/usr/include/diet/wchar.h is in dietlibc-dev 0.33~cvs20120325-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | #ifndef _WCHAR_H
#define _WCHAR_H
#include <sys/cdefs.h>
#include <stddef.h>
#include <stdarg.h>
#include <stdio.h>
__BEGIN_DECLS
#if defined(__WINT_TYPE__)
typedef __WINT_TYPE__ wint_t;
#else
typedef unsigned int wint_t;
#endif
typedef int (*wctype_t)(wint_t) __THROW __attribute__((__const__));
#ifndef WCHAR_MIN
#define WCHAR_MIN (-2147483647 - 1)
#define WCHAR_MAX (2147483647)
#endif
#ifndef WEOF
#define WEOF 0xffffffffu
#endif
struct tm;
typedef struct {
int count;
wchar_t sofar;
} mbstate_t;
wint_t btowc(int);
wint_t fgetwc(FILE *);
wchar_t* fgetws(wchar_t *__restrict__, int, FILE *__restrict__);
wint_t fputwc(wchar_t, FILE *);
int fputws(const wchar_t *__restrict__, FILE *__restrict__);
int fwide(FILE *, int);
int fwprintf(FILE *__restrict__, const wchar_t *__restrict__, ...);
int fwscanf(FILE *__restrict__, const wchar_t *__restrict__, ...);
wint_t getwc(FILE *);
wint_t getwchar(void);
size_t mbrlen(const char *__restrict__, size_t, mbstate_t *__restrict__);
size_t mbrtowc(wchar_t *__restrict__, const char *__restrict__, size_t, mbstate_t *__restrict__);
int mbsinit(const mbstate_t *);
size_t mbsrtowcs(wchar_t *__restrict__, const char **__restrict__, size_t, mbstate_t *__restrict__);
wint_t putwc(wchar_t, FILE *);
wint_t putwchar(wchar_t);
int swprintf(wchar_t *__restrict__, size_t, const wchar_t *__restrict__, ...);
int swscanf(const wchar_t *__restrict__, const wchar_t *__restrict__, ...);
wint_t ungetwc(wint_t, FILE *);
int vfwprintf(FILE *__restrict__, const wchar_t *__restrict__, va_list);
int vfwscanf(FILE *__restrict__, const wchar_t *__restrict__, va_list);
int vwprintf(const wchar_t *__restrict__, va_list);
int vswprintf(wchar_t *__restrict__, size_t, const wchar_t *__restrict__, va_list);
int vswscanf(const wchar_t *__restrict__, const wchar_t *__restrict__, va_list);
int vwscanf(const wchar_t *__restrict__, va_list);
size_t wcrtomb(char *__restrict__, wchar_t, mbstate_t *__restrict__);
wchar_t *wcscat(wchar_t *__restrict__, const wchar_t *__restrict__);
wchar_t *wcschr(const wchar_t *, wchar_t);
int wcscmp(const wchar_t *, const wchar_t *);
int wcscoll(const wchar_t *, const wchar_t *);
wchar_t* wcscpy(wchar_t *__restrict__, const wchar_t *__restrict__);
size_t wcscspn(const wchar_t *, const wchar_t *);
size_t wcsftime(wchar_t *__restrict__, size_t, const wchar_t *__restrict__, const struct tm *__restrict__);
size_t wcslen(const wchar_t *) __pure;
wchar_t *wcsncat(wchar_t *__restrict__, const wchar_t *__restrict__, size_t);
int wcsncmp(const wchar_t *, const wchar_t *, size_t);
wchar_t *wcsncpy(wchar_t *__restrict__, const wchar_t *__restrict__, size_t);
wchar_t *wcspbrk(const wchar_t *, const wchar_t *);
wchar_t *wcsrchr(const wchar_t *, wchar_t);
size_t wcsrtombs(char *__restrict__, const wchar_t **__restrict__, size_t, mbstate_t *__restrict__);
size_t wcsspn(const wchar_t *, const wchar_t *);
wchar_t *wcsstr(const wchar_t *__restrict__, const wchar_t *__restrict__);
double wcstod(const wchar_t *__restrict__, wchar_t **__restrict__);
float wcstof(const wchar_t *__restrict__, wchar_t **__restrict__);
wchar_t *wcstok(wchar_t *__restrict__, const wchar_t *__restrict__, wchar_t **__restrict__);
long wcstol(const wchar_t *__restrict__, wchar_t **__restrict__, int);
long double wcstold(const wchar_t *__restrict__, wchar_t **__restrict__);
long long wcstoll(const wchar_t *__restrict__, wchar_t **__restrict__, int);
unsigned long wcstoul(const wchar_t *__restrict__, wchar_t **__restrict__, int);
unsigned long long wcstoull(const wchar_t *__restrict__, wchar_t **__restrict__, int);
size_t wcsxfrm(wchar_t *__restrict__, const wchar_t *__restrict__, size_t);
int wctob(wint_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 *__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);
int wprintf(const wchar_t *__restrict__, ...);
int wscanf(const wchar_t *__restrict__, ...);
#ifdef _XOPEN_SOURCE
int wcwidth(wchar_t c);
int wcswidth(const wchar_t *s, size_t n);
#endif
__END_DECLS
#endif
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