STRNLENSection: Linux Programmer's Manual (3)
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NAMEstrnlen - determine the length of a fixed-size string
#define _GNU_SOURCE #include <string.h> size_t strnlen(const char *s, size_t maxlen);
DESCRIPTIONThe strnlen() function returns the number of characters in the string pointed to by s, not including the terminating '\0' character, but at most maxlen. In doing this, strnlen() looks only at the first maxlen characters at s and never beyond s+maxlen.
RETURN VALUEThe strnlen() function returns strlen(s), if that is less than maxlen, or maxlen if there is no '\0' character among the first maxlen characters pointed to by s.
CONFORMING TOThis function is a GNU extension.
SEE ALSOstrlen(3), feature_test_macros(7)
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.