use restrict everywhere it's required by c99 and/or posix 2008

to deal with the fact that the public headers may be used with pre-c99
compilers, __restrict is used in place of restrict, and defined
appropriately for any supported compiler. we also avoid the form
[restrict] since older versions of gcc rejected it due to a bug in the
original c99 standard, and instead use the form *restrict.

include/wchar.h

@@ -5,6 +5,12 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+#define __restrict restrict
+#elif !defined(__GNUC__)
+#define __restrict
+#endif
+
 #define __NEED_FILE
 #define __NEED_va_list
 #define __NEED_size_t
@@ -39,17 +45,17 @@ typedef struct
 	unsigned __opaque1, __opaque2;
 } mbstate_t;
 
-wchar_t *wcscpy (wchar_t *, const wchar_t *);
-wchar_t *wcsncpy (wchar_t *, const wchar_t *, size_t);
+wchar_t *wcscpy (wchar_t *__restrict, const wchar_t *__restrict);
+wchar_t *wcsncpy (wchar_t *__restrict, const wchar_t *__restrict, size_t);
 
-wchar_t *wcscat (wchar_t *, const wchar_t *);
-wchar_t *wcsncat (wchar_t *, const wchar_t *, size_t);
+wchar_t *wcscat (wchar_t *__restrict, const wchar_t *__restrict);
+wchar_t *wcsncat (wchar_t *__restrict, const wchar_t *__restrict, size_t);
 
 int wcscmp (const wchar_t *, const wchar_t *);
 int wcsncmp (const wchar_t *, const wchar_t *, size_t);
 
 int wcscoll(const wchar_t *, const wchar_t *);
-size_t wcsxfrm (wchar_t *, const wchar_t *, size_t n);
+size_t wcsxfrm (wchar_t *__restrict, const wchar_t *__restrict, size_t n);
 
 wchar_t *wcschr (const wchar_t *, wchar_t);
 wchar_t *wcsrchr (const wchar_t *, wchar_t);
@@ -58,16 +64,16 @@ size_t wcscspn (const wchar_t *, const wchar_t *);
 size_t wcsspn (const wchar_t *, const wchar_t *);
 wchar_t *wcspbrk (const wchar_t *, const wchar_t *);
 
-wchar_t *wcstok (wchar_t *, const wchar_t *, wchar_t **);
+wchar_t *wcstok (wchar_t *__restrict, const wchar_t *__restrict, wchar_t **__restrict);
 
 size_t wcslen (const wchar_t *);
 
-wchar_t *wcsstr (const wchar_t *, const wchar_t *);
+wchar_t *wcsstr (const wchar_t *__restrict, const wchar_t *__restrict);
 wchar_t *wcswcs (const wchar_t *, const wchar_t *);
 
 wchar_t *wmemchr (const wchar_t *, wchar_t, size_t);
 int wmemcmp (const wchar_t *, const wchar_t *, size_t);
-wchar_t *wmemcpy (wchar_t *, const wchar_t *, size_t);
+wchar_t *wmemcpy (wchar_t *__restrict, const wchar_t *__restrict, size_t);
 wchar_t *wmemmove (wchar_t *, const wchar_t *, size_t);
 wchar_t *wmemset (wchar_t *, wchar_t, size_t);
 
@@ -75,44 +81,44 @@ wint_t btowc (int);
 int wctob (wint_t);
 
 int mbsinit (const mbstate_t *);
-size_t mbrtowc (wchar_t *, const char *, size_t, mbstate_t *);
-size_t wcrtomb (char *, wchar_t, mbstate_t *);
+size_t mbrtowc (wchar_t *__restrict, const char *__restrict, size_t, mbstate_t *__restrict);
+size_t wcrtomb (char *__restrict, wchar_t, mbstate_t *__restrict);
 
-size_t mbrlen (const char *, size_t, mbstate_t *);
+size_t mbrlen (const char *__restrict, size_t, mbstate_t *__restrict);
 
-size_t mbsrtowcs (wchar_t *, const char **, size_t, mbstate_t *);
-size_t wcsrtombs (char *, const wchar_t **, size_t, mbstate_t *);
+size_t mbsrtowcs (wchar_t *__restrict, const char **__restrict, size_t, mbstate_t *__restrict);
+size_t wcsrtombs (char *__restrict, const wchar_t **__restrict, size_t, mbstate_t *__restrict);
 
-float wcstof (const wchar_t *, wchar_t **);
-double wcstod (const wchar_t *, wchar_t **);
-long double wcstold (const wchar_t *, wchar_t **);
+float wcstof (const wchar_t *__restrict, wchar_t **__restrict);
+double wcstod (const wchar_t *__restrict, wchar_t **__restrict);
+long double wcstold (const wchar_t *__restrict, wchar_t **__restrict);
 
-long wcstol (const wchar_t *, wchar_t **, int);
-unsigned long wcstoul (const wchar_t *, wchar_t **, int);
+long wcstol (const wchar_t *__restrict, wchar_t **__restrict, int);
+unsigned long wcstoul (const wchar_t *__restrict, wchar_t **__restrict, int);
 
-long long wcstoll (const wchar_t *, wchar_t **, int);
-unsigned long long wcstoull (const wchar_t *, wchar_t **, int);
+long long wcstoll (const wchar_t *__restrict, wchar_t **__restrict, int);
+unsigned long long wcstoull (const wchar_t *__restrict, wchar_t **__restrict, int);
 
 
 
 int fwide (FILE *, int);
 
 
-int wprintf (const wchar_t *, ...);
-int fwprintf (FILE *, const wchar_t *, ...);
-int swprintf (wchar_t *, size_t, const wchar_t *, ...);
+int wprintf (const wchar_t *__restrict, ...);
+int fwprintf (FILE *__restrict, const wchar_t *__restrict, ...);
+int swprintf (wchar_t *__restrict, size_t, const wchar_t *__restrict, ...);
 
-int vwprintf (const wchar_t *, va_list);
-int vfwprintf (FILE *, const wchar_t *, va_list);
-int vswprintf (wchar_t *, size_t, const wchar_t *, va_list);
+int vwprintf (const wchar_t *__restrict, va_list);
+int vfwprintf (FILE *__restrict, const wchar_t *__restrict, va_list);
+int vswprintf (wchar_t *__restrict, size_t, const wchar_t *__restrict, va_list);
 
-int wscanf (const wchar_t *, ...);
-int fwscanf (FILE *, const wchar_t *, ...);
-int swscanf (const wchar_t *, const wchar_t *, ...);
+int wscanf (const wchar_t *__restrict, ...);
+int fwscanf (FILE *__restrict, const wchar_t *__restrict, ...);
+int swscanf (const wchar_t *__restrict, const wchar_t *__restrict, ...);
 
-int vwscanf (const wchar_t *, va_list);
-int vfwscanf (FILE *, const wchar_t *, va_list);
-int vswscanf (const wchar_t *, const wchar_t *, va_list);
+int vwscanf (const wchar_t *__restrict, va_list);
+int vfwscanf (FILE *__restrict, const wchar_t *__restrict, va_list);
+int vswscanf (const wchar_t *__restrict, const wchar_t *__restrict, va_list);
 
 wint_t fgetwc (FILE *);
 wint_t getwc (FILE *);
@@ -122,31 +128,31 @@ wint_t fputwc (wchar_t, FILE *);
 wint_t putwc (wchar_t, FILE *);
 wint_t putwchar (wchar_t);
 
-wchar_t *fgetws (wchar_t *, int, FILE *);
-int fputws (const wchar_t *, FILE *);
+wchar_t *fgetws (wchar_t *__restrict, int, FILE *__restrict);
+int fputws (const wchar_t *__restrict, FILE *__restrict);
 
 wint_t ungetwc (wint_t, FILE *);
 
 struct tm;
-size_t wcsftime (wchar_t *, size_t, const wchar_t *, const struct tm *);
+size_t wcsftime (wchar_t *__restrict, size_t, const wchar_t *__restrict, const struct tm *__restrict);
 
 #undef iswdigit
 
 #if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
  || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
 FILE *open_wmemstream(wchar_t **, size_t *);
-size_t mbsnrtowcs(wchar_t *, const char **, size_t, size_t, mbstate_t *);
-size_t wcsnrtombs(char *, const wchar_t **, size_t, size_t, mbstate_t *);
+size_t mbsnrtowcs(wchar_t *__restrict, const char **__restrict, size_t, size_t, mbstate_t *__restrict);
+size_t wcsnrtombs(char *__restrict, const wchar_t **__restrict, size_t, size_t, mbstate_t *__restrict);
 wchar_t *wcsdup(const wchar_t *);
 size_t wcsnlen (const wchar_t *, size_t);
-wchar_t *wcpcpy (wchar_t *, const wchar_t *);
-wchar_t *wcpncpy (wchar_t *, const wchar_t *, size_t);
+wchar_t *wcpcpy (wchar_t *__restrict, const wchar_t *__restrict);
+wchar_t *wcpncpy (wchar_t *__restrict, const wchar_t *__restrict, size_t);
 int wcscasecmp(const wchar_t *, const wchar_t *);
 int wcscasecmp_l(const wchar_t *, const wchar_t *, locale_t);
 int wcsncasecmp(const wchar_t *, const wchar_t *, size_t);
 int wcsncasecmp_l(const wchar_t *, const wchar_t *, size_t, locale_t);
 int wcscoll_l(const wchar_t *, const wchar_t *, locale_t);
-size_t wcsxfrm_l(wchar_t *, const wchar_t *, size_t n, locale_t);
+size_t wcsxfrm_l(wchar_t *__restrict, const wchar_t *__restrict, size_t n, locale_t);
 #endif
 
 #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)