45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
/*
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FUNCTION
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<<isalnum_l>>---alphanumeric character predicate
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INDEX
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isalnum_l
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ANSI_SYNOPSIS
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#include <ctype.h>
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int isalnum_l(int <[c]>, locale_t <[locale]>);
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DESCRIPTION
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<<isalnum_l>> is a macro which classifies ASCII integer values by table
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lookup in locale <[locale]>. It is a predicate returning non-zero for
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alphabetic or numeric ASCII characters, and <<0>> for other arguments.
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It is defined only if <[c]> is representable as an unsigned char or if
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<[c]> is EOF.
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if <[locale]> is LC_GLOBAL_LOCALE or not a valid locale object, the behaviour
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is undefined.
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You can use a compiled subroutine instead of the macro definition by
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undefining the macro using `<<#undef isalnum_l>>'.
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RETURNS
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<<isalnum>_l> returns non-zero if <[c]> is a letter (<<a>>--<<z>> or
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<<A>>--<<Z>>) or a digit (<<0>>--<<9>>).
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PORTABILITY
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<<isalnum_l>> is POSIX-1.2008.
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No 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 isalnum_l
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int
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isalnum_l (int c, struct __locale_t *locale)
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{
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return __locale_ctype_ptr_l (locale)[c+1] & (_U|_L|_N);
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}
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