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intro(3) -- Introduction to library functions
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This chapter describes all library functions excluding the library functions described in chapter 2, which implement system calls. There are various function groups which can be identified by a letter... |
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isalpha(3) -- character classification routines
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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 charac... |
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isatty(3) -- does this descriptor refer to a terminal
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returns 1 if desc is an open descriptor connected to a terminal and 0 else. |
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isinf(3) -- test for infinity or not-a-number (NaN)
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The isinf() function returns -1 if value represents negative infinity, 1 if value represents positive infinity, and 0 otherwise. The isnan() function returns a non-zero value if value is "not-a-numbe... |
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iswalnum(3) -- test for alphanumeric wide character
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The iswalnum function is the wide-character equivalent of the isalnum function. It tests whether wc is a wide character belonging to the wide character class "alnum". The wide character class "alnu... |
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iswalpha(3) -- test for alphabetic wide character
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The iswalpha function is the wide-character equivalent of the isalpha function. It tests whether wc is a wide character belonging to the wide character class "alpha". The wide character class "alph... |
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iswblank(3) -- test for whitespace wide character
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The iswblank function is the wide-character equivalent of the isblank function. It tests whether wc is a wide character belonging to the wide character class "blank". The wide character class "blan... |
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iswcntrl(3) -- test for control wide character
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The iswcntrl function is the wide-character equivalent of the iscntrl function. It tests whether wc is a wide character belonging to the wide character class "cntrl". The wide character class "cntr... |
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iswctype(3) -- wide character classification
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If wc is a wide character having the character property designated by desc (or in other words: belongs to the character class designated by desc), the iswctype function returns non-zero. Otherwise it ... |
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iswdigit(3) -- test for decimal digit wide character
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The iswdigit function is the wide-character equivalent of the isdigit function. It tests whether wc is a wide character belonging to the wide character class "digit". The wide character class "digi... |
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iswgraph(3) -- test for graphic wide character
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The iswgraph function is the wide-character equivalent of the isgraph function. It tests whether wc is a wide character belonging to the wide character class "graph". The wide character class "grap... |
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iswlower(3) -- test for lowercase wide character
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The iswlower function is the wide-character equivalent of the islower function. It tests whether wc is a wide character belonging to the wide character class "lower". The wide character class "lowe... |
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iswprint(3) -- test for printing wide character
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The iswprint function is the wide-character equivalent of the isprint function. It tests whether wc is a wide character belonging to the wide character class "print". The wide character class "prin... |
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iswpunct(3) -- test for punctuation or symbolic wide character
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The iswpunct function is the wide-character equivalent of the ispunct function. It tests whether wc is a wide character belonging to the wide character class "punct". The wide character class "punc... |
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iswspace(3) -- test for whitespace wide character
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The iswspace function is the wide-character equivalent of the isspace function. It tests whether wc is a wide character belonging to the wide character class "space". The wide character class "spac... |
