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Интерактивная система просмотра системных руководств (man-ов)

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isascii (3)
  • isascii (3) ( FreeBSD man: Библиотечные вызовы )
  • isascii (3) ( Русские man: Библиотечные вызовы )
  • >> isascii (3) ( Linux man: Библиотечные вызовы )
  • isascii (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    isalnum, isalpha, isascii, isblank, iscntrl, isdigit, isgraph, islower,
    isprint, ispunct, isspace, isupper, isxdigit - character
    classification routines
     
    

    SYNOPSIS

    #include <ctype.h>
    
    int isalnum(int c);
    
    int isalpha(int c);
    int isascii(int c);
    int isblank(int c);
    int iscntrl(int c);
    int isdigit(int c);
    int isgraph(int c);
    int islower(int c);
    int isprint(int c);
    int ispunct(int c);
    int isspace(int c);
    int isupper(int c);
    int isxdigit(int c);

    Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

    isascii(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE
    isblank(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99  

    DESCRIPTION

    These functions check whether c, which must have the value of an unsigned char or EOF, falls into a certain character class according to the current locale.
    isalnum()
    checks for an alphanumeric character; it is equivalent to (isalpha(c) || isdigit(c)).
    isalpha()
    checks for an alphabetic character; in the standard "C" locale, it is equivalent to (isupper(c) || islower(c)). In some locales, there may be additional characters for which isalpha() is true---letters which are neither upper case nor lower case.
    isascii()
    checks whether c is a 7-bit unsigned char value that fits into the ASCII character set.
    isblank()
    checks for a blank character; that is, a space or a tab.
    iscntrl()
    checks for a control character.
    isdigit()
    checks for a digit (0 through 9).
    isgraph()
    checks for any printable character except space.
    islower()
    checks for a lower-case character.
    isprint()
    checks for any printable character including space.
    ispunct()
    checks for any printable character which is not a space or an alphanumeric character.
    isspace()
    checks for white-space characters.    #include <the>
    C and POSIX locales, these are: space, form-feed (aq\faq), newline (aq\naq), carriage return (aq\raq), horizontal tab (aq\taq), and vertical tab (aq\vaq).
    isupper()
    checks for an uppercase letter.
    isxdigit()
    checks for a hexadecimal digits, that is, one of
    0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F.
     

    RETURN VALUE

    The values returned are non-zero if the character c falls into the tested class, and a zero value if not.  

    CONFORMING TO

    C99, 4.3BSD. C89 specifies all of these functions except isascii() and isblank(). isascii() is a BSD extension and is also an SVr4 extension. isblank() conforms to POSIX.1-2001 and C99 7.4.1.3. POSIX.1-2008 marks isalpa() as obsolete.  

    NOTES

    The details of what characters belong into which class depend on the current locale. For example, isupper() will not recognize an A-umlaut (:A) as an uppercase letter in the default C locale.  

    SEE ALSO

    iswalnum(3), iswalpha(3), iswblank(3), iswcntrl(3), iswdigit(3), iswgraph(3), iswlower(3), iswprint(3), iswpunct(3), iswspace(3), iswupper(3), iswxdigit(3), setlocale(3), tolower(3), toupper(3), ascii(7), locale(7)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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