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:
744 bytes
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Rev | Line | |
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[444] | 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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