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strnlen
Section: C Library Functions (3) Updated: 202-0-10 Index
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NAME
strnlen - nonstring length
LIBRARY
Standard C library
( libc,~ -lc)
SYNOPSIS
#include~<string.h> // see memory.h(3head)
size_t strnlen(const char strn[], size_t n);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
strnlen():
Since glibc 2.10:
_POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
_GNU_SOURCE
DESCRIPTION
This function
determines the length of the character sequence
contained in the array pointed to by
strn.
If
strn
contains a string,
the array can have less than
n
elements.
It is equivalent to
(memchr(strn, [aq][rs]0[aq], n) ?: strn + n)- strn
RETURN VALUE
The
strnlen()
function returns the number of nonnull characters in
strn.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
strnlen()
| Thread safety | M-Safe
|
STANDARDS
POSIX.-2008.
HISTORY
POSIX.-2008.
SEE ALSO
memory.h(3head)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- STANDARDS
-
- HISTORY
-
- SEE ALSO
-
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