Use SSize_t/STRLEN in more places in regexp code

As part of getting the regexp engine to handle long strings, this com-
mit changes any variables, parameters and struct members that hold
lengths of the string being matched against (or parts thereof) to use
SSize_t or STRLEN instead of [IU]32.

To avoid having to change any logic, I kept the signedness the same.

I did not change anything that affects the length of the regular
expression itself, so regexps are still practically limited to
I32_MAX.  Changing that would involve changing the size of regnodes,
which would be a lot more involved.

These changes should fix bugs, but are very hard to test.  In most
cases, I don’t know the regexp engine well enough to come up with test
cases that test the paths in question with long strings.  In other
cases I don’t have a box with enough memory to test the fix.

1 files changed, 2 insertions, 2 deletions

diff --git a/pod/perlreapi.pod b/pod/perlreapi.pod
index 659088e941..cfc41d7626 100644
--- a/pod/perlreapi.pod
+++ b/pod/perlreapi.pod
@@ -17,7 +17,7 @@ following format:
                          REGEXP * const rx,
                          char* stringarg,
                          char* strend, char* strbeg,
-                         I32 minend, SV* sv,
+                         SSize_t minend, SV* sv,
                          void* data, U32 flags);
         char*   (*intuit) (pTHX_
                            REGEXP * const rx, SV *sv,
@@ -238,7 +238,7 @@ certain optimisations when this is set.
 
     I32 exec(pTHX_ REGEXP * const rx,
              char *stringarg, char* strend, char* strbeg,
-             I32 minend, SV* sv,
+             SSize_t minend, SV* sv,
              void* data, U32 flags);
 
 Execute a regexp. The arguments are