wcsnlen(3)

1wcsnlen(3)                 Library Functions Manual                 wcsnlen(3)
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NAME

6       wcsnlen - determine the length of a fixed-size wide-character string
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <wchar.h>
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14       size_t wcsnlen(const wchar_t s[.maxlen], size_t maxlen);
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16   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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18       wcsnlen():
19           Since glibc 2.10:
20               _POSIX_C_SOURCE >= 200809L
21           Before glibc 2.10:
22               _GNU_SOURCE
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DESCRIPTION

25       The   wcsnlen()  function  is  the  wide-character  equivalent  of  the
26       strnlen(3) function.  It returns the number of wide-characters  in  the
27       string pointed to by s, not including the terminating null wide charac‐
28       ter (L'\0'), but at most maxlen wide characters (note:  this  parameter
29       is not a byte count).  In doing this, wcsnlen() looks at only the first
30       maxlen wide characters at s and never beyond s[maxlen-1].
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RETURN VALUE

33       The wcsnlen() function returns wcslen(s), if that is less than  maxlen,
34       or  maxlen  if  there  is no null wide character among the first maxlen
35       wide characters pointed to by s.
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ATTRIBUTES

38       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
39       tributes(7).
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41       ┌────────────────────────────────────────────┬───────────────┬─────────┐
42       │Interface                                   │ Attribute     │ Value   │
43       ├────────────────────────────────────────────┼───────────────┼─────────┤
44       │wcsnlen()                                   │ Thread safety │ MT-Safe │
45       └────────────────────────────────────────────┴───────────────┴─────────┘
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STANDARDS

48       POSIX.1-2008.
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HISTORY

51       glibc 2.1.
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