strnlen(3) - Linux man page
Name
strnlen - determine the length of a fixed-size string
Synopsis
#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:
- _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
- Before glibc 2.10:
- _GNU_SOURCE
- _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
Description
The strnlen() function returns the number of bytes in the string pointed to by s, excluding the terminating null bye ('\0'), but at most maxlen. In doing this, strnlen() looks only at the first maxlen bytes at s and never beyond s+maxlen.
Return Value
The strnlen() function returns strlen(s), if that is less than maxlen, or maxlen if there is no null byte ('\0') among the first maxlen bytes pointed to by s.
Conforming To
POSIX.1-2008.
See Also
strlen(3)
