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

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

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

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

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

CONFORMING TO
       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
       strncpy(3), wcpncpy(3)

GNU                                                                            2021-03-22                                                                     STPNCPY(3)