stpncpy(3) — Linux manual page

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

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

NAME         top

       stpncpy - copy a fixed-size string, returning a pointer to its
       end

SYNOPSIS         top

       #include <string.h>

       char *stpncpy(char *restrict dest, const char *restrict src, size_t n);

   Feature Test Macro Requirements for glibc (see
   feature_test_macros(7)):

       stpncpy():
           Since glibc 2.10:
               _POSIX_C_SOURCE >= 200809L
           Before glibc 2.10:
               _GNU_SOURCE

DESCRIPTION         top

       The stpncpy() function copies at most n characters from the
       string pointed to by src, including the terminating null byte
       ('\0'), to the array pointed to by dest.  Exactly n characters
       are written at dest.  If the length strlen(src) is smaller than
       n, the remaining characters in the array pointed to by dest are
       filled with null bytes ('\0'), If the length strlen(src) is
       greater than or equal to n, the string pointed to by dest will
       not be null-terminated.

       The strings may not overlap.

       The programmer must ensure that there is room for at least n
       characters at dest.

RETURN VALUE         top

       stpncpy() returns a pointer to the terminating null byte in dest,
       or, if dest is not null-terminated, dest+n.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).

       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │Interface                             Attribute     Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │stpncpy()                             │ Thread safety │ MT-Safe │
       └──────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO         top

       This function was added to POSIX.1-2008.  Before that, it was a
       GNU extension.  It first appeared in version 1.07 of the GNU C
       library in 1993.

SEE ALSO         top

       strncpy(3), wcpncpy(3)

COLOPHON         top

       This page is part of release 5.11 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                            2021-03-22                     STPNCPY(3)

Pages that refer to this page: stpcpy(3)strcpy(3)wcpncpy(3)signal-safety(7)