Apply some of Daniel Richard G's Windows patches.

ChangeLog

@@ -41,6 +41,15 @@ architectures, alignment requirements take care of this automatically.
 9. When returning an error from pcre2_pattern_convert(), ensure the error
 offset is set zero for early errors.
 
+10. A number of patches for Windows support from Daniel Richard G:
+
+  (a) List of error numbers in Runtest.bat corrected (it was not the same as in 
+      Runtest). 
+      
+  (b) pcre2grep snprintf() workaround as used elsewhere in the tree.
+  
+  (c) Support for non-C99 snprintf() that returns -1 in the overflow case.  
+
 
 Version 10.31 12-February-2018
 ------------------------------

NON-AUTOTOOLS-BUILD

@@ -10,6 +10,7 @@ This document contains the following sections:
   Calling conventions in Windows environments
   Comments about Win32 builds
   Building PCRE2 on Windows with CMake
+  Building PCRE2 on Windows with Visual Studio
   Testing with RunTest.bat
   Building PCRE2 on native z/OS and z/VM
 
@@ -328,6 +329,18 @@ cache can be deleted by selecting "File > Delete Cache".
     most recent build configuration is targeted by the tests. A summary of
     test results is presented. Complete test output is subsequently
     available for review in Testing\Temporary under your build dir.
+    
+
+BUILDING PCRE2 ON WINDOWS WITH VISUAL STUDIO
+
+The code currently cannot be compiled without a stdint.h header, which is
+available only in relatively recent versions of Visual Studio. However, this
+portable and permissively-licensed implementation of the header worked without
+issue:
+
+  http://www.azillionmonkeys.com/qed/pstdint.h
+
+Just rename it and drop it into the top level of the build tree.
 
 
 TESTING WITH RUNTEST.BAT
@@ -382,6 +395,6 @@ Everything in that location, source and executable, is in EBCDIC and native
 z/OS file formats. The port provides an API for LE languages such as COBOL and
 for the z/OS and z/VM versions of the Rexx languages.
 
-===============================
-Last Updated: 13 September 2017
-===============================
+===========================
+Last Updated: 19 April 2018
+===========================

RunTest.bat

@@ -263,7 +263,7 @@ if errorlevel 1 (
   set failed="yes"
   goto :eof
 ) else if [%1]==[2] (
-  %pcre2test% %mode% %4 %5 %6 %7 %8 %9 -error -63,-62,-2,-1,0,100,188,189,190,191 >>%2%bits%\%testoutput%
+  %pcre2test% %mode% %4 %5 %6 %7 %8 %9 -error -65,-62,-2,-1,0,100,101,191,200 >>%2%bits%\%testoutput%
 )
 
 set type=

src/pcre2grep.c

@@ -96,6 +96,14 @@ POSSIBILITY OF SUCH DAMAGE.
 #define PCRE2_CODE_UNIT_WIDTH 8
 #include "pcre2.h"
 
+/* Older versions of MSVC lack snprintf(). This define allows for
+warning/error-free compilation and testing with MSVC compilers back to at least
+MSVC 10/2010. Except for VC6 (which is missing some fundamentals and fails). */
+
+#if defined(_MSC_VER) && (_MSC_VER < 1900)
+#define snprintf _snprintf
+#endif
+
 #define FALSE 0
 #define TRUE 1
 
@@ -3663,16 +3671,18 @@ for (i = 1; i < argc; i++)
         {
         char buff1[24];
         char buff2[24];
+        int ret;
 
         int baselen = (int)(opbra - op->long_name);
         int fulllen = (int)(strchr(op->long_name, ')') - op->long_name + 1);
         int arglen = (argequals == NULL || equals == NULL)?
           (int)strlen(arg) : (int)(argequals - arg);
 
-        if (snprintf(buff1, sizeof(buff1), "%.*s", baselen, op->long_name) >
-              (int)sizeof(buff1) ||
-            snprintf(buff2, sizeof(buff2), "%s%.*s", buff1,
-              fulllen - baselen - 2, opbra + 1) > (int)sizeof(buff2))
+        if ((ret = snprintf(buff1, sizeof(buff1), "%.*s", baselen, op->long_name),
+             ret < 0 || ret > (int)sizeof(buff1)) ||
+            (ret = snprintf(buff2, sizeof(buff2), "%s%.*s", buff1,
+                     fulllen - baselen - 2, opbra + 1),
+             ret < 0 || ret > (int)sizeof(buff2)))
           {
           fprintf(stderr, "pcre2grep: Buffer overflow when parsing %s option\n",
             op->long_name);