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, 2 insertions, 1 deletions

diff --git a/perl.c b/perl.c
index e6dfa8dc05..86376e30da 100644
--- a/perl.c
+++ b/perl.c
@@ -3351,7 +3351,7 @@ Perl_get_debug_opts(pTHX_ const char **s, bool givehelp)
 	}
     }
     else if (isDIGIT(**s)) {
-        const char* e;
+        const char* e = *s + strlen(*s);
 	if (grok_atoUV(*s, &uv, &e))
             *s = e;
 	for (; isWORDCHAR(**s); (*s)++) ;
@@ -3946,6 +3946,7 @@ S_open_script(pTHX_ const char *scriptname, bool dosearch, bool *suidscript)
         UV uv;
 	/* if find_script() returns, it returns a malloc()-ed value */
 	scriptname = PL_origfilename = find_script(scriptname, dosearch, NULL, 1);
+        s = scriptname + strlen(scriptname);
 
 	if (strBEGINs(scriptname, "/dev/fd/")
             && isDIGIT(scriptname[8])