Last change
on this file since 444 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 | <<isalpha>>, <<isalpha_l>>---alphabetic character predicate |
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| 4 | |
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| 5 | INDEX |
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| 6 | isalpha |
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| 7 | |
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| 8 | INDEX |
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| 9 | isalpha_l |
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| 10 | |
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| 11 | SYNOPSIS |
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| 12 | #include <ctype.h> |
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| 13 | int isalpha(int <[c]>); |
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| 14 | |
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| 15 | #include <ctype.h> |
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| 16 | int isalpha_l(int <[c]>, locale_t <[locale]>); |
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| 17 | |
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| 18 | DESCRIPTION |
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| 19 | <<isalpha>> is a macro which classifies singlebyte charset values by table |
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| 20 | lookup. It is a predicate returning non-zero when <[c]> represents an |
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| 21 | alphabetic ASCII character, and 0 otherwise. It is defined only if |
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| 22 | <[c]> is representable as an unsigned char or if <[c]> is EOF. |
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| 23 | |
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| 24 | <<isalpha_l>> is like <<isalpha>> 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 isalpha>>' or `<<#undef isalpha_l>>'. |
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| 30 | |
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| 31 | RETURNS |
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| 32 | <<isalpha>>, <<isalpha_l>> return non-zero if <[c]> is a letter. |
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| 33 | |
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| 34 | PORTABILITY |
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| 35 | <<isalpha>> is ANSI C. |
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| 36 | <<isalpha_l>> is POSIX-1.2008. |
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| 37 | |
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| 38 | No supporting 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 isalpha |
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| 45 | int |
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| 46 | isalpha (int c) |
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| 47 | { |
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| 48 | return(__CTYPE_PTR[c+1] & (_U|_L)); |
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| 49 | } |
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