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
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File size:
1.2 KB
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Line | |
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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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