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    Command:

    isalnum

    
           isascii_l,   isblank_l,  iscntrl_l,  isdigit_l,  isgraph_l,  islower_l,
           isprint_l, ispunct_l,  isspace_l,  isupper_l,  isxdigit_l  -  character
           classification functions
    
    
    

    SYNOPSIS

           #include <ctype.h>
    
           int isalnum(int c);
           int isalpha(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);
    
           int isascii(int c);
           int isblank(int c);
    
           int isalnum_l(int c, locale_t locale);
           int isalpha_l(int c, locale_t locale);
           int isblank_l(int c, locale_t locale);
           int iscntrl_l(int c, locale_t locale);
           int isdigit_l(int c, locale_t locale);
           int isgraph_l(int c, locale_t locale);
           int islower_l(int c, locale_t locale);
           int isprint_l(int c, locale_t locale);
           int ispunct_l(int c, locale_t locale);
           int isspace_l(int c, locale_t locale);
           int isupper_l(int c, locale_t locale);
           int isxdigit_l(int c, locale_t locale);
    
           int isascii_l(int c, locale_t locale);
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           isascii():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE
    
           isblank():
               _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
               _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
           isalnum_l(), isalpha_l(), isblank_l(), iscntrl_l(), isdigit_l(),
           isgraph_l(), islower_l(), isprint_l(), ispunct_l(), isspace_l(), isup-
           per_l(), isxdigit_l():
               Since glibc 2.10:
                      _XOPEN_SOURCE >= 700
    
           The  functions  with  the  "_l"  suffix  perform the check based on the
           locale specified by the locale object locale.  The  behavior  of  these
           functions   is  undefined  if  locale  is  the  special  locale  object
           LC_GLOBAL_LOCALE (see duplocale(3)) or is not  a  valid  locale  object
           handle.
    
           The list below explains the operation of the functions without the "_l"
           suffix; the functions with the "_l" suffix differ  only  in  using  the
           locale object locale instead of the current locale.
    
           isalnum()
                  checks for an alphanumeric character; it is equivalent to (isal-
                  pha(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 uppercase nor lowercase.
    
           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 lowercase 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.   In  the  "C" and "POSIX"
                  locales, these are: space,  form-feed  ('\f'),  newline  ('\n'),
                  carriage  return ('\r'), horizontal tab ('\t'), and vertical tab
                  ('\v').
    
           The  isalnum(),  isalpha(), isascii(), isblank(), iscntrl(), isdigit(),
           isgraph(), islower(), isprint(), ispunct(), isspace(),  isupper(),  and
           isxdigit() functions are thread-safe.
    
    
    

    VERSIONS

           isalnum_l(),   isalpha_l(),   isblank_l(),   iscntrl_l(),  isdigit_l(),
           isgraph_l(), islower_l(), isprint_l(), ispunct_l(), isspace_l(),  isup-
           per_l(), isxdigit_l(), and isascii_l() are available since glibc 2.3.
    
    
    

    CONFORMING TO

           C89  specifies  isalnum(),  isalpha(), iscntrl(), isdigit(), isgraph(),
           islower(), isprint(), ispunct(), isspace(), isupper(), and  isxdigit(),
           but  not  isascii()  and  isblank().  POSIX.1-2001 also specifies those
           functions, and also isascii() (as an XSI extension) and isblank().  C99
           specifies all of the preceding functions, except isascii().
    
           POSIX.1-2008 marks isascii() as obsolete, noting that it cannot be used
           portably in a localized application.
    
           POSIX.-1-2008 specifies isalnum_l(),  isalpha_l(),  isblank_l(),  iscn-
           trl_l(),    isdigit_l(),    isgraph_l(),    islower_l(),   isprint_l(),
           ispunct_l(), isspace_l(), isupper_l(), and isxdigit_l().
    
           isascii_l() is a GNU extension.
    
    
    

    NOTES

           The details of what characters belong to  which  class  depend  on  the
           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),  isw-
           graph(3),  iswlower(3),  iswprint(3),  iswpunct(3), iswspace(3), iswup-
           per(3),   iswxdigit(3),   newlocale(3),   setlocale(3),   uselocale(3),
           toascii(3), tolower(3), toupper(3), ascii(7), locale(7)
    
    
    

    GNU 2014-03-18 ISALPHA(3)

    
    
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