stpncpy(3) — Linux manual page


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 *dest, const char *src, size_t n);

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

           Since glibc 2.10:
               _POSIX_C_SOURCE >= 200809L
           Before glibc 2.10:

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

       │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

SEE ALSO         top

       strncpy(3), wcpncpy(3)

COLOPHON         top

       This page is part of release 5.09 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

GNU                              2019-03-06                       STPNCPY(3)

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