Fix for talloc, in order to improve mesa shader compiler performance on windows from abysmal to m...

third_party/talloc/talloc.c

 /* 
    Samba Unix SMB/CIFS implementation.
 
    Samba trivial allocation library - new interface
 
    NOTE: Please read talloc_guide.txt for full documentation
 
    Copyright (C) Andrew Tridgell 2004
    Copyright (C) Stefan Metzmacher 2006
    
@@ skipping 1704 matching lines @@
 #else
 #define va_copy(dest, src) (dest) = (src)
 #endif
 #endif
 
 char *talloc_vasprintf(const void *t, const char *fmt, va_list ap)
 {
         int len;
         char *ret;
         va_list ap2;
-        char c;
 
-        /* this call looks strange, but it makes it work on older solaris boxes */
         va_copy(ap2, ap);
-        len = vsnprintf(&c, 1, fmt, ap2);
+        len = vsnprintf(NULL, 0, fmt, ap2);
         va_end(ap2);
         if (unlikely(len < 0)) {
                 return NULL;
         }
 
         ret = (char *)__talloc(t, len+1);
         if (unlikely(!ret)) return NULL;
 
         va_copy(ap2, ap);
         vsnprintf(ret, len+1, fmt, ap2);
@@ skipping 26 matching lines @@
 static INLINE char *__talloc_vaslenprintf_append(char *s, size_t slen,
                                                  const char *fmt, va_list ap)
 {
         /* ssize_t isn't present on Windows. */
 #ifndef _MSC_VER
         ssize_t alen;
 #else
         size_t alen;
 #endif
         va_list ap2;
-        char c;
 
         va_copy(ap2, ap);
-        alen = vsnprintf(&c, 1, fmt, ap2);
+        alen = vsnprintf(NULL, 0, fmt, ap2);
         va_end(ap2);
 
         if (alen <= 0) {
                 /* Either the vsnprintf failed or the format resulted in
                  * no characters being formatted. In the former case, we
                  * ought to return NULL, in the latter we ought to return
                  * the original string. Most current callers of this
                  * function expect it to never return NULL.
                  */
                 return s;
@@ skipping 223 matching lines @@
         tc = talloc_chunk_from_ptr(context);
         while (tc) {
                 if (TC_PTR_FROM_CHUNK(tc) == ptr) return 1;
                 while (tc && tc->prev) tc = tc->prev;
                 if (tc) {
                         tc = tc->parent;
                 }
         }
         return 0;
 }