Make (*LIMIT_MATCH=) give an error and correct offsets for limit syntax errors.

ChangeLog

@@ -128,6 +128,11 @@ offsets in the pattern.
 
 33. Improve the performance of starting single character repetitions in JIT.
 
+34. (*LIMIT_MATCH=) now gives an error instead of setting the value to 0.
+
+35. Error messages for syntax errors in *LIMIT_MATCH and *LIMIT_RECURSION now
+give the right offset instead of zero.
+
 
 Version 10.20 30-June-2015
 --------------------------

src/pcre2_compile.c

@@ -7941,6 +7941,12 @@ while (ptr[skipatstart] == CHAR_LEFT_PARENTHESIS &&
         case PSO_LIMR:
         c = 0;
         pp = skipatstart;
+        if (!IS_DIGIT(ptr[pp]))
+          {
+          errorcode = ERR60;
+          ptr += pp; 
+          goto HAD_ERROR;
+          }    
         while (IS_DIGIT(ptr[pp]))
           {
           if (c > UINT32_MAX / 10 - 1) break;   /* Integer overflow */
@@ -7949,6 +7955,7 @@ while (ptr[skipatstart] == CHAR_LEFT_PARENTHESIS &&
         if (ptr[pp++] != CHAR_RIGHT_PARENTHESIS)
           {
           errorcode = ERR60;
+          ptr += pp; 
           goto HAD_ERROR;
           }
         if (p->type == PSO_LIMM) limit_match = c;

testdata/testinput2

@@ -4399,4 +4399,8 @@ a random value. /Ix
 
 /(?(1)()\983040\2)/
 
+/(*LIMIT_MATCH=)abc/
+
+/(*CRLF)(*LIMIT_MATCH=)abc/
+
 # End of testinput2 

testdata/testoutput14

@@ -98,10 +98,10 @@ Minimum recursion limit = 10
  3: ee
 
 /(*LIMIT_MATCH=12bc)abc/
-Failed: error 160 at offset 0: (*VERB) not recognized or malformed
+Failed: error 160 at offset 17: (*VERB) not recognized or malformed
 
 /(*LIMIT_MATCH=4294967290)abc/
-Failed: error 160 at offset 0: (*VERB) not recognized or malformed
+Failed: error 160 at offset 24: (*VERB) not recognized or malformed
 
 /(*LIMIT_RECURSION=4294967280)abc/I
 Capturing subpattern count = 0

testdata/testoutput2

@@ -14651,4 +14651,10 @@ No match
 /(?(1)()\983040\2)/
 Failed: error 115 at offset 13: reference to non-existent subpattern
 
+/(*LIMIT_MATCH=)abc/
+Failed: error 160 at offset 14: (*VERB) not recognized or malformed
+
+/(*CRLF)(*LIMIT_MATCH=)abc/
+Failed: error 160 at offset 21: (*VERB) not recognized or malformed
+
 # End of testinput2