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Fix compiler warning in the xml module (GH-26245) (GH-26249)

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The newest version of gcc complains about passing un-initialized arrays
as constant pointers:

```
/Modules/expat/xmltok_ns.c: In function ‘findEncodingNS’:
/Modules/expat/xmltok.h:272:10: warning: ‘buf’ may be used uninitialized [-Wmaybe-uninitialized]
  272 |   (((enc)->utf8Convert)(enc, fromP, fromLim, toP, toLim))
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Modules/expat/xmltok_ns.c:95:3: note: in expansion of macro ‘XmlUtf8Convert’
   95 |   XmlUtf8Convert(enc, &ptr, end, &p, p + ENCODING_MAX - 1);
      |   ^~~~~~~~~~~~~~
/Modules/expat/xmltok.h:272:10: note: by argument 5 of type ‘const char *’ to ‘enum XML_Convert_Result(const ENCODING *, const char **, const char *, char **, const char *)’ {aka ‘enum XML_Convert_Result(const struct encoding *, const char **, const char *, char **, const char *)’}
  272 |   (((enc)->utf8Convert)(enc, fromP, fromLim, toP, toLim))
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Modules/expat/xmltok_ns.c:95:3: note: in expansion of macro ‘XmlUtf8Convert’
   95 |   XmlUtf8Convert(enc, &ptr, end, &p, p + ENCODING_MAX - 1);
      |   ^~~~~~~~~~~~~~
In file included from /Modules/expat/xmltok.c:1657:
/Modules/expat/xmltok_ns.c:92:8: note: ‘buf’ declared here
   92 |   char buf[ENCODING_MAX];

```
(cherry picked from commit be93f81e58)

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
This commit is contained in:
Miss Islington (bot) 2021-05-19 11:21:19 -07:00 • committed by GitHub
parent 3357604db9
commit e87fd41d02
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Modules/expat/xmltok_ns.c
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@ -89,7 +89,7 @@ NS(XmlInitEncoding)(INIT_ENCODING *p, const ENCODING **encPtr,
static const ENCODING *
NS(findEncoding)(const ENCODING *enc, const char *ptr, const char *end) {
# define ENCODING_MAX 128
char buf[ENCODING_MAX];
char buf[ENCODING_MAX] = {0};
char *p = buf;
int i;
XmlUtf8Convert(enc, &ptr, end, &p, p + ENCODING_MAX - 1);