stpncpy - copy a fixed-size string, returning a pointer to its end
#include <string.h>
char *stpncpy(char *dest, const char *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
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.
stpncpy() returns a pointer to the terminating null byte in
dest,
or, if
dest is not null-terminated,
dest+
n.
For an explanation of the terms used in this section, see
attributes(7).
| Interface |
Attribute |
Value |
| stpncpy () |
Thread safety |
MT-Safe |
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.
strncpy(3),
wcpncpy(3)