NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON 

STRNLEN(3)                Linux Programmer's Manual               STRNLEN(3)

NAME         top

       strnlen - determine the length of a fixed-size string

SYNOPSIS         top

       #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

DESCRIPTION         top

       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 s+maxlen.

RETURN VALUE         top

       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.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌──────────┬───────────────┬─────────┐
       │Interface │ Attribute     │ Value   │
       ├──────────┼───────────────┼─────────┤
       │strnlen() │ Thread safety │ MT-Safe │
       └──────────┴───────────────┴─────────┘

CONFORMING TO         top

       POSIX.1-2008.

SEE ALSO         top

       strlen(3)

COLOPHON         top

       This page is part of release 4.12 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.
GNU                              2016-03-15                       STRNLEN(3)

Pages that refer to this page: strlen(3),  wcsnlen(3),  signal-safety(7)