Fix global overflow bug for get/copy names in pcre2test.

ChangeLog

@@ -157,6 +157,9 @@ obsolete these days and in any case had become very haphazard.
 
 22. Add the use_length modifier to pcre2test.
 
+23. Fix an off-by-one bug in pcre2test for the list of names for 'get' and 
+'copy' modifiers.
+
 
 Version 10.22 29-July-2016
 --------------------------

src/pcre2test.c

@@ -3556,10 +3556,16 @@ for (;;)
       char *nn = (char *)field;
       if (len > 0)                    /* Add new name */
         {
-        while (*nn != 0) nn += strlen(nn) + 1;
+        if (len > MAX_NAME_SIZE)
-        if (nn + len + 1 - (char *)field > LENCPYGET)
           {
-          fprintf(outfile, "** Too many named '%s' modifiers\n", m->name);
+          fprintf(outfile, "** Group name in '%s' is too long\n", m->name);
+          return FALSE;  
+          }   
+        while (*nn != 0) nn += strlen(nn) + 1;
+        if (nn + len + 2 - (char *)field > LENCPYGET)
+          {
+          fprintf(outfile, "** Too many characters in named '%s' modifiers\n", 
+            m->name);
           return FALSE;
           }
         memcpy(nn, pp, len);

testdata/testinput2

@@ -4908,4 +4908,8 @@ a)"xI
 
 /{„Í„ÍÍ„Í{'{22{2{{2{'{22{{22{2{'{22{2{{2{{222{{2{'{22{2{22{2{'{22{2{{2{'{22{2{22{2{'{'{22{2{22{2{'{22{2{{2{'{22{2{22{2{'{222{2Ä„Í„ÍÍ„Í{'{22{2{{2{'{22{{11{2{'{22{2{{2{{'{22{2{{2{'{22{{22{1{'{22{2{{2{{222{{2{'{22{2{22{2{'{/auto_callout
 
+//
+\=get=i00000000000000000000000000000000
+\=get=i2345678901234567890123456789012,get=i1245678901234567890123456789012
+
 # End of testinput2 

testdata/testoutput2

@@ -15355,6 +15355,12 @@ Failed: error 157 at offset 6: \g is not followed by a braced, angle-bracketed,
 
 /{„Í„ÍÍ„Í{'{22{2{{2{'{22{{22{2{'{22{2{{2{{222{{2{'{22{2{22{2{'{22{2{{2{'{22{2{22{2{'{'{22{2{22{2{'{22{2{{2{'{22{2{22{2{'{222{2Ä„Í„ÍÍ„Í{'{22{2{{2{'{22{{11{2{'{22{2{{2{{'{22{2{{2{'{22{{22{1{'{22{2{{2{{222{{2{'{22{2{22{2{'{/auto_callout
 
+//
+\=get=i00000000000000000000000000000000
+** Group name in 'get' is too long
+\=get=i2345678901234567890123456789012,get=i1245678901234567890123456789012
+** Too many characters in named 'get' modifiers
+
 # End of testinput2 
 Error -63: PCRE2_ERROR_BADDATA (unknown error number)
 Error -62: bad serialized data