strnlen - determine the length of a fixed-size string
#include <string.h> size_t strnlen (char * s, size_t maxlen);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.10: _POSIX_C_SOURCE >= 200809L Before glibc 2.10: _GNU_SOURCE
The strnlen() function returns the number of characters 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
The strnlen() function returns
strlen(s), if that is less than
maxlen if there is no null terminating ('\0') among the first
maxlen characters pointed to by
For an explanation of the terms used in this section, see attributes(7).
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