Add nmake build support for manually configuring the 'port' files to be

built based on MSVC features.
Include tif_config.h in tools/tiffset.c.

libtiff/tif_config.vc.h

@@ -104,11 +104,22 @@
 /* Set the native cpu bit order */
 #define HOST_FILLORDER FILLORDER_LSB2MSB
 
+/*
+  Please see associated settings in "nmake.opt" which configure porting
+  settings. It should not be necessary to edit the following pre-processor
+  logic.
+*/
+#if defined(_MSC_VER)
 /* Visual Studio 2015 / VC 14 / MSVC 19.00 finally has snprintf() */
-#if defined(_MSC_VER) && _MSC_VER < 1900
-#define snprintf _snprintf
-#else
-#define HAVE_SNPRINTF 1
+#  if _MSC_VER < 1900 /* Visual C++ 2015 */
+#    define snprintf _snprintf
+#  else
+#    define HAVE_SNPRINTF 1
+#  endif
+#  if _MSC_VER >= 1920 /* Visual Studio 2019 has strtoll/strtoull */
+#    define HAVE_STRTOLL 1
+#    define HAVE_STRTOULL 1
+#  endif
 #endif
 
 /* Define to 1 if your processor stores words with the most significant byte

nmake.opt

@@ -29,6 +29,7 @@
 # Usage examples (see details below):
 # nmake -f makefile.vc
 # nmake -f makefile.vc DEBUG=1
+# nmake -f makefile.vc clean
 #
 #
 ###### Edit the following lines to choose a feature set you need. #######
@@ -108,6 +109,15 @@ CHECK_JPEG_YCBCR_SUBSAMPLING = 1
 ####################### Compiler related options. #######################
 #
 
+# If your MSVC does not provide strtol() and strtoul(), then these
+# should be set to 0.
+HAVE_STRTOL = 1
+HAVE_STRTOUL = 1
+
+# Users of MSVC 19.20 ("Visual Studio 2019") and later should set these to 1
+HAVE_STRTOLL = 0
+HAVE_STRTOULL = 0
+
 #
 # Pick debug or optimized build flags.  We default to an optimized build
 # with no debugging information.
@@ -118,7 +128,7 @@ OPTFLAGS =	/MDd /EHsc /W3 /D_CRT_SECURE_NO_DEPRECATE
 !ELSE
 OPTFLAGS =	/Ox /MD /EHsc /W3 /D_CRT_SECURE_NO_DEPRECATE
 !ENDIF
-#OPTFLAGS = 	/Zi 
+#OPTFLAGS = 	/Zi
 
 #
 # Uncomment following line to enable using Windows Common RunTime Library

port/Makefile.vc

@@ -23,13 +23,45 @@
 # Makefile for MS Visual C and Watcom C compilers.
 #
 # To build:
-# C:\libtiff\port> nmake /f makefile.vc 
+# C:\libtiff\port> nmake /f makefile.vc
 
 !INCLUDE ..\nmake.opt
 
+!IF $(HAVE_STRTOL)
+STRTOL_OBJ =
+EXTRAFLAGS	= -DHAVE_STRTOL $(EXTRAFLAGS)
+!ELSE
+STRTOL_OBJ = strtol.obj
+!ENDIF
+
+!IF $(HAVE_STRTOUL)
+STRTOUL_OBJ =
+EXTRAFLAGS	= -DHAVE_STRTOUL $(EXTRAFLAGS)
+!ELSE
+STRTOUL_OBJ = strtoul.obj
+!ENDIF
+
+!IF $(HAVE_STRTOLL)
+STRTOLL_OBJ =
+EXTRAFLAGS	= -DHAVE_STRTOLL $(EXTRAFLAGS)
+!ELSE
+STRTOLL_OBJ = strtoll.obj
+!ENDIF
+
+!IF $(HAVE_STRTOULL)
+STRTOULL_OBJ =
+EXTRAFLAGS	= -DHAVE_STRTOULL $(EXTRAFLAGS)
+!ELSE
+STRTOULL_OBJ = strtoull.obj
+!ENDIF
+
 OBJ	= \
-        snprintf.obj \
+	snprintf.obj \
 	strcasecmp.obj \
+	$(STRTOL_OBJ) \
+	$(STRTOUL_OBJ) \
+	$(STRTOLL_OBJ) \
+	$(STRTOULL_OBJ) \
 	getopt.obj
 
 all:	libport.lib

port/libport.h

@@ -36,16 +36,16 @@ int strcasecmp(const char *s1, const char *s2);
 #  define HAVE_GETOPT 1
 #endif
 
-#if HAVE_STRTOL
+#if defined(HAVE_STRTOL)
 long strtol(const char *nptr, char **endptr, int base);
 #endif
-#if HAVE_STRTOLL
+#if defined(HAVE_STRTOLL)
 long long strtoll(const char *nptr, char **endptr, int base);
 #endif
-#if HAVE_STRTOUL
+#if defined(HAVE_STRTOUL)
 unsigned long strtoul(const char *nptr, char **endptr, int base);
 #endif
-#if HAVE_STRTOULL
+#if defined(HAVE_STRTOULL)
 unsigned long long strtoull(const char *nptr, char **endptr, int base);
 #endif
 

tools/tiffset.c

@@ -35,6 +35,10 @@
 
 #include "tiffio.h"
 
+#ifdef NEED_LIBPORT
+# include "libport.h"
+#endif
+
 static char* usageMsg[] = {
 "usage: tiffset [options] filename",
 "where options are:",