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STRNLEN(3) Linux Programmer's Manual STRNLEN(3)
strnlen - determine the length of a fixed-size string
#include <string.h>
size_t strnlen(const char *s, size_t maxlen);
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
The strnlen() function returns the number of bytes in the string
pointed to by s, excluding the terminating null byte ('\0'), but
at most maxlen. In doing this, strnlen() looks only at the first
maxlen characters in the string pointed to by s and never beyond
s[maxlen-1].
The strnlen() function returns strlen(s), if that is less than
maxlen, or maxlen if there is no null terminating ('\0') among
the first maxlen characters pointed to by s.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│strnlen() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
POSIX.1-2008.
strlen(3)
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and the latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2021-03-22 STRNLEN(3)
Pages that refer to this page: strlen(3), wcsnlen(3), signal-safety(7)
Copyright and license for this manual page
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