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...
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...
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...
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...
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...
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...
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...
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 ...
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...
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...
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...
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...
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...
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...
