Last change
on this file since 577 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:
744 bytes
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Line | |
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1 | /* |
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2 | FUNCTION |
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3 | <<strnlen>>---character string length |
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4 | |
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5 | INDEX |
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6 | strnlen |
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7 | |
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8 | SYNOPSIS |
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9 | #include <string.h> |
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10 | size_t strnlen(const char *<[str]>, size_t <[n]>); |
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11 | |
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12 | DESCRIPTION |
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13 | The <<strnlen>> function works out the length of the string |
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14 | starting at <<*<[str]>>> by counting chararacters until it |
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15 | reaches a NUL character or the maximum: <[n]> number of |
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16 | characters have been inspected. |
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17 | |
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18 | RETURNS |
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19 | <<strnlen>> returns the character count or <[n]>. |
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20 | |
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21 | PORTABILITY |
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22 | <<strnlen>> is a GNU extension. |
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23 | |
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24 | <<strnlen>> requires no supporting OS subroutines. |
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25 | |
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26 | */ |
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27 | |
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28 | #undef __STRICT_ANSI__ |
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29 | #include <_ansi.h> |
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30 | #include <string.h> |
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31 | |
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32 | size_t |
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33 | strnlen (const char *str, |
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34 | size_t n) |
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35 | { |
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36 | const char *start = str; |
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37 | |
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38 | while (n-- > 0 && *str) |
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39 | str++; |
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40 | |
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41 | return str - start; |
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42 | } |
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