Linux 2.6 - man page for strncpy (linux section 3posix)
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STRNCPY(P) POSIX Programmer's Manual STRNCPY(P)
strncpy - copy part of a string
char *strncpy(char *restrict s1, const char *restrict s2, size_t n);
The strncpy() function shall copy not more than n bytes (bytes that follow a null byte are
not copied) from the array pointed to by s2 to the array pointed to by s1. If copying
takes place between objects that overlap, the behavior is undefined.
If the array pointed to by s2 is a string that is shorter than n bytes, null bytes shall
be appended to the copy in the array pointed to by s1, until n bytes in all are written.
The strncpy() function shall return s1; no return value is reserved to indicate an error.
No errors are defined.
The following sections are informative.
Character movement is performed differently in different implementations. Thus, overlap-
ping moves may yield surprises.
If there is no null byte in the first n bytes of the array pointed to by s2, the result is
strcpy() , the Base Definitions volume of IEEE Std 1003.1-2001, <string.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and The Open Group
Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 STRNCPY(P)
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