транслитерировать строчные буквы в прописные (transliterate lowercase characters to uppercase)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
toupper, toupper_l — transliterate lowercase characters to
uppercase
Синопсис (Synopsis)
#include <ctype.h>
int toupper(int c);
int toupper_l(int c, locale_t locale);
Описание (Description)
For toupper(): The functionality described on this reference page
is aligned with the ISO C standard. Any conflict between the
requirements described here and the ISO C standard is
unintentional. This volume of POSIX.1‐2017 defers to the ISO C
standard.
The toupper() and toupper_l() functions have as a domain a type
int, the value of which is representable as an unsigned char or
the value of EOF. If the argument has any other value, the
behavior is undefined.
If the argument of toupper() or toupper_l() represents a
lowercase letter, and there exists a corresponding uppercase
letter as defined by character type information in the current
locale or in the locale represented by locale, respectively
(category LC_CTYPE), the result shall be the corresponding
uppercase letter.
All other arguments in the domain are returned unchanged.
The behavior is undefined if the locale argument to toupper_l()
is the special locale object LC_GLOBAL_LOCALE or is not a valid
locale object handle.
Возвращаемое значение (Return value)
Upon successful completion, toupper() and toupper_l() shall
return the uppercase letter corresponding to the argument passed;
otherwise, they shall return the argument unchanged.
Ошибки (Error)
No errors are defined.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
setlocale(3p), uselocale(3p)
The Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale,
ctype.h(0p), locale.h(0p)
