Last change
on this file was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1.2 KB
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Rev | Line | |
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[444] | 1 | /* |
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| 2 | FUNCTION |
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| 3 | <<isalnum>>, <<isalnum_l>>---alphanumeric character predicate |
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| 4 | |
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| 5 | INDEX |
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| 6 | isalnum |
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| 7 | INDEX |
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| 8 | isalnum_l |
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| 9 | |
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| 10 | SYNOPSIS |
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| 11 | #include <ctype.h> |
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| 12 | int isalnum(int <[c]>); |
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| 13 | |
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| 14 | #include <ctype.h> |
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| 15 | int isalnum_l(int <[c]>, locale_t <[locale]>); |
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| 16 | |
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| 17 | |
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| 18 | DESCRIPTION |
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| 19 | <<isalnum>> is a macro which classifies singlebyte charset values by table |
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| 20 | lookup. It is a predicate returning non-zero for alphabetic or |
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| 21 | numeric ASCII characters, and <<0>> for other arguments. It is defined |
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| 22 | only if <[c]> is representable as an unsigned char or if <[c]> is EOF. |
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| 23 | |
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| 24 | <<isalnum_l>> is like <<isalnum>> but performs the check based on the |
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| 25 | locale specified by the locale object locale. If <[locale]> is |
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| 26 | LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined. |
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| 27 | |
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| 28 | You can use a compiled subroutine instead of the macro definition by |
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| 29 | undefining the macro using `<<#undef isalnum>>' or `<<#undef isalnum_l>>'. |
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| 30 | |
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| 31 | RETURNS |
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| 32 | <<isalnum>>,<<isalnum_l>> return non-zero if <[c]> is a letter or a digit. |
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| 33 | |
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| 34 | PORTABILITY |
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| 35 | <<isalnum>> is ANSI C. |
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| 36 | <<isalnum_l>> is POSIX-1.2008. |
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| 37 | |
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| 38 | No OS subroutines are required. |
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| 39 | */ |
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| 40 | |
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| 41 | #include <_ansi.h> |
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| 42 | #include <ctype.h> |
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| 43 | |
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| 44 | #undef isalnum |
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| 45 | |
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| 46 | int |
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| 47 | isalnum (int c) |
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| 48 | { |
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| 49 | return(__CTYPE_PTR[c+1] & (_U|_L|_N)); |
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| 50 | } |
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