grok_atoUV: allow non-C strings and document

This changes the internal function grok_atoUV() to not require its input
to be NUL-terminated.  That means the existing calls to it must be
changed to set the ending position before calling it, as some did
already.

This function is recommended to use in a couple of pods, but it wasn't
documented in perlintern.  This commit does that as well.

1 files changed, 1 insertions, 1 deletions

diff --git a/mg.c b/mg.c
index c03bf257ff..b022d63442 100644
--- a/mg.c
+++ b/mg.c
@@ -3170,7 +3170,7 @@ Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
 	{
 	    const char *p = SvPV_const(sv, len);
             Groups_t *gary = NULL;
-            const char* endptr;
+            const char* endptr = p + len;
             UV uv;
 #ifdef _SC_NGROUPS_MAX
            int maxgrp = sysconf(_SC_NGROUPS_MAX);