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 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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