version 1, including all changes.
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perry |
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ISALPHA |
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!!!ISALPHA |
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NAME |
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SYNOPSIS |
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DESCRIPTION |
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RETURN VALUE |
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CONFORMING TO |
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NOTE |
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SEE ALSO |
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---- |
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!!NAME |
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isalnum, isalpha, isascii, isblank, iscntrl, isdigit, isgraph, islower, isprint, ispunct, isspace, isupper, isxdigit - character classification routines |
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!!SYNOPSIS |
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__#include |
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__ ''c''__); |
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int isalpha (int__ ''c''__); |
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int isascii (int__ ''c''__); |
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int isblank (int__ ''c''__); |
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int iscntrl (int__ ''c''__); |
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int isdigit (int__ ''c''__); |
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int isgraph (int__ ''c''__); |
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int islower (int__ ''c''__); |
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int isprint (int__ ''c''__); |
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int ispunct (int__ ''c''__); |
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int isspace (int__ ''c''__); |
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int isupper (int__ ''c''__); |
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int isxdigit (int__ ''c''__); |
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__ |
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!!DESCRIPTION |
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These functions check whether ''c'', which must have the |
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value of an __unsigned char__ or __EOF__, falls into a |
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certain character class according to the current |
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locale. |
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__isalnum()__ |
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checks for an alphanumeric character; it is equivalent to |
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__(isalpha(__''c''__) || |
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isdigit(__''c''__))__. |
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__isalpha()__ |
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checks for an alphabetic character; in the standard |
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____ locale, it is equivalent to |
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__(isupper(__''c''__) || |
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islower(__''c''__))__. In some locales, there may be |
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additional characters for which __isalpha()__ is |
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true--letters which are neither upper case nor lower |
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case. |
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__isascii()__ |
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checks whether ''c'' is a 7-bit ''unsigned char'' |
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value that fits into the ASCII character set. This function |
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is a BSD extension and is also an SVID |
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extension. |
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__isblank()__ |
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checks for a blank character; that is, a space or a tab. |
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This function is a GNU extension. |
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__iscntrl()__ |
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checks for a control character. |
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__isdigit()__ |
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checks for a digit (0 through 9). |
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__isgraph()__ |
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checks for any printable character except |
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space. |
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__islower()__ |
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checks for a lower-case character. |
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__isprint()__ |
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checks for any printable character including |
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space. |
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__ispunct()__ |
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checks for any printable character which is not a space or |
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an alphanumeric character. |
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__isspace()__ |
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checks for white-space characters. In the |
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____ and ____ locales, |
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these are: space, form-feed (__'f'__), newline |
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(__'n'__), carriage return (__'r'__), horizontal tab |
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(__'t'__), and vertical tab (__'v'__). |
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__isupper()__ |
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checks for an uppercase letter. |
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__isxdigit()__ |
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checks for a hexadecimal digits, i.e. one of __0 1 2 3 4 5 |
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6 7 8 9 a b c d e f A B C D E F__. |
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!!RETURN VALUE |
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The values returned are nonzero if the character ''c'' |
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falls into the tested class, and a zero value if |
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not. |
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!!CONFORMING TO |
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ANSI - C, BSD 4.3. __isascii()__ is a BSD extension and |
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is also an SVID extension. __isblank()__ is a GNU |
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extension. |
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!!NOTE |
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The details of what characters belong into which class |
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depend on the current locale. For example, __isupper()__ |
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will not recognize an A - umlaut as an uppercase letter in |
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the default __C__ locale. |
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!!SEE ALSO |
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tolower(3), toupper(3), setlocale(3), |
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ascii(7), locale(7) |
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---- |