cwchar
Standard library header <cwchar>
This header was originally in the C standard library as <wchar.h>.
This header is part of the null-terminated wide and multibyte strings libraries. It also provides some C-style I/O functions and conversion from C-style Date.
Macros
| NULL | implementation-defined null pointer constant (macro constant) |
|---|---|
| WEOF | a non-character value of type wint_t used to indicate errors (macro constant) |
| WCHAR_MIN | the smallest valid value of wchar_t (macro constant) |
| WCHAR_MAX | the largest valid value of wchar_t (macro constant) |
Types
| mbstate_t | conversion state information necessary to iterate multibyte character strings (class) |
|---|---|
| size_t | unsigned integer type returned by the sizeof operator (typedef) |
| wint_t | integer type that can hold any valid wide character and at least one more value |
| tm | calendar time type (class) |
Functions
| String manipulation |
|:----|
| wcscpy | copies one wide string to another (function) |
| wcsncpy | copies a certain amount of wide characters from one string to another (function) |
| wcscat | appends a copy of one wide string to another (function) |
| wcsncat | appends a certain amount of wide characters from one wide string to another (function) |
| wcsxfrm | transform a wide string so that wcscmp would produce the same result as wcscoll (function) |
| String examination |
| wcslen | returns the length of a wide string (function) |
| wcscmp | compares two wide strings (function) |
| wcsncmp | compares a certain amount of characters from two wide strings (function) |
| wcscoll | compares two wide strings in accordance to the current locale (function) |
| wcschr | finds the first occurrence of a wide character in a wide string (function) |
| wcsrchr | finds the last occurrence of a wide character in a wide string (function) |
| wcsspn | returns the length of the maximum initial segment that consists of only the wide characters found in another wide string (function) |
| wcscspn | returns the length of the maximum initial segment that consists of only the wide not found in another wide string (function) |
| wcspbrk | finds the first location of any wide character in one wide string, in another wide string (function) |
| wcsstr | finds the first occurrence of a wide string within another wide string (function) |
| wcstok | finds the next token in a wide string (function) |
| Wide character array manipulation |
| wmemcpy | copies a certain amount of wide characters between two non-overlapping arrays (function) |
| wmemmove | copies a certain amount of wide characters between two, possibly overlapping, arrays (function) |
| wmemcmp | compares a certain amount of wide characters from two arrays (function) |
| wmemchr | finds the first occurrence of a wide character in a wide character array (function) |
| wmemset | copies the given wide character to every position in a wide character array (function) |
| Multibyte/wide character conversion |
| mbsinit | checks if the mbstate_t object represents initial shift state (function) |
| btowc | widens a single-byte narrow character to wide character, if possible (function) |
| wctob | narrows a wide character to a single-byte narrow character, if possible (function) |
| mbrlen | returns the number of bytes in the next multibyte character, given state (function) |
| mbrtowc | converts the next multibyte character to wide character, given state (function) |
| wcrtomb | converts a wide character to its multibyte representation, given state (function) |
| mbsrtowcs | converts a narrow multibyte character string to wide string, given state (function) |
| wcsrtombs | converts a wide string to narrow multibyte character string, given state (function) |
| Input/Output |
| fgetwcgetwc | gets a wide character from a file stream (function) |
| fgetws | gets a wide string from a file stream (function) |
| fputwcputwc | writes a wide character to a file stream (function) |
| fputws | writes a wide string to a file stream (function) |
| getwchar | reads a wide character from stdin (function) |
| putwchar | writes a wide character to stdout (function) |
| ungetwc | puts a wide character back into a file stream (function) |
| fwide | switches a file stream between wide character I/O and narrow character I/O (function) |
| wscanffwscanfswscanf | reads formatted wide character input from stdin, a file stream or a buffer (function) |
| vwscanfvfwscanfvswscanf (C++11)(C++11)(C++11) | reads formatted wide character input from stdin, a file stream or a buffer using variable argument list (function) |
| wprintffwprintfswprintf | prints formatted wide character output to stdout, a file stream or a buffer (function) |
| vwprintfvfwprintfvswprintf | prints formatted wide character output to stdout, a file stream or a buffer using variable argument list (function) |
| String conversions |
| wcsftime | converts a tm object to custom wide string textual representation (function) |
| wcstolwcstoll | converts a wide string to an integer value (function) |
| wcstoulwcstoull | converts a wide string to an unsigned integer value (function) |
| wcstofwcstodwcstold | converts a wide string to a floating point value (function) |
Notes
NULLis also defined in the following headers:
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