49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
/*
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FUNCTION
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<<isblank>>, <<isblank_l>>---blank character predicate
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INDEX
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isblank
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INDEX
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isblank_l
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SYNOPSIS
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#include <ctype.h>
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int isblank(int <[c]>);
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#include <ctype.h>
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int isblank_l(int <[c]>, locale_t <[locale]>);
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DESCRIPTION
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<<isblank>> is a function which classifies singlebyte charset values by table
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lookup. It is a predicate returning non-zero for blank characters, and 0
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for other characters. It is defined only if <[c]> is representable as an
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unsigned char or if <[c]> is EOF.
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<<isblank_l>> is like <<isblank>> but performs the check based on the
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locale specified by the locale object locale. If <[locale]> is
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LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
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RETURNS
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<<isblank>>, <<isblank_l>> return non-zero if <[c]> is a blank character.
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PORTABILITY
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<<isblank>> is C99.
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<<isblank_l>> is POSIX-1.2008.
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No supporting OS subroutines are required.
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*/
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#include <_ansi.h>
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#include <ctype.h>
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#undef isblank
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int
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isblank (int c)
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{
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return ((__CTYPE_PTR[c+1] & _B) || (c == '\t'));
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}
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