2(): Invalid argument");
 
 #ifndef NO_PUTENV
-  if (flags & TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1");
-  else if (flags & TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1");
-  else if (flags & TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1");
+  if (flags & TJFLAG_FORCEMMX) PUTENV_S("JSIMD_FORCEMMX", "1");
+  else if (flags & TJFLAG_FORCESSE) PUTENV_S("JSIMD_FORCESSE", "1");
+  else if (flags & TJFLAG_FORCESSE2) PUTENV_S("JSIMD_FORCESSE2", "1");
 #endif
 
   if (flags & TJFLAG_LIMITSCANS) {
@@ -1471,9 +1482,9 @@ DLLEXPORT int tjDecodeYUVPlanes(tjhandle handle,
   dinfo->image_height = height;
 
 #ifndef NO_PUTENV
-  if (flags & TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1");
-  else if (flags & TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1");
-  else if (flags & TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1");
+  if (flags & TJFLAG_FORCEMMX) PUTENV_S("JSIMD_FORCEMMX", "1");
+  else if (flags & TJFLAG_FORCESSE) PUTENV_S("JSIMD_FORCESSE", "1");
+  else if (flags & TJFLAG_FORCESSE2) PUTENV_S("JSIMD_FORCESSE2", "1");
 #endif
 
   dinfo->progressive_mode = dinfo->inputctl->has_multiple_scans = FALSE;
@@ -1643,9 +1654,9 @@ DLLEXPORT int tjDecompressToYUVPlanes(tjhandle handle,
     THROW("tjDecompressToYUVPlanes(): Invalid argument");
 
 #ifndef NO_PUTENV
-  if (flags & TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1");
-  else if (flags & TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1");
-  else if (flags & TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1");
+  if (flags & TJFLAG_FORCEMMX) PUTENV_S("JSIMD_FORCEMMX", "1");
+  else if (flags & TJFLAG_FORCESSE) PUTENV_S("JSIMD_FORCESSE", "1");
+  else if (flags & TJFLAG_FORCESSE2) PUTENV_S("JSIMD_FORCESSE2", "1");
 #endif
 
   if (flags & TJFLAG_LIMITSCANS) {
@@ -1906,9 +1917,9 @@ DLLEXPORT int tjTransform(tjhandle handle, const unsigned char *jpegBuf,
     THROW("tjTransform(): Invalid argument");
 
 #ifndef NO_PUTENV
-  if (flags & TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1");
-  else if (flags & TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1");
-  else if (flags & TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1");
+  if (flags & TJFLAG_FORCEMMX) PUTENV_S("JSIMD_FORCEMMX", "1");
+  else if (flags & TJFLAG_FORCESSE) PUTENV_S("JSIMD_FORCESSE", "1");
+  else if (flags & TJFLAG_FORCESSE2) PUTENV_S("JSIMD_FORCESSE2", "1");
 #endif
 
   if (flags & TJFLAG_LIMITSCANS) {
@@ -2075,7 +2086,11 @@ DLLEXPORT unsigned char *tjLoadImage(const char *filename, int *width,
   this = (tjinstance *)handle;
   cinfo = &this->cinfo;
 
+#ifdef _MSC_VER
+  if (fopen_s(&file, filename, "rb") || file == NULL)
+#else
   if ((file = fopen(filename, "rb")) == NULL)
+#endif
     THROW_UNIX("tjLoadImage(): Cannot open input file");
 
   if ((tempc = getc(file)) < 0 || ungetc(tempc, file) == EOF)
@@ -2171,7 +2186,11 @@ DLLEXPORT int tjSaveImage(const char *filename, unsigned char *buffer,
   this = (tjinstance *)handle;
   dinfo = &this->dinfo;
 
+#ifdef _MSC_VER
+  if (fopen_s(&file, filename, "wb") || file == NULL)
+#else
   if ((file = fopen(filename, "wb")) == NULL)
+#endif
     THROW_UNIX("tjSaveImage(): Cannot open output file");
 
   if (setjmp(this->jerr.setjmp_buffer)) {
diff --git a/wrjpgcom.c b/wrjpgcom.c
index 6a4dc6bc..3ee08a0e 100644
--- a/wrjpgcom.c
+++ b/wrjpgcom.c
@@ -4,7 +4,7 @@
  * This file was part of the Independent JPEG Group's software:
  * Copyright (C) 1994-1997, Thomas G. Lane.
  * libjpeg-turbo Modifications:
- * Copyright (C) 2014, D. R. Commander.
+ * Copyright (C) 2014, 2022, D. R. Commander.
  * For conditions of distribution and use, see the accompanying README.ijg
  * file.
  *
@@ -14,6 +14,10 @@
  * JPEG markers.
  */
 
+#ifdef _MSC_VER
+#define _CRT_SECURE_NO_DEPRECATE
+#endif
+
 #define JPEG_CJPEG_DJPEG        /* to get the command-line config symbols */
 #include "jinclude.h"           /* get auto-config symbols, <stdio.h> */